mdw@git.distorted.org.uk Git - runlisp/blob - mdwsetup.py

   1 ### -*-python-*-
   2 ###
   3 ### Utility module for Python build systems
   4 ###
   5 ### (c) 2009 Straylight/Edgeware
   6 ###
   7
   8 ###----- Licensing notice ---------------------------------------------------
   9 ###
  10 ### This file is part of the Common Files Distribution (`common')
  11 ###
  12 ### `Common' is free software; you can redistribute it and/or modify
  13 ### it under the terms of the GNU General Public License as published by
  14 ### the Free Software Foundation; either version 2 of the License, or
  15 ### (at your option) any later version.
  16 ###
  17 ### `Common' is distributed in the hope that it will be useful,
  18 ### but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ### GNU General Public License for more details.
  21 ###
  22 ### You should have received a copy of the GNU General Public License
  23 ### along with `common'; if not, write to the Free Software Foundation,
  24 ### Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  25
  26 from __future__ import with_statement
  27
  28 import sys as SYS
  29 import os as OS
  30 import re as RE
  31 import subprocess as SUB
  32
  33 import distutils.core as DC
  34 import distutils.log as DL
  35
  36 ###--------------------------------------------------------------------------
  37 ### Random utilities.
  38
  39 def uniquify(seq):
  40   """
  41   Return a list of the elements of SEQ, with duplicates removed.
  42
  43   Only the first occurrence (according to `==') is left.
  44   """
  45   seen = {}
  46   out = []
  47   for item in seq:
  48     if item not in seen:
  49       seen[item] = True
  50       out.append(item)
  51   return out
  52
  53 ###--------------------------------------------------------------------------
  54 ### Subprocess hacking.
  55
  56 class SubprocessFailure (Exception):
  57   def __init__(me, file, rc):
  58     me.args = (file, rc)
  59     me.file = file
  60     me.rc = rc
  61   def __str__(me):
  62     if OS.WIFEXITED(me.rc):
  63       return '%s failed (rc = %d)' % (me.file, OS.WEXITSTATUS(me.rc))
  64     elif OS.WIFSIGNALED(me.rc):
  65       return '%s died (signal %d)' % (me.file, OS.WTERMSIG(me.rc))
  66     else:
  67       return '%s died inexplicably' % (me.file)
  68
  69 def progoutput(command):
  70   """
  71   Run the shell COMMAND and return its standard output.
  72
  73   The COMMAND must produce exactly one line of output, and must exit with
  74   status zero.
  75   """
  76   kid = SUB.Popen(command, stdout = SUB.PIPE)
  77   try:
  78     out = kid.stdout.readline()
  79     junk = kid.stdout.read()
  80   finally:
  81     kid.stdout.close()
  82   if junk != '': raise ValueError \
  83     ("Child process `%s' produced unspected output %r" % (command, junk))
  84   rc = kid.wait()
  85   if rc != 0: raise SubprocessFailure(command, rc)
  86   return out.rstrip('\n')
  87
  88 ###--------------------------------------------------------------------------
  89 ### External library packages.
  90
  91 INCLUDEDIRS = []
  92 LIBDIRS = []
  93 LIBS = []
  94
  95 def pkg_config(pkg, version):
  96   """
  97   Find the external package PKG and store the necessary compiler flags.
  98
  99   The include-directory names are stored in INCLUDEDIRS; the
 100   library-directory names are in LIBDIRS; and the library names themselves
 101   are in LIBS.
 102   """
 103
 104   def weird(what, word):
 105     raise ValueError \
 106       ("Unexpected `%s' item `%s' from package `%s'" % (what, word, pkg))
 107
 108   spec = '%s >= %s' % (pkg, version)
 109
 110   try: cflags = OS.environ["%s_CFLAGS" % pkg]
 111   except KeyError: cflags = progoutput(['pkg-config', '--cflags', spec])
 112   for word in cflags.split():
 113     if word.startswith('-I'): INCLUDEDIRS.append(word[2:])
 114     else: weird('CFLAGS', word)
 115   try: libs = OS.environ["%s_LIBS" % pkg]
 116   except KeyError: libs = progoutput(['pkg-config', '--libs', spec])
 117   for word in libs.split():
 118     if word.startswith('-L'): LIBDIRS.append(word[2:])
 119     elif word.startswith('-l'): LIBS.append(word[2:])
 120     else: weird('LIBS', word)
 121
 122 ###--------------------------------------------------------------------------
 123 ### Substituting variables in files.
 124
 125 class BaseGenFile (object):
 126   """
 127   A base class for file generators.
 128
 129   Instances of subclasses are suitable for listing in the `genfiles'
 130   attribute, passed to `setup'.
