(Managing Overlays): overlay-buffer returns nil for deleted overlays.

[emacs.git] / lispref / vol2.texi

This file is obsolete, and no longer part of the Emacs Lisp Reference Manual.
It is still present in CVS in case we ever want to use some of it again.

@c This is part of the GNU Emacs Lisp Reference Manual.
@c Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1998, 1999
@c   Free Software Foundation, Inc.
@c See the file elisp.texi for copying conditions.


\input texinfo  @c -*-texinfo-*-
@c %**start of header
@setfilename elisp
@settitle GNU Emacs Lisp Reference Manual: Volume 2
@smallbook
@c %**end of header


@tex
%%%% Experiment with smaller skip before sections and subsections.
%%%% --rjc 30mar92

\global\secheadingskip = 17pt plus 6pt minus 3pt
\global\subsecheadingskip = 14pt plus 6pt minus 3pt

% The defaults are:
%   \secheadingskip = 21pt plus 8pt minus 4pt
%   \subsecheadingskip = 17pt plus 8pt minus 4pt
@end tex

@finalout
@c tex
@c \overfullrule=0pt
@c end tex

@c Start volume 2 chapter numbering on chapter 21;
@c this must be listed as chapno 20.
@tex
\global\chapno=20
@end tex

@c ================================================================
@c Note: I was unable to figure out how to get .aux files copied
@c properly in the time I had.  Hence need to copy .aux file before
@c running Tex.  --rjc

@tex

\message{}
\message{Redefining contents commands...}
\message{}

% Special @contents  command

% This inputs fixed up table of contents file rather than create new one.
\global\def\contents{%
   \startcontents{Table of Contents}%
      \input elisp2-toc-ready.toc
   \endgroup
   \vfill \eject
}

% Special @summarycontents  command
% This inputs fixed up table of contents file rather than create new one.
\global\def\summarycontents{%
   \startcontents{Short Contents}%
      %
      \let\chapentry = \shortchapentry
      \let\unnumbchapentry = \shortunnumberedentry
      % We want a true roman here for the page numbers.
      \secfonts
      \let\rm=\shortcontrm \let\bf=\shortcontbf \let\sl=\shortcontsl
      \rm
      \advance\baselineskip by 1pt % Open it up a little.
      \def\secentry ##1##2##3##4{}
      \def\unnumbsecentry ##1##2{}
      \def\subsecentry ##1##2##3##4##5{}
      \def\unnumbsubsecentry ##1##2{}
      \def\subsubsecentry ##1##2##3##4##5##6{}
      \def\unnumbsubsubsecentry ##1##2{}
      \input elisp2-toc-ready.toc
   \endgroup
   \vfill \eject
}

\message{}
\message{Formatting special two volume edition...Volume 2...}
\message{}
@end tex
@c ================================================================


@c ==> This `elisp-small.texi' is a `smallbook' version of the manual.

@c ==== Following are acceptable over and underfull hboxes in TeX ====

@c -----
@c [163] [164] [165] [166]) (loading.texi Chapter 13 [167] [168] [169]
@c Overfull \hbox (20.5428pt too wide) in paragraph at lines 131--131
@c []@ninett
@c setenv EMAC-SLOAD-PATH .:/user/bil/emacs:/usr/local/lib/emacs/lisp[]
@c -----
@c (minibuf.texi Chapter 17 [206] [207] [208] [209] [210] [211] [212] [213]
@c [214] [215]
@c Overfull \hbox (2.09094pt too wide) in paragraph at lines 550--560
@c @texttt map[] @textrm if @textsl require-match @textrm is
@c  @texttt nil[]@textrm , or else with the keymap @texttt minibuffer-
@c -----
@c (locals.texi Appendix @char 68 [533] [534]
@c Underfull \hbox (badness 2512) in paragraph at lines 4--4
@c []@chaprm Appendix DStandard Buffer-Local

@c -------------------------------------------------------------------

@c
@c Combine indices.
@synindex cp fn
@syncodeindex vr fn
@syncodeindex ky fn
@syncodeindex pg fn
@syncodeindex tp fn
@c oops: texinfo-format-buffer ignores synindex
@c

@ifinfo
This file documents GNU Emacs Lisp.

