cmd.py 文件源码

def make_file(self, infiles, outfile, func, args,
                  exec_msg=None, skip_msg=None, level=1):
        """Special case of 'execute()' for operations that process one or
        more input files and generate one output file.  Works just like
        'execute()', except the operation is skipped and a different
        message printed if 'outfile' already exists and is newer than all
        files listed in 'infiles'.  If the command defined 'self.force',
        and it is true, then the command is unconditionally run -- does no
        timestamp checks.
        """
        if skip_msg is None:
            skip_msg = "skipping %s (inputs unchanged)" % outfile

        # Allow 'infiles' to be a single string
        if isinstance(infiles, str):
            infiles = (infiles,)
        elif not isinstance(infiles, (list, tuple)):
            raise TypeError, \
                  "'infiles' must be a string, or a list or tuple of strings"

        if exec_msg is None:
            exec_msg = "generating %s from %s" % \
                       (outfile, ', '.join(infiles))

        # If 'outfile' must be regenerated (either because it doesn't
        # exist, is out-of-date, or the 'force' flag is true) then
        # perform the action that presumably regenerates it
        if self.force or dep_util.newer_group(infiles, outfile):
            self.execute(func, args, exec_msg, level)

        # Otherwise, print the "skip" message
        else:
            log.debug(skip_msg)

# XXX 'install_misc' class not currently used -- it was the base class for
# both 'install_scripts' and 'install_data', but they outgrew it.  It might
# still be useful for 'install_headers', though, so I'm keeping it around
# for the time being.