#! /usr/bin/env python
# -*- coding: iso-8859-1 -*-
# Copyright (C) 2002-2004 José Matos <jamatos@lyx.org>
#
# This program 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.
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

import getopt
import gzip
import sys
import os.path
from parser_tools import read_file, write_file, read_version, set_version, \
     read_format, set_format, chain, lyxformat, get_value

# Allow the dummy object to be able to carry related data
# like a C struct
class struct:
    def __init__(self):
        self.output = sys.stdout
        self.input = sys.stdin
        self.err = sys.stderr
        self.debug = 1
        self.dir = ""
        self.start = None
        self.end = None

    def warning(self, message, debug_level= 1):
        if debug_level <= self.debug:
            self.err.write(message + "\n")

    def error(self, message):
        self.warning(message)
        self.warning("Quiting.")
        sys.exit(1)

def usage():
    print """Usage: lyx2lyx [options] [file]
Convert old lyx file <file> to newer format, files can be compressed with gzip.
If there no file is specified then the standard input is assumed, in this case
gziped files are not handled.
Options:
    -h, --help			this information
    -v, --version		output version information and exit
    -l, --list			list all available formats
    -d, --debug level		level=0..2 (O_ no debug information, 2_verbose)
				default: level=1
    -e, --err error_file	name of the error file or else goes to stderr
    -f, --from version		initial version (optional)
    -t, --to version		final version (optional)
    -o, --output name		name of the output file or else goes to stdout
    -q, --quiet			same as --debug=0"""


def parse_options(argv, version, opt):
    _options =  ["help", "version", "list", "debug=", "err=", "from=", "to=", "output=", "quiet"]
    try:
       opts, args = getopt.getopt(argv[1:], "d:e:f:hlo:qt:v", _options)
    except getopt.error:
        usage()
        sys.exit(2)

    for o, a in opts:
        if o in ("-h", "--help"):
            usage()
            sys.exit()
        if o in ("-v", "--version"):
            print "lyx2lyx, version %s" %(version)
            print "Copyright (C) 2002-2004 José Matos and Dekel Tsur"
            sys.exit()
        if o in ("-d", "--debug"):
            opt.debug = int(a)
        if o in ("-q", "--quiet"):
            opt.debug = 0
        if o in ("-l", "--list"):
            # list available formats
            sys.exit()
        if o in ("-o", "--output"):
            opt.output = open(a, "w")
        if o in ("-f", "--from"):
            opt.start = lyxformat(a, opt)
        if o in ("-t", "--to"):
            opt.end = lyxformat(a, opt)
        if o in ("-e","--err"):
            opt.err = open(a, "w")

    if args:
        file = args[0]
        opt.dir = os.path.dirname(os.path.abspath(file))
        try:
            gzip.open(file).readline()
            opt.output = gzip.GzipFile("","wb",6,opt.output)
            opt.input = gzip.open(file)
        except:
            opt.input = open(file)

def main(argv):
    version = "1.4.0cvs"

    # options object, with default values
    opt = struct()
    
    parse_options(argv, version, opt)

    header, body = [], []

    read_file(header, body, opt)

    initial_version = read_version(header)
    opt.format  = read_format(header, opt)
    opt.language = get_value(header, "\\language", 0)
    if opt.language == "":
	opt.language = "english"

    mode, convertion_chain = chain(opt, initial_version)
    opt.warning("convertion chain: " + str(convertion_chain), 3)

    for step in convertion_chain:
        convert = getattr(__import__("lyx_" + step), mode)
        convert(header,body, opt)

    set_version(header, version)
    set_format(header, opt.format)
    write_file(header, body, opt)

if __name__ == "__main__":
    main(sys.argv)