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[luatex.git] / source / texk / web2c / luatexdir / NEWS

This file is in the public domain.

==============================================================
Luatex Release 0.89.0 was released 2016020500 
==============================================================

No fundamental changes, just some fixes / improvements (and of course new bugglets).

- New backend things:
 \pdfvariable pkfixeddpi = integer % > 0 : use only default dpi (so one can do with one high res instance)
 \pdfvariable ignoreunknownimages = integer % > 0 : ignore missing and inject something empty (to be used with care)
  and one can do this:
 \edef\foo{\pdfvariable foo}
 \def \oof{foo}
 \ifx\foo\oof don't fool me\fi
 (side effect of no longer aborting on missing, so one implement a catch)




==============================================================
Luatex Release 0.88.0 was released 2016011500 
==============================================================

This is a next step upto 0.90 and it has the following changes:

- mostly small bug fixes 

- a few setters/getters added to the pdf namespace (were in the tex one before)

- The current libraries under libs are now:
  * poppler-0.40.0
  * mpfr-3.1.3
  * luajit-2.1.0-beta1
  * gmp-6.1.0
  * zziplib-0.13.62
  * zlib-1.2.8
  * lua52-5.2.4
  * pixman-0.32.8
  * libpng-1.6.21
  * cairo-1.14.6



==============================================================
Luatex beta-0.87.0 was released 2015121700 
==============================================================



This is a next step upto 0.90 and it has the following changes:

- image data is no longer stored in the format (it was fragile anyway)

- pdf backend data generated when in ini mode is no longer stored in  the format

- (incomplete) \mag support removed from pdf backend (this functionality is
  kept in dvi mode)

- there are a couple of improvements that should make luatex run a little bit faster
  (but of course that depends on the job at hand)

- some further pending issues / cleanup has been done (but this is not reflected in the
  interface)

- there is a new primitive \nospace:

  \nospace=1   do now not inject glue for spaces (not even zero glue)
  \nospace=2   inject zero glue for spaces

- there are new primitives \hpack, \vpack and \tpack that are like \hbox, \vbox and
  \vtop but they don't trigger callbacks

- we no longer keep track of older math character and delimiter definition states,
  but this should normally go unnoticed

- from now on only ^^XX, ^^C, ^^^^XXXX and ^^^^^^XXXXXX are supported so no funny odd
  values (three and five)

- texio.setescape(0) disables escaping to terminal (a matter of taste)

- the (current) lc codes are now saved with the (current) language when patterns are
  loaded unless one hs used \hjcode instead of \lccode; overloading of \hjcodes is
  possible (but of course goes ahead of hyphenation which is delayed till parbuilding or
  packaging

- active characters can now be set with: \letcharcode123=\foo (experimental)

- there are some experimental new primitives but these will be described when they are
  stable (currently being tested)

- there is more backend error reporting and all error messages adn warnings (the non-tex
  ones) have been normalized

- of course there are the usual small fixes and additional setters and getters in libraries
  (see manual)


==============================================================
Luatex beta-0.85.0 was released 2015111400 (5550)
==============================================================
-- roadmap

The 0.85 release is has a lot of changes. It is the prelude to 0.90 which itself is
a prelude to the 0.95 that will go on texlive 2016. The 1.00 release will happen
around the 2016 context meeting. After that 2.* will become the next experimental
branch (leading to 3.*). The most important changes between 0.80 and 0.85 are mentioned
below. For more information consult the manual.

-- the backend commands

There is a better separation between front- and backend code. Some of the generic
\pdf* commands have been promoted to core primitives (with different names), some
have been removes like ximagecolordepth and ximagebbox have been removed and
all that are left have been organized differently. The backend is now more abstract
and provides three primitives only

  \pdfextension <keyword> <optional spec>
  \pdfvariable  <keyword>
  \pdffeedback  <keyword>

The first replaces \pdfannot and alike, the second replaces the variables that can
be sused to control behaviour, and the third accesses the read only variables. See
luatex-pdf.tex in the context distribution for a plain definition file.

The big advantage of the separation (basically core (lua)tex + extensions) is that
changes in the backend don't have consequences for the frontend and it's easier to
locate possible issues in the code. We might split a bit more at the lua end too.

-- nodes

The boundary, dir and localpar whatsits are now normal nodes. The xforms and ximage
whatsits are now a special kind of rule nodes (subtypes 1 and 2) and known as box-
and image resources (see manual). Also, empty rules are now a valid subtype (subtype
3) with related commands \nohrule and \novrule.

At the lua end one can now access the fields of a spec subnode directly in the parent,
which has the benefit of more control and robust assignments (no need to check for
writeability) while we keep the concept of shared glue specs (tex internals). By
staying close to traditional TeX the Knuthian documentation still applies in most
cases.

The pdf action nodes are now pdf_action whatsit nodes (so no longer a pseudo core
node).

You can get the node subtypes with the node.subtypes function which adds a layer
of abstraction (foo.subtype = "string" might be added in the future).

-- expansion

The hz optimization already only supported level 2 optimization, but now has a variant
3 that does only stretch glyphs and not kerns. Pending is a change where we go back to
percentages instead of fractions of em.

-- math

The old/new codepath has been checked and italic correction which is fundamental
different between the engines has been (partially) redone.

We now have \mathsurroundskip that replaces mathsurround when it's non zero.

The \mathtoptions (old 1) directive can be used for testing. This primitive is mostly for
ourselves and used for development.

The \Umathcharclass, \Umathcharfam and \Umathcharslot primitives can be used to fetch
properties of a math character.

The new \Uleft, \Uright and \Umiddle fence operators accept "height <dimen>", "depth
<dimen>" and the "noaxis" keyword as well the "exact" keyword for non-fitting ones. There
is also \Uvextension. Optionally one can specify a 'class'.

The \Udelimiter[under|over] and \U[under|over]delimiter primitives accept a width as well
as left, middle and right keywords (for non fitting ones). There is also \Uhextension.

The \abovewithdelimiter command accepts 'exact' as keyword (before the dimension) which nils
the excessive spacing. The normal vgaps still apply.

We have a new fraction primitive \Uskewed with a companion \Uskewedwithdelims. Optional
keywords are 'noaxis' and 'exact'.

There is a new directive \mathdisplayskipmode (esp for controlling the > 0 below skip check).

With \mathscriptsmode you can fix anchoring of scripts (as needed for chemistry).

The \Umathaccent commands accept a width and fraction argument.

-- hyhenation

The discretionary command now accept an optional "penalty <number>" specification
where the penalty will be stored with the node. Default is hyphenpenalty.

-- file io

texio.write/write_nl now writes to file if the first argument is a (valid) number
reference to a file opened at the tex end; you can now open 128 files from the tex end
(0..127) and the system command is no longer executed with 18

-- lua interface

The tex.<internal variable> is hopefully better now. The tex.get* also can handle
the built in registers. Especially prevdepth access should work out ok now.

-- and ...

As usual there are lots of small fixes, improvements, overhauls, small additions,
hopefully all mentioned in the manual.

-- warning

This version is probably not compatible with the macro package that you use as some
engine specific initializations need to take place (\pdf commands) and some node types
have been changed. We now have separated pdf backend commands and the only left
primitive categories are: core, (tex), etex and luatex, so no more pdftex, omega and
umath (where the distinction became to fuzzy). Of course you can still prefix.



==============================================================
Luatex beta-0.81.0 was released 2015100722 (5350)
==============================================================



* A couple of primitives are removed, renamed and/or promoted to core (luatex) primitives. 
Here's a summary. It might demand some adaption in the way macro packages initialize so we will mention them here explicitly in advance. As shown below, a simple way to get backward compatibility is to \let old ones to new ones. So,

   Updating to this version also might demand an update in the
   macro package that you use!

Here we go:

% removed, can be done with callbacks if needed, one can define dimen dummies, like

\newdimen\pdfeachlineheight
\newdimen\pdfeachlinedepth
\newdimen\pdflastlinedepth
\newdimen\pdffirstlineheight
\newdimen\pdfignoreddimen

% removed, were already obsolete, one can \let them

\let\pdftexversion \luatexversion
\let\pdftexrevision\luatexrevision
\let\pdftexbanner  \luatexbanner

% promoted (from pdftex), so pdf prefix gone, one can \let them

\let\pdfnormaldeviate \normaldeviate
\let\pdfuniformdeviate\uniformdeviate
\let\pdfsetrandomseed \setrandomseed
\let\pdfrandomseed    \randomseed

% promoted (from omega), so pdf prefix gone, one can \let them

\let\pdfpagewidth \pagewidth
\let\pdfpageheight\pageheight

% redundant (etex wins over omega), so \font-less ones gone, one can \let them

\let\chardp\fontchardp
\let\charht\fontcharht
\let\charit\fontcharit
\let\charwd\fontcharwd

% promoted (from aleph)

\pagerightoffset
\pagebottomoffset

% promoted (from pdftex)

\ifincsname
\expanded
\quitvmode

% removed (from pdftex), so *pdf* ones gone, one can \let them

\let\ifpdfabsnum   \ifabsnum
\let\ifpdfabsdim   \ifabsdim
\let\ifpdfprimitive\ifprimitive
\let\pdfprimitive  \primitive

% promoted (from omega)

\pagedir
\bodydir
\pardir
\textdir
\mathdir

% promoted (from aleph)

\boxdir

% promoted (from pdftex)

\lpcode
\rpcode
\efcode
\leftmarginkern
\rightmarginkern

\tagcode
\letterspacefont

% promoted (from pdftex), so *pdf* ones gone, one can \let them

\let\pdfprotrudechars\protrudechars
\let\pdfadjustspacing\adjustspacing

\let\pdfnoligatures  \ignoreligaturesinfont
\let\pdffontexpand   \expandglyphsinfont

% promoted (from pdftex), so *pdf* ones gone, one can \let them

\let\pdfsavepos \savepos
\let\pdflastxpos\lastxpos
\let\pdflastypos\lastypos

% on the todo list are:

\pdfoutput         : \outputmode
\pdfmatrix         : will get a normal syntax, no weird { } parsing

\pdfcolorstackinit : might become obsolete
\pdfcolorstack     : might become obsolete

So, apart from a few, the \pdf* primitives now relate to the backend only.

% There is also a new primitive:

\hyphenationmin

This one determines the minimum word length (per language).
 At the same time we moved the (ex)hyphenpenalties 
in the disc nodes so you can inject discretionaries with specific penalties.

There will also be an updated manual.
Hans


* new epdf.openMemStream(s,l,docid)
to create a pdf from a lightuserdata or  string.
(experimental, do not use in production.)

* uniform random generator in mplib is now specific for each numbersystem;

* too_precise implemented for binary number system;

* several bug fixes.


==============================================================
Luatex beta-0.80.0 was released 20150319 (5195)
==============================================================

* New library newtokenlib. It will replace the current token lib.
* Fixed a bug on the normal random generator for double/decimal/binary
  number systems.
* Several others bugs fixed.


==============================================================
Luatex beta-0.79.3.1 was released 20150122 (5140)
==============================================================

* Fixed a bug in  mp.w with a wrong input that gives a seg. fault.



==============================================================
Luatex beta-0.79.3 was released 20150121 (5130)
==============================================================


* It's now possible with the MinGW compilers to build luatex and luajittex as DLL 
  for Windows 32bit/64bit.  The files are:
  libkpathsea-6.dll  luajittex.exe  luatex.exe  texlua52.dll  texluajit.dll
  In the next release the build.sh script be updated; for the moment just add
  "--enable-shared -disable-native-texlive-build " after --disable-all-pkgs 
  in TL_MAKE. 
  Building as DLL was tested only for Windows.

* When possibile  symbols in the exe are now hidden: 
  this should avoid conflicts with the loading of dynamic shared object.

* several bugfixes and improvements. The patches for MetaPost
  fix seg. faults occourred with wrong inputs.
  The functions:
   mp_get_numeric_value, mp_get_string_value, mp_get_boolean_value 
  works if the value is a variable (i.e. not an internal variable, 
  a loop variable and a macro argument);
  only mp_get_numeric_value now has support for loop variable
  and internal variable (but still  not for macro arguments).


==============================================================
Luatex beta-0.79.2 was released 20141111 (5082)
==============================================================


* WARNING: the structure of the format file is changed.
  After  the  Web2C \TeX's magic constant: "W2TX"  there is now
  a FORMAT_ID, a 32bit field that cannot be between 0 and 256 (included)
  so that there are no conflicts with the preexisting  structure
  of the format.
  The value can be seen with --debug-format and currently is
  907 (the sum of the values of the bytes of the ASCII string "don knuth").

* There is a new set of lua functions for StructElement and Attribute,
  convenient (even if not indispensable) for tagged pdf.
  

* several bugfixes and improvements.


==============================================================
Luatex beta-0.79.0 was released 20140328 (4960)
==============================================================

* The luafontloader now returns 'tsidebearing' glyph values
  for OT/TT fonts, if applicable.

* new lua variables: stats.luatex_hashtype, stats.luatex_hashchars,
  stats.lastluaerrorstring; the luajittex string hash method is now
  lua 5.1 compliant which gives better results for similar strings

* new lua functions: tex.init_rand(), tex.uniform_rand(),
  tex.normal_rand(), tex.lua_math_randomseed(), tex.lua_math_random(),
  tex.show_context(); these helpers make luatex and luajittex compatible

* In the lua node interface, there were often issues with rubbish
  in (especially) 'prev' fields because luatex itself never looks
  at those values. This is now cleaned up to prevent weird stuff
  happening inside lua node processing code.

* pdf.pageattributes, pdf.pagesattributes, pdf.info, pdf.catalog,
  pdf.names and pdf.trailer now behave consistent and can be used
  to add these properties at the lua end in addition to their \pdf*
  counterparts atthe tex end; there are now pdf.get* and pdf.set*
  commands for them too (in future versions the old ways can become
  obsolete)

* new accessors pdf.geth, pdfgetv, pdfgetpos, getgetmatrix as well
  as pdfhasmatrix helpers (in future versions the direct pdf.h and
  pdf.v accessor can become obsolete)

* the pdf.pdf* variables have been removed (they were already
  obsolete for some years)

* a new properties mechanism for associating lua tables with nodes
  that get cleaned up when nodes a freed (see manual for details)

* several improvements to the way temporary (backend) data is stored
  at the lua end (better protection, more consistent)

* a 'l' type for user nodes that holds a lua variable (can be set
  at the lua end)

* if a late lua node is set at the lua end the string value can be
  a function as well which is then executed during serialization to
  the backend stream

* Various small speedups

* Various smallish fixes to the node direct interface

* LPeg is now at version 0.12

* Some small fixes to the CFF (font) parsing

* Font file inclusion reporting messages on the terminal now
  comply to the texconfig.trace_file_names setting

* Removed some of the additional luafontloader.info() return
  information that was added in 0.78.2, but could not work
  properly.

* new primitive \luafunction (see manual), with associated
  lua.get_functions_table() function

* lua error message reporting has been altered a bit to make
  the distinction between \directlua and other lua source code
  sources clearer

* Additional pdf document data functionality in the 'pdf' table
  has been cleaned up internally

* Additional pdf destination names can now be set via lua.

* New callbacks: finish_pdfpage, show_error_message,
  show_lua_error_hook, start_file, stop_file

* Handling of \tracinglostchars is fixed

* Embedded metapost library version is now 1.900

* luajittex is now included in the distribution. One can use
  buildjit.sh to build both luatex and luajittex, where
  supported by the platform

* Synchronization with the TeXLive sources updated the following
  libraries:
  * libpng is now 1.6.10
  * poppler is now 0.25.2

==============================================================
Luatex beta-0.78.2 was released 20140113 (4748)
==============================================================

* Extended luafontloader's info() function to include data
  from the 'pfminfo' and 'names' structure.

* Fixed a bug in the luafontloader library that made loading
  some fonts extremely slow (LastResort.ttf)

* Removed a recent extension in the luafontloader library that
  made loading fonts with lots of glyphs slow (ArialUnicoce.ttf).
  Note: the extension made sure that there were no duplicate
  glyph names in the font after loading.

* Restored --recorder output for lua files (dofile/loadfile/io.open)

* One-at-a-time pattern adding from lua used to require enormous
  amounts of memory

* luatex's fontloader.to_table() no longer reports 'altuni' table
  information for alternates that are solely driven by the font
  encoding. This fixes loading time issues for fonts that fill
  encodings by copying a single glyph many times, like e.g.
  LastResort.ttf from Apple.

* The datestamp no longer appears in any banners. The associated
  \luatexdatestamp primitive is deprecated and will be removed
  in 0.80.0.

