mdw@git.distorted.org.uk Git - cfd/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   out = kid.stdout.readline()
  78   junk = kid.stdout.read()
  79   if junk != '': raise ValueError \
  80     ("Child process `%s' produced unspected output %r" % (command, junk))
  81   rc = kid.wait()
  82   if rc != 0: raise SubprocessFailure(command, rc)
  83   return out.rstrip('\n')
  84
  85 ###--------------------------------------------------------------------------
  86 ### External library packages.
  87
  88 INCLUDEDIRS = []
  89 LIBDIRS = []
  90 LIBS = []
  91
  92 def pkg_config(pkg, version):
  93   """
  94   Find the external package PKG and store the necessary compiler flags.
  95
  96   The include-directory names are stored in INCLUDEDIRS; the
  97   library-directory names are in LIBDIRS; and the library names themselves
  98   are in LIBS.
  99   """
 100
 101   def weird(what, word):
 102     raise ValueError \
 103       ("Unexpected `%s' item `%s' from package `%s'" % (what, word, pkg))
 104
 105   spec = '%s >= %s' % (pkg, version)
 106
 107   for word in progoutput(['pkg-config', '--cflags', spec]).split():
 108     if word.startswith('-I'): INCLUDEDIRS.append(word[2:])
 109     else: weird('CFLAGS', word)
 110
 111   for word in progoutput(['pkg-config', '--libs', spec]).split():
 112     if word.startswith('-L'): LIBDIRS.append(word[2:])
 113     elif word.startswith('-l'): LIBS.append(word[2:])
 114     else: weird('LIBS', word)
 115
 116 ###--------------------------------------------------------------------------
 117 ### Substituting variables in files.
 118
 119 class BaseGenFile (object):
 120   """
 121   A base class for file generators.
 122
 123   Instances of subclasses are suitable for listing in the `genfiles'
 124   attribute, passed to `setup'.
 125
 126   Subclasses need to implement `_gen', which should simply do the work of
 127   generating the target file from its sources.  This class will print
 128   progress messages and check whether the target actually needs regenerating.
 129   """
 130   def __init__(me, target, sources = []):
 131     me.target = target
 132     me.sources = sources
 133   def _needs_update_p(me):
 134     if not OS.path.exists(me.target): return True
 135     t_target = OS.stat(me.target).st_mtime
 136     for s in me.sources:
 137       if OS.stat(s).st_mtime >= t_target: return True
 138     return False
 139   def gen(me, dry_run_p = False):
 140     if not me._needs_update_p(): return
 141     DL.log(DL.INFO, "generate `%s' from %s", me.target,
 142            ', '.join("`%s'" % s for s in me.sources))
 143     if not dry_run_p: me._gen()
 144   def clean(me, dry_run_p):
 145     if not OS.path.exists(me.target): return
 146     DL.log(DL.INFO, "delete `%s'", me.target)
 147     if not dry_run_p: OS.remove(me.target)
 148
 149 class Derive (BaseGenFile):
 150   """
 151   Derive TARGET from SOURCE by making simple substitutions.
 152
 153   The SOURCE may contain markers %FOO%; these are replaced by SUBSTMAP['FOO']
 154   in the TARGET file.
 155   """
 156   RX_SUBST = RE.compile(r'\%(\w+)\%')
 157   def __init__(me, target, source, substmap):
 158     BaseGenFile.__init__(me, target, [source])
 159     me._map = substmap
 160   def _gen(me):
 161     temp = me.target + '.new'
 162     with open(temp, 'w') as ft:
 163       with open(me.sources[0], 'r') as fs:
 164         for line in fs:
 165           ft.write(me.RX_SUBST.sub((lambda m: me._map[m.group(1)]), line))
 166     OS.rename(temp, me.target)
 167
 168 class Generate (BaseGenFile):
 169   """
 170   Generate TARGET by running the SOURCE Python script.
 171
 172   If SOURCE is omitted, replace the extension of TARGET by `.py'.
 173   """
 174   def __init__(me, target, source = None):
 175     if source is None: source = OS.path.splitext(target)[0] + '.py'
 176     BaseGenFile.__init__(me, target, [source])
 177   def _gen(me):
 178     temp = me.target + '.new'
 179     with open(temp, 'w') as ft:
 180       rc = SUB.call([SYS.executable, me.sources[0]], stdout = ft)
 181     if rc != 0: raise SubprocessFailure(me.sources[0], rc << 8)
 182     OS.rename(temp, me.target)
 183
 184 ## Backward compatibility.
 185 def derive(target, source, substmap): Derive(target, source, substmap).gen()
 186 def generate(target, source = None): Generate(target, source).gen()
 187
 188 ###--------------------------------------------------------------------------
 189 ### Discovering version numbers.
 190
 191 def auto_version(writep = True):
 192   """
 193   Returns the package version number.
 194
 195   As a side-effect, if WRITEP is true, then write the version number to the
 196   RELEASE file so that it gets included in distributions.
 197
 198   All of this is for backwards compatibility.  New projects should omit the
 199   `version' keyword entirely and let `setup' discover it and write it into
 200   tarballs automatically.
 201   """
 202   version = progoutput(['./auto-version'])
 203   if writep:
 204     with open('RELEASE.new', 'w') as ft: ft.write('%s\n' % version)
 205     OS.rename('RELEASE.new', 'RELEASE')
 206   return version
 207
 208 ###--------------------------------------------------------------------------
 209 ### Adding new commands.
