#! /usr/bin/env python
# Copyright (C) 2002 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, sys, string, re
from error import error, warning
from parser_tools import set_comment, set_format, check_token
import gzip

version = "1.4.0cvs"

# Allow the dummy object to be able to carry related data
# like a C struct
class struct:
    pass

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

opt.output = sys.stdout
opt.input = sys.stdin
opt.start = None
opt.end = None
opt.quiet = 0

format = re.compile(r"(\d)[\.,]?(\d\d)")
fileformat = re.compile(r"\\lyxformat\s*(\S*)")
lst_ft = ["210", "215", "216", "217", "218", "220", "221", "223", "224", "225"]

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
    -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):
    _options =  ["help", "version", "list", "debug=", "from=", "to=", "output=", "quiet"]
    try:
       opts, args = getopt.getopt(argv[1:], "d: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 "lyxconvert, version %s" %(version)
            print "Copyright (C) 2002-2003 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"):
            print lst_ft
            sys.exit()
        if o in ("-o", "--output"):
            opt.output = open(a, "w")
        if o in ("-f", "--from"):
            opt.start = lyxformat(a)
        if o in ("-t", "--to"):
            opt.end = lyxformat(a)

    if not opt.end:
        opt.end = lst_ft[len(lst_ft)-1]

    if opt.start and opt.start == opt.end:
        sys.stderr.write(error.same_format)
        sys.exit()

    if opt.start > opt.end:
        sys.stderr.write(error.newer_format)
        sys.exit(1)

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

def lyxformat(fmt):
    result = format.match(fmt)
    if result:
        fmt = result.group(1)+result.group(2)
    else:
        sys.stderr.write(fmt + ": " + error.invalid_format)
        sys.exit(2)

    if fmt in lst_ft:
        return fmt

    x = int(fmt)
    if x < int(lst_ft[-1]) and x > int(lst_ft[-2]):
        sys.stderr.write("lyx2lyx: A development version file.\n")
        return lst_ft[-2]

    sys.stderr.write(fmt + ": " + error.format_not_supported)
    sys.exit(1)

def read_file(file, header, body):
    """Reads a file into the header and body parts"""
    fmt = None
    preamble = 0

    while 1:
        line = file.readline()
        if not line:
            sys.stderr.write(error.invalid_file)
            sys.exit(3)

        line = line[:-1]
        if check_token(line, '\\begin_preamble'):
            preamble = 1
        if check_token(line, '\\end_preamble'):
            preamble = 0

        if not preamble:
            line = string.strip(line)

        if not line and not preamble:
            break

        header.append(line)
        result = fileformat.match(line)
        if result:
            fmt = lyxformat(result.group(1))

    while 1:
        line = file.readline()
        if not line:
            break
        body.append(line[:-1])

    if not fmt:
        sys.stderr.write(error.invalid_file)
        sys.exit(3)
    return fmt

def write_file(file, header, body):
    for line in header:
        file.write(line+"\n")
    file.write("\n")
    for line in body:
        file.write(line+"\n")

def main(argv):
    parse_options(argv)

    header, body = [], []
    fmt =  read_file(opt.input, header, body)

    if opt.start:
        if opt.start != fmt:
            sys.stderr.write("%s: %s %s\n" % (warning.dont_match, opt.start, fmt))
    else:
        opt.start = fmt

    # Convertion chain
    start = lst_ft.index(opt.start)
    end = lst_ft.index(opt.end)

    for fmt in lst_ft[start:end]:
	__import__("lyxconvert_" + fmt).convert(header,body)

    set_comment(header, version)
    set_format(header, opt.end)
    write_file(opt.output, header, body)
    
if __name__ == "__main__":
    main(sys.argv)