Grant Limberg
parent
ff8da9d246
commit
c07e4a8c01
333 changed files with 0 additions and 95037 deletions
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#! /usr/bin/env python3
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"""Minimal macro processor. Used for generating VC++ makefiles.
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The available template commands are:
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Expand a template section for each file in a list of file patterns::
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###MAKTEMPLATE:FOREACH my/path*/*.cxx,other*.cxx
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...
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###MAKTEMPLATE:ENDFOREACH
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In the template section, you can use `###BASENAME###` to get the base name
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of the file being processed (e.g. "base" for "../base.cxx"), and you can
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use `###FILENAME###` to get the full filename.
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Copyright (c) 2000-2022, Bart Samwel and Jeroen T. Vermeulen.
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"""
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from __future__ import (
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absolute_import,
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print_function,
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unicode_literals,
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)
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from argparse import (
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ArgumentError,
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ArgumentParser,
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RawDescriptionHelpFormatter,
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)
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from contextlib import contextmanager
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from glob import glob
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import os
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from sys import (
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argv,
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stdin,
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stderr,
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stdout,
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)
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import sys
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from textwrap import dedent
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def expand_foreach_file(path, block, outfile):
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"""Expand a "foreach" block for a single file path.
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Write the results to outfile.
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"""
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basepath, _ = os.path.splitext(os.path.basename(path))
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for line in block:
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line = line.replace("###FILENAME###", path)
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line = line.replace("###BASENAME###", basepath)
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outfile.write(line)
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def match_globs(globs):
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"""List all files matching any item in globs.
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Eliminates duplicates.
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"""
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return sorted({
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path
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for pattern in globs
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for path in glob(pattern)
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})
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def expand_foreach(globs, block, outfile):
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"""Expand a foreach block for each file matching one of globs.
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Write the results to outfile.
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"""
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# We'll be iterating over block a variable number of times. Turn it
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# from a generic iterable into an immutable array.
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block = tuple(block)
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for path in match_globs(globs):
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expand_foreach_file(path, block, outfile)
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# Header to be prefixed to the generated file.
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OUTPUT_HEADER = dedent("""\
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# AUTOMATICALLY GENERATED FILE -- DO NOT EDIT.
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#
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# This file is generated automatically by libpqxx's {script} script, and
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# will be rewritten from time to time.
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#
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# If you modify this file, chances are your modifications will be lost.
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#
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# The {script} script should be available in the tools directory of the
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# libpqxx source archive.
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""")
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foreach_marker = r"###MAKTEMPLATE:FOREACH "
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end_foreach_marker = r"###MAKTEMPLATE:ENDFOREACH"
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def parse_foreach(line):
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"""Parse FOREACH directive, if line contains one.
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:param line: One line of template input.
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:return: A list of FOREACH globs, or None if this was not a FOREACH line.
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"""
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line = line.strip()
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if line.startswith(foreach_marker):
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return line[len(foreach_marker):].split(',')
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else:
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return None
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def read_foreach_block(infile):
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"""Read a FOREACH block from infile (not including the FOREACH directive).
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Assumes that the FOREACH directive was in the preceding line. Consumes
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the line with the ENDFOREACH directive, but does not yield it.
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:return: Iterable of lines.
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"""
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for line in infile:
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if line.strip().startswith(end_foreach_marker):
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return
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yield line
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def expand_template(infile, outfile):
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"""Expand the template in infile, and write the results to outfile."""
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for line in infile:
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globs = parse_foreach(line)
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if globs is None:
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# Not a FOREACH line. Copy to output.
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outfile.write(line)
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else:
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block = read_foreach_block(infile)
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expand_foreach(globs, block, outfile)
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@contextmanager
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def open_stream(path=None, default=None, mode='r'):
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"""Open file at given path, or yield default. Close as appropriate.
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The default should be a stream, not a path; closing the context will not
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close it.
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"""
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if path is None:
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yield default
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else:
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with open(path, mode) as stream:
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yield stream
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def parse_args():
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"""Parse command-line arguments.
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:return: Tuple of: input path (or None for stdin), output path (or None
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for stdout).
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"""
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parser = ArgumentParser(
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description=__doc__, formatter_class=RawDescriptionHelpFormatter)
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parser.add_argument(
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'template', nargs='?',
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help="Input template. Defaults to standard input.")
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parser.add_argument(
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'output', nargs='?',
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help="Output file. Defaults to standard output.")
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args = parser.parse_args()
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return args.template, args.output
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def write_header(stream, template_path=None):
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"""Write header to stream."""
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hr = ('# ' + '#' * 78) + "\n"
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script = os.path.basename(argv[0])
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outstream.write(hr)
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outstream.write(OUTPUT_HEADER.format(script=script))
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if template_path is not None:
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outstream.write("#\n")
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outstream.write("# Generated from template '%s'.\n" % template_path)
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outstream.write(hr)
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if __name__ == '__main__':
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try:
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template_path, output_path = parse_args()
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except ArgumentError as error:
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stderr.write('%s\n' % error)
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sys.exit(2)
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input_stream = open_stream(template_path, stdin, 'r')
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output_stream = open_stream(output_path, stdout, 'w')
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with input_stream as instream, output_stream as outstream:
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write_header(outstream, template_path)
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expand_template(instream, outstream)
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