@c The edition number appears in several places in this file
@c and also in the file intro.texi.
This is edition 2.4 of the GNU Emacs Lisp Reference
Manual.  It corresponds to Emacs Version 19.29.
@c Please REMEMBER to update edition number in *four* places in this file
@c                 and also in *one* place in ==> intro.texi <==
@c huh?  i only found three real places where the edition is stated, and
@c one place where it is not stated explicitly ("this info file is newer
@c than the foobar edition").  --mew 13sep93

Published by the Free Software Foundation
59 Temple Place, Suite 330
Boston, MA  02111-1307 USA
@end ifinfo

@setchapternewpage odd

@iftex
@shorttitlepage The GNU Emacs Lisp Reference Manual: Volume 2
@end iftex
@titlepage
@sp 1
@center @titlefont{The}
@sp 1
@center @titlefont{GNU Emacs Lisp}
@sp 1
@center @titlefont{Reference Manual}
@sp 2
@center GNU Emacs Version 19.29
@center for Unix Users
@sp 1
@center Edition 2.4, June 1995
@sp 2
@center @titlefont{Volume 2}
@sp 3
@center by Bil Lewis, Dan LaLiberte,
@center and the GNU Manual Group
@page
@vskip 0pt plus 1filll
Copyright @copyright{} 1990, 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.

@sp 2
Edition 2.4 @*
Revised for Emacs Version 19.29,@*
June, 1995.@*
@sp 2
ISBN 1-882114-71-X

@sp 2
Published by the Free Software Foundation @*
59 Temple Place, Suite 330 @*
Boston, MA  02111-1307 USA

@sp 1
Permission is granted to make and distribute verbatim copies of this
manual provided the copyright notice and this permission notice are
preserved on all copies.

Permission is granted to copy and distribute modified versions of this
manual under the conditions for verbatim copying, provided also that the
section entitled ``GNU General Public License'' is included
exactly as in the original, and provided that the entire resulting
derived work is distributed under the terms of a permission notice
identical to this one.

Permission is granted to copy and distribute translations of this manual
into another language, under the above conditions for modified versions,
except that the section entitled ``GNU General Public License'' may be
included in a translation approved by the Free Software Foundation
instead of in the original English.

@sp 2
Cover art by Etienne Suvasa.
@end titlepage
@page

@node Top, Copying, (dir), (dir)

@ifinfo
This Info file contains edition 2.4 of the GNU Emacs Lisp Reference
Manual, corresponding to GNU Emacs version 19.29.
@end ifinfo

@menu
* Copying::                 Conditions for copying and changing GNU Emacs.
* Introduction::            Introduction and conventions used.

* Lisp Data Types::         Data types of objects in Emacs Lisp.
* Numbers::                 Numbers and arithmetic functions.
* Strings and Characters::  Strings, and functions that work on them.
* Lists::                   Lists, cons cells, and related functions.
* Sequences Arrays Vectors::  Lists, strings and vectors are called sequences.
                                Certain functions act on any kind of sequence.
                                The description of vectors is here as well.
* Symbols::                 Symbols represent names, uniquely.

* Evaluation::              How Lisp expressions are evaluated.
* Control Structures::      Conditionals, loops, nonlocal exits.
* Variables::               Using symbols in programs to stand for values.
* Functions::               A function is a Lisp program
                              that can be invoked from other functions.
* Macros::                  Macros are a way to extend the Lisp language.

* Loading::                 Reading files of Lisp code into Lisp.
* Byte Compilation::        Compilation makes programs run faster.
* Debugging::               Tools and tips for debugging Lisp programs.

* Read and Print::          Converting Lisp objects to text and back.
* Minibuffers::             Using the minibuffer to read input.
* Command Loop::            How the editor command loop works,
                              and how you can call its subroutines.
* Keymaps::                 Defining the bindings from keys to commands.
* Modes::                   Defining major and minor modes.
* Documentation::           Writing and using documentation strings.

* Files::                   Accessing files.
* Backups and Auto-Saving:: Controlling how backups and auto-save
                              files are made.
* Buffers::                 Creating and using buffer objects.
* Windows::                 Manipulating windows and displaying buffers.
* Frames::                  Making multiple X windows.
* Positions::               Buffer positions and motion functions.
* Markers::                 Markers represent positions and update
                              automatically when the text is changed.

* Text::                    Examining and changing text in buffers.
* Searching and Matching::  Searching buffers for strings or regexps.
* Syntax Tables::           The syntax table controls word and list parsing.
* Abbrevs::                 How Abbrev mode works, and its data structures.

* Processes::               Running and communicating with subprocesses.
* System Interface::        Getting the user id, system type, environment
                              variables, and other such things.
* Display::                 Parameters controlling screen usage.
                              The bell.  Waiting for input.
* Calendar::                Customizing the calendar and diary.

Appendices

* Tips::                    Advice for writing Lisp programs.
* GNU Emacs Internals::     Building and dumping Emacs;
                              internal data structures.
* Standard Errors::         List of all error symbols.
* Standard Buffer-Local Variables::  List of variables local in all buffers.
* Standard Keymaps::        List of standard keymaps.
* Standard Hooks::          List of standard hook variables.

