"""distutils.command.build_scripts

Implements the Distutils 'build_scripts' command."""

# This module should be kept compatible with Python 2.1.

__revision__ = "$Id: build_scripts.py 61000 2008-02-23 17:40:11Z christian.heimes $"

import os, re

from stat import ST_MODE

from distutils import sysconfig

from distutils.core import Command

from distutils.dep_util import newer

from distutils.util import convert_path

from distutils import log

# check if Python is called on the first line with this expression

first_line_re = re.compile('^#!.*python[0-9.]*([ \t].*)?$')

class build_scripts (Command):

    description = "\"build\" scripts (copy and fixup #! line)"

    user_options = [

        ('build-dir=', 'd', "directory to \"build\" (copy) to"),

        ('force', 'f', "forcibly build everything (ignore file timestamps"),

        ('executable=', 'e', "specify final destination interpreter path"),

        ]

    boolean_options = ['force']

    def initialize_options (self):

        self.build_dir = None

        self.scripts = None

        self.force = None

        self.executable = None

        self.outfiles = None

    def finalize_options (self):

        self.set_undefined_options('build',

                                   ('build_scripts', 'build_dir'),

                                   ('force', 'force'),

                                   ('executable', 'executable'))

        self.scripts = self.distribution.scripts

    def get_source_files(self):

        return self.scripts

    def run (self):

        if not self.scripts:

            return

        self.copy_scripts()

    def copy_scripts (self):

        """Copy each script listed in 'self.scripts'; if it's marked as a

        Python script in the Unix way (first line matches 'first_line_re',

        ie. starts with "\#!" and contains "python"), then adjust the first

        line to refer to the current Python interpreter as we copy.

        """

        self.mkpath(self.build_dir)

        outfiles = []

        for script in self.scripts:

            adjust = 0

            script = convert_path(script)

            outfile = os.path.join(self.build_dir, os.path.basename(script))

            outfiles.append(outfile)

            if not self.force and not newer(script, outfile):

                log.debug("not copying %s (up-to-date)", script)

                continue

            # Always open the file, but ignore failures in dry-run mode --

            # that way, we'll get accurate feedback if we can read the

            # script.

            try:

                f = open(script, "r")

            except IOError:

                if not self.dry_run:

                    raise

                f = None

            else:

                first_line = f.readline()

                if not first_line:

                    self.warn("%s is an empty file (skipping)" % script)

                    continue

                match = first_line_re.match(first_line)

                if match:

                    adjust = 1

                    post_interp = match.group(1) or ''

            if adjust:

                log.info("copying and adjusting %s -> %s", script,

                         self.build_dir)

                if not self.dry_run:

                    outf = open(outfile, "w")

                    if not sysconfig.python_build:

                        outf.write("#!%s%s\n" %

                                   (self.executable,

                                    post_interp))

                    else:

                        outf.write("#!%s%s\n" %

                                   (os.path.join(

                            sysconfig.get_config_var("BINDIR"),

                            "python" + sysconfig.get_config_var("VERSION")

                                     + sysconfig.get_config_var("EXE")),

                                    post_interp))

                    outf.writelines(f.readlines())

                    outf.close()

                if f:

                    f.close()

            else:

                if f:

                    f.close()

                self.copy_file(script, outfile)

        if os.name == 'posix':

            for file in outfiles:

                if self.dry_run:

                    log.info("changing mode of %s", file)

                else:

                    oldmode = os.stat(file)[ST_MODE] & 07777

                    newmode = (oldmode | 0555) & 07777

                    if newmode != oldmode:

                        log.info("changing mode of %s from %o to %o",

                                 file, oldmode, newmode)

                        os.chmod(file, newmode)

    # copy_scripts ()

# class build_scripts