 131
 132   Subclasses need to implement `_gen', which should simply do the work of
 133   generating the target file from its sources.  This class will print
 134   progress messages and check whether the target actually needs regenerating.
 135   """
 136   def __init__(me, target, sources = []):
 137     me.target = target
 138     me.sources = sources
 139   def _needs_update_p(me):
 140     if not OS.path.exists(me.target): return True
 141     t_target = OS.stat(me.target).st_mtime
 142     for s in me.sources:
 143       if OS.stat(s).st_mtime >= t_target: return True
 144     return False
 145   def gen(me, dry_run_p = False):
 146     if not me._needs_update_p(): return
 147     DL.log(DL.INFO, "generate `%s' from %s", me.target,
 148            ', '.join("`%s'" % s for s in me.sources))
 149     if not dry_run_p: me._gen()
 150   def clean(me, dry_run_p):
 151     if not OS.path.exists(me.target): return
 152     DL.log(DL.INFO, "delete `%s'", me.target)
 153     if not dry_run_p: OS.remove(me.target)
 154
 155 class Derive (BaseGenFile):
 156   """
 157   Derive TARGET from SOURCE by making simple substitutions.
 158
 159   The SOURCE may contain markers %FOO%; these are replaced by SUBSTMAP['FOO']
 160   in the TARGET file.
 161   """
 162   RX_SUBST = RE.compile(r'\%(\w+)\%')
 163   def __init__(me, target, source, substmap):
 164     BaseGenFile.__init__(me, target, [source])
 165     me._map = substmap
 166   def _gen(me):
 167     temp = me.target + '.new'
 168     with open(temp, 'w') as ft:
 169       with open(me.sources[0], 'r') as fs:
 170         for line in fs:
 171           ft.write(me.RX_SUBST.sub((lambda m: me._map[m.group(1)]), line))
 172     OS.rename(temp, me.target)
 173
 174 class Generate (BaseGenFile):
 175   """
 176   Generate TARGET by running the SOURCE Python script.
 177
 178   If SOURCE is omitted, replace the extension of TARGET by `.py'.
 179   """
 180   def __init__(me, target, source = None):
 181     if source is None: source = OS.path.splitext(target)[0] + '.py'
 182     BaseGenFile.__init__(me, target, [source])
 183   def _gen(me):
 184     temp = me.target + '.new'
 185     with open(temp, 'w') as ft:
 186       rc = SUB.call([SYS.executable, me.sources[0]], stdout = ft)
 187     if rc != 0: raise SubprocessFailure(me.sources[0], rc << 8)
 188     OS.rename(temp, me.target)
 189
 190 ## Backward compatibility.
 191 def derive(target, source, substmap): Derive(target, source, substmap).gen()
 192 def generate(target, source = None): Generate(target, source).gen()
 193
 194 ###--------------------------------------------------------------------------
 195 ### Discovering version numbers.
 196
 197 def auto_version(writep = True):
 198   """
 199   Returns the package version number.
 200
 201   As a side-effect, if WRITEP is true, then write the version number to the
 202   RELEASE file so that it gets included in distributions.
 203
 204   All of this is for backwards compatibility.  New projects should omit the
 205   `version' keyword entirely and let `setup' discover it and write it into
 206   tarballs automatically.
 207   """
 208   version = progoutput(['./auto-version'])
 209   if writep:
 210     with open('RELEASE.new', 'w') as ft: ft.write('%s\n' % version)
 211     OS.rename('RELEASE.new', 'RELEASE')
 212   return version
 213
 214 ###--------------------------------------------------------------------------
 215 ### Adding new commands.
 216
 217 CMDS = {}
 218
 219 class CommandClass (type):
 220   """
 221   Metaclass for command classes: automatically adds them to the `CMDS' map.
 222   """
 223   def __new__(cls, name, supers, dict):
 224     c = super(CommandClass, cls).__new__(cls, name, supers, dict)
 225     try: name = c.NAME
 226     except AttributeError: pass
 227     else: CMDS[name] = c
 228     return c
 229
 230 class Command (DC.Command, object):
 231   """
 232   Base class for `mdwsetup' command classes.
 233
 234   This provides the automatic registration machinery, via the metaclass, and
 235   also trivial implementations of various responsibilities of `DC.Command'
 236   methods and attributes.
 237   """
 238   __metaclass__ = CommandClass
 239   user_options = []
 240   def initialize_options(me): pass
 241   def finalize_options(me): pass
 242   def run_subs(me):
 243     for s in me.get_sub_commands(): me.run_command(s)
 244
 245 ###--------------------------------------------------------------------------
 246 ### Some handy new commands.