* Index::                   Index including concepts, functions, variables,
                              and other terms.

      --- The Detailed Node Listing ---

Here are other nodes that are inferiors of those already listed,
mentioned here so you can get to them in one step:

Introduction

* Caveats::                 Flaws and a request for help.
* Lisp History::            Emacs Lisp is descended from Maclisp.
* Conventions::             How the manual is formatted.
* Acknowledgements::        The authors, editors, and sponsors of this manual.

Conventions

* Some Terms::              Explanation of terms we use in this manual.
* nil and t::               How the symbols @code{nil} and @code{t} are used.
* Evaluation Notation::     The format we use for examples of evaluation.
* Printing Notation::       The format we use for examples that print output.
* Error Messages::          The format we use for examples of errors.
* Buffer Text Notation::    The format we use for buffer contents in examples.
* Format of Descriptions::  Notation for describing functions, variables, etc.

Format of Descriptions

* A Sample Function Description::
* A Sample Variable Description::

Lisp Data Types

* Printed Representation::  How Lisp objects are represented as text.
* Comments::                Comments and their formatting conventions.
* Programming Types::       Types found in all Lisp systems.
* Editing Types::           Types specific to Emacs.
* Type Predicates::         Tests related to types.
* Equality Predicates::     Tests of equality between any two objects.

Programming Types

* Integer Type::        Numbers without fractional parts.
* Floating Point Type:: Numbers with fractional parts and with a large range.
* Character Type::      The representation of letters, numbers and
                        control characters.
* Sequence Type::       Both lists and arrays are classified as sequences.
* Cons Cell Type::      Cons cells, and lists (which are made from cons cells).
* Array Type::          Arrays include strings and vectors.
* String Type::         An (efficient) array of characters.
* Vector Type::         One-dimensional arrays.
* Symbol Type::         A multi-use object that refers to a function,
                        variable, property list, or itself.
* Function Type::       A piece of executable code you can call from elsewhere.
* Macro Type::          A method of expanding an expression into another
                          expression, more fundamental but less pretty.
* Primitive Function Type::     A function written in C, callable from Lisp.
* Byte-Code Type::      A function written in Lisp, then compiled.
* Autoload Type::       A type used for automatically loading seldom-used
                        functions.

List Type

* Dotted Pair Notation::    An alternative syntax for lists.
* Association List Type::   A specially constructed list.

Editing Types

* Buffer Type::             The basic object of editing.
* Window Type::             What makes buffers visible.
* Window Configuration Type::Save what the screen looks like.
* Marker Type::             A position in a buffer.
* Process Type::            A process running on the underlying OS.
* Stream Type::             Receive or send characters.
* Keymap Type::             What function a keystroke invokes.
* Syntax Table Type::       What a character means.

Numbers

* Integer Basics::            Representation and range of integers.
* Float Basics::              Representation and range of floating point.
* Predicates on Numbers::     Testing for numbers.
* Comparison of Numbers::     Equality and inequality predicates.
* Arithmetic Operations::     How to add, subtract, multiply and divide.
* Bitwise Operations::        Logical and, or, not, shifting.
* Numeric Conversions::       Converting float to integer and vice versa.
* Math Functions::            Trig, exponential and logarithmic functions.
* Random Numbers::            Obtaining random integers, predictable or not.

Strings and Characters

* String Basics::           Basic properties of strings and characters.
* Predicates for Strings::  Testing whether an object is a string or char.
* Creating Strings::        Functions to allocate new strings.
* Text Comparison::         Comparing characters or strings.
* String Conversion::       Converting characters or strings and vice versa.
* Formatting Strings::      @code{format}: Emacs's analog of @code{printf}.
* Character Case::          Case conversion functions.

Lists

* Cons Cells::              How lists are made out of cons cells.
* Lists as Boxes::          Graphical notation to explain lists.
* List-related Predicates:: Is this object a list?  Comparing two lists.
* List Elements::           Extracting the pieces of a list.
* Building Lists::          Creating list structure.
* Modifying Lists::         Storing new pieces into an existing list.
* Sets And Lists::          A list can represent a finite mathematical set.
* Association Lists::       A list can represent a finite relation or mapping.

Modifying Existing List Structure

* Setcar::                  Replacing an element in a list.
* Setcdr::                  Replacing part of the list backbone.
                              This can be used to remove or add elements.
* Rearrangement::           Reordering the elements in a list; combining lists.