* Synchronization with the TeXLive sources updated the following
  libraries:
  * cairo is now 1.12.16
  * pixman is now 0.32.4
  * lua is now 5.2.3
  * zlib is now 1.2.8
  * poppler is now 0.25.0

* That same TL synchronization also fixes these issues:
  * Always write "\nendstream" to the PDF for PDF/A-1b compliance.
  * Large file support (>4GB) in Lua
  * Big images could overflow on systems where sizeof(long)=4.
  * In writing CID CFF fonts to the PDF, and end_dict() was missing.
  * Unknown 'post' table versions (found in some broken ttf/otf
    fonts) are now treated as-if they specified version 3.0.
  * Fix crashes on 32-bit systems caused by bad C header inclusion
    order
  * Handle '--luac' and '--luaconly' properly
  * luatex is now released under GPLv2+, not just GPLv2.
  * luatex can now find .ofm metric files even if the extension
    is not given explicitly.

* node.unset_attribute() was broken in 0.78.0

* The UTF-8 commandline patch from 0.78.0 for Win32 was removed
  again (did not work properly)

==============================================================
Luatex beta-0.78.0 was released 20131231
==============================================================

* Instead of using expanded fonts, just calculate the expanded
  width of glyphs where needed, and carry expand info in the
  glyph nodes (all based on Hans' suggestions). All font expansion
  functions are disabled and most are removed.

* New, faster (but limited) direct node access from lua, see
  the manual for details

* Support for Apple Advanced Typography (AAT) information in
  fonts is dropped

* Extended build script for mingw/msys (includes 64-bit support)

* Various patches from/via Akira Kakuta for better Win32
  integration

* Fixes for some bugs in de pdfscanner library (mostly related
  to inline images)

* Maximum hyphenated word length is now 64Kb characters.

* Various patches from Khaled Hosny and Luigi Scarso for the
  luafontloader subsystem

* Fix for a crash when re-dumping formats

* Fix for a Selene unicode library bug where some characters in
  UTF-8 were incorrectly flagged as having the 'Space' property

* Some smaller fixes

==============================================================
Luatex beta-0.76.0 was released 20130405
==============================================================

* Metapost 1.801.

* Small patches from TeXLive 2013, as well as an update to the
  latest libraries (libpng, poppler, etc.)

* Speed up printing (of TeX strings) to the terminal and log.

* New lua function node.end_of_math().

* Fixed a memory leak in the lua function pdfscanner.scan().

==============================================================
Luatex beta-0.75.0 was released 20130301
==============================================================

News:

* New expandable primitive \Uchar.

* Metapost 1.790.

* New version of lnodelib.c with speedups by Hans and Luigi.
  Also added some extra sanity checks to the Lua node field
  setting functions.

* Support 'umath' in tex.extraprimitives(), so that formats can
  make the \Umath* primitives unprefixed, now that they will be
  provided by XeTeX as well.

* Removed a bunch of deprecated primitives
  * \AlephVersion, \Alephrevision, \Alephversion, \Alephminorversion
  * \OmegaVersion, \Omegarevision, \Omegaversion, \Omegaminorversion
  * \omathcode, \odelcode, \omathchardef, \omathchar, \omathaccent,
    \odelimiter, \oradical
  * \Umathbotaccent, \Umathaccents

* Fix large file support.

* Fix Lua's loadfile().

* Removed the cidmap callbacks again (let that be done by user lua
  code after the fact).

* Removed the fatal error on fonts where num_glyphs is too high,
  as that problem is actually harmless.

* Some compilation issues under Win32 and Solaris resolved.

* Allow math extender objects to be zero width.

* The 'epdf' library has been extended to deal with finding and
  saving embedded files (catalog:numEmbeddedFiles() and catalog:
  embeddedFile, new EmbFile object).

==============================================================
Luatex beta-0.74.0 was released 20121224
==============================================================

News:

* lua 5.2
  There are no patches to the core Lua files; a future version
  of luatex will switch to loading the regular lua 5.2 dynamic
  library instead of depending on a statically compiled
  one.

* A bleeding-edge version of luasocket is included, as there
  is no 5.2-compatible official release yet.

* A new lua extension is the two-argument version of
  string.dump from Luajit:

    string.dump(function f, [boolean strip])

* mpost 1.780

* The implied existence of the following lua libraries is now
  deprecated:

     debug, unicode.*, luazip, lfs, lpeg, zlib, gzip, md5,
     socket.*, profiler, epdf, fontloader, mplib, and
     pdfscanner.

  Future versions of luatex will load these modules on demand
  from dynamic libraries.

  Please update your sources to include a 'require' line for
  each of the library modules mentioned.

* Two new callbacks: find_cidmap_file and load_cidmap_file
  (used by the fontloader to discover .cidmaps)

==============================================================
Luatex beta-0.72.0 was released 20121210
==============================================================

News:

* update various used libraries, including mplib 1.770,
  poppler 0.21, libpng 1.5, and lpeg 0.10.2.

* new 'pdfscanner' lua library.

* various OpenType math fixes, including \Umathcharnumdef.

* improved placement of bottom accents.

* various other small fixes that have accumulated over the past
  year-and-a-half.

==============================================================
Luatex beta-0.70.1 was released 20110519
==============================================================

News:

* fixed: recorder file location from TL (Akira).

* fixed: missing newline on 'No output' line.

* fixed: relative names in synctex file.

* fixed: 16bit png images in generated %!PDF-1.4.

* fixed: building with (installed) libpng < 1.5.0

* fixed: year in --version output.

* fixed: box output to synctex.

* fixed: FontDescriptor for non-embedded OpenType fonts has an
  invalid FontFile3 entry (#654)

* fixed: crash on non-existent images.

* fixed: small memory leak in the ipc code.

* fixed: tex.print() and tex.sprint() don't recognize -2 as the
  first argument (#659)

==============================================================
Luatex beta-0.70.0 was released 20110506
==============================================================

News:

* fixed: various changes needed for libpng 1.5.2.

* fixed: node.fields() for nodes without subtype.

* fixed: non-argument use of os.execute().

* fixed: tex.[s|t|]print() with invalid catcode table arguments.

* fixed: recorder filename location with --output-directory.

* fixed: display alignment in TRT mode.

* luatex now uses the standard synctex files from Jérome Laurens.


==============================================================
Luatex beta-0.66.0 was released 20110412
==============================================================

News:

* fixed: linebreak_filter doesn't do its default job when
  tex.linebreak is used

* fixed: \escapechar ignored by \meaning

* fixed: wrong px default

* fixed: font kern attribute inheritance

* fixed: "nop" unrecognized in virtual fonts

* fixed: assertion failure in dviluatex when font ptmr8t used

* fixed: tex.settoks for with strings with embedded zeroes

* fixed: an indexing problem with nonexistent font glyphs

* fixed: some crashes and other bugs on the 'subtype' and 'prev'
  fields (not all node types have those fields)

* fixed: crash on  token.csname_id ("")

* fixed: initialize the statically allocated node's type ids

* fixed: fencepost error in math parameter counting

* fixed: math family numbers > 255 are allowed

* fixed: compilation failure on Hurd

* fixed: a small bug leading to displacements when reading
  the AccentTop table

* fixed: \directlua followed by \pdfximage generates error if
  draft mode is active

* fixed: a problem with \vadjust pre in alignments

* fixed: a lua stack growing problem in the backend in 0.65.0,
  resulting in an inability to create more than a few thousand
  generated pages

* fixed: inclusion of Scribus-generated pdfs

* adapt: the default form margin is now zero (was 1bp before)

* adapt: libpng 1.4.4, zzuplib 0.13.60, mplib 1.504

* adapt: small changes to the build system and new imports from
  the texlive repository

* feature: new function node.currentattr() queries the current
  active attribute list

* feature: Lua font loading; ignore unknown enumeration keys in
  MathConstants

* feature: JPEG 2000 image support

* feature: continuing work on the 'epdf' library

* doc: the 'epdf' lua library is now documented

* doc: various other manual corrections


==============================================================
Luatex beta-0.65.0 was released 20101213
==============================================================

News:

* The Aleph and Omega version primitives are deprecated.

* The Apple Snow Leopard Truetype font collections now work
  properly.

* Libpng has been updated to 1.4.4, and zlib to 1.2.5.

* New lua functions node.next() and node.prev().

* The already deprecated for some time node.protrusion_skipable()
  function has been removed.

* fontloader.apply_featurefile() and fontloader.apply_afmfile()
  now return nil,<errortable> on failure.

* The various node list fields in the lua node interface have
  been renamed from 'list' to 'head', e.g. tex.box[0].head,
  and the 'list' name is deprecated. For now, the deprecation
  is silent, as 'list' will stay for quite some time. Please
  update your lua source as soon as possible, though.

* The call node.type(<node>) now returns "node". The existing
  functionality is otherwise unchanged.

* Luafilesystem has been updated to 1.5.0. NOTE: there is an
  incompatible change in the directory iterator method.

* The restriction on linebreak_filter has been eased: at least one
  horizontal box should be returned, but that is not necessarily
  the last node any more.

* Backward compatibility has been restored for \meaning\mathchar

* node.first_character() has been renamed to node.first_glyph()
  to better match its actual functionality.

* The \Umathaccent primitive now supports both/bottom keywords,
  and \Umathbotaccent / \Umathaccents are now deprecated.

* The \Umathaccent primitive now also supports the fixed keyword,
  which supports non-growing math accents even if the font says
  there are extensible variants.

* Ongoing work on the epdf library.

Bugfixes:

* Assignment to \dimen65535 was broken earlier.

* <box>.head.prev is now always initialized to null (0).

* luatex -lua=<script> '\relax' no longer exits immediately,
  instead going into interactive mode as it should.

* The \jobname was initialized wrongly for input file names
  with multiple dots in them.

* The synctex file is now written in the right place when
  --output-directory is given.

* \letterspacefont could cause crashes, especially when combined
  with font expansion.

* Luatex would crash on linux32 systems if it was build in an
  environment where LFS (>2GB files) was enabled by default.

* Node lists created by node.copy_list() could not be hyphenated
  due to an assertion error.

* Synctex support was partially broken since 0.60.0.

* With OpenType math fonts, accents with multiple parts
  (like the \vec arrow) forgot to include all parts if the
  accentee was too narrow.

* With OpenType math fonts, accents over any class except 0 and 7
  were misplaced.

* kpse.lookup("plain", {all = true}) was broken in kpathsea
  itself (no extension given as well as --all specified).

* A FontForge bug made Cambria Math accents look bad, and the
  placement of math top accents did not allow a marker at the
  origin (patches by Stefan Philipp)

* Cut&Paste from PDF was sometimes broken due to bad ToUnicode map.

* Many small manual improvements (thanks to Paul Isambert)

* An other bugfix to lpeg 0.9 (from Roberto Ierusalimsky)

* Some small fixes to writet1.w (from Han The Thanh)

* A build failure because of bad libz configuration on Win32

==============================================================
Luatex beta-0.64.0 was released 20101112
==============================================================

News:

* New lua functions pdf.refobj(), pdf.maxobjnum() and pdf.objtype()

* New lua function node.is_node()

* The max_strings configuration variable's maximum value is
  raised to be identical to texlive's maximum (2097151), and
  same for param_size (32767).

* The embedded mplib is now 1.503.

* Minor cleanups in the output of fontloader.to_table():

  - removed out-of-range altuni's from the output
  - don't dump the extra encodings, just the actual font encoding
  - export the encoding's name also as 'enc_name' at one level up
  - no longer exporting unset macstyles, nor zero uniqueids
  - fix creationtime and modification time

* Ongoing work on the epdf library

Bugfixes:

* Fix a bug where an explicit hyphen prevented hyphenation for the
  whole rest of the paragraph

* Internal font copying forgot to copy the last font dimen

* os.selfdir() is now documented

* patch quad (\fontdimen6) in \letterspacefont to be compatible
  with pdftex

* Multi-page pdf inclusion was very slow in 0.63.0

* Some extra checks added to the handling of glue_spec node
  objects in lua code.

* Some node.prev pointers have been corrected (but this is not
  quite finished).

* A small fix to lpeg 0.9.


==============================================================
Luatex beta-0.63.0 was released 20100909
==============================================================

News:

* Drop tex.ht[], tex.wd[], tex.dp[].

* Drop OCP support (and associated primitives).

* Add tex.catcode[], tex.lccode[], tex.sfcode[], tex.uccode[],
  tex.mathcode[] and tex.delcode[] and associated functions.

* Add CIDset tables to the output pdf where appropriate.

* Added a 'string' field to late_lua nodes on the lua side. This
  field does not convert the assigned string to a tokenlist.

* The result of fontloader.open() now has some virtual accessors
  (as well as fontloader.to_table).

* There is now a `short reference' in the manual folder
  (functionref.pdf)

Bugfixes:

* Fix a crash on an empty font (bugreport #468).

* Fix a crash for extremely long pattern arguments.

* Fix a crash on bad virtual character arguments in lua.

* Fix hyphenation exceptions.

* Prevent linebreak between initial local_par paragraph whatsit
  and a following skip (bugreport #437).

* Fix placement of scripts on textstyle big operators in MATH
  fonts (bugreport #466).

* Fix a crash on the return value of MPlib's 'postscript'
  operation on images.

* Fix a crash on \leftghost & \rightghost in math mode.

==============================================================
Luatex beta-0.62.0 was released 20100823
==============================================================

News:

* LuaTeX now uses libpoppler (0.12.4) instead of xpdf.

* All backend functions now report what file they were searching
  for whenever a file cannot be found.

* Input-ed lua files are now mentioned in the fls file if
  the --recorder switch is specified on the command line.

* Paragraph indentation hlist nodes and hlist and vlist nodes
  generated by alignment rows and cells now have a subtype
  (3 for indent box, 4 for rows/columns, 5 for cells).

* The 'epdf' lib is in active development and still growing.

* The 'fontforge' table is finally removed (was deprecated
  since 0.40).

Bugfixes:

* A new mplib import fixes two bad bugs in mplib:
  - string equality test was wrong
  - type declarations could delete pre-existing variables

* PNG images with transparency could create random size
  differences in the generated PDF.

* In some special cases, font expansion could cause wrong
  spacing in the generated PDF.

* \letterspacefont was broken since a very long time.

* The node subtype of the \leftskip and \rightskip glues was
  wrong.

* Some memory leaks have been removed.

* Various manual fixes.

==============================================================
Luatex beta-0.61.0 was released 20100728
==============================================================

New features:

* New lua library 'epdf' for introspection of PDF inclusions,
  see the manual for details.

* Mplib version 1.502 is now included (which is still beta,
  so be careful).

* new "finish_pdffile" and "pre_dump" callbacks.

* new function pdf.pageref()

* In the lua 'tex' library: assignment to internal glue
  parameters is now allowed.

* New lua function tex.error().

Bugfixes:

* Fix for crashes on fonts with bad Panose values.

* Fix for a box placement bug that could sometimes cause text
  to overlap.

* Fix for a few small PDF/A1-a compatibility bugs.

* Fix \letterspacefont.

* Fix \Ustopdisplaymath in combination with aligned displays.

* In math delimiters, the last of a chain of predefined sizes
  was always ignored if there were also extensible parts.

==============================================================
Luatex beta-0.60.2 was released 20100701
==============================================================

Bugfixes:

* Various small portability fixes, especially for non-gcc
  compilers.

* Updated synctex from Jerome Laurens.

* fix bug #406: \pdfliteral hinders hyphenation.

* fix pdf overprinting bug (related to \pdfliteral).

* patch from Akira Kakuto that ensures that only absolute commands
that are inside the %PATH% will be executed in win32's restricted
\write18

* fix a buffer overflow in luafontloader.

* fix cross-platform share-ability of generated formats.

* fix a few typos in the manual.

* fix trashing of the null glue spec by attribute reference code.

* documented the deprecated state and brokenness of otp processing.


==============================================================
Luatex beta-0.60.1 was released 20100428
==============================================================

New features:

* renamed node.skipable() to node.skippable().

* More git discovery patches in getluatexsvnversion.sh.

* Added --warnings=[no|min|yes|max|all] option to build.sh.

* While cross-compiling, build.sh now adds an extra linker switch
  to allow win32 exes to use 3G instead of 2G of virtual memory.

Bugfixes:

* os.exec() & os.spawn() handled the environment differently from
  os.execute() on Win32 (patch from Tomek)

* Builds with --enable-ipc were broken.

* Assigning and acquiring \fontdimen s from TeX code was broken.

* An initial attempt at fixing bug #372 (\predisplaydirection).

* An attempt to fix \eqno/\leqno placements in mixed direction
  \mathdir/\textdir.

* Our local xpdf patch is reverted, it is not needed any more.

* The os.selfdir variable was not documented, as well as broken
  on WIN32.

* Fix "\input tikz hello \bye" bug, plus fix one sign error.

* Fix handling of lua script files with UNC names.

==============================================================
Luatex beta-0.60.0 was released 20100404
==============================================================

New features:

* os.name now knows about CYGWIN (from Elie Roux)

* Internal handling of direction specifiers is faster now.

* Each glyph node now has three new virtual read-only fields:
  width, height, and depth (values in scaled points, of course)

* There are new functions node.protrusion_skipable() and
  tex.badness() (useful for paragraph breaking in lua)

* Also new: tex.linebreak(). See the manual for details.

* All lua errors now report file and line numbers to aid in
  debugging.

