#!/usr/bin/env python
# -*- coding: iso-8859-1 -*-

# file fig_copy.py
# This file is part of LyX, the document processor.
# Licence details can be found in the file COPYING.
#
# \author Angus Leeming
# \author Bo Peng
#
# Full author contact details are available in file CREDITS

# Usage:
# fig_copy.py <from file> <to file>

# This script will copy an XFIG .fig file "$1" to "$2". In the process,
# it will modify the contents of the .fig file so that the names of any
# picture files that are stored as relative paths are replaced
# with the absolute path.

import os, sys

# compatibility with python 2.2
if sys.version_info[:3] == (2, 2, 0):
    __builtin__.True = (1 == 1)
    __builtin__.False = (1 == 0)
    def bool(value):
        """Demote a value to 0 or 1, depending on its truth value

        This is not to be confused with types.BooleanType, which is
        way too hard to duplicate in 2.1 to be worth the trouble.
        """
        return not not value
    __builtin__.bool = bool
    del bool
# end compatibility chunk

if len(sys.argv) != 3:
    print >> sys.stderr, "Usage: fig_copy.py <from file> <to file>"
    sys.exit(1)

if not os.path.isfile(sys.argv[1]):
    print >> sys.stderr, "Unable to read", sys.argv[1]
    sys.exit(1)

from_dir = os.path.split(os.path.realpath(sys.argv[1]))[0]
to_dir = os.path.split(os.path.realpath(sys.argv[2]))[0]

# The work is trivial if "to" and "from" are in the same directory.
if from_dir == to_dir:
    import shutil
    try:
        shutil.copy(sys.argv[1], sys.argv[2])
    except:
        sys.exit(1)
    sys.exit(0)

# Ok, they're in different directories. The .fig file must be modified.
import re

# We're looking for a line of text that defines an entry of
# type '2' (a polyline), subtype '5' (an external picture file).
# The line has 14 other data fields.
patternline = re.compile(r'^\s*2\s+5(\s+[0-9.+-]+){14}\s*$')
emptyline   = re.compile(r'^\s*$')
commentline = re.compile(r'^\s*#.*$')
# we allow space in path name
figureline  = re.compile(r'^(\s*[01]\s*)(\S[\S ]*)(\s*)$')

input = open(sys.argv[1], 'r')
output = open(sys.argv[2], 'w')

# path in the fig is relative to this path
os.chdir(from_dir)

found = False
for line in input.xreadlines():
    if found and not emptyline.match(line) and not commentline.match(line):
        # The contents of the final line containing the file name
        # are ' X <file name>', where X = 0 or 1.
        # We extract filename and replace it with the absolute filename.
        (pre, path, post) = figureline.match(line).groups()
        line = pre + os.path.realpath(path) + post
        found = False
    elif patternline.match(line):
        found = True
    print >> output, line,

input.close()
output.close()