Sequences, Arrays, and Vectors

* Sequence Functions::      Functions that accept any kind of sequence.
* Arrays::                  Characteristics of arrays in Emacs Lisp.
* Array Functions::         Functions specifically for arrays.
* Vectors::                 Functions specifically for vectors.

Symbols

* Symbol Components::       Symbols have names, values, function definitions
                              and property lists.
* Definitions::             A definition says how a symbol will be used.
* Creating Symbols::        How symbols are kept unique.
* Property Lists::          Each symbol has a property list
                              for recording miscellaneous information.

Evaluation

* Intro Eval::              Evaluation in the scheme of things.
* Eval::                    How to invoke the Lisp interpreter explicitly.
* Forms::                   How various sorts of objects are evaluated.
* Quoting::                 Avoiding evaluation (to put constants in
                              the program).

Kinds of Forms

* Self-Evaluating Forms::   Forms that evaluate to themselves.
* Symbol Forms::            Symbols evaluate as variables.
* Classifying Lists::       How to distinguish various sorts of list forms.
* Function Forms::          Forms that call functions.
* Macro Forms::             Forms that call macros.
* Special Forms::           ``Special forms'' are idiosyncratic primitives,
                              most of them extremely important.
* Autoloading::             Functions set up to load files
                              containing their real definitions.

Control Structures

* Sequencing::              Evaluation in textual order.
* Conditionals::            @code{if}, @code{cond}.
* Combining Conditions::    @code{and}, @code{or}, @code{not}.
* Iteration::               @code{while} loops.
* Nonlocal Exits::          Jumping out of a sequence.

Nonlocal Exits

* Catch and Throw::         Nonlocal exits for the program's own purposes.
* Examples of Catch::       Showing how such nonlocal exits can be written.
* Errors::                  How errors are signaled and handled.
* Cleanups::                Arranging to run a cleanup form if an
                              error happens.

Errors

* Signaling Errors::        How to report an error.
* Processing of Errors::    What Emacs does when you report an error.
* Handling Errors::         How you can trap errors and continue execution.
* Error Symbols::           How errors are classified for trapping them.

Variables

* Global Variables::        Variable values that exist permanently, everywhere.
* Constant Variables::      Certain "variables" have values that never change.
* Local Variables::         Variable values that exist only temporarily.
* Void Variables::          Symbols that lack values.
* Defining Variables::      A definition says a symbol is used as a variable.
* Accessing Variables::     Examining values of variables whose names
                              are known only at run time.
* Setting Variables::       Storing new values in variables.
* Variable Scoping::        How Lisp chooses among local and global values.
* Buffer-Local Variables::  Variable values in effect only in one buffer.

Scoping Rules for Variable Bindings

* Scope::                   Scope means where in the program a value
                              is visible.  Comparison with other languages.
* Extent::                  Extent means how long in time a value exists.
* Impl of Scope::           Two ways to implement dynamic scoping.
* Using Scoping::           How to use dynamic scoping carefully and
                              avoid problems.

Buffer-Local Variables

* Intro to Buffer-Local::   Introduction and concepts.
* Creating Buffer-Local::   Creating and destroying buffer-local bindings.
* Default Value::           The default value is seen in buffers
                              that don't have their own local values.

Functions

* What Is a Function::      Lisp functions vs primitives; terminology.
* Lambda Expressions::      How functions are expressed as Lisp objects.
* Function Names::          A symbol can serve as the name of a function.
* Defining Functions::      Lisp expressions for defining functions.
* Calling Functions::       How to use an existing function.
* Mapping Functions::       Applying a function to each element of a list, etc.
* Anonymous Functions::     Lambda-expressions are functions with no names.
* Function Cells::          Accessing or setting the function definition
                              of a symbol.
* Related Topics::          Cross-references to specific Lisp primitives
                              that have a special bearing on how
                              functions work.

Lambda Expressions

* Lambda Components::       The parts of a lambda expression.
* Simple Lambda::           A simple example.
* Argument List::           Details and special features of argument lists.
* Function Documentation::  How to put documentation in a function.

Macros

* Simple Macro::            A basic example.
* Expansion::               How, when and why macros are expanded.
* Compiling Macros::        How macros are expanded by the compiler.
* Defining Macros::         How to write a macro definition.
* Backquote::               Easier construction of list structure.
* Problems with Macros::    Don't evaluate the macro arguments too many times.
                              Don't hide the user's variables.

Loading

* How Programs Do Loading:: The @code{load} function and others.
* Autoload::                Setting up a function to autoload.
* Named Features::          Loading a library if it isn't already loaded.
* Repeated Loading::        Precautions about loading a file twice.

Byte Compilation

* Compilation Functions::   Byte compilation functions.
* Disassembly::             Disassembling byte-code; how to read byte-code.