* Import of metapost 1.211.

* pdf.pdfcatalog will be replaced soon by the new pdf.catalog
  pdf.pdfinfo will be replaced soon by the new pdf.info
  pdf.pdfnames will be replaced soon by the new pdf.names
  pdf.pdftrailer will be replaced soon by the new pdf.trailer

* pdf.pdfmapfile and pdf.pdfmapline are replaced by the new
  pdf.mapfile() and pdf.mapline() functions. (a function interface
  fits these parameters better because they never return anything).

* New read-write lua variables: pdf.pageattributes, pdf.pageresources,
  pdf.pagesresources

* getluatexsvnversion.sh now correctly detects git-svn and still
  manages to find a valid SVN revision number (from Patrick Gundlach)

* Many of the source files have been converted to CWEB.

Bug fixes:

* GNU libtool is now used to solve the various technical issues with
  dynamic loading of lua modules.

* Error detection in scan_integer_part was wrong due to missing
  initialization of OK_so_far (spotted by Javier Mugica)

* Synctex was broken in 0.51-0.52.

* \lastlinefit was broken since ... well, nearly forever.

* Reading of binary files with length zero was broken.

* Trapping of unitialized rules (this was for sloppily created
  rule nodes from lua)

* pdf.immediateobj('streamfile') was broken on 64-bit platforms.

* tex.linebreak did not take the given left and right skip, but
  instead used the current TeX-side values (bug #356).

* the found 'MAKE' command in build.sh is now fed into configure to fix
  problems with that not finding GNU make even when it is actually
  installed.

* dofile(<nil>) and loadfile(<nil>) in batch mode now give an
  error and continue instead of pointlessly waiting for user input.

* Reverted commit #3417 (the buildpage experiment) as it causes bad
  things to happen when items are waiting during page breaks.

* Overrule loaders[4] in --safer mode, make require() behave
  closer to normal lua 5.1, and add some nicer error messages
  (based on an email and patches from Manuel Pegourie-Gonnard)

* Added an extra sanity check for GDEF loading in luafontloader,
  based on a crash caused by Linux' AkaashNormal.ttf.


==============================================================
Luatex beta-0.52.0 was released 20100316
==============================================================

New features:

* Various small manual improvements.

* A better version of getluatexsvnversion.sh, from Tomek.

* node.copy_list() now allows the second (optional) argument to
  be nil.

* An import of the current state of the texlive repository
  (kpathsea and build system).

Bug fixes:

* An attempt fix for bug #345 (math kerning is not perfect): when the
  current math font is a new math font, check against \catcode <cur_c>
  == 11 to suppress the italic correction, instead of looking at
  the value of space(<cur_f>).

* There is a new <tfmtable> key: 'units_per_em' (defaults to 0).
  This is part of a fix for bug #200 (Problem with CFF fonts having
  em-size other than 1000): there is a special correction to the
  embedded cff font itself and the font scale if the font to be output
  is opentype or type1 in unicode encoding and the 'units_per_em
  differs' from zero.
  <tfmtable>.units_per_em has to be passed back to luatex from
  the lua font loading code for this to work.

* A fix for bug #314 (problem with pk file).

* lua code can no longer change the internal preallocated glue_spec
  nodes (as that resulted in weird spacing bugs). For this, glue_specs
  now have a new field: 'writable'. If that field is false, a copy
  has to be made of the glue_spec instead of doing an assignment
  to it.

* Setting of \textdir inside the output routine could trash output
  on following pages due to a lingering internal variable.

* \pdfthread crashed because the arguments were handled in reverse
  order.

==============================================================
Luatex beta-0.51.0 was released 20100312
==============================================================

New features:

* Various small manual improvements.
* The backend message "cannot open Type 1 font file for reading"
  now reports which Type1 font it was looking for.
* Fontforge clears some font names at loading time that will be
  refilled in at font generation time, but the fontloader should not
  do that. Patch from Khaled Hosny.
* New synctex code imported from TeXLive.
* luamd5/md5.h is renamed to luamd5/luamd5.h to avoid confusion.
* Embedded mplib is now 1.209.
* Some experimental tweaking of buildpage_filter, see the manual
  for details.
* Luatex now detects kfreebsd (from Alan Braslau)
* The new lua function tex.sp() converts a string to a number
  representing scaled points.
* There is now support for revision numbers in the banner and stats
  library again.
* The command line help and manual documentation page is extended.
* node.hpack() now also accepts "cal_expand_ratio" and "subst_ex_font"
  modifiers.
* node.hpack() and node.vpack() now give back the badness of the box
  as second return value.
* node.copy_list() now allows a second (stop) argument, this stopper
  is not copied.
* new lua functions in lfs: lfs.readlink() and lfs.shortname().
* new lua function tex.tprint() that can combine multiple catcode
  regime prints in one function call.
* new lua sub-table: tex.nest[] (read/write access to the semantic
  nest state).
* New lua functions in kpse: kpse.lookup() and kpse.version(). See
  the manual for more details.
* New lua function tex.shipout().

Bug fixes:

* There problems in the pdf output for Type3 (pk) fonts.
* Fix a bug that allowed bad commandline quoting.
* Fix a bug that sometimes caused crashes when \pdfprotrudechars.
* The build script now exports CONFIG_SHELL to avoid problems with
  /bin/dash.
* The was a bug in the generated /Image /ProcSet.
* status.font_bytes reported the wrong value.
* Lots of compiler warnings are removed (thanks Javier Mugica).
* Patch to fontloader.info() to accept filenames with embedded
  parentheses.
* Fix a \write error with docstrip package.
* Fixed a crash on AdobeMyungjoStd-Medium.otf.
* Fix coco stack overflows, needed for lpeg.
* \pdfcompresslevel wasn't initialized for early immediate objects.
* Fix for slanted fonts when HZ was on (slant angle was multiplied).
* When concatenating content streams, put a space between them.
* Allow pfb lines to end with \r as well as \n (for msam10.pfb).
* Fix the internal string->scaled point conversion in the lua
  interface.
* Memory leaks in the fontloader removed, thanks to patches from
  Elie Roux.
* Fix a crash caused by the combination of coroutines and font.each().

Removed features:

* Support for Type3 .pgc files (nobody used them).

==============================================================
Luatex beta-0.50.0 was released 20091224
==============================================================

New features:

* Fonts now listen also to the 'extend' key in the lua font
  metrics table, and the processing for this is done via de
  pdf text matrix instead of via the font matrix, which means
  it now works for all font types.

* The embedded Metapost library is now at version 1.209.

Dropped features:

* It is no longer possible for fonts from embedded pdf files
  to be replaced by / merged with the document fonts of the
  enveloping pdf. This regression may be temporary, depending
  on how the rewritten font backend will look after beta 0.60.

Bug fixes:

* Use of \middle confused the \mathstyle operation.

* \pdfcolorstack handling was broken.

* node.unset_attribute() had a bug whereby it inverted the
  requested result in some cases (the node on which the unset
  was called was sometimes the only node at the current level
  that *kept* the attribute).

* During font expansion, the internal font copy had one character
  information object less than the original, resulting in the
  disappearance of a glyph in some fonts when font expansion
  was active.

* Placement of operator scripts of OT MATH fonts is adjusted
  to be conformant with Word's logic where the italic correction
  is only used to tuck in the subscript and for nothing else.

* luafontloader.open() no longer writes directly to stderr in
  case of internal font errors.

* Any <pdf_refobj_node>.objnum could not be assigned to.

* The lua 'pdf' table could not be assigned to.

* The lua 'md5' library was returning incorrect results on
  64-bit architectures.

* Luatex now compiles on GNU Hurd systems.

* Fix segfault when embedding stream file object (these
  backend segfaults were a side-effect of the string pool
  patches).

==============================================================
Luatex beta-0.47.0 was released 20091218
==============================================================

New features:

* New read-write lua variables pdf.pdfcatalog, pdf.pdfnames,
  pdf.pdfinfo, pdf.pdftrailer

* The horizontal mode nodes that are added to lines during line
  breaking now inherit the attributes from the first and last node
  inside the created line.

* The new function pdf.registerannot(<number>) registers an
  annotation object number to be included in the current
  page's /Annots list.

* The variables <metrics>.Mathconstants.FractionDelimiterSize
  and <metrics>.Mathconstants.FractionDelimiterDisplayStyleSize
  are added to the font table. This allows proper setting of the
  size parameters for TeX's ...withdelims math primitives.

* The internal representation of the string pool is reorganized
  (the pool of string characters is now allocated dynamically),
  and as a side-effect the lua variable status.init_pool_ptr
  is deprecated and will be removed in a later version. Also,
  status.pool_ptr now simply returns the current number of bytes
  in use for string characters.

* There are new lua variables pdf.pdfmapline and pdf.pdfmapfile
  (write-only strings that mimic \pdfmapline and \pdfmapfile).

* \pdfobj data and attribute are now stored as C strings instead
  of as token lists (this should speed up cases with a lot of data).

* Artificially slanted fonts now work via the pdf text matrix
  (instead of adjusting the actual font) so that it now also
  works for non-Type1 fonts. The lua <metrics>.slant font key is
  now obeyed in all cases.

* The lua function font.id(<string>) returns the internal font id
  number belonging to a control sequence name.

* Pdf image inclusion is optimized such that objects from an
  external pdf will now be included only once even if they are
  referenced from multiple inclusions.

Bug fixes:

* Protrusion for non-TLT documents did not work properly for
  the hyphenation character.

* \lastbox could not remove the paragraph indent box for non-TLT
  documents.

* Pdf images (\pdfximage) are no longer kept open during the
  whole run, but closed and reopened. An error is raised if
  the file has changed between \pdfximage and \pdfrefximage.
  This prevents the 'too many open files' error when lots of
  images are included.

* On Win32 Pdf image files are locked during the time that it is
  open, to prevent unnoticed file changes by external sources.

* Compilation now again works on FreeBSD.

* Format sharing between 32-bit and 64-bit architectures was
  broken.

* Unsetting attributes from lua could sometimes result in
  the unset state persisting beyond the current group level.

* If something went wrong in the scanning of pdf action items,
  the error message reported the current primitive name
  incorrectly.

* Luatex would crash on non-existant pdfs that were referenced
  from map file entries.

==============================================================
Luatex beta-0.46.0 was released 20091126
==============================================================

New features:

* The build.sh script now has better support for new MacOSX-es
  (patch from Mojca).

* Luatex now has experimental support for dynamic loading of
  external compiled lua libraries. Building luatex and loading
  external .so/.dll files is reported to work on Windows,
  linux and osx, other platforms are still unknown.

* pdf.obj{type="stream"} no longer converts its argument to and
  from a tokenlist. This allows the use of binary data in the
  "string" argument. Such data does still have to hidden from
  the normal file parser by putting the code in a dofile()
  or by using string.char(), though.

Bug fixes:

* Luatex 0.45.0 was not able to find truetype nor opentype fonts
  if there were no callbacks defined (patch from Pawel).

* 0.45.0 printed the user input instead of the full pathname
  for \input-ed tex files.

* The TFM reader now rejects fonts with tfm names that are
  longer than 255 characters because such font names cannot
  be stored in a DVI file.

* The combination of \immediate\pdfxform followed by a later
  \pdfrefxform could cause broken pdf output files because
  the box used for the form could have been freed and even
  reused already at that moment in time, sometimes resulting
  in an invalid transformation matrix.

* The placement of super- and subscripts for displaystyle
  \int's in CambriaMath is now better than before. It still
  needs a tweak to the metrics though: in the current version,
  the italic correction has to be substracted from the width
  of the integral sign to get correct placement (context mkiv
  does this).  to be continued ...

==============================================================
Luatex beta-0.45.0 was released 20091118
==============================================================

New features:

* Loading big OTF fonts via lua is now much faster than before,
  at the expense of a bit of precision loss in the calculated
  bounding boxes.

* Two new token lists are provided: \pdfxformresources and
  \pdfxformattr, as an alternative to \pdfxform keywords.

* \input and \openin now accept braced filenames.

* The \endlinechar can now be set to any value between 0 and 127.

* Luatex can now optionally use kpathsea to find lua require()
  files.

* The new primitives \aligntab and \alignmark are aliases for
  the use of & and # in alignments.

* \pdfrefximage [width <dimen>] [height <dimen>] [depth <dimen>] <imageref>
  overrules settings from \pdfximage for this \pdfrefximage call only

* The print precision for small numbers in lua code (tostring)
  has been improved.

* Akira Kakuto suppled a patch that restricts writing to files
  with names such as latex.bat etc. (on windows only)

* (un-feature): from now on luatex now only handles 4 direction
  specifiers: TLT (latin), TRT (arabic), RTT (cjk), and LTL
  (mongolian). The other directions now generate an error.

* (un-feature): xpdf's automatic lower- and uppercasing retry attempts
  for nonfound image pdf files has been removed.

* The callbacks hpack_filter, vpack_filter and pre_output_filter
  pass on an extra string argument for the direction, when known
  (nil == use default).

* The lua functions node.hpack(), node.vpack() and node.dimensions()
  now accept an optional direction argument (not given == use default).

* \pdfrefxform [width <dimen>] [height <dimen>] [depth <dimen>] <formref>
  scales a form object; similar principle as with \pdfximage: depth alone
  doesn't scale, it shifts vertically.

* A change to the relative ordering inside font name discovery for use
  by the backend: now it tries <f>.psname first, as that is much less
  likely to contain spaces.

* For ttc fonts, now the used subfont name and its index id are printed
  to the terminal, and if the backend cannot find a ttc subfont, the
  run is aborted.

Bug fixes:

* Prevent crashes for lua-loaded fonts without a (tfm) name.

* Remove spurious newlines in the output pdf that could be the
  result of using \pdfximage for an included pdf figure too early.

* Full font embedding for wide otf and ttf fonts now really
  works (older versions only pretended that it did work).

* node.dimensions() sometimes continued past the 'stop' node.

* Images inside virtual fonts were broken.

* The processing of \language=-1 was wrong, resulting in
  hyphenation attempts even though there was no proper language
  set up.

* Fix for finding files in --output-directory.

* Fix for handling of --file-line-error.

* tex.box[] assingments are now checked to make sure the assigned
  node has the right id (hlist or vlist).

* show_node_list (as in \showbox) produced spurious local_par
  whatsit prints in the output after direction nodes.

* The handling of pdf literals has been sped up.

==============================================================
Luatex beta-0.44.0 was released 20091027
==============================================================

New features:

* libpng is now 1.2.40.

* hlist nodes now have a subtype to distinguish hlists generated
  by the paragraph breaking, explicit \hbox commands, and other
  (as-yet-undefined) sources.

* \pdfobj now has an extra optional keyword: 'uncompressed',
  which forces the object to be written to the PDF in plain
  text (see the manual for the exact details).

* The lua file from the luamd5 library (which provides the
  md5.hexsuma() function) is now embedded in the executable.

Bug fixes:

* \latelua now works in DVI mode again.

* status.output_file_name could crash when used too soon.

* In 0.43, rules were not output at all in DVI mode.

* \leavevmode\penalty-10000\penalty-10000 crashed luatex.

* the API of margin kern nodes to lua was using the wrong
  fields in the nodes.

* A few fixes to the manual.

* PDF Xref stream dicts were slightly non-conformant.

* There was too much space between two consecutive math displays
  (this bug was inherited from Aleph)

* Synctex was broken (thanks, Akira)

* Font mark classes were handled incorrectly by the fontloader
  code.

* There was a crash possible with certain types of named PDF
  destinations.

* Math delimiters and large operators in new MATH fonts no
  longer apply the italic correction (this fixes placements
  of super- and subscripts on such items for those fonts).

* The converter from lua strings to token lists (for the node
  interface) sometimes generated invalid tokens.

* CFF (OpenType) fonts now listen to 'embedding="full"'. TTF
  is still todo.

* Font tables with 'embedding="no"' would cause luatex to crash.

* \pdfobj file {} failed to find the file if there was no lua
  callback in place.

* An optimization in MS Mincho caused luatex to crash.

==============================================================
Luatex beta-0.43.0 was released 20090819
==============================================================

New features:

* There is a new allowed key in the table trhat is returned
  by lua-loaded fonts: <f>.psname. This value should be set
  to the original PostScript font name of the font. Fonts inside
  dfont and ttc collections are fetched using this field
  (if it is missing, <f>.fullname will be used instead).

* It is now possible to use Apple dfont font files
  (those that contain at least one outline font).

* \latelua is now allowed inside leaders.

* There is a new callback: process_output_buffer, from Manuel
  Pégourié-Gonnard. This callback is called just before
  \write acts, so it can be used to alter the file encoding
  of text output files.

* There is a new node.dimensions() function, which calculates
  the natural size of (part of) a list of nodes.

* The new primitive \gleaders provides 'globally aligned'
  leaders.

* The DVI and PDF backends now share much code internally.

* The embedded MPlib is now 1.207.

* libpng is now 1.2.39.