 210
 211 CMDS = {}
 212
 213 class CommandClass (type):
 214   """
 215   Metaclass for command classes: automatically adds them to the `CMDS' map.
 216   """
 217   def __new__(cls, name, supers, dict):
 218     c = super(CommandClass, cls).__new__(cls, name, supers, dict)
 219     try: name = c.NAME
 220     except AttributeError: pass
 221     else: CMDS[name] = c
 222     return c
 223
 224 class Command (DC.Command, object):
 225   """
 226   Base class for `mdwsetup' command classes.
 227
 228   This provides the automatic registration machinery, via the metaclass, and
 229   also trivial implementations of various responsibilities of `DC.Command'
 230   methods and attributes.
 231   """
 232   __metaclass__ = CommandClass
 233   user_options = []
 234   def initialize_options(me): pass
 235   def finalize_options(me): pass
 236   def run_subs(me):
 237     for s in me.get_sub_commands(): me.run_command(s)
 238
 239 ###--------------------------------------------------------------------------
 240 ### Some handy new commands.
 241
 242 class distdir (Command):
 243   NAME = 'distdir'
 244   description = "print the distribution directory name to stdout"
 245   def run(me):
 246     d = me.distribution
 247     print '%s-%s' % (d.get_name(), d.get_version())
 248
 249 class build_gen(Command):
 250   """
 251   Generate files, according to the `genfiles'.
 252
 253   The `genfiles' keyword argument to `setup' lists a number of objects which
 254   guide the generation of output files.  These objects must implement the
 255   following methods.
 256
 257   clean(DRY_RUN_P)      Remove the output files.
 258
 259   gen(DRY_RUN_P)        Generate the output files, if they don't exist or are
 260                         out of date with respect to their prerequisites.
 261
 262   If DRY_RUN_P is true then the methods must not actually do anything with a
 263   lasting effect, but should print progress messages as usual.
 264   """
 265   NAME = 'build_gen'
 266   description = "build generated source files"
 267   def run(me):
 268     d = me.distribution
 269     for g in d.genfiles: g.gen(dry_run_p = me.dry_run)
 270
 271 from distutils.command.build import build as _build
 272 class build (_build, Command):
 273   ## Add `build_gen' early in the list of subcommands.
 274   NAME = 'build'
 275   sub_commands = [('build_gen', lambda me: me.distribution.genfiles)]
 276   sub_commands += _build.sub_commands
 277
 278 class clean_gen(Command):
 279   """
 280   Remove the generated files, as listed in `genfiles'.
 281
 282   See the `build_gen' command for more detailed information.
 283   """
 284   NAME = 'clean_gen'
 285   description = "clean generated source files"
 286   def run(me):
 287     d = me.distribution
 288     for g in d.genfiles: g.clean(dry_run_p = me.dry_run)
 289
 290 class clean_others(Command):
 291   """
 292   Remove the files listed in the `cleanfiles' argument to `setup'.
 293   """
 294   NAME = 'clean_others'
 295   description = "clean miscellaneous output files"
 296   def run(me):
 297     d = me.distribution
 298     for f in d.cleanfiles:
 299       if not OS.path.exists(f): continue
 300       DL.log(DL.INFO, "delete `%s'", f)
 301       if not me.dry_run: OS.remove(f)
 302
 303 from distutils.command.clean import clean as _clean
 304 class clean (_clean, Command):
 305   ## Add `clean_gen' and `clean_others' to the list of subcommands.
 306   NAME = 'clean'
 307   sub_commands = [('clean_gen', lambda me: me.distribution.genfiles),
 308                   ('clean_others', lambda me: me.distribution.cleanfiles)]
 309   sub_commands += _clean.sub_commands
 310   def run(me):
 311     me.run_subs()
 312     _clean.run(me)
 313
 314 from distutils.command.sdist import sdist as _sdist
 315 class sdist (_sdist, Command):
 316   ## Write a `RELEASE' file to the output, if we extracted the version number
 317   ## from version control.  Also arrange to dereference symbolic links while
 318   ## copying.  Symlinks to directories will go horribly wrong, so don't do
 319   ## that.
 320   NAME = 'sdist'
 321   def make_release_tree(me, base_dir, files):
 322     _sdist.make_release_tree(me, base_dir, files)
 323     d = me.distribution
 324     if d._auto_version_p:
 325       v = d.metadata.get_version()
 326       DL.log(DL.INFO, "write `RELEASE' file: %s" % v)
 327       with open(OS.path.join(base_dir, 'RELEASE'), 'w') as f:
 328         f.write('%s\n' % v)
 329   def copy_file(me, infile, outfile, link = None, *args, **kw):
 330     if OS.path.islink(infile): link = None
 331     return _sdist.copy_file(me, infile, outfile, link = link, *args, **kw)
 332
 333 ###--------------------------------------------------------------------------
 334 ### Our own version of `setup'.
 335
 336 class Dist (DC.Distribution):
 337   ## Like the usual version, but with some additional attributes to support
 338   ## our enhanced commands.
 339   def __init__(me, attrs = None):
 340     me.genfiles = []
 341     me.cleanfiles = []
 342     me._auto_version_p = False
 343     DC.Distribution.__init__(me, attrs)
 344     if me.metadata.version is None:
 345       me.metadata.version = auto_version(writep = False)
 346       me._auto_version_p = True
 347     me.cleanfiles = set(me.cleanfiles)
 348     me.cleanfiles.add('MANIFEST')
 349
 350 def setup(cmdclass = {}, distclass = Dist, **kw):
 351   ## Like the usual version, but provides defaults more suited to our
 352   ## purposes.
 353   cmds = dict()
 354   cmds.update(CMDS)
 355   cmds.update(cmdclass)
 356   DC.setup(cmdclass = cmds, distclass = distclass, **kw)
 357
 358 ###----- That's all, folks --------------------------------------------------