Debugging Lisp Programs

* Debugger::                How the Emacs Lisp debugger is implemented.
* Syntax Errors::           How to find syntax errors.
* Compilation Errors::      How to find errors that show up in
                              byte compilation.
* Edebug::                  A source-level Emacs Lisp debugger.

The Lisp Debugger

* Error Debugging::         Entering the debugger when an error happens.
* Function Debugging::      Entering it when a certain function is called.
* Explicit Debug::          Entering it at a certain point in the program.
* Using Debugger::          What the debugger does; what you see while in it.
* Debugger Commands::       Commands used while in the debugger.
* Invoking the Debugger::   How to call the function @code{debug}.
* Internals of Debugger::   Subroutines of the debugger, and global variables.

Debugging Invalid Lisp Syntax

* Excess Open::             How to find a spurious open paren or missing close.
* Excess Close::            How to find a spurious close paren or missing open.

Reading and Printing Lisp Objects

* Streams Intro::           Overview of streams, reading and printing.
* Input Streams::           Various data types that can be used as
                              input streams.
* Input Functions::         Functions to read Lisp objects from text.
* Output Streams::          Various data types that can be used as
                              output streams.
* Output Functions::        Functions to print Lisp objects as text.

Minibuffers

* Intro to Minibuffers::    Basic information about minibuffers.
* Text from Minibuffer::    How to read a straight text string.
* Object from Minibuffer::  How to read a Lisp object or expression.
* Completion::              How to invoke and customize completion.
* Yes-or-No Queries::       Asking a question with a simple answer.
* Minibuffer Misc::         Various customization hooks and variables.

Completion

* Basic Completion::        Low-level functions for completing strings.
                              (These are too low level to use the minibuffer.)
* Minibuffer Completion::   Invoking the minibuffer with completion.
* Completion Commands::     Minibuffer commands that do completion.
* High-Level Completion::   Convenient special cases of completion
                              (reading buffer name, file name, etc.)
* Reading File Names::      Using completion to read file names.
* Programmed Completion::   Finding the completions for a given file name.

Command Loop

* Command Overview::    How the command loop reads commands.
* Defining Commands::   Specifying how a function should read arguments.
* Interactive Call::    Calling a command, so that it will read arguments.
* Command Loop Info::   Variables set by the command loop for you to examine.
* Input Events::        What input looks like when you read it.
* Reading Input::       How to read input events from the keyboard or mouse.
* Waiting::             Waiting for user input or elapsed time.
* Quitting::            How @kbd{C-g} works.  How to catch or defer quitting.
* Prefix Command Arguments::    How the commands to set prefix args work.
* Recursive Editing::   Entering a recursive edit,
                          and why you usually shouldn't.
* Disabling Commands::  How the command loop handles disabled commands.
* Command History::     How the command history is set up, and how accessed.
* Keyboard Macros::     How keyboard macros are implemented.

Defining Commands

* Using Interactive::       General rules for @code{interactive}.
* Interactive Codes::       The standard letter-codes for reading arguments
                              in various ways.
* Interactive Examples::    Examples of how to read interactive arguments.

Keymaps

* Keymap Terminology::          Definitions of terms pertaining to keymaps.
* Format of Keymaps::           What a keymap looks like as a Lisp object.
* Creating Keymaps::            Functions to create and copy keymaps.
* Inheritance and Keymaps::     How one keymap can inherit the bindings
                                  of another keymap.
* Prefix Keys::                 Defining a key with a keymap as its definition.
* Menu Keymaps::                A keymap can define a menu for X
                                  or for use from the terminal.
* Active Keymaps::              Each buffer has a local keymap
                                  to override the standard (global) bindings.
                                Each minor mode can also override them.
* Key Lookup::                  How extracting elements from keymaps works.
* Functions for Key Lookup::    How to request key lookup.
* Changing Key Bindings::       Redefining a key in a keymap.
* Key Binding Commands::        Interactive interfaces for redefining keys.
* Scanning Keymaps::            Looking through all keymaps, for printing help.

Major and Minor Modes

* Major Modes::             Defining major modes.
* Minor Modes::             Defining minor modes.
* Mode Line Format::        Customizing the text that appears in the mode line.
* Hooks::                   How to use hooks; how to write code that
                              provides hooks.

Major Modes

* Major Mode Conventions::  Coding conventions for keymaps, etc.
* Example Major Modes::     Text mode and Lisp modes.
* Auto Major Mode::         How Emacs chooses the major mode automatically.
* Mode Help::               Finding out how to use a mode.