Bugfixes:

* We fixed lots of anonymous bugs introduced in 0.42.0 (as expected)

* fontloader.info() errors are no longer fatal, the function now
  just returns a nil,"error string" pair.

* Automatically inserted kerns for \accents are now once again
  valid word ends, as in \TEX.

* Fixed the placement of math displays in mixed direction
  settings.

* The \pdfcompresslevel is now dynamic again.

==============================================================
Luatex beta-0.42.0 was released 20090717
==============================================================

* There is a new node.tail() function

* lua-loaded fonts now support a 'nomath' key to speed up
  loading the lua table.

* A bugfix in the ttf reader for the inclusion backend, and
  (also in the backend) support for treating ttc files by
  pretending they are single ttf fonts (both patches from pdftex)

* Add Khaled Hosny's man page to the repository

* The \pdfcompresslevel is now effectively fixed as soon as
  output to the pdf file has occurred.

* Patched status.filename so that it (nearly) always returns a
  file name.

* fix '\the\delcode' and disable '\the\odelcode', '\the\Udelcode',
  and '\the\Udelcodenum'

* Handle jfifs where either xres or yres is 0 and the other
  res is != 0 (from pdftex)

* The single-argument version of lang.hyphenate() was broken.

* Get rid of the \directlua/\latelua number warning.

* The Lua coroutine patch (coco) is now disabled on linux
  powerpc architectures (because it caused crashes)

* Removed obsolete pdftex primitives:
  \pdfoptionalwaysusepdfpagebox
  \pdfoptionpdfinclusionerrorlevel
  \pdfforcepagebox
  \pdfmovechars

* The loading speed of large fonts (especially ttf) via the
  fontloader library, and the inclusion speed for subsetting
  in the backend have both been improved.

* The 'pdf' lua library has been enhanced with various new
  functions, see the manual for details.

* BLT and BRT glyph position fixed.

* Various fixes for synctex offsets.

* Support for exotic font string encodings has been removed
  from the fontloader library.

* The embedded MPlib is now 1.205.

* libpng is now 1.2.38.

==============================================================
Luatex beta-0.40.6 was released 20090625
==============================================================

* Fix two string vs. toks bugs in the lua node interface:
  whatsit,annot and whatsit,startlink data assignments were
  made directly as strings instead of being converted to tokens.

* Sometimes pdf.print() could be used before the proper structures
  were initialized.

* There was a bug in the type codes for the lua package filter
  callback: wrong extra info was passed to lua for the alignment
  and vsplit cases.

* The math parameters \Umathlimitdownvgap, \Umathlimitdownbgap,
  and \Umathlimitdownkern have been renamed to \Umathlimitbelowbgap,
  \Umathlimitbelowvgap, and \Umathlimitbelowkern to be more
  consistent with the other parameter names.

* The embedded MPlib is now 1.204.

* Handling of UTF-8 hyphenation exceptions has been fixed.

* There were a number of typos in the manual.

==============================================================
Luatex beta-0.40.5 was released 20090610
==============================================================

* One of the internal print functions accidentally encoded its
  argument string to UTF-8 even though it was already UTF-8.

* Some of the log and terminal UTF-8 output was gibberish.

==============================================================
Luatex beta-0.40.4 was released 20090609
==============================================================

* \the\textfont0 returned a number instead of doing a font
  switch.

* The embedded MPlib is now 1.203.

==============================================================
Luatex beta-0.40.3 was released 20090608
==============================================================

* A set of portability fixes for the AIX compiler from Vladimir
  Volovich.

* A set of fixes to the synctex support.

* A patch to the build script to prevent installed X11 headers
  from being required.

* Some weave (web syntax) fixes from Manuel Pégourié-Gonnard.

* A simplification in luatex.ch (it is now less verbose
  about the web2c-specific extensions) from Karl Berry.

* A fix in the handling of UTF-8 (input) file names.

* Hyphenation exceptions were case sensitive in 0.40.2.

* libpng is now 1.2.37.

==============================================================
Luatex beta-0.40.2 was released 20090603
==============================================================

* Fix for a compilation warning under Cygwin.

* A complicated bugfix by Hartmut for a rounding problem in the
  VF loading that resulted in 'character width mismatch in font
  XY.vf ignored' messages at large load sizes

* The embedded MPlib is now 1.202.

* The post_page_number callback was accidentally run when
  shipping out xforms as well as during actual pages.

* When a math accent char doesn't have a bot_accent placer,
  luatex now uses the top_accent placer, if present.

* A crash caused by \Uroot .. {<list>}{...} is fixed

* A portability fix for solaris 8 sparc using sun studio
  compiler, and one for glibc > 2.9.90

* luatex -ini now sets the \catcode of the BOM character to
  ignore

* Kpathsea is updated from TeXLive, giving four extra types of
  searchable files: 'font feature files','cid maps','mlbib',
  and 'mlbst'.

* libpng is now 1.2.36

==============================================================
Luatex beta-0.40.1 was released 20090508
==============================================================

* Vertical placement of root radicals and degrees is fixed.

* The use of \pageleftoffset could deviate from \hoffset
  if \mag != 1000.

* LuaTeX now issues a warning if \pagedir !- \bodydir during
  shipout.

* The previous crash in font.read_tfm() was still not quite
  correct.

* The Web2C version is now also printed in the --version
  and --credits output.


* There is a new MPlib 1.200 release candidate with a few minor
  fixes included.

* The xpdf library is updated to patch level 3.

* New imports to the build system, from texlive. In particular,
  there is now configure-level support for building with
  libpoppler and support for building under cygwin 1.7 is added.

==============================================================
Luatex beta-0.40.0 was released 20090422
==============================================================

* The embedded MPlib is updated to version 1.200.

* Texlua would crash if run font.read_tfm() was used.

* Luatex would crash on empty \patterns.

* Lots of small C code cleanups.

* \textdir inside a \hbox dir *** was wrong earlier.

* 0.39.0 introduced a bug that would make luatex crash whenever
  font expansion was used.

* Font tables returned by define_font can now have a key named
  'cache' that controls the internal lua font table caching.

* There is no longer a need for an explicit --progname if there
  is no input file given.

==============================================================
Luatex beta-0.39.0 was released 20090415
==============================================================

* iniluatex will from now on start up with only the TeX82 primitives
  and \directlua, everything else has to be bootstrapped via
  tex.enableprimitives(). This change was planned for 0.40.0,
  but *now* is the time to test it.

* A bugfix for \primitive in various expandable contexts,
  and \primitive now generates an error message when the
  argument is not actually a primitive's name.

* There was a bug found in the math accent handling.

* Large math operators are now treated like extensible characters
  in the sense that they can be composed of segments.

* The extra assign- and restore tracing information from eTeX
  had a massive bug because of a dangling else in the pascal web.
  As a side-effect of fixing this bugs, all such potential errors
  in the pascal web have been fixed (for now).

* The math parameters can now be set and queried from lua code
  via the new tex.setmath() and tex.getmath() functions.

* Reflection in a \hbox was broken.

* There was a leak of direction nodes in the paragraph builder.

* The font backend now does a small peek to differentiate
  truetype and postscript style opentype fonts. This fixes
  the "Can't find CFF table" bug for otf's with truetype outlines.

* Parameters and registers can now also be assinged to globally
  from lua (see the manual for details).

* It is now possible to query the current math style while a
  formula is still being constructed by using the new read-only
  value \mathstyle. Associated is the new command \Ustack that
  is to be used as a prefix for {.. \over ..} and friends.
  See the manual for more information.

* The embedded MPLib is brought up to date with the current
  metapost repository (version 1.110 and a few small patches).

* Luatex can now handle two breakpoints inside a single ligature
  (like for the functional word of-f-ice). The solution is not
  perfect yet, but the chance of missed hyphenation points in
  actual documents should now be negligible.

* Some speedups in the font loading code, and in the handling of
  pdf_literal nodes that are set from within Lua code.

* Some source code and manual cleanup, as usual.

==============================================================
Luatex beta-0.38.0 was released 20090410
==============================================================

* tex.enableprimitives() had a bug were previously defined (but
  currently undefined) control sequences prevented the creation
  of the new csname.

* The special calling format callback.register('name', false)
  not only disables the callback, but also the builtin code it
  is supposed to replace.

* Empty \localleftbox and \localrightbox -es are now suppressed.

* Support for <f>.MathConstants.SubscriptShiftDownWithSuperscript
  was added, to solve the lack of "sub2" in OpenType math.

* Luatex now supports horizontal super- and subscript placement
  corrections via the OpenType MATH mathkern table. See the
  manual for details.

* node.write() no longer copies its argument node list before
  appending it.

* There are six new primitives that are verbose forms
  of one and two byte special tokens:
  \Usuperscript \Usubscript
  \Ustartmath \Ustopmath
  \Ustartdisplaymath \Ustopdisplaymath

* The attribute node leaks in math mode and alignmetns have been
  fixed.

* The 11 simple math noads are now combined into a single "noad"
  node type.

* Static linking against libstdc++ is working once again.

* There is a small fix in the keyword scanner to solve the
  problem of 'Runaway ... while scanning ???' that could happen
  for some primitives.

* Lua now also has the "architecture independent bytecode"
  patch applied.

* Lua is updated to version 5.1.4 with coco patches 1.1.5, and
  lpeg is now 0.9.

* Some TRT/TLT backend bugs are fixed.

* Various manual updates.

==============================================================
Luatex beta-0.37.0 was released 20090331
==============================================================

* Luatex now implements shell_escape = 'p', a new feature
  in web2c that intends to make \write18 more secure. As
  a side-effect, if luatex is used for typesetting, it will
  now also apply shell_escape = 'p' and shell_escape = 'f'
  to the lua functions io.popen(), os.execute(), os.exec(),
  and os.spawn().
  Nothing has changed for the case where luatex is used as
  a script interpreter.

* Attributes can now have negative values. The special value
  for 'unset' is lowered to -0x7FFFFFFF (it used to be -1).

* The lua 'kpse' library now has an object-oriented interface
  as companion to the procedural interface. This is useful for
  e.g. controlling the discovery of mplib files.

* The new internal integer parameter \outputbox allows setting
  of the output box number (default: 255, max: 65535)

* The new primitives \Udelimiterunder and \Udelimiterover
  complete the set of 'StretchStacks' for OpenType Math.

* Fixed a bug in font string conversions on the Macintosh that
  resulted in warnings about 'unaligned pointers being freed'.

* Khaled Hosny spotted a bunch of manual errors.

* There was bug in the width of math_accent objects when
  there were super- or subscripts attached to the accentee.

* In PDF mode, TRT \leaders were bugged.

* The source tree now uses the new texlive build system that
  Peter Breitenlohner created.

* There is now a single build.sh instead of four separate
  ones. It has a few options:
      --make      : only make, no make distclean; configure
      --parallel  : make -j 2 -l 3.0
      --nostrip   : do not strip binary
      --mingw     : crosscompile for mingw32 from i386-linux
      --ppc       : crosscompile for ppc osx on intel osx

  Note: --parallel still sometimes causes crashes due to
  timing errors, so use that option with care.

* Many compiler warnings have been removed (but not all yet).

==============================================================
Luatex beta-0.36.0 was released 20090323
==============================================================

* The included fontforge code is stripped considerably, and
  the lua table to access the code is renamed to 'fontloader'.
  The old name ('fontforge') will remain present for a while,
  but will eventually go away.

* New lua functions: tex.primitives(), tex.extraprimitives,
  tex.enableprimitives().  This is a prelude to a big change
  in the next beta: iniluatex will from now on start up with
  only the TeX82 primitives and \directlua, everything else
  has to be bootstrapped via tex.enableprimitives().
  See the manual for more details.

* Support for multiple lua states has been removed, and at the
  same time support for adding name ids to lua chunks has been
  added.  See the manual for more details.

* More changes to the PDF backend to make it support non-latin
  directions (form and image placement, vertical typesetting,
  synctex).

* The kpathsea library is updated. Highlights: cleaner build
  process (thanks to Peter Breitenlohner), cleaner mingw32
  (cross)compilation support, and a new reentrant API.

* Some possible endless loops within extended delimiters in
  math mode are now trapped.

* Movements inside VF font characters were considerably off
  due to a wrong conversion routine.

* Error handling for \outer has been reinstated, but can be
  suppressed via the new primitive \suppressoutererror.

* The new primitives: \suppresslongerror and \suppressifcsnameerror
  that can be used to suppress errors for \par in non-long macros
  and for non-expandable objects inside \ifcsname ... \endcsname,
  respectively.

* New lua function: node.vpack() via a patch from Khaled Hosny
  that also improves error handling in node.hpack().

* Fix the typo that caused \charic (instead of \charit)
  to be defined as a primitive.

* Suppression of hyphenation via \hyphenchar\font=-1 now works
  again.

* The lua functions tex.print(), tex.sprint(), tex.write() now
  accept an array of strings as well as vararg list of strings
  to print.

* A change to be build process: luatex.p is no longer split
  int smaller pieces before running the C compiler.

* Melissa O'Neill contributed a bugfix to the Type1 font
  subsetting code.

* A bunch of smaller bugfixes and cleanups (as usual).

==============================================================
Luatex beta-0.35.0 was released 20090224
==============================================================

* The math handling portions of LuaTeX are converted to C code,
  and extended to support Unicode math. There are a great many
  related changes, see the new Math chapter in the manual for
  details.

* A nasty bug in the paragraph breaking routine was fixed.
  (All lines except the first one were believed to be wider then
  they really were. This affected which nodes were considered
  as active breakpoints)

* Various changes to the PDF backend to make it support non-latin
  directions.

* Fixed the behaviour of the page offsets. Placement of the output
  on the physical page should now work correctly in all directions,
  both in DVI and PDF.
  There now are \pageleftoffset and \pagetopoffset primitives,
  as well as

* fontforge.apply_featurefile() was broken since 0.31.0

* The lua profiler library is added.

* The included lua filesystem library is now 1.4.1.

* Reading of pk files fixed.

* An optional space afer a <direction specifier> for \textdir c.s.
  is ignored from  now on.

* \bodydir and \pagedir can now be (re)set even after the first
  page has been output.

* The new callback mlist_to_hlist can be used to intercept the
  normal conversion of math lists to horizontal lists.

* The programs ttf2afm and pdftosrc are removed from the luatex
  distribution (these belong to pdftex).

* fontforge.open() now uses much less memory when opening large
  (CJK) fonts.

* The included libpng is now 1.2.35.

* Quite a lot of smaller bugfixes and cleanups (as usual).


==============================================================
Luatex beta-0.31.3 was released 20081229
==============================================================

This release has a bunch of updates from the development trunk
(#1657-1670,1677,1678,1680,1685,1687).

  * Closing of files opened by \externalocp.

  * Fix for a locale-related bug that make PDF generation fail
    with a "Parsing CFF Dict failed" message when including
    opentype fonts.

  * The included metapost is now version 1.102.

  * PDF rules in vertical modes in RL direction where output
    in the wrong direction

  * Fix for a crash on Apple fonts that contain a 'bsln' table.

  * The handling of the second argument to fontforge.open() was
    broken

  * The included libpng is now 1.2.34

  * Handling of ttc files on Windows was broken


==============================================================
Luatex beta-0.31.2 was released 20081209
==============================================================

Besides fixing building issues, this release has

  * A small fix for a crash that could happen when using
    external OCPs.

  * A fix in the format of fontforge.to_table output.
    (In 0.31.1 <font>.lookups was near-empty; the lookups
    were accidentally output as part of the gpos table).

==============================================================
Luatex beta-0.31.1 was released 20081209
==============================================================

fixed a bunch of compilation errors on various platforms, but
with no other visible changes.


==============================================================
Luatex beta-0.31.0 was released 20081205
==============================================================

This is just an intermediate release so that some testing can be
done on the updated fontforge embedding.

* There are new fields being generated by fontforge.to_table(),
  and one or two old ones have been removed. These fields are /
  will be documented in the manual, but very briefly:

  - MATH table and associated information are now exported
    (the main reason for the new fontforge code)
  - Baseline data is now exported
    (perhaps usable in lua code)
  - Multiple Master / Glyph variation data is now exported
    (but useless, for now)
  - Mac Feature (AAT) information is now exported
    (perhaps usable in lua code)
  - If (lookup) names were saved via the PfED table, these
    will the exported instead of the default, generated names.
    (as requested by Yannis)

* dfont is now treated as an archive format just like ttc
  when it comes to fontforge.info(). NOTE: that does not mean you
  can actually use them, because the  backend doesn't know
  yet how to embed dfont fonts in the PDF, that is on the
  TODO list for the next big beta (0.40.0).

* The executables are a lot larger than before. That is because
  much more of fontforge is included than before. Likely this
  will stay this way, because this makes upgrading the ff code
  much easier, and it means that luatex/FF potentially
  understands more font formats (after upgrading the backend,
  of course)


==============================================================
Luatex beta-0.30.3 was released 20081128
==============================================================

This release fixes a really big bug, a few smaller ones,
and has updates of png and mplib:

* All hyphenation patterns that were anchored at the start or
  end of a word were ignored in luatex versions 0.25.X and 0.30.X
  (and possibly even earlier).