 247
 248 class distdir (Command):
 249   NAME = 'distdir'
 250   description = "print the distribution directory name to stdout"
 251   def run(me):
 252     d = me.distribution
 253     print '%s-%s' % (d.get_name(), d.get_version())
 254
 255 class build_gen(Command):
 256   """
 257   Generate files, according to the `genfiles'.
 258
 259   The `genfiles' keyword argument to `setup' lists a number of objects which
 260   guide the generation of output files.  These objects must implement the
 261   following methods.
 262
 263   clean(DRY_RUN_P)      Remove the output files.
 264
 265   gen(DRY_RUN_P)        Generate the output files, if they don't exist or are
 266                         out of date with respect to their prerequisites.
 267
 268   If DRY_RUN_P is true then the methods must not actually do anything with a
 269   lasting effect, but should print progress messages as usual.
 270   """
 271   NAME = 'build_gen'
 272   description = "build generated source files"
 273   def run(me):
 274     d = me.distribution
 275     for g in d.genfiles: g.gen(dry_run_p = me.dry_run)
 276
 277 from distutils.command.build import build as _build
 278 class build (_build, Command):
 279   ## Add `build_gen' early in the list of subcommands.
 280   NAME = 'build'
 281   sub_commands = [('build_gen', lambda me: me.distribution.genfiles)]
 282   sub_commands += _build.sub_commands
 283
 284 class clean_gen(Command):
 285   """
 286   Remove the generated files, as listed in `genfiles'.
 287
 288   See the `build_gen' command for more detailed information.
 289   """
 290   NAME = 'clean_gen'
 291   description = "clean generated source files"
 292   def run(me):
 293     d = me.distribution
 294     for g in d.genfiles: g.clean(dry_run_p = me.dry_run)
 295
 296 class clean_others(Command):
 297   """
 298   Remove the files listed in the `cleanfiles' argument to `setup'.
 299   """
 300   NAME = 'clean_others'
 301   description = "clean miscellaneous output files"
 302   def run(me):
 303     d = me.distribution
 304     for f in d.cleanfiles:
 305       if not OS.path.exists(f): continue
 306       DL.log(DL.INFO, "delete `%s'", f)
 307       if not me.dry_run: OS.remove(f)
 308
 309 from distutils.command.clean import clean as _clean
 310 class clean (_clean, Command):
 311   ## Add `clean_gen' and `clean_others' to the list of subcommands.
 312   NAME = 'clean'
 313   sub_commands = [('clean_gen', lambda me: me.distribution.genfiles),
 314                   ('clean_others', lambda me: me.distribution.cleanfiles)]
 315   sub_commands += _clean.sub_commands
 316   def run(me):
 317     me.run_subs()
 318     _clean.run(me)
 319
 320 from distutils.command.sdist import sdist as _sdist
 321 class sdist (_sdist, Command):
 322   ## Write a `RELEASE' file to the output, if we extracted the version number
 323   ## from version control.  Also arrange to dereference symbolic links while
 324   ## copying.  Symlinks to directories will go horribly wrong, so don't do
 325   ## that.
 326   NAME = 'sdist'
 327   def make_release_tree(me, base_dir, files):
 328     _sdist.make_release_tree(me, base_dir, files)
 329     d = me.distribution
 330     if d._auto_version_p:
 331       v = d.metadata.get_version()
 332       DL.log(DL.INFO, "write `RELEASE' file: %s" % v)
 333       with open(OS.path.join(base_dir, 'RELEASE'), 'w') as f:
 334         f.write('%s\n' % v)
 335   def copy_file(me, infile, outfile, link = None, *args, **kw):
 336     if OS.path.islink(infile): link = None
 337     return _sdist.copy_file(me, infile, outfile, link = link, *args, **kw)
 338
 339 ###--------------------------------------------------------------------------
 340 ### Our own version of `setup'.
 341
 342 class Dist (DC.Distribution):
 343   ## Like the usual version, but with some additional attributes to support
 344   ## our enhanced commands.
 345   def __init__(me, attrs = None):
 346     me.genfiles = []
 347     me.cleanfiles = []
 348     me._auto_version_p = False
 349     DC.Distribution.__init__(me, attrs)
 350     if me.metadata.version is None:
 351       me.metadata.version = auto_version(writep = False)
 352       me._auto_version_p = True
 353     me.cleanfiles = set(me.cleanfiles)
 354     me.cleanfiles.add('MANIFEST')
 355
 356 def setup(cmdclass = {}, distclass = Dist, **kw):
 357   ## Like the usual version, but provides defaults more suited to our
 358   ## purposes.
 359   cmds = dict()
 360   cmds.update(CMDS)
 361   cmds.update(cmdclass)
 362   DC.setup(cmdclass = cmds, distclass = distclass, **kw)
 363
 364 ###----- That's all, folks --------------------------------------------------