pyx/filelocator.py

   1 # -*- encoding: utf-8 -*-
   2 #
   3 #
   4 # Copyright (C) 2011 Jörg Lehmann <joergl@users.sourceforge.net>
   5 # Copyright (C) 2009-2011 André Wobst <wobsta@users.sourceforge.net>
   6 #
   7 # This file is part of PyX (http://pyx.sourceforge.net/).
   8 #
   9 # PyX is free software; you can redistribute it and/or modify
  10 # it under the terms of the GNU General Public License as published by
  11 # the Free Software Foundation; either version 2 of the License, or
  12 # (at your option) any later version.
  13 #
  14 # PyX is distributed in the hope that it will be useful,
  15 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 # GNU General Public License for more details.
  18 #
  19 # You should have received a copy of the GNU General Public License
  20 # along with PyX; if not, write to the Free Software
  21 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
  22
  23 builtinopen = open
  24
  25 import os, cStringIO, warnings, pkgutil
  26
  27 import config, pycompat
  28
  29 try:
  30     import pykpathsea as pykpathsea_module
  31     has_pykpathsea = True
  32 except ImportError:
  33     has_pykpathsea = False
  34
  35
  36 # Locators implement an open method which returns a list of functions
  37 # by searching for a file according to a specific rule. Each of the functions
  38 # returned can be called (multiple times) and return an open file. The
  39 # opening of the file might fail with a IOError which indicates, that the
  40 # file could not be found at the given location.
  41 # names is a list of kpsewhich format names to be used for searching where as
  42 # extensions is a list of file extensions to be tried (including the dot). Note
  43 # that the list of file extenions should include an empty string to not add
  44 # an extension at all.
  45
  46 locator_classes = {}
  47
  48 class local:
  49     """locates files in the current directory"""
  50
  51     def openers(self, filename, names, extensions, mode):
  52         return [lambda: builtinopen(filename+extension, mode) for extension in extensions]
  53
  54 locator_classes["local"] = local
  55
  56
  57 class internal_pkgutil:
  58     """locates files within the PyX data tree (via pkgutil)"""
  59
  60     def openers(self, filename, names, extensions, mode):
  61         for extension in extensions:
  62             full_filename = filename+extension
  63             dir = os.path.splitext(full_filename)[1][1:]
  64             try:
  65                 data = pkgutil.get_data("pyx", "data/%s/%s" % (dir, full_filename))
  66             except IOError:
  67                 pass
  68             else:
  69                 if data:
  70                     # ignoring mode?!
  71                     return [lambda: cStringIO.StringIO(data)]
  72         return []
  73
  74 class internal_open:
  75     """locates files within the PyX data tree (via an open relative to the path of this file)"""
  76
  77     def openers(self, filename, names, extensions, mode):
  78         result = []
  79         for extension in extensions:
  80             full_filename = filename+extension
  81             dir = os.path.splitext(full_filename)[1][1:]
  82             result.append(lambda: builtinopen(os.path.join(os.path.dirname(__file__), "data", dir, full_filename), mode))
  83         return result
  84
  85 try:
  86     pkgutil.get_data
  87 except AttributeError:
  88     locator_classes["internal"] = internal_open # fallback for python < 2.6
  89 else:
  90     locator_classes["internal"] = internal_pkgutil
  91
  92
  93 class recursivedir:
  94     """locates files by searching recursively in a list of directories"""
  95
  96     def __init__(self):
  97         self.dirs = config.getlist("locator", "recursivedir")
  98         self.full_filenames = {}
  99
 100     def openers(self, filename, names, extensions, mode):
 101         for extension in extensions:
 102             if filename+extension in self.full_filenames:
 103                 return [lambda: builtinopen(self.full_filenames[filename], mode)]
 104         while self.dirs:
 105             dir = self.dirs.pop(0)
 106             for item in os.listdir(dir):
 107                 full_item = os.path.join(dir, item)
 108                 if os.path.isdir(full_item):
 109                     self.dirs.insert(0, full_item)
 110                 else:
 111                     self.full_filenames[item] = full_item
 112             for extension in extensions:
 113                 if filename+extension in self.full_filenames:
 114                     return [lambda: builtinopen(self.full_filenames[filename], mode)]
 115         return []
 116
 117 locator_classes["recursivedir"] = recursivedir
 118
 119
 120 class ls_R:
 121     """locates files by searching a list of ls-R files"""
 122
 123     def __init__(self):
 124         self.ls_Rs = config.getlist("locator", "ls-R")
 125         self.full_filenames = {}
 126
 127     def openers(self, filename, names, extensions, mode):
 128         while self.ls_Rs and not any([filename+extension in self.full_filenames for extension in extensions]):
 129             lsr = self.ls_Rs.pop(0)
 130             base_dir = os.path.dirname(lsr)
 131             dir = None
 132             first = True
 133             for line in builtinopen(lsr):
 134                 line = line.rstrip()
 135                 if first and line.startswith("%"):
 136                     continue
 137                 first = False
 138                 if line.endswith(":"):
 139                     dir = os.path.join(base_dir, line[:-1])
 140                 elif line:
 141                     self.full_filenames[line] = os.path.join(dir, line)
 142         for extension in extensions:
 143             if filename+extension in self.full_filenames:
 144                 def _opener():
 145                     try:
 146                         return builtinopen(self.full_filenames[filename+extension], mode)