* Repeated use of \language=-1 could result in "There is not room
  for another language".

* The lua true coroutines patch (Coco) is now disabled on OpenBSD
  running on non-intel platforms.

* The lua socket library is patched so that it will now compile on
  OpenSolaris.

* Luatex now has libpng 1.2.33 and mplib 1.100

==============================================================
Luatex beta-0.30.2 was released 20081020
==============================================================

* The Lua coco change from 0.30.1 is reverted as it gave
  trouble on MacOSX. Lua coco on non-intel OpenBSD platforms
  is now explicitly turned off.

* The lua file reading speedup in 0.30.1 broke reading of
  files larger than 100MB.

* Reading of font-related files was broken when there was a find
  callback, but no read callback.

* The texmf.cnf array size setup values were ignored whenever
  --lua was given on the commandline (instead of only when
  texconfig.kpse_init is set to false).

* glyphs with negative widths resulted in incorrect horizontal
  placement (overlapping) of the string in the output PDF.

* Using \latelua could sometimes result in an invalid output PDF,
  and the argument token list was expanded too early

* There was a read buffer overrun in the mapfile parser

* There are two new variables in the status table:
  status.callbacks and status.indirect_callbacks (execution counts).

==============================================================
Luatex beta-0.30.1 was released 20081009
==============================================================

* Invalid return values from the linebreak_filter callback
  are now handled gracefully (was crashing)
* a preinstalled ctangle is no longer needed except when
  cross-compiling
* In 0.30.0, the .notdef fix was incorrectly applied to
  truetype / opentype fonts.
* A bunch of all memory leaks is fixed
* In lua, f:read('*a') now uses signicantly less memory
* The number of \catcodetables is now limited to 64KB
  (for speed reasons)
* Luatex could crash if there were PDF images with and
  without page /Group included on the same page
* Lua coco now always uses setjmp (for OpenBSD compatibility)
* The embedded mplib is updated to the latest svn version
* # marks (characters with catcode 6) are no longer doubled
  inside \directlua
* Handling the nul character (U+0000) with catcode 13
  (active) was broken
* Luatex could crash on win32 with an access violation
  because there was one predefined language too few
  (the one matching \language=-1)

==============================================================
Luatex beta-0.30.0 was released 20080930
==============================================================

New features:

* Readable \tex internal params that are counts, attrs, or dimens are
  now returned as numbers instead of strings, and skips as node objects.
  Read-write access to tex's skip registers added: tex.skip[0] etc.
* new callback: 'linebreak_callback' to replace the internal paragraph
  breaking code
* the tex table now supports more readable 'convert' values:
  tex.fontname, tex.pdffontname, tex.pdffontobjnum, tex.pdffontsize,
  tex.uniformdeviate, tex.number, tex.romannumeral, tex.pdfpageref,
  tex.pdfxformname  (each takes a number as argument)
* new readable parameter: tex.fontidentifier(number) returns the
  \csname associated with that font id
* luatex now outputs \FONT<nr> instead of \^^@ in Overfull/Underfull
  messages if the font's id text is zero (like for expanded fonts) (#77)
 * luatex --version is split into --version and --credits
* There is now (again) an svn revision number in luatex --version (#91)
* Add support for more read-only internal access from lua:
  tex.lastpenalty, tex.lastkern, tex.lastskip, tex.lastnodetype,
  tex.inputlineno, tex.badness, tex.pdftexversion, tex.pdflastobj,
  tex.pdflastxform, tex.pdflastximage, tex.pdflastximagepages,
  tex.pdflastannot, tex.pdflastxpos, tex.pdflastypos, tex.pdfrandomseed,
  tex.pdflastlink, tex.luatexversion, tex.Alephversion,
  tex.Omegaversion, tex.Alephminorversion, tex.Omegaminorversion,
  tex.eTeXminorversion, tex.eTeXversion, tex.currentgrouplevel,
  tex.currentgrouptype, tex.currentiflevel, tex.currentiftype,
  tex.currentifbranch, tex.pdflastximagecolordepth (#81)
* the old --src-specials are replaced by --synctex (#63)
* the \expanded primitive is backported from pdftex 1.50 (#43)
* luatex now comes with libpng 1.2.32
* experimental: tex.definefont(string, number) associates a
  csname string with a font id number

Bugs fixed compared to 0.29.0:

* dashes were exported wrongly by MPlib
* multi-item \discretionaries were broken in various ways (#78, mailinglist)
* read_font_info was sometimes called recursively from lua-loaded
  virtual fonts
* do_vf was sometimes called on lua-loaded fonts that where
  already known to be virtual
* trailing junk in tfm files is now ignored (needed for ecrm fonts)
* pdf_ignored_dimen was initialized too late, breaking \prevdepth
  handling and causing output lines to overlap eachother (#72)
* pdf.immediateobj() had a printf-related bug
* the fontname terminal logging is fixed for strange font file names
* lua tex array assignments now listen to the globaldefs setting
  (tex.count[0] etc) (#92,partial)
* \parshape was broken (#70)
* there is no longer a ".tex" extension forced on very input file (#74)
* eof() for mapfiles was true one byte too soon (#76)
* out of range \lefthyphenmin and \righthyphenmin settings now actually
  disable hyphenation (#90)
* tex.unset_attribute() looked too far ahead when a to-be-unset
  attribute id not only did not exist in the node, but was also
  higher than the highest set attribute on the node. (#65)
* the parameters attr and page_name of read_image() were swapped
  (this broke \pdfimage with attributes)
* tex filenames with spaces in them on the command line are now
  allowed again (#30)
* sometimes pfb fonts were included multiple times without valid
  reason (#29)
* some parts of the pdftex 1.40.9 PNG transparancy hack were still
  present and caused transparant png handling to fail
* \localinterlinepenalty and \localbrokenpenalty were broken
* special case catcode tables are now handled better (#23)
* the handling of missing .notdef charstrings in old pfb fonts
  is fixed (#27)

==============================================================
Luatex beta-0.29.0 was released 20080718
==============================================================


New features:

* The embedded pdftex is now 1.40.9 (forthcoming) except for the
   following:
   - the png transparancy fix is skipped because it is in conflict
     with a macro-based solution offered by context mkiv.
   - LFS (PDF files > 2GiB) is not working yet.
   - Synctex is still missing

* libpng, xpdf, and zlib are updated to their pdftex 1.0.9 levels

* MPlib is updated to 1.090

* The syntax of buildpage_filter is changed to avoid confusion
   (and crashes). See the manual for the new calling convention.

Bugs fixed compared to 0.28.0:

* The previous bugfix for \languages skipping numbers was wrong.

* Various compile-time warnings are suppressed

* \pdfsetmatrix was broken

* \pdfsave and \pdfrestore were broken

* Valid user_defined whatsits nevertheless were generating errors.


==============================================================
Luatex beta-0.28.0 was released 20080630
==============================================================

There is one new feature:

There is now experimental support for non-trivial discretionaries
following explicit hyphens. In analogy to \prehyphenchar and
\posthyphenchar, there are two new parameters \preexhyphenchar en
\postexhyphenchar. Both new parameters default to zero (nothing).
When set to a nonzero value, the parameter is added to either the
pre- or post- break text. Note that this is *in addition to* the
hyphen already in the input. Testing and comments are very welcome.

Here is a short example (no idea what is says):

   \pdfoutput=1
   \hsize=2in
   \postexhyphenchar=`-
   Seria bom se eu
   pudesse t\^e-lo mantido como amigo, mas por
   mais bem-intencionado que eu fosse, n\~ao
   foi possivel
   \bye



Bugs fixed compared to 0.27.0:

* Words that started off with a character with a zero \lccode
   were never hyphenated at all.

* There was a bug in the new active characters code that prevented
   the latex format from being built (with Invalid character error).

* There is a temporary fix for the sometimes appearing "Font has a
   bad FontBB" message from Acrobat.

* \leaders did not actually stretch enough (the last bit of glue
   that has to line up the line endings was never output to the PDF).

* Bad paragraph-related callbacks could result in luatex crashing.

* The pre_linebreak and post_linebreak filters were never called
   when \output was active (this was a leftover of a superceded
   optimization).

* 'skipping' language codes when setting up \patterns c.s. did not
   work (it used the next empty slot instead of the actual value of
   \language).

* Using multiple 'attr' keywords on box items could cause random
   crashes.

* Calling lang.hyphenate() with one argument (without specifying a
    tail node) could crash.

* The luatex pdf banner and version reporting is cleaned up a bit.

* Conflicting patterns inside \patterns now give an error:
     ! Conflicting pattern ignored.
   (duplicate identical patterns are ignored without error).

==============================================================
Luatex beta-0.27.0 was released 20080624
==============================================================

Bugs fixed compared to 0.25.3:

* Unicode reencoding support for non-standard (i.e. older)
   Type1 fonts is now somewhat less broken than it was (#25)

* .vf fonts using specials crashed luatex

* luatex would crash on --\par (#33)

* An attempt is made to get a sane default value for StemV in
   the created pdf (#32)

* We can now guarantee that %PDF-1.* header is printed before
   the first pdf.print() output

* lang.hyphenate() was broken

* insert_before(a,a,b) was broken (#37)

* argv[0] is now cleaned up before being used as a default for
   mem_name and prog_name (#28).

* luatex would crash on loading extended fonts (fonts loaded
   via lua callbacks) from a format file.

* The fix for pdftex bug #799 is backported from pdftex 1.40.4.

* slnunicode had a bug in the unicode.utf8.gmatch iterator.

* Queries of nonexisting fontdimens could cause a crash.

* luatex would crash on {\textdir TLT\pardir TLT x\break\par }

* Fixed wrong placement of lines in mixed-direction paragraphs
   that could happen in some situations.

Other news:
* Luatex now includes luasocket (#35)
   See http://www.tecgraf.puc-rio.br/~diego/professional/luasocket/
   for usage.
   There is a new commandline option: --nosocket to disable this,
   and that is also implied by --safer.

   NOTE to the binary builders: there are some unfixed configure
   problems when you need to add a specific library to get socket
   support on your platform. You probably will have to edit the
   generated Makefile by hand (search for 'socketlib').

* There is ongoing development to the 'img' and 'mplib' libraries.
   See the reference manual for details.

* The 'character commands' in virtual fonts now support image
   inclusion. See the reference manual for details.

* Lua error messages now include the call stack.

* \directlua and \latelua have been extended to accept a 'name'
   keyword. The argument is a token list that is used as the lua
   name of this chunk in lua error messages and call stack prints.
   (#42)

* The lua chunk names can be interfaced via a new virtual
   table called lua.instancename, the values in that function as
   defaults in the absence of 'name' keywords.

* The 2-plane limit on active character range is removed (#12).

* Subsetted TTF fonts in the PDF now retain the cmap table.

* There is a new Lua variable os.selfdir. This contains the
   full absolute pathname of the directory that the executable
   resides in (with symlinks resolved)

* There is a new function os.uname() this returns a lua
   table containing various platform information items.

* The node library now uses text strings for direction specifiers
   instead of numbers. See the reference manual for details.

* The 'E' (edit) as error response functionality is now a noop.

* Adding luatex 0.25.3 to texlive resulted in a few minor backports,
   in particular: Support for mktexfmt is added, and luatangle now
   identifies itself as such (instead of calling itself otangle).

* We fixed a whole series of portability problems (but
   we probably introduced new problems as well).

* Most (all?) files now have a corrected Copyright header,
   and link in $Id$ and  $URL$ into the object file.

* Some unnecessary files were removed from the distribution.

==============================================================
Luatex beta-0.25.3 was released 20080418
==============================================================

Bugs fixed:
* Pdftex bug no. 936 (sarovar) regarding vertical
  positioning of embedded PDF files if depth parameter is given.
* Luatex gave bogus lua return values for the tex.wd/hd/dp
  values of void boxes
* A few bugfixes in mplib (square pens caused hangs, elliptical
  pens caused confused output)
* Hyphenation of uppercase words (\uchyph) was broken
* Output image placements corrected for all 8 transform cases
  also when artbox etc. is used
* There were missing maketexstring() calls in error messages
* Math display contents were sometimes prematurely freed during
  the placement of the equation number
* Setting \language=-1 could cause crashes due to an array
  index going out-of-bounds

Other news:
* build.sh.ppc is added to the source distribution. This is a
  script that crosscompiles osx ppc binaries from osx intel
* tex.box[<chardef name>] is now supported (but still experimental)
* a bunch of compiler warnings are removed
* The fontforge library now dump AAT feature tags as and
  "<id,flags>" string
* The new function font.nextid() predicts the next assigned font id
* Some source code changes are backported from texlive

==============================================================
Luatex beta-0.25.2 was released 20080410
==============================================================

* Updated to MPlib 0.40
* Bugfixes and cleanup in the lua img table code
* Fix \pdflastximagepages bug from pdftex
* Fix for very large tex.print strings
* Update to Lpeg 0.8.1
* &D Bugfix for Type1 fonts when out-of-range characters
  are marked as 'used'

==============================================================
Luatex beta-0.25.1 was released 20080321
==============================================================

* Updated to MPlib 0.30 (that is now becoming usable)
* The build requirement for a pre-installed ctangle is gone
  (thanks to Martin)

==============================================================
Luatex beta-0.25.0 was released 20080311
==============================================================

New:

* mplib library:
   This version features an embedded MP interpreter whose output
   can be directly accessed from lua code (mplib), without calls
   to an external "mpost" command. Of course it has bugs and
   limitations (makempx does not work, for example) but keep in
   mind that it is only an initial attempt.
   See the manual for more details.
* img library:
   ** img.immediatewrite() is added
   ** images now accept a 'transform' key
   ** widths etc. can now be given as width="100mm"

Fixed:

* \parshape handling was completely broken since 0.20.0+
* when \pdfprotrudechars was in effect, an assertion failure
   could happen when embedded \hboxes in the paragraph appeared
   at the end of a line.
* import of otf fonts with contextual lookups has been debugged,
   thanks to a patch by GW himself.
* compiling with gcc 4.2.3 is now supported
* if you want to build from source, you need a pre-installed ctangle.


==============================================================
Luatex beta-0.22.1 was released 20080227
==============================================================

* The macnames.c source file for building ttf2afm is restored.
* "make depend" in luatexdir now works again
* luatex sometimes crashed because it attempted to expand an
  already expanded font
* luatex aborted when --progname was given but no format name.
  It now sets the format name to the given progname in that case
* sometimes paragraphs with near-empty lines could cause a crash
* img.supportedtypes() had a bug causing it to crash
* img.supportedtypes() has been renamed to img.types for consistency
* img.boxes() added, returns strings representing bounding boxes
* img.node() added, returns a whatsit node cf. \pdfrefximage
* node.write() now accepts multiple arguments
* the program_name_set switch was not set automatically from C,
  causing errors unless lua code called kpse.set_program_name()
  explicitly
* kpse.set_program_name() can now be called more than once
  in a single run.
* os.spawn{...} and os.exec{...} could cause crashes because of
  a memory allocation error

==============================================================
Luatex beta-0.22.0 was released 20080215
==============================================================

* We now have an official bug tracker: http://tracker.luatex.org
* A new lua library (img) is added that allows a direct
   interface to the image handling of luatex. You can use this
   to include images from lua code instead of via the more
   traditional \pdfximage cs. See the manual.
* An optional equal sign after \{pre,post}hyphenchar is now
   allowed.
* os.exec() has been extended, and os.spawn() added. These
   functions have support for quoted strings, and they
   also accept a table with preseparated command arguments.
* New string constants os.type and os.name are provided.
* node.last_node() is added. This pops and returns the last
   node from luatex's 'current list'
* node.write() is added. This appends a node to the end of
   luatex's 'current list' (experimental).
* The strict check on unicode compliance in pattern files
   is dropped. Patterns files still have to be in proper UTF-8
   encoding, but the error for non-Unicode character values
   (like 0 - 31 and 127 - 159) is dropped.
* \pdfadjustinterwordglue, \prependkern, \appendkern
   and associated \XXXXcode arrays are gone.
* The rest of the pdftex font arrays are now merged into
   the new luatex font data structure. This means that you
   can now set up font expansion from lua code, and that a few
   font-related limits are gone.
* The 'top_skip' field in 'insert' nodes is renamed to 'spec',
   for improved consistency.
* kpse.show_path() added. This behaves just like
   $ kpsewhich --show-path
* The unicode.utf8 functions now also accept values in the range
   1.114.112 - 1.114.367 that is used by LUATEX for raw byte output.

