--- /dev/null
+### -*-python-*-
+###
+### Utility module for Python build systems
+###
+### (c) 2009 Straylight/Edgeware
+###
+
+###----- Licensing notice ---------------------------------------------------
+###
+### This file is part of the Python interface to mLib.
+###
+### mLib/Python is free software; you can redistribute it and/or modify
+### it under the terms of the GNU General Public License as published by
+### the Free Software Foundation; either version 2 of the License, or
+### (at your option) any later version.
+###
+### mLib/Python is distributed in the hope that it will be useful,
+### but WITHOUT ANY WARRANTY; without even the implied warranty of
+### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+### GNU General Public License for more details.
+###
+### You should have received a copy of the GNU General Public License
+### along with mLib/Python; if not, write to the Free Software Foundation,
+### Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+import sys as SYS
+import os as OS
+import re as RE
+import subprocess as SUB
+
+import distutils.core as DC
+
+###--------------------------------------------------------------------------
+### Random utilities.
+
+def uniquify(seq):
+ """
+ Return a list of the elements of SEQ, with duplicates removed.
+
+ Only the first occurrence (according to `==') is left.
+ """
+ seen = {}
+ out = []
+ for item in seq:
+ if item not in seen:
+ seen[item] = True
+ out.append(item)
+ return out
+
+###--------------------------------------------------------------------------
+### Subprocess hacking.
+
+class SubprocessFailure (Exception):
+ def __init__(me, file, rc):
+ me.args = (file, rc)
+ me.file = file
+ me.rc = rc
+ def __str__(me):
+ if WIFEXITED(me.rc):
+ return '%s failed (rc = %d)' % (me.file, WEXITSTATUS(me.rc))
+ elif WIFSIGNALED(me.rc):
+ return '%s died (signal %d)' % (me.file, WTERMSIG(me.rc))
+ else:
+ return '%s died inexplicably' % (me.file)
+
+def progoutput(command):
+ """
+ Run the shell COMMAND and return its standard output.
+
+ The COMMAND must produce exactly one line of output, and must exit with
+ status zero.
+ """
+ kid = SUB.Popen(command, stdout = SUB.PIPE)
+ out = kid.stdout.readline()
+ junk = kid.stdout.read()
+ if junk != '':
+ raise ValueError, \
+ "Child process `%s' produced unspected output %r" % (command, junk)
+ rc = kid.wait()
+ if rc != 0:
+ raise SubprocessFailure, (command, rc)
+ return out.rstrip('\n')
+
+###--------------------------------------------------------------------------
+### External library packages.
+
+INCLUDEDIRS = []
+LIBDIRS = []
+LIBS = []
+
+def pkg_config(pkg, version):
+ """
+ Find the external package PKG and store the necessary compiler flags.
+
+ The include-directory names are stored in INCLUDEDIRS; the
+ library-directory names are in LIBDIRS; and the library names themselves
+ are in LIBS.
+ """
+ spec = '%s >= %s' % (pkg, version)
+ def weird(what, word):
+ raise ValueError, \
+ "Unexpected `%s' item `%s' from package `%s'" % (what, word, pkg)
+ for word in progoutput(['pkg-config', '--cflags', spec]).split():
+ if word.startswith('-I'):
+ INCLUDEDIRS.append(word[2:])
+ else:
+ weird('--cflags', word)
+ for word in progoutput(['pkg-config', '--libs', spec]).split():
+ if word.startswith('-L'):
+ LIBDIRS.append(word[2:])
+ elif word.startswith('-l'):
+ LIBS.append(word[2:])
+ else:
+ weird('--libs', word)
+
+###--------------------------------------------------------------------------
+### Substituting variables in files.
+
+def needs_update_p(target, sources):
+ """
+ Returns whether TARGET is out of date relative to its SOURCES.
+
+ If TARGET exists and was modified more recentently than any of its SOURCES
+ then it doesn't need updating.
+ """
+ if not OS.path.exists(target):
+ return True
+ t_target = OS.stat(target).st_mtime
+ for source in sources:
+ if OS.stat(source).st_mtime >= t_target:
+ return True
+ return False
+
+RX_SUBST = RE.compile(r'\%(\w+)\%')
+def derive(target, source, substmap):
+ """
+ Derive TARGET from SOURCE by making simple substitutions.
+
+ The SOURCE may contain markers %FOO%; these are replaced by SUBSTMAP['FOO']
+ in the TARGET file.
+ """
+ if not needs_update_p(target, [source]):
+ return False
+ print "making `%s' from `%s'" % (target, source)
+ temp = target + '.new'
+ ft = open(temp, 'w')
+ try:
+ fs = open(source, 'r')
+ try:
+ for line in fs:
+ ft.write(RX_SUBST.sub((lambda m: substmap[m.group(1)]), line))
+ finally:
+ fs.close()
+ finally:
+ ft.close()
+ OS.rename(temp, target)
+
+def generate(target, source = None):
+ """
+ Generate TARGET by running the SOURCE Python script.
+
+ If SOURCE is omitted, replace the extension of TARGET by `.py'.
+ """
+ if source is None:
+ source = OS.path.splitext(target)[0] + '.py'
+ if not needs_update_p(target, [source]):
+ return
+ print "making `%s' using `%s'" % (target, source)
+ temp = target + '.new'
+ ft = open(temp, 'w')
+ try:
+ rc = SUB.call([SYS.executable, source], stdout = ft)
+ finally:
+ ft.close()
+ if rc != 0:
+ raise SubprocessFailure, (source, rc)
+ OS.rename(temp, target)
+
+###--------------------------------------------------------------------------
+### Discovering version numbers.
+
+def auto_version(writep = True):
+ """
+ Returns the package version number.
+
+ As a side-effect, if WRITEP is true, then write the version number to the
+ RELEASE file so that it gets included in distributions.
+ """
+ version = progoutput(['./auto-version'])
+ if writep:
+ ft = open('RELEASE.new', 'w')
+ try:
+ ft.write('%s\n' % version)
+ finally:
+ ft.close()
+ OS.rename('RELEASE.new', 'RELEASE')
+ return version
+
+###----- That's all, folks --------------------------------------------------
~mdw / cfd / commitdiff