 147                     except IOError:
 148                         warnings.warn("'%s' should be available at '%s' according to the ls-R file, "
 149                                       "but the file is not available at this location; "
 150                                       "update your ls-R file" % (filename, self.full_filenames[filename]))
 151                 return [_opener]
 152         return []
 153
 154 locator_classes["ls-R"] = ls_R
 155
 156
 157 class pykpathsea:
 158     """locate files by pykpathsea (a C extension module wrapping libkpathsea)"""
 159
 160     def openers(self, filename, names, extensions, mode):
 161         if not has_pykpathsea:
 162             return []
 163         for name in names:
 164             full_filename = pykpathsea_module.find_file(filename, name)
 165             if full_filename:
 166                 break
 167         else:
 168             return []
 169         def _opener():
 170             try:
 171                 return builtinopen(full_filename, mode)
 172             except IOError:
 173                 warnings.warn("'%s' should be available at '%s' according to libkpathsea, "
 174                               "but the file is not available at this location; "
 175                               "update your kpsewhich database" % (filename, full_filename))
 176         return [_opener]
 177
 178 locator_classes["pykpathsea"] = pykpathsea
 179
 180
 181 # class libkpathsea:
 182 #     """locate files by libkpathsea using ctypes"""
 183 #
 184 #     def openers(self, filename, names, extensions, mode):
 185 #         raise NotImplemented
 186 #
 187 # locator_classes["libpathsea"] = libkpathsea
 188
 189
 190 class kpsewhich:
 191     """locate files using the kpsewhich executable"""
 192
 193     def openers(self, filename, names, extensions, mode):
 194         for name in names:
 195             try:
 196                 full_filenames = pycompat.popen('kpsewhich --format="%s" "%s"' % (name, filename)).read()
 197             except OSError:
 198                 return []
 199             if full_filenames:
 200                 break
 201         else:
 202             return []
 203         full_filename = full_filenames.split("\n")[0]
 204         def _opener():
 205             try:
 206                 return builtinopen(full_filename, mode)
 207             except IOError:
 208                 warnings.warn("'%s' should be available at '%s' according to kpsewhich, "
 209                               "but the file is not available at this location; "
 210                               "update your kpsewhich database" % (filename, full_filename))
 211         return [_opener]
 212
 213 locator_classes["kpsewhich"] = kpsewhich
 214
 215
 216 class locate:
 217     """locate files using a locate executable"""
 218
 219     def openers(self, filename, names, extensions, mode):
 220         for extension in extensions:
 221             full_filenames = pycompat.popen("locate \"%s\"" % (filename+extension)).read()
 222             if full_filenames:
 223                 break
 224         else:
 225             return []
 226         full_filename = full_filenames.split("\n")[0]
 227         def _opener():
 228             try:
 229                 return builtinopen(full_filenames, mode)
 230             except IOError:
 231                 warnings.warn("'%s' should be available at '%s' according to the locate, "
 232                               "but the file is not available at this location; "
 233                               "update your locate database" % (filename, self.full_filenames[filename]))
 234         return [_opener]
 235
 236 locator_classes["locate"] = locate
 237
 238
 239 def init():
 240     global methods, opener_cache
 241     methods = [locator_classes[method]()
 242                for method in config.getlist("filelocator", "methods", ["local", "internal", "pykpathsea", "kpsewhich"])]
 243     opener_cache = {}
 244
 245
 246 def open(filename, formats, mode="r"):
 247     """returns an open file searched according the list of formats"""
 248
 249     # When using an empty list of formats, the names list is empty
 250     # and the extensions list contains an empty string only. For that
 251     # case some locators (notably local and internal) return an open
 252     # function for the requested file whereas other locators might not
 253     # return anything (like pykpathsea and kpsewhich).
 254     # This is useful for files not to be searched in the latex
 255     # installation at all (like lfs files).
 256     extensions = pycompat.set([""])
 257     for format in formats:
 258         for extension in format.extensions:
 259             extensions.add(extension)
 260     names = tuple([format.name for format in formats])
 261     if (filename, names) in opener_cache:
 262         return opener_cache[(filename, names)]()
 263     for method in methods:
 264         openers = method.openers(filename, names, extensions, mode)
 265         for opener in openers:
 266             try:
 267                 file = opener()
 268             except IOError:
 269                 file = None
 270             if file:
 271                 opener_cache[(filename, names)] = opener
 272                 return file
 273     raise IOError("Could not locate the file '%s'." % filename)
 274
 275
 276 class format:
 277     def __init__(self, name, extensions):
 278         self.name = name
 279         self.extensions = extensions
 280
 281 format.tfm = format("tfm", [".tfm"])
 282 format.afm = format("afm", [".afm"])
 283 format.fontmap = format("map", [])
 284 format.pict = format("graphics/figure", [".eps", ".epsi"])
 285 format.tex_ps_header = format("PostScript header", [".pro"])                    # contains also: enc files
 286 format.type1 = format("type1 fonts", [".pfa", ".pfb"])
 287 format.vf = format("vf", [".vf"])
 288 format.dvips_config = format("dvips config", [])