What's been fixed:

* Better node memory (de)allocation error tracking and messages
* Compilation on MacOSX 10.5 was broken
* There was a bug in node.insert_after
* Use of \{pre,post}hyphenchar was broken
* lfs.permissions was leaking memory
* Some warning and error messages are improved a bit
* A set of bugs in character protrusion, this seems to be working
   ok now.
* Also, a set of bugs in font expansion. This now works in most
   cases but is not quite bugfree yet (problematic files for testing
   are welcomed).
* The functions in the kpse library would crash luatex if
   kpse.set_program_name() was not yet called. gives an error now.
* Alignments with spanned columns could cause crashes
* A patch is added for problems with filename parsing on the
   "first input line" (by Jonathan Kew)
* The hpack_filter and vpack_filter were only called for lists longer
   than one node.
* Luatex is now more forgiving about font subsets being smaller
   than their expected size (issues a warning instead of aborts now)
* A "double-free ignored" error for paragraphs with lines starting
   with discarded items was fixed.

==============================================================
Luatex beta-0.20.2 was released 20071217
==============================================================

* some portability fixes to the build scripts
* a fix for multi-\span in alignments causing unbreakable
   loops
* manual improvements from Jonathan Sauer
* fix for undefined csnames in \directlua if
   web2c's hash_extra is nonzero
* fix for LR text inside of a RL document
* fix for open_read_file callback not being called
   unless find_read_file was also registered
* removed the ocp status message when \ocps are not
   actually used
* "unicodeenc" in the fontforge to_table renamed to
   "unicode" for improved consistency

==============================================================
Luatex beta-0.20.1 was released 20071207
==============================================================

* texlua was broken on Solaris because the some C header
   files were loaded in the wrong order.
* os.tmpdir() now accepts an argument, making it easier
   to use. It now generates more unique filenames when
   it is called repeatedly in one run.
* The --luaconly commandline switch is now documented
   in the --help text.
* The new extended hyphenation exceptions were severely
   broken.
* \pdfprotrudechars could cause luatex to abort with an
   assertion failure.
* There was a bug in the  \span code that could cause endless
   loops.
* The simple forms of \leaders were messed up on windows
   because a variable was not properly initialized.
* Non-grouped \textdir commands created invalid output.
* e-TeX's pseudo files were not closed properly in ini mode.
* The luatex.web now weaves properly again.
* I made some small improvements to the manual.

==============================================================
Luatex beta-0.20.0 was released 20071205
==============================================================

News compared to the last beta (0.11.2) is as follows:

* Completely overhauled hyphenation and ligkern application,
  including the addition of a new "lang" table in lua to
  interface to the language parameters, some extra functions
  in the "node" table, and a few extra callbacks ("hyphenate",
  "ligaturing", "kerning", "post_linebreak_filter").

  There is a new chapter in the manual to document all the
  changes to the hyphenation and line breaking algorithms,
  it is simply too much to list here.

* the interface of the pre_linebreak_filter,hpack_filter,
  vpack_filter, and pre_output_filter has changed slightly.

* boxes can now get explicit attributes different from the
  currently active set, using a syntax like

  \hbox attr2=12 attr3=-1 to 12pt {Hi!}

* lpeg is now at version 0.7

* a whole series of exotic bugs and compiler warnings are
  fixed, mostly thanks to the watchful eye of Fabrice.

* texio.print now accepts multiple strings as arguments.

* the lua functions os.sleep(), os.times(), os.gettimeofday()
  and os.tmpdir() have been added.

* lua now comes with the coroutine (coco) patches from the
  luajit project applied.

* the banner line no longer claims to be TeX.

* a bunch of bugs reported on the mailing list have been
  fixed (I hope all of them).

* (internal) we found lots of small ways to speed up lua
  node processing.

* (internal) the node (de)allocation functions have been
  rewritten, so that absolutely all nodes now have a type,
  even the ones with variable sizes.


==============================================================
Luatex snapshot-20071029 was released 20071029
==============================================================

* Completely overhauled hyphenation and ligkern application.

  There is a new chapter in the manual to document all the
  changes to the hyphenation and line breaking algorithms,
  it is simply too much to list here.

* the interface of the pre_linebreak_filter,hpack_filter,
  vpack_filter, and pre_output_filter has changed slightly.

* lpeg is now at version 0.7

* a whole series of exotic bugs and compiler warnings are
  fixed thanks to the watchful eye of Fabrice.

* texio.print now accepts multiple strings as arguments.

* The lua function os.sleep() is added

==============================================================
Luatex beta-0.11.2 was released 20070918
==============================================================

* Pdf inclusion and subsetting of CID-based opentype fonts
  now works as it should.

==============================================================
Luatex beta-0.11.1 was released 20070918
==============================================================

A quick list of what is new and fixed since beta 0.10.2:

New:
* pfb+afm fonts can now be used in 'wide' (encodingbytes=2) mode
* searching in PDFS using 'wide' fonts now works reasonably well
  (based on the tounicode feature)
* related to that, tounicode information can now be passed
  on inside the font metrics table
* font subsetting is now supported for CID-based OpenType fonts
  (however, there is a known bug with KpozMinProVI-Regular.otf)
* fontforge's warning and error messages are now intercepted
  and passed on to the lua code as a second return value of
  the fontforge.open() function
* the new primitive \suppressfontnotfounderror can suppress
  the TeX error for "Font not found"
* The lua function font.current can now be used to set TeX's
  current font

Fixes:
* set_attribute(-1) is now the same as unset_attribute()
* OpenType lookups with glyph classes would crash luatex
* luazlib would not compile on debian (fix from Norbert)
* CID-based fonts would crash luatex
* Bare CFF should be read in binary mode (fix from Akira)
* VF processing did not process packets containing zero bytes properly
* the truetype collection (.ttc) handling is fixed, so that all
  of the fonts inside a collection can now be used reliably
* application segfaults and stack overflows are intercepted
  so that luatex can quit a bit more gracefully
* an assertion failuer on systems with signed chars (linux-powerpc)
  is fixed
* a crash on AMD64 linux was fixed
* the lua "pdf" table code was wrong
* \ifcsname did not work properly for UTF-8 characters
* Use of the math-related functions using make_fraction (like \atop)
  caused a crash
* \handling of \if\noexpand was wrong
* applied a patch that cleans up XForm and page calculations
* "autoconf" support from zziplib is stripped

==============================================================
Luatex beta-0.10.2 was released 20070814
==============================================================

Bugs fixed:

* the primitive \span was completely broken
* \pdfexpandfont (font expansion) misbehaved if it was used more
   than once
* virtual fonts: sometimes they used the wrong internal font id,
   loading vf fonts via fonts.read_vf() was impossible, and sometimes
   virtual fonts created segfaults
* while dumping formats, the last font parameter for each font was not
   dumped at all
* zziplib was always compiled with pre-installed zlib headers, instead
   of the ones in the build tree
* lua 5.1.2 has trouble quoting ^Z characters etc, the tentative patch
   for lua 5.2 from Luiz fixes that, hopefully
* fontforge.font('font.pfb') now properly parses AFM boundingboxes
* non-existing files in the argument for fontforge.open() or
   fontforge.info() could cause segfaults, now it generates an error
   instead
* fontforge.open() did not return character widths for vertical fonts
   as it should
* on Windows, fontforge believed that ttc files (TrueType Collections)
   were actually directories. ttc processing is still not 100% correct,
   but it is getting better
* the build system used explicit 'make' sometimes
* the auto-growing string pool was not used everywhere
* there were some typos in the documentation parts of the pascal web
* use of \parshape could easily exhaust all available memory


New features:

* support for applying Adobe Feature files (.fea) and Adobe Font
   Metrics (.afm) is added to the fontforge library
* fontforge.info() will now return an array of tables for the contents
   for ttc files
* support for a 'texluac' personality was added, to replace the 'luac'
   command from the official Lua distribution

==============================================================
Luatex beta-0.10.1 was released 20070719
==============================================================

This was a hotfix because beta-0.10.0 was completely broken.

==============================================================
Luatex beta-0.10.0 was released 20070718
==============================================================

The latest version of the manual is included in the package, and I
am not going to repeat all of that. There were some minor changes
compared to the previous snapshot, but mostly just bugfixes and
documentation improvements.

==============================================================
Luatex snapshot-20070626 was released 20070626
==============================================================

* Integrated the lua library lzlib, this defines tables with
   bindings for zlib (including eazy-to-use gzip support)
* Updated to slnunicode version 1.1
* Some small cleanups in the sparse array handling
* Moved the raw byte support out of the valid unicode range
* Fixed a bug in the OFM font reader
* Removed the pdftex snap nodes (and associated primitives)


==============================================================
Luatex snapshot-20070622 was released 20070622
==============================================================

Not a lot of news, but it fixes a few important bugs in the lua
node processing. Also a few utility functions are added:

* tex.round()
   rounds and bounds checks a lua number to make sure it is
   a valid tex integer.
* tex.scale()
   multiplies a number (or the numeric values in a table)
   with a fixed quantity, and calls tex.round() on the result.
* node.has_field()
   Test if a node has a specified field name
* node.remove()
   removes a node from a nodelist, while keeping the list intact
* node.insert_before()
   inserts a new node into a nodelist, just before a specified
   location node
* node.insert_before()
   inserts a new node into a nodelist, just after a specified
   location node
* node.hpack()
   packages a nodelist into a hlist node


==============================================================
Luatex snapshot-20070619 was released 20070619
==============================================================

* The lua node processing interface is completely reworked.
   It is now completely based on userdata, and uses a new lua table
   called 'node' to hold the methods. More detailed information
   is in the manual (of course).

* There is a fifth node processing callback:
      pre_output_filter
   this is executed just before the packaging of \box 255.

* The hpack_filter and pre_linebreak_filter callbacks now
   receive an extra argument indicating the number of top-level
   glyphs in the node list.

* Virtual fonts can now contain a 'node' key in the glyph
   commands: the value should be a hlist node (i.e.: a horizontal
   box), and that will then be output for each character access
   in that font.

* A new set of registers is added, called \attribute. These are
   values that will be automatically attached to nodes created in
   their scope. More information in the manual.

* Direct read/write access to TeX's box registers is addded to
   the lua 'tex' table.

* TeX's main memory now grows dynamically, and the (de)allocation
   routines have been rewritten completely.

* The 'kpse' table is extended with extra interface functions, to
   allow texlua to be used as a scripting engine.

* The \pdftexversion command now returns 200, not 140.

* The displayed banner and --version screens are cleaned up.

* The format file is now RLE compressed. Not as small as before,
   but unpacking is much faster.


==============================================================
Luatex snapshot-20070426 was released 20070426
==============================================================

This past month I have been busy with nodes and lists of nodes,
so the big new feature in this release is that there are four
callbacks that operate on node lists:

  buildpage_filter
  pre_linebreak_filter
  hpack_filter
  vpack_filter

The preliminary documentation for these is in the manual, but the basic
idea is that you can filter a node list just before LuaTeX starts doing
something with it (like line breaking). This functionality is not stable
yet: the node presentation of the various node types is pretty much OK
now, but keep in mind the following:

  * math noads and math typesetting are not handled at all (yet)
  * not all hpacks and vpacks are intercepted (yet)
  * the nested node list handling will probably change
  * A conversion tool for nodes to/from dictionaries is planned,
    but not done yet

The other changes in this snapshot are various bugfixes (for builds
on various platforms as well as font issues) and speedups (in the
execution of callbacks and the creation of lua font representations).


==============================================================
Luatex snapshot-20070322 was released 20070322
==============================================================

* I have changed the token_filter callback quite rigorously,
   mostly because of speed issues. The raw speed of trivial
   lua token handling is now only about 20 times slower than
   the native handling. Not bad at all, considering it has to move
   between interpreted and compiled code for each and every
   token. If you do not run the token filter inside \output,
   the effective run speed difference should not be much more
   than a factor 1.5.

   Two big differences: you have to call token.get_next()
   yourself, and the token table is now a three-item array
   instead of a five-key hash. The minimal example changes to

   \directlua0{
     callback.register('token_filter', function ()
       return token.get_next()
       end)
   }

   more details are in the manual.

* I've fixed a few bugs in the handling of Opentype TTF, and added
   a new key in the font definition table:

      f.encodingbytes = (1|2)

   The default is 2 for opentype and truetype format, 1 otherwise.
   Later on, it will become possible to have a type1 font in 2-byte
   (CID) encoding or a truetype font in traditional encoding (1-byte),
   but I have not covered all cases yet.



==============================================================
Luatex snapshot-20070309 was released 20070309
==============================================================

* The OCP debug information is removed again.

* There is a new callback that I am quite excited about myself:
   'token_filter'.


A bit of text from the reference manual:
--------------------
This callback allows you to change the modify any lexical token that
enters the \type{main_control} function before \LUATEX\ executes the
associated command.

Note: not all tokens can be intercepted yet, only those that are `seen'
by \LUATEX's main control function.  Supplemental tokens like the bodies
of macro definitions and the right-hand side of register assignments
are not seen. For now, this is intentional.

\startfunctioncall
      function (table <token>)
         return table <token>
      end
\stopfunctioncall

Calling convention for this callback is bit more complicated then for
most other callbacks.  Initially, lua function will be called with the
next token from \type{get_next()} as argument, represented as a small
lua table.  The function should either return a lua table representing
a valid to-be-processed token, or something else like nil or an empty
table.

If your lua function does not return a table representing a valid
token, it will be immediately called again with yet another token
from \type{get_next()} as argument, until it eventually does return
a useful token.

But if the function does return a usable token, then that token will
be processed by \LUATEX. Afterwards, the function will be called
again, but now without an argument. This is repeated until it stops
returning tokens.  Then processing reverts back to the other branch.

The point behind that roundabout calling convention is that it
allows the lua function to buffer tokens for various uses. That in
turn makes it possible to do some really advanced things like
replacing OTPs.

Now about that table. The table that the function will receive
contains four fields:

\starttabulate[|l|i|p|]
\NC Key     \NC  type    \NC                Explanation \NC\FR
\NC cmd     \NC  string \NC A representation of  \LUATEX's internal
                             command code\NC\NR
\NC chr     \NC  number \NC The command code modifier\NC\NR
\NC cs      \NC  string \NC If the token came from a csname, this
                             is  that csname\NC\NR
\NC mod     \NC character \NC A single character string representing
the current processing mode. One of {\bf v}ertical, {\bf h}orizontal,
display {\bf m}ath, {\bf n}o, internal {\bf V}ertical,
            restricted {\bf H}orizontal, or inline {\bf M}ath mode.\NC\LR
\stoptabulate

If you modify the table before returning it, then it is wise to return
either a (\type{cmd}, \type{chr}) pair, or a \type{cs} string.  That is
because if both options are present, the pair has precedence and the
string is ignored. On the return table, {\bf mod} is ignored always.
--------------

I have no long example code yet and it is not as complete as one
would want it to be because it is not intercepting everything that
comes in, only the bits that are triggered by the main control
loop.

I decided to do a fast snapshot release for two reasons:

* It is one of the easier extensions to get started with if you want
   to learn a bit about lua programming

* I would welcome feedback on the token interface, because it will
   be needed in other places as well, soon. I am still not sure
   whether converting the command to/from strings is worth it, for
   example. And maybe it would be less confusing if you could return
   a list of tokens instead of being called repeatedly?

Here is the trivial example to get you started:

    \directlua0{
      callback.register('token_filter', function (t) return t end)
    }


==============================================================
Luatex snapshot-20070307 was released 20070307
==============================================================


* Non-CID PostScript-based Opentype fonts are now combined over
   the entire document, and properly subsetted. The code is
   borrowed from xdvipdfmx with some minor adjustments

   Adding support for CID-keyed OpenType fonts would not be hard
   but at the moment I lack example input (and incentive).

* A small extension to the virtual fonts structure: you can use

     f.fonts[1] = { 'id' = 38}

   to do a backreference to a previously defined font. This saves quite
   a few computations

* There was a bug in the handling of \leaders in the output whereby
   it's width was taken to be twice what it should be while writing
   to the PDF, fixed now.

* The font inclusion code is cleaned up a bit by Hartmut.

* Some compilation problems were fixed.

* There is (quite a bit of) debugging information printed out when
   OTPs are in use, because I am tracking down a bug reported by Idris.

   The input of each and every OTP step is shown on the terminal in
   a line line this:

     [57902][1568][58423][1568][58408][1568][58921]

   those are the decimal values of ocp i/o characters. If you don't
   need them, don't worry about it.

==============================================================
Luatex snapshot-20070302 was released 20070302
==============================================================

* The 'snapshot version' banner is now calculated dynamically
  at build time. This aids in figuring out what binary people
  are actually running, but it can possibly break the build on
  systems that do not have a `date` command.

* The do_vf() function that checks for virtual font existance
  is now run immediately after the font definition instead of
  being postponed until characters are output.

* The 'define_font' callback interface has changed a little.
  It is now:
    retval = function (name,size,fontid)

  where fontid is the internal font number of the font that
  is currently being defined, and retval can be either a table
  (as before) or a different, previously defined fontid. This is
  useful if a previous definition can be reused instead of
  creating a whole new font structure.

* The internal font data structure has been redone. Glyph index
  inside a font is now handled by a sparse array, so that use
  of e.g. 0xFB01 (fi-ligature) no longer creates a 64000+ entries
  character array.