Minor Modes

* Minor Mode Conventions::  Tips for writing a minor mode.
* Keymaps and Minor Modes:: How a minor mode can have its own keymap.

Mode Line Format

* Mode Line Data::          The data structure that controls the mode line.
* Mode Line Variables::     Variables used in that data structure.
* %-Constructs::            Putting information into a mode line.

Documentation

* Documentation Basics::    Good style for doc strings.
                              Where to put them.  How Emacs stores them.
* Accessing Documentation:: How Lisp programs can access doc strings.
* Keys in Documentation::   Substituting current key bindings.
* Describing Characters::   Making printable descriptions of
                              non-printing characters and key sequences.
* Help Functions::          Subroutines used by Emacs help facilities.

Files

* Visiting Files::          Reading files into Emacs buffers for editing.
* Saving Buffers::          Writing changed buffers back into files.
* Reading from Files::      Reading files into other buffers.
* Writing to Files::        Writing new files from parts of buffers.
* File Locks::              Locking and unlocking files, to prevent
                                simultaneous editing by two people.
* Information about Files::   Testing existence, accessibility, size of files.
* Contents of Directories::   Getting a list of the files in a directory.
* Changing File Attributes::  Renaming files, changing protection, etc.
* File Names::                Decomposing and expanding file names.

Visiting Files

* Visiting Functions::      The usual interface functions for visiting.
* Subroutines of Visiting:: Lower-level subroutines that they use.

Information about Files

* Testing Accessibility::   Is a given file readable?  Writable?
* Kinds of Files::          Is it a directory?  A link?
* File Attributes::         How large is it?  Any other names?  Etc.

File Names

* File Name Components::    The directory part of a file name, and the rest.
* Directory Names::         A directory's name as a directory
                              is different from its name as a file.
* Relative File Names::     Some file names are relative to a
                              current directory.
* File Name Expansion::     Converting relative file names to absolute ones.
* Unique File Names::       Generating names for temporary files.
* File Name Completion::    Finding the completions for a given file name.

Backups and Auto-Saving

* Backup Files::            How backup files are made; how their names
                              are chosen.
* Auto-Saving::             How auto-save files are made; how their
                              names are chosen.
* Reverting::               @code{revert-buffer}, and how to customize
                              what it does.

Backup Files

* Making Backups::          How Emacs makes backup files, and when.
* Rename or Copy::          Two alternatives: renaming the old file
                              or copying it.
* Numbered Backups::        Keeping multiple backups for each source file.
* Backup Names::            How backup file names are computed; customization.

Buffers

* Buffer Basics::           What is a buffer?
* Buffer Names::            Accessing and changing buffer names.
* Buffer File Name::        The buffer file name indicates which file
                              is visited.
* Buffer Modification::     A buffer is @dfn{modified} if it needs to be saved.
* Modification Time::       Determining whether the visited file was changed
                              ``behind Emacs's back''.
* Read Only Buffers::       Modifying text is not allowed in a
                              read-only buffer.
* The Buffer List::         How to look at all the existing buffers.
* Creating Buffers::        Functions that create buffers.
* Killing Buffers::         Buffers exist until explicitly killed.
* Current Buffer::          Designating a buffer as current
                              so primitives will access its contents.

Windows

* Basic Windows::           Basic information on using windows.
* Splitting Windows::       Splitting one window into two windows.
* Deleting Windows::        Deleting a window gives its space to other windows.
* Selecting Windows::       The selected window is the one that you edit in.
* Cyclic Window Ordering::  Moving around the existing windows.
* Buffers and Windows::     Each window displays the contents of a buffer.
* Displaying Buffers::      Higher-lever functions for displaying a buffer
                              and choosing a window for it.
* Window Point::            Each window has its own location of point.
* Window Start::            The display-start position controls which text
                              is on-screen in the window.
* Vertical Scrolling::      Moving text up and down in the window.
* Horizontal Scrolling::    Moving text sideways on the window.
* Size of Window::          Accessing the size of a window.
* Resizing Windows::        Changing the size of a window.
* Window Configurations::   Saving and restoring the state of the screen.

Frames

* Creating Frames::         Creating additional frames.
* Multiple Displays::       Creating frames on other X displays.
* Frame Parameters::        Controlling frame size, position, font, etc.
* Frame Titles::            Automatic updating of frame titles.
* Deleting Frames::         Frames last until explicitly deleted.
* Finding All Frames::      How to examine all existing frames.
* Frames and Windows::      A frame contains windows;
                              display of text always works through windows.
* Minibuffers and Frames::  How a frame finds the minibuffer to use.
* Input Focus::             Specifying the selected frame.
* Visibility of Frames::    Frames may be visible or invisible, or icons.
* Raising and Lowering::    Raising a frame makes it hide other X windows;
                              lowering it makes the others hide them.
* Frame Configurations::    Saving the state of all frames.
* Mouse Tracking::          Getting events that say when the mouse moves.
* Mouse Position::          Asking where the mouse is, or moving it.
* Pop-Up Menus::            Displaying a menu for the user to select from.
* Dialog Boxes::            Displaying a box to ask yes or no.
* Pointer Shapes::          Specifying the shape of the mouse pointer.
* X Selections::            Transferring text to and from other X clients.
* Color Names::             Getting the definitions of color names.
* Resources::               Getting resource values from the server.
* Server Data::             Getting info about the X server.

Positions

* Point::                   The special position where editing takes place.
* Motion::                  Changing point.
* Excursions::              Temporary motion and buffer changes.
* Narrowing::               Restricting editing to a portion of the buffer.

Motion

* Character Motion::        Moving in terms of characters.
* Word Motion::             Moving in terms of words.
* Buffer End Motion::       Moving to the beginning or end of the buffer.
* Text Lines::              Moving in terms of lines of text.
* Screen Lines::            Moving in terms of lines as displayed.
* List Motion::             Moving by parsing lists and sexps.
* Skipping Characters::     Skipping characters belonging to a certain set.

Markers

* Overview of Markers::     The components of a marker, and how it relocates.
* Predicates on Markers::   Testing whether an object is a marker.
* Creating Markers::        Making empty markers or markers at certain places.
* Information from Markers::  Finding the marker's buffer or character
                                position.
* Changing Markers::        Moving the marker to a new buffer or position.
* The Mark::                How ``the mark'' is implemented with a marker.
* The Region::              How to access ``the region''.

Text

* Near Point::              Examining text in the vicinity of point.
* Buffer Contents::         Examining text in a general fashion.
* Insertion::               Adding new text to a buffer.
* Commands for Insertion::  User-level commands to insert text.
* Deletion::                Removing text from a buffer.
* User-Level Deletion::     User-level commands to delete text.
* The Kill Ring::           Where removed text sometimes is saved for
                              later use.
* Undo::                    Undoing changes to the text of a buffer.
* Auto Filling::            How auto-fill mode is implemented to break lines.
* Filling::                 Functions for explicit filling.
* Margins::                 How to specify margins for filling commands.
* Sorting::                 Functions for sorting parts of the buffer.
* Indentation::             Functions to insert or adjust indentation.
* Columns::                 Computing horizontal positions, and using them.
* Case Changes::            Case conversion of parts of the buffer.
* Substitution::            Replacing a given character wherever it appears.
* Registers::               How registers are implemented.  Accessing
                              the text or position stored in a register.

The Kill Ring

* Kill Ring Concepts::      What text looks like in the kill ring.
* Kill Functions::          Functions that kill text.
* Yank Commands::           Commands that access the kill ring.
* Low-Level Kill Ring::     Functions and variables for kill ring access.
* Internals of Kill Ring::  Variables that hold kill-ring data.

Indentation

* Primitive Indent::        Functions used to count and insert indentation.
* Mode-Specific Indent::    Customize indentation for different modes.
* Region Indent::           Indent all the lines in a region.
* Relative Indent::         Indent the current line based on previous lines.
* Indent Tabs::             Adjustable, typewriter-like tab stops.
* Motion by Indent::        Move to first non-blank character.

Searching and Matching

* String Search::           Search for an exact match.
* Regular Expressions::     Describing classes of strings.
* Regexp Search::           Searching for a match for a regexp.
* Match Data::              Finding out which part of the text matched
                              various parts of a regexp, after regexp search.
* Saving Match Data::       Saving and restoring this information.
* Standard Regexps::        Useful regexps for finding sentences, pages,...
* Searching and Case::      Case-independent or case-significant searching.

Regular Expressions

* Syntax of Regexps::       Rules for writing regular expressions.
* Regexp Example::          Illustrates regular expression syntax.

Syntax Tables

* Syntax Descriptors::      How characters are classified.
* Syntax Table Functions::  How to create, examine and alter syntax tables.
* Parsing Expressions::     Parsing balanced expressions
                              using the syntax table.
* Standard Syntax Tables::  Syntax tables used by various major modes.
* Syntax Table Internals::  How syntax table information is stored.

Syntax Descriptors

* Syntax Class Table::      Table of syntax classes.
* Syntax Flags::            Additional flags each character can have.