* The internal cache-ing of font metric information is turned
  off completely, because it was based on the assumption that
  name + size were a unique identifier for a font. This can no
  longer be guaranteed.

* word boundary processing now works OK again, thanks to the
  introduction of two virtual characters in the font table
  definition. Besides the normal numeric entries in the
  f.characters table, there can now also be two string keys:
  "left_boundary" and "right_boundary". The  ligatures and kerns
  of the 'left_boundary' character are used for the pre-word
  boundary processing, ligatures and kerns between characters
  and 'right_boundary' are used for the post-word processing.

* Lua font table references are no longer cached by the
  executable ,in order to preserve memory. (the only downside
  is that font.fonts[] access is now slower because of the need
  to recreate the lua table).

* There are other some small changes to the font table formats.
  Please see the manual for details.

* A 'real' font can now still have virtual characters if they
  are loaded via lua. Just set the 'commands' section and/or
  the 'fonts' array to your liking, and it should work out.

  If you have created no 'fonts' array at all, then the default
  font (indentifier '1')  is the current font, so that you
  can create virtual duplicates of already existing characters.

  Note: this does not work the other way. There can not be
  'real' characters in a virtual font!

* Truetype-based opentype fonts no longer require Acrobat 7
  t(hey are now written out as if they are normal truetype).

* A lua init script can now set 'texconfig.formatname' and/or
  'texconfig.jobname'. If ther is no file or format specified
  on the commandline, then, if, one of those keys is present,
  that key will be used instead of simply quitting with an
  error.

* Placement of boxes and rules in right-to-left mode is debugged,
  and now seems to work ok.

* Virtual font loading is debugged.

* Some memory leaks are resolved

* HZ font expansion should work ok again, but is not tested.

* a few of the warning during opentype loading have been removed
  because the problems are rather harmless and turned out to be
  triggered by almost every font.


==============================================================
Luatex snapshot-20070218 was released 20070218
==============================================================

* The pdftex stuff is now updated to 1.40.3
  (and on top of that, it still has those extra patches announced in
  snapshot 20070202)

* The virtual font parser is debugged and now appears rather stable.

* There is one extra virtual command:

    "commands" = {
       {"slot", 1, 97}, -- place character 97 'a' in local font 1.
     }

  This is just a shortcut for {"font",1}, {"char", 97}

* Some small memory leaks have been fixed. Luatex does not leak big
  time, but I'd like to get back to valgrind reporting '0 out of 0',
  instead of the current 800 bytes or so (that is a slow process).

* You can read a truetype or opentype font from within lua code
  using font.read_ttf() or font.read_otf(), respectively.

  This feature uses a fair bit of the fontforge code, making the
  binary rather a bit larger than before. Just so you know.

  Apple (AAT, as well as encoding) support is still largely missing,
  and bitmap-only and old Multiple-Master truetype fonts are not
  supported at all (and never will be).

  The output format is (shadily) documented in the reference manual.
  At the moment, it very closely resembles the internal font stucture
  that is used by fontforge.

* LuaTeX can now write wide OpenType fonts to the PDF file.

  There is no subsetting support yet, and a ToUnicode CMap is also
  still missing, but nevertheless it is already somewhat useful. The
  rule is very simple: if a font uses code points above 255, then it
  is considered to be a `wide' font, and it will be written out as
  a Type0 CID-keyed font to the PDF.

  Caveat: Getting suitable metrics into LuaTeX can be a bit of problem
  right now, because font.read_otf() does not produce anything that
  can be fed back into define_font without extra processing.  Hans has
  some experimental Lua code for ConTeXt (of course :-)) and that is
  how I know it works.  You can expect a nicer interface soon,
  hopefully next week, in the form of a simplistic table conversion
  routine.

* I have started work on supporting Aleph's bidi typesetting in PDF
  mode as well, simple text seems to be largely ok. More complicated
  documents will no doubt still show some bugs, but fixing those will
  be easy (once they are discovered). Exactly what happens with specials
  is not yet investigated.

* Omega's (16-bit) wide virtual fonts now work OK in PDF mode. This
  means that many Aleph files can now be run in PDF mode directly.
  (the documents that use UTF-8 input encoding)


==============================================================
Luatex snapshot-20070202 was released 20070202
==============================================================


* The pdftex stuff is now updated to 1.40.2, and on top of that, it has

   - an extra patch from Han The Thanh that adds a primitive to control
     the merging of fonts from external pdf images (\pdfreplacefonts),
     and a bugfix for virtual font handling.

   - an extra patch by Hartmut Henkel that removes a number of malloc()s
     and free()s from the calls to the compression library, thereby
     making luatex run a bit faster.

* luatex now happily accepts the following low-level syntax:

    \font\myfont = <general text> <at specifier>

   It feeds the <general text> to either kpathsea or a lua script for
   further processing after stripping the braces.

   In itself, this is not all that useful, but the reason for this
   syntax extension is that it paves the road for a macro package
   to do something like this:

    \font\myfont = {font="Times New Roman", color="\darkred",
                    encoding="ec", features="liga", size=10bp}

   without having to resort to system-specific quoting mechanisms.
   Macro (and other) expansion takes inside the braced argument.

   (I am considering adding this extension to \input as well).

* It is now possible to define a font into the font.fonts[]
   directly from lua, but becayse use is limited, I am only
   mentioning it to be complete.

   Syntax:
        <number> id = font.define(<table> font)

* There is a (not very reliable yet) virtual font parser accessible
   from lua.

   Syntax:
        <table> vfdata = font.read_vf(<string> name, <number> size)

   The interpreter tries to give a reasonable representation of a
   virtual font file (the .vf file). Besides a few simple top-level
   items:

     designsize  -- in scaled points
     size        -- also in sp
     name        -- the file name
     checksum    -- the vf checksum
     header      -- the header comment  (if any)

   it also has a top-level array 'fonts' wherein each item is a mini-
   array describing one of te mapped fonts. An example makes this
   easy to understand

    "fonts" = { {"ptmr8a",655360}, {"psyr", 600000} }

   says that the first referenced font (index 1) in this virtual font
   is ptrmr8a.tfm loaded at 10pt,  and the second is psyr.tfm loaded
   at a little over 9pt. These index numbers are used by the character
   command definitions that follow.

   At top level, there is a 'characters' array, just as for a normal
   font, except that each item has only two keys:

     "width"    -- the tfm width (as stored in the .vf)
     "commands" -- an array of virtual font commands for a character.

   each of the items in the 'commands' array is itself a tiny hash.

   Each of those mini-hashes represents a single character packet
   command. Here is a 'commands' entry that contains every possible
   one at least once:

     "commands" = {
        {"push"},                     -- remember where we are
        {"right", 5000},              -- move right 0.08pt
        {"font", 1},                  -- select the fonts[1] entry
        {"setchar", 97},              -- place character 97 'a'
        {"pop"},                      -- go all the way back
        {"down", -200000},            -- move *up* about 3pt
        {"special", "pdf: 1 0 0 rg"}  -- switch to red color
        {"rule", 500000, 20000}       -- draw a bar
        {'special',"pdf: 0 g"}        -- back to black
      }


* But the big news is that you can now define your own virtual fonts
   on the fly, by adding a few statements to the table returned to
   the 'define_font' callback.

   There are a few requirements:

   - The table has to have a top-level key 'type', and it's value
     must be 'virtual'.

     The presence of this key with the specific value 'virtual'
     will trigger handling of the rest of the special virtual font
     fields in the table, but the mere existance of 'type' is
     enough to prevent luatex from looking for a virtual font
     on its own.

     Therefore, this also works 'in reverse': if you are absolutely
     certain that a font is not a virtual font, assigning the value
     'base' or 'real' to 'type' will inhibit tex from looking for a
     virtual font file, thereby saving you a disk search.

   - There must be a top-level 'fonts' array, as explained above.
     Any fonts that are not yet known to luatex at that moment,
     will be loaded automatically (Warning: do not ever use a font
     in 'fonts' with the same name you will return in the table you
     are defining right now!).

   - Each and every character in the fonts needs to have a 'commands'
     key, as explained above.

   The main point behind these restrictions is that a font is
   *either* a base font *or* a virtual font. It cannot be both
   at the same time.


==============================================================
Luatex snapshot-20070126 was released 20070126
==============================================================


* Underscores in pascal identifiers are now retained.

   This took quite a bit of work. The web2c conversion tools
   needed only small adjustments, but most of the existing C
   code depended on the removal of the underscores. I had to
   go through changing many lines. 99% of all identifiers are
   now written the same on the pascal side as on the C side.
   This makes writing interface code quite a bit less confusing.

   Not everything is completely clean yet, because I did
   not want to change the web2c-specific C files. I often
   took the other approach and removed the underscores
   from the web2c options (like 'parsefirstlinep') in the
   change file instead. Ugly, but predictable.

   There is about a dozen or so of #defines left, that map
        memoryword -> memory_word
         strpool    -> str_pool
   etc.

* The virtual font parsing and interpreting is now done in C.
   (this is because it needs to be interfaced with the lua-based
   font loader)

* I am in the process of merging: the VF stuff; the TFM stuff;
   the lua font loading; and the pdftex font backend into one
   interface, so there were some smallish changes relating to
   that as well. Nothing worth mentioning just yet except that
   luatex now will read "ovf" files as well as "vf" files.

* There are a few really small bugfixes for bug reports I received
  on this list and by email.

==============================================================
Luatex snapshot-20070119 was released 20070119
==============================================================

The largest new bit is the existence of a font.fonts array, that you
can use to query/adjust the internal defined tex fonts. See the manual
for more details.

Two small new lua extensions are added as well:

   * os.setenv() -- to change the environment
   * os.exec()   -- a non-returning os.execute()

And a bit of cleanup in the commandline processing.


==============================================================
Luatex snapshot-20070117 was released 20070117
==============================================================

* the pdftex core is updated to 1.40.1, and web2c to 7.5.6

* the pdftex-specific documentation is removed

* lua lpeg library updated to 0.4
   ( http://www.inf.puc-rio.br/~roberto/lpeg.html )

* the C part of the lua md5 library is added to the binary
   ( http://www.inf.puc-rio.br/~roberto/md5/md5-5/md5.html )

* --luaonly now puts the script itself at arg[0], and
   preceding commandline items in the negative indices
   (instead of starting the count at zero).
   This new approach is compatible with the standalone lua
   interpreter.


==============================================================
Luatex snapshot-20070107 was released 20070107
==============================================================

Hot on the heels of 20070105, a new snapshot. It turns out
that using the callback to define a font broke all ligatures.
This snapshot fixes that, and it has a few minor updates to
the manual. Next shapshot will be after the inclusion of
pdftex 1.40.1.

==============================================================
Luatex snapshot-20070105 was released 20070105
==============================================================

 * the calculations that converted lua strings into tex units
   were horrendously wrong, this was discovered by Pawel.

 * io.lines() was still using the old, line ending sensitive,
   code from the lua core distribution

 * The main font memory is allocated as needed^(1) instead of
   statically pre-allocated.

 * ligatures and kerns are separated completely from each other,
   so use of \noligatures no longer inhibits kerning as well

 * Metrics can be loaded using a callback: 'define_font'.
   The value returned should be a lua table representing a tfm
   file.

 * there is a new lua table: font. It has one function:
   font.read_tfm() that returns a table reprentation of the tfm
   contents, for use with the above mentioned callback

 * I dropped suppport for "Level 1" OFM files. I would like
   to have a try at those extended font files, but I lack
   examples (fonts nor documents). I am not even sure such
   fonts have ever existed in the 'real world'.



==============================================================
Luatex snapshot-20061208 was released 20061208
==============================================================

* There is a new switch: --safer. This disables a number of lua
   functions that are more or less dangerous (a detailed list is
   in the manual)

* Two longstanding bugs have been fixed: \latelua works once
   again (patch by Hartmut) and a bug that caused mysterious crashes
   turned out to be a problem inside the paragraph builder
   (reconstitution of ligatures)

* Six new string iterators have been added to the string library:
      string.characters        (one 1-letter string)
      string.bytes             (one byte)
      string.characterpairs    (two 1-letter strings)
      string.bytepairs         (two bytes)
      string.utfcharacters     (a one-character utf-8 string)
      string.utfvalues         (a unicode code point number)

* The top 256 values of the unicode range (starting at hex
   value "10FF00) are now reserved for byte output. Characters
   in that range will be written by luatex after substracting
   that offset. The net result is that \char"10FFA9 is written
   as byte value hex A9 = decimal 169 = copyright sign in latin1

   This trick allows byte-oriented output to \pdfliterals and
   \specials, but should be considered very experimental.

* There is a new callback called 'process_input_buffer' that can
    be used to mutate the line buffer just before LuaTeX actually
    starts looking at it.

* The statistics table now has readable items
        statistics.inputid
        statistics.lasterrorstring
    that represent TeX's current input id and the last error string

* The show_error_hook callback no longer receives any arguments
* There is a new switch: --safer. This disables a number of lua
   functions that are more or less dangerous (a detailed list is
   in the manual)

* Two longstanding bugs have been fixed: \latelua works once
   again (patch by Hartmut) and a bug that caused mysterious crashes
   turned out to be a problem inside the paragraph builder
   (reconstitution of ligatures)

* Six new string iterators have been added to the string library:
      string.characters        (one 1-letter string)
      string.bytes             (one byte)
      string.characterpairs    (two 1-letter strings)
      string.bytepairs         (two bytes)
      string.utfcharacters     (a one-character utf-8 string)
      string.utfvalues         (a unicode code point number)

* The top 256 values of the unicode range (starting at hex
   value "10FF00) are now reserved for byte output. Characters
   in that range will be written by luatex after substracting
   that offset. The net result is that \char"10FFA9 is written
   as byte value hex A9 = decimal 169 = copyright sign in latin1

   This trick allows byte-oriented output to \pdfliterals and
   \specials, but should be considered very experimental.

* There is a new callback called 'process_input_buffer' that can
    be used to mutate the line buffer just before LuaTeX actually
    starts looking at it.

* The statistics table now has readable items
        statistics.inputid
        statistics.lasterrorstring
    that represent TeX's current input id and the last error string

* The show_error_hook callback no longer receives any arguments

* The statistics table now has readable items
        statistics.luabytecodes
        statistics.luastates
        statistics.luabytecode_bytes
        statistics.luastate_bytes
   for memory statistics reporting


* The statistics table now has readable items
        statistics.luabytecodes
        statistics.luastates
        statistics.luabytecode_bytes
        statistics.luastate_bytes
   for memory statistics reporting


==============================================================
Luatex snapshot-20061204 was released 20061204
==============================================================

* The LuaTeX interpreter can now be run as a standalone lua script
  processor, by using a commandline like this:

    luatex --luaonly=luatools.lua

* Luafilesystem (http://www.keplerproject.org/luafilesystem/ ) is
  included.

* There are a total of eight new file discovery callbacks:
    find_vf_file
    find_ocp_file
    find_map_file
    find_enc_file
    find_sfd_file
    find_pk_file
    find_data_file
    find_opentype_file
  this enhances the orthogonality of the callback system, nothing
  fundamental is changed.

* There is a new callback called 'process_input_buffer' that can
  be used to mutate the line buffer just before LuaTeX actually
  starts looking at it.

* The 'reader' and 'close' functions from 'open_read_file' now
  receive the table they are defined in as a function argument,
  that can be used as a per file localized data store.

* Updated the Lua to the latest 5.1.1, with all known bug patches
  from the website applied as well

* Runtime autoloading of lua .so files is now off on all platforms.

* The statistics table now has readable items
    statistics.filename
    statistics.linenumber
  that represent TeX's current file name and line number

* The support for user-defined type3 font .pgc files and the
  associated 'read_miscfonts_file' callback has been removed.
  (nobody used it anyway)

* General cleanups to the source tree and build process.

==============================================================
Luatex snapshot-20061023 was released 20061023
==============================================================

* there was a missing callback: find_font_file
* program_invocation_name was not set
* buf_size could not be more that 300k


==============================================================
Luatex snapshot-20061013 was released 20061013
==============================================================

Last friday I uploaded a new snapshot and today I finally
finished updating the manual to go with it. The changes all
relate to startup, file i/o, and callbacks. The main achievement
is: you can now run luatex without it *ever* initializing kpathsea.

Because I am lazy, I have checked in the pdf of the manual
as well, so that I can say: Please look at

  https://foundry.supelec.fr/plugins/scmsvn/viewcvs.php/manual/
    /luatexref-t.pdf?root=luatex&rev=148&view=log

for all the details.  :-)

==============================================================
Luatex snapshot-20061002 was released 20061002
==============================================================


* Some infrastructure changes:

  libs/slnunicode-0.9.1/ renamed to libs/slnunicode/
  libs/zziplib added
  libs/luazip added

  (zziplib is using a different version of autofoo. I know I have
  messed up something in the build process, but the bit we need
  compiles ok so I've postponed attempting to fix it)

* The callback logic has changed quite a bit.

  - all callbacks are now only possible in lua state 0.

  - The callback 'input_line' has disappeared, and is replaced by
    'open_read_file'. One of the return values of that callback
    is a table that defines a 'reader' function for line reading.

    See the manual for further information on this.

  - There are some new callbacks for the reading of various binary
    files. The current ones are:

    "read_ocp_file", "read_vf_file", "read_data_file", "read_font_file",
    "read_map_file".

    The rest of the file types will follow soon (fonts, enc files, and
    images).

  - There are also some new callbacks that 'find' a file's pathname:

    "find_truetype_file", "find_type1_file", "find_image_file"

    here too, more will follow later.

  - the functions from io. that were copied to texio have been removed
    again. The new callbacks do not pass file pointers around, so
    they ere not longer needed

  - the 'open_write_file' is temporarily unavailable

* startup.lua is now always loaded into lua state 0

* The luazip library from kepler is linked in, so there the table 'zip'
  is accessible from all lua states.

==============================================================
Luatex snapshot-20060922 was released 20060922
==============================================================

* The texio table has gained a new function:

     tex_file = texio.open(filename)

   returns a file handle of a type that luatex can use
   internally (the return of io.open is unusable in callbacks
   because it will be garbage-collected at a random time)


* In related news, there are two new callbacks you can define:

        callback.register('open_read_file', f)
        callback.register('open_write_file', f)

   where your function should have the following conventions:

   function f (number id_number, string asked_name)
      return boolean success, string actual_name, tex_file filep
   end

   id_number:   zero for the log or \input files  or TeX's \read
                number incremented by one (\read0 becomes 1).
   asked_name:  the user-supplied filename

   success:     return false for error, true otherwise.

   The remaining two items are only looked at if you return true:

   actual_name:  the true filename used (with extension!)
   filep:        a file object opened though texio.open()


* The tex.print function has an extra optional parameter:

       tex.print(ctt_id n, strings ...)

   This prints the strings using the catcode regime defined by
   \catcodetable n (assuming n is valid, see below)

* The new function tex.sprint has the same lua conventions as
   tex.print, but behaces slightly different on the tex side:

   ** tex does not switch to the 'new_line' state (this implies
      that leading spaces are not ignored)
   ** no \endlinechars are inserted
   ** trailing spaces are not removed from the argument

* Catcode tables are a completely new feature, that allows
   you to switch the current catcode regime in one simple
   statement:

   \catcodetable <count>

      Switches to the use of a different set of catcodes (table),
      that is stored under the number <count>. Such a table has to
      be previously created using one of the two command below, or
      the number 0 (which is pre-inititialized)

      This command obeys normal grouping rules.

   \initcatcodetable <count>

      creates a new, global, independent catcode table with catcodes
      matching the code that are predefined by initex (tex -ini).

     This allocation is global

   \savecatcodetable <count>

      copies the current set of catcodes to a new, global, table
      with id number <count>. The definitions in this new table
      are all treated as if they were made in the outermost level.

     This allocation is global

   At the end of each grouping level, items within all existing
   catcodetables are restored, regardless of which one is the
   currently active table.

   Catcode table numbers cannot be larger than 0xFFFFFFF (228-1)

* There is a new lua table: lua. It contains three read-only
   items:

     lua.id          -- the id number of the instance
     lua.version     -- a luatex version identifier string
     lua.startupfile -- the full filename (+path) of startup.lua

   and it also contains a read/write array:

     lua.bytecode[]  -- lua executable bytecode

   This array can be used to save and restore lua functions
   across lua states. The accepted values are for assignments
   are functions and nil. Likewise, the retrieved value is
   either a function or nil.

   The contents of the lua.bytecode array is stored inside the
   format file, so it can also be used to preload lua code.


* The format files are quire a bit smaller than before


==============================================================
Luatex snapshot-20060915 was released 20060915
==============================================================

* There is a new TEX primitive: \formatname. It is similar
  to \jobname (read-only). In initex, the expansion is empty,
  otherwise the expansion is the same as the \jobname from
  the initex run.

* the lua "tex" table has been expanded with a few of the 'convert'
  codes (read-only). The supported ones at this moment are:

  tex.eTeXVersion
  tex.OmegaVersion
  tex.AlephVersion
  tex.pdftexrevision
  tex.pdftexbanner
  tex.pdfnormaldeviate
  tex.jobname
  tex.formatname
  tex.eTeXrevision
  tex.Omegarevision
  tex.Alephrevision

  This list looks haphazard,  but it really is not. These are
  all the cases of the 'convert' internal command that do not
  require an argument.

* The metatables of the subtables like tex.dimen[] etc. are now
  adjustable from lua (not that I recommend doing that;-)).

* On the lua side, there is a new global value: "luaid"
  It holds the internal id number of this \directlua instance.

* There is a new lua table, "callback", that has the single function
  "callback.register", used to register callbacks.   This replaces
  the previous concoction (see my message about snapshot 20060901).
  Syntax is :

  callback.register(<callback name>,function (f) ... end)

  where the <callback name> is for the moment, either "input_line"
  or "show_error_hook".

  This function internalizes the callback function in such a way
  that you no longer have to worry about \luacallback (which has
  been removed), nor does it matter if you redefine a function
  accidentally.

 The internal testing for callback presence is also quite a bit
 faster, thanks to this change. Callback assignments are global
 and the "input_line" always takes effect starting on the next
 input line to be read from an actual file.


* \detokenizedlua has been removed. It is functionally replaced by
  the new function call tex.write("").

  Each argument to each call of tex.write () counts as an input
  line, but:
  ** all catcodes on that line are either 'space' (for " ") or
     'character' for all others.
  ** there is no \newlinechar appended.

* The implementation of tex.print() has changed as well:

  ** the very last tex.print() line from a \directlua
     will no longer have a trailing \newlinechar
     (this is very convenient when \directlua is used
     within an \edef)
  ** tex.print() is quite a lot faster than before, and the total amount
     of returnable text from a \directlua is now only limited by
     available system RAM. However, each separate tex.print ()
     argument has to fit in TeX's input buffer.

* The new primitive \luastartup can be set inside the format file
  to specify the lua instance number in which a possible runtime
  startup.lua script is executed (initex always uses 0)

* There is a new primitive \scantextokens. Differences with
  eTeX's \scantokens are:

  ** the last line (usually only) from \scantextokens
     does not have a \newlinechar

  ** \scantextokens never raises an eof error.

  This means things like

  \edef\testone
        {\scantextokens{\ifnum1=1 true}\else false\fi}

  are legal input (but potentially dangerous!).

* If you say
     local d  = tex.dimen["unknowndimen"]
  'd' will now become "nil" instead of raising an error

   However,
     tex.dimen["unknowndimen"] = d
   is still (and probably will remain) illegal

==============================================================
Luatex snapshot-20060908 was released 20060908
==============================================================

* BIG CHANGE: \directlua now runs \scantokens internally.

  There is no longer a need to call scantokens yourself, the
  tex.print() output is now fed straight into a pseudo file.
  This is quite a bit faster as well as easier to use, but
  just in case you want it, the old behaviour is still present,
  under the new name

    \detokenizedlua


* The texio library now has its own (partial) set of I/O commands,
  so that the standard lua io library is back to the distributed
  state (no more patched garbage collector)

  Note: This is really a very small change (it should not have any
  impact on wellbehaved input files), but I attempt to be complete
  in these notes, since there is no official documentation yet.


* There is a new standard library available: kpse

  The most important function in that library is find_file:

    string = kpse.find_file(string filename
                            [,string type]
                            [,boolean mustexist])

  both "type" and "mustexist" are optional, so the function
  has from one upto three arguments.

  "type" is like the '-format' argument of kpsewhich. You can
     run 'kpsewich -h'  for a list. The default type is "tex".

  "mustexist" is like '-must-exist', and the default  is false.
     If you specify "true" (or a nonzero integer), then the kpse
     library will search the disk as well as the ls-R databases

  The new library also has three other functions that map
  straight to kpsewhich commandline options:

    string = kpse.expand_path(string)
    string = kpse.expand_var(string)
    string = kpse.expand_braces(string)

* There is a second callback possibility:

    texio.show_error_hook(string message,
                          string|number indicator,
                          number lineno)

  This command is run from inside the TeX error function, and the
  idea is to allow you to do some extra reporting on top of what
  TeX already does (none of the normal actions are removed).

  "message" is the formal error message tex has given to the
     user (the line after the "! ")
  "indicator" is either a filename (when it is a string) or a
     location indicator (a number) that can means lots of different
     things like a token list id or a \read number.
  "lineno"  is the current line number

  This is an investigative item only, comments are welcome but do
  not take the syntax seriously.

  The final goal IMO is the total replacement of TeX's error
  handling routines, but that needs lots of adjustments
  in the web source because TeX deals with errors in a somewhat
  haphazard fashion (it needs unification first). The current
  hook is only for 'testing the water'.

* It is now possible to use named items in the

    tex.count[]
    tex.dimen[]
    tex.toks[]

  subtables, so you can have

    tex.count.scratchcounter = 0
        local enormous = tex.dimen["maxdimen"]

  Luatex looks up the value for you on the fly. You have to use a
  valid \countdef (or \dimendef, or \toksdef), anything else will
  generate an error.

  In a normal TeX file, you don't do \dimen\maxdimen, but the
  lua syntax seems to be a bit cleaner to me. The intention is
  to evntually also allow \chardefs and macros that expand
  into a number (todo)


* The tex table has also been extended with a large list of internal
  parameters (partially read/write). It is possible to access
  about every primitive that you can use after \the *and* is a
  single token. So there is

       integer   = tex.tracingcommands (\the\tracingcommands)
       integer   = tex.prevgraf        (\the\prevgraf)
       string    = tex.output          (\the\output)

  etc. for all of the internal parameters, but not the items
  that need extra arguments (like \the\scriptfont )

  The subset comprising simple integer and dimension registers
  are writable as well as readable (stuff like \tracingcommands
  and \parindent).

  The fact that both lists are still quite limited is a result of
  the very different types of things that can occur after \the and
  also on the LHS of an assignment. The remaining primitives will
  be filled in when there is a real need or implementation becomes
  simple, whichever comes first.



==============================================================
Luatex snapshot-20060901 was released 20060901
==============================================================

All changes are related to lua this time, and most are quite unstable
/ experimental. But first the things that are stabel/fixed bugs:

* A VF loading bug that turned up in some of Hans' fonts
  has been fixed

* A small series of bounds checking fixes to \ocplist has been
  added to prevent the system from crashing due to array indexes
  running out of bounds.

* The Lua file searching paths are now fixed. The search path for lua
  script files now contains the following items (tried in order)
  1. the local directory:
       ./?.lua
    (for document-specific files)
  2. the items from the expansion of kpathsea's $TEXMFSCRIPTS variable,
    but only the parts containing 'lua' as a subpath:
       $TEXMFSCRIPTS<lua>/?.lua
       $TEXMFSCRIPTS<lua>/?/init.lua
     (for format-specific files)
  3. the $SELFAUTOPARENT sibling directory named 'lib'.
       $SELFAUTOPARENT/lib/lua/5.1/?.lua
       $SELFAUTOPARENT/lib/lua/5.1/?/init.lua
     (for files that are not related to tex)

  The search path for dynamic libraries has only
  1. the local directory:
       ./?.so
    (for document-specific files)
  2. and the $SELFAUTOPARENT sibling directory named 'lib'.
       $SELFAUTOPARENT/lib/lua/5.1/?.so

  (of course the extension is .dll on windows, but .dlls do not
   work at the moment so it will not do you much good)

* There are two functions available within a new table called
  texio:
    texio.write (luastring)
    texio.write_nl (luastring)
  both write the luastring to the same location(s) TeX writes
  its stuff. So if \batchmode is on, it writes only to the
  log, inside a \write, it prints to the current write file,
  etc.

  A read|write interface to TeX's "file selector" will
  follow shortly.

* At startup, luatex searches for a script named
    startup.lua
  in the path list I explained above. If such a file exists, it is
  loaded.

  This happens right before the first input file needs to be opened
  (that is after format loading, but before any \everyjob tokens).

  From within the script, you can check the value of

    tex.formatname

  that is the 'format identification' as used by TEX. When the variable
  is equal to nil, luatex in in 'initex' mode, otherwise it will be
  something like: " (format=plain 2006.9.1)"


Now for the experimental portion: callbacks. Here is what I have done
so far:

* The main reason for wanting startup.lua is file (input) re-encoding.
  For this purpose, it is now possible to set up a callback for
  luatex to execute.

  If you attach a Lua function to

    texio.input_line

  then from the next input line onwards, luatex will run that
  function whenever it needs a new input line from a text file.

  Your function will receive a file handle as argument, and
  should return either a string or nil (with nil signalling that
  the end of file has occurred).

  The trivial case is simply this:

    function reader (f)
        return f:read()
    end
    texio.input_line = reader


  Warning: The implementation is not totally finished yet. For the
  moment the file handle ("f" in the example) is a normal lua file,
  with a simple but important restriction: you cannot alter its value.
  You cannot f:close() it, or assign it a different value. luatex
  will eventually close the file itself.

  The restriction is a side-effect of a synchronisation problem with
  the lua garbage collector. Because of this, it also was necessary
  to turn off the automatic file closing code for normal lua io
  files (In other words: you have to close yourself all the files
  you opened yourself, and you should not close any files you did
  not open yourself).

  In the near future, "f" will become a special 'texio' file object
  and the needed functionality from the normal io library will be
  reimplemented. Along with that change, there will also be a callback
  to open (i.e. find) files, and a simple interface to the compiled-in
  kpathsea to use within that callback.


==============================================================
Luatex snapshot-20060825 was released 20060825
==============================================================

The main change in this snapshot is that it uses far less memory.
luatex -ini on my linux machine went from 326Mb (last week) to
93Mb (now), and "texexec luatex" now ends at 184Mb instead of
over 1/2Gb.

This is achieved by two big changes:

* The \mathcode, \delcode, \catcode, \sfcode, \lccode and \uccode
   tables are now sparse arrays that are implemented in C. They
   are no longer part of the TeX "equivalence table" and because
   each had 1.1 million entries with a few memory words each, this
   makes a major difference.

   See mathcodes.c and textcodes.c if you are interested in the
   gory details, but be warned: the code is still extremely
   rough and ugly. In particular, the dump and undump routines
   are far from optimal, resulting in somewhat larger format files
   than before (approx 1.3Mb larger with unicode-letters loaded,
   10k without); and the assignments do not show up when using
   the etex tracing routines \tracingassigns and \tracingrestores
   (code simply not written yet)

* Single-character commands are no longer "special" internally,
   they are stored in the hash just like the multiletter csnames.


==============================================================
Luatex snapshot-20060818 was released 20060818
==============================================================

The snapshot is up to par with Aleph-RC4 (from texlive devel)
and the latest pdftex beta (even newer than 20060811). However,
there are some differences, to summarize:

* There is no pool file (all strings are embedded)

* -8bit and -translate-file are silently ignored

* There is no mltex nor enctex (conflicts with aleph)

* The tex functionality is always present and enabled
  (but see below about TeXXeT), so the asterisk or
  -etex switch for initex is not needed

* "plus 1 filllllllll" does not generate any errors from TeX

* TeXXeT (from eTeX) is not present, so the primives
    \TeXXeTstate
    \beginR
    \beginL
    \endR
    \endL
  are missing

* The experimental pdftex regex match operations are removed,
  because that feature does not make much sense when lua is
  available so the primitives
        \pdfmatch
    \pdflastmatch
  are missing

* The input translations from Aleph are not implemented, the
  16 related primitives are all missing
     \DefaultInputMode
     \noDefaultInputMode
     \noInputMode
     \InputMode
     \DefaultOutputMode
     \noDefaultOutputMode
     \noOutputMode
     \OutputMode
     \DefaultInputTranslation
     \noDefaultInputTranslation
     \noInputTranslation
     \InputTranslation
     \DefaultOutputTranslation
     \noDefaultOutputTranslation
     \noOutputTranslation
     \OutputTranslation
  All file IO assumes UTF-8, except that all the low-ascii
  controls except TAB, CR en LF are written to the terminal
  using ^^  notation (even these are binary in the log file).

* Input characters can use the full range of Unicode,
  but it probably only makes sense to use values above
  the base plane for \mathcode and \catcode assignments,
  since the fonts as well as the hyphenation patterns
  are strictly 16-bit still.

* The primitives
     \pdfpagewidth and \pagewidth,
     \pdfpageheight and \pageheight,
     \fontcharwd and \charwd,
     \fontcharht and \charht,
     \fontchardp and \chardp,
     \fontcharic and \charic,
  are all aliases of eachother.

* The new primitive
     \clearmarks<number>
  clears a marks class completely.

* The experimental pdftex primitives
     \pdfprimitive
     \ifpdfprimitive
     \ifpdfabsnum
     \ifpdfabsdim
  and provided without the extra 'pdf' prefix, so they are
  simply called
     \primitive
     \ifprimitive
     \ifabsnum
     \ifabsdim
  instead.

* I probably forgot to mention some things :-)