Abbrevs And Abbrev Expansion

* Abbrev Mode::             Setting up Emacs for abbreviation.
* Tables: Abbrev Tables.    Creating and working with abbrev tables.
* Defining Abbrevs::        Specifying abbreviations and their expansions.
* Files: Abbrev Files.      Saving abbrevs in files.
* Expansion: Abbrev Expansion.  Controlling expansion; expansion subroutines.
* Standard Abbrev Tables::  Abbrev tables used by various major modes.

Processes

* Subprocess Creation::     Functions that start subprocesses.
* Synchronous Processes::   Details of using synchronous subprocesses.
* Asynchronous Processes::  Starting up an asynchronous subprocess.
* Deleting Processes::      Eliminating an asynchronous subprocess.
* Process Information::     Accessing run-status and other attributes.
* Input to Processes::      Sending input to an asynchronous subprocess.
* Signals to Processes::    Stopping, continuing or interrupting
                              an asynchronous subprocess.
* Output from Processes::   Collecting output from an asynchronous subprocess.
* Sentinels::               Sentinels run when process run-status changes.
* Network::                 Opening network connections.

Receiving Output from Processes

* Process Buffers::         If no filter, output is put in a buffer.
* Filter Functions::        Filter functions accept output from the process.
* Accepting Output::        How to wait until process output arrives.

Operating System Interface

* Starting Up::             Customizing Emacs start-up processing.
* Getting Out::             How exiting works (permanent or temporary).
* System Environment::      Distinguish the name and kind of system.
* Terminal Input::          Recording terminal input for debugging.
* Terminal Output::         Recording terminal output for debugging.
* Flow Control::            How to turn output flow control on or off.
* Batch Mode::              Running Emacs without terminal interaction.

Starting Up Emacs

* Start-up Summary::        Sequence of actions Emacs performs at start-up.
* Init File::               Details on reading the init file (@file{.emacs}).
* Terminal-Specific::       How the terminal-specific Lisp file is read.
* Command Line Arguments::  How command line arguments are processed,
                              and how you can customize them.

Getting out of Emacs

* Killing Emacs::           Exiting Emacs irreversibly.
* Suspending Emacs::        Exiting Emacs reversibly.

Emacs Display

* Refresh Screen::          Clearing the screen and redrawing everything on it.
* Truncation::              Folding or wrapping long text lines.
* The Echo Area::           Where messages are displayed.
* Selective Display::       Hiding part of the buffer text.
* Overlay Arrow::           Display of an arrow to indicate position.
* Temporary Displays::      Displays that go away automatically.
* Waiting::                 Forcing display update and waiting for user.
* Blinking::                How Emacs shows the matching open parenthesis.
* Usual Display::           How control characters are displayed.
* Beeping::                 Audible signal to the user.
* Window Systems::          Which window system is being used.

GNU Emacs Internals

* Building Emacs::          How to preload Lisp libraries into Emacs.
* Pure Storage::            A kludge to make preloaded Lisp functions sharable.
* Garbage Collection::      Reclaiming space for Lisp objects no longer used.
* Object Internals::        Data formats of buffers, windows, processes.
* Writing Emacs Primitives::  Writing C code for Emacs.

Object Internals

* Buffer Internals::        Components of a buffer structure.
* Window Internals::        Components of a window structure.
* Process Internals::       Components of a process structure.
@end menu

@c ================ Volume 1 ================

@c include intro.texi
@c include objects.texi
@c include numbers.texi
@c include strings.texi

@c include lists.texi
@c include sequences.texi
@c include symbols.texi
@c include eval.texi

@c include control.texi
@c include variables.texi
@c include functions.texi
@c include macros.texi

@c include loading.texi
@c include compile.texi
@c include debugging.texi
@c include streams.texi

@c include minibuf.texi
@c include commands.texi
@c include keymaps.texi
@c include modes.texi

@c ================ Beginning of Volume 2 ================

@include help.texi
@include files.texi
@include backups.texi
@include buffers.texi

@include windows.texi
@include frames.texi
@include positions.texi
@include markers.texi
@include text.texi

@include searching.texi
@include syntax.texi
@include abbrevs.texi

@include processes.texi
@include os.texi
@include display.texi
@include calendar.texi

@c MOVE to Emacs Manual:  include misc-modes.texi

@c appendices

@c  REMOVE this:  include non-hacker.texi

@include tips.texi
@include internals.texi
@include errors.texi
@include locals.texi
@include maps.texi
@include hooks.texi

@include index-vol2.texi

@page
@c Print the tables of contents
@summarycontents
@contents
@c That's all

@bye

\f
These words prevent "local variables" above from confusing Emacs.

@ignore
   arch-tag: dfdbecf8-fec2-49c1-8427-3e8ac8b0b849
@end ignore