#! /usr/bin/env python
# -*- coding: utf-8 -*-

# file lyxpak.py
# This file is part of LyX, the document processor.
# Licence details can be found in the file COPYING.

# author Enrico Forestieri
# author Richard Heck

# Full author contact details are available in file CREDITS

# This script creates a tar or zip archive with a lyx file and all included
# files (graphics and so on). By default, the created archive is the standard
# type on a given platform, such that a zip archive is created on Windows and
# a gzip compressed tar archive on *nix. This can be controlled by command
# line options, however.

import os, re, string, sys
if sys.version_info < (2, 4, 0):
    from sets import Set as set
from getopt import getopt

# Pre-compiled regular expressions.
re_lyxfile = re.compile("\.lyx$")
re_input = re.compile(r'^(.*)\\(input|include){(\s*)(.+)(\s*)}.*$')
re_ertinput = re.compile(r'^(input|include)({)(\s*)(.+)(\s*)}.*$')
re_package = re.compile(r'^(.*)\\(usepackage){(\s*)(.+)(\s*)}.*$')
re_class = re.compile(r'^(\\)(textclass)(\s+)(.+)\s*$')
re_norecur = re.compile(r'^(.*)\\(verbatiminput|lstinputlisting|includegraphics\[*.*\]*){(\s*)(.+)(\s*)}.*$')
re_ertnorecur = re.compile(r'^(verbatiminput|lstinputlisting|includegraphics\[*.*\]*)({)(\s*)(.+)(\s*)}.*$')
re_filename = re.compile(r'^(\s*)(filename)(\s+)(.+)\s*$')
re_options = re.compile(r'^(\s*)options(\s+)(.+)\s*$')
re_bibfiles = re.compile(r'^(\s*)bibfiles(\s+)(.+)\s*$')


def usage(prog_name):
    msg = '''
Usage: %s [-t] [-z] [-l path] [-o output_dir] file.lyx
Options:
-l: Path to lyx2lyx script
-o: Directory for output
-t: Create gzipped tar file
-z: Create zip file
By default, we create file.zip on Windows and file.tar.gz on *nix,
with the file output to where file.lyx is, and we look for lyx2lyx
in the known locations, querying LyX itself if necessary.
'''
    return msg % prog_name


def error(message):
    sys.stderr.write(message + '\n')
    sys.exit(1)


def run_cmd(cmd):
    handle = os.popen(cmd, 'r')
    cmd_stdout = handle.read()
    cmd_status = handle.close()
    return cmd_status, cmd_stdout


def find_exe(candidates, extlist, path):
    for prog in candidates:
        for directory in path:
            for ext in extlist:
                full_path = os.path.join(directory, prog + ext)
                if os.access(full_path, os.X_OK):
                    return prog, full_path
    return None, None


def abspath(name):
    " Resolve symlinks and returns the absolute normalized name."
    newname = os.path.normpath(os.path.abspath(name))
    if os.name != 'nt':
        newname = os.path.realpath(newname)
    return newname


def gather_files(curfile, incfiles, lyx2lyx):
    " Recursively gather files."
    curdir = os.path.dirname(abspath(curfile))
    is_lyxfile = re_lyxfile.search(curfile)
    if is_lyxfile:
        lyx2lyx_cmd = 'python "%s" "%s"' % (lyx2lyx, curfile)
        l2l_status, l2l_stdout = run_cmd(lyx2lyx_cmd)
        if l2l_status != None:
            error('%s failed to convert "%s"' % (lyx2lyx, curfile))
        lines = l2l_stdout.splitlines()
    else:
        input = open(curfile, 'rU')
        lines = input.readlines()
        input.close()

    maybe_in_ert = False
    i = 0
    while i < len(lines):
        # Gather used files.
        recursive = True
        extlist = ['']
        match = re_filename.match(lines[i])
        if not match:
            if maybe_in_ert:
                match = re_ertinput.match(lines[i])
            else:
                match = re_input.match(lines[i])
            if not match:
                match = re_package.match(lines[i])
                extlist = ['.sty']
                if not match:
                    match = re_class.match(lines[i])
                    extlist = ['.cls']
                    if not match:
                        if maybe_in_ert:
                            match = re_ertnorecur.match(lines[i])
                        else:
                            match = re_norecur.match(lines[i])
                        extlist = ['', '.eps', '.pdf', '.png', '.jpg']
                        recursive = False
        maybe_in_ert = is_lyxfile and lines[i] == "\\backslash"
        if match:
            file = match.group(4).strip('"')
            if not os.path.isabs(file):
                file = os.path.join(curdir, file)
            file_exists = False
            if not os.path.isdir(file):
                for ext in extlist:
                    if os.path.exists(file + ext):
                        file = file + ext
                        file_exists = True
                        break
            if file_exists and not abspath(file) in incfiles:
                incfiles.append(abspath(file))
                if recursive:
                    gather_files(file, incfiles, lyx2lyx)
            i += 1
            continue

        if not is_lyxfile:
            i += 1
            continue

        # Gather bibtex *.bst files.
        match = re_options.match(lines[i])
        if match:
            file = match.group(3).strip('"')
            if not os.path.isabs(file):
                file = os.path.join(curdir, file + '.bst')
            if os.path.exists(file):
                incfiles.append(abspath(file))
            i += 1
            continue

        # Gather bibtex *.bib files.
        match = re_bibfiles.match(lines[i])
        if match:
            bibfiles = match.group(3).strip('"').split(',')
            j = 0
            while j < len(bibfiles):
                if os.path.isabs(bibfiles[j]):
                    file = bibfiles[j] + '.bib'
                else:
                    file = os.path.join(curdir, bibfiles[j] + '.bib')
                if os.path.exists(file):
                    incfiles.append(abspath(file))
                j += 1
            i += 1
            continue

        i += 1

    return 0


def find_lyx2lyx(progloc, path):
    " Find a usable version of the lyx2lyx script. "
    # first we will see if the script is roughly where we are
    # i.e., we will assume we are in $SOMEDIR/scripts and look
    # for $SOMEDIR/lyx2lyx/lyx2lyx.
    ourpath = os.path.dirname(abspath(progloc))
    (upone, discard) = os.path.split(ourpath)
    tryit = os.path.join(upone, "lyx2lyx", "lyx2lyx")
    if os.access(tryit, os.X_OK):
        return tryit

    # now we will try to query LyX itself to find the path.
    extlist = ['']
    if "PATHEXT" in os.environ:
        extlist = extlist + os.environ["PATHEXT"].split(os.pathsep)
    lyx_exe, full_path = find_exe(["lyxc", "lyx"], extlist, path)
    if lyx_exe == None:
        error('Cannot find the LyX executable in the path.')
    cmd_status, cmd_stdout = run_cmd("%s -version 2>&1" % lyx_exe)
    if cmd_status != None:
        error('Cannot query LyX about the lyx2lyx script.')
    re_msvc = re.compile(r'^(\s*)(Host type:)(\s+)(win32)$')
    re_sysdir = re.compile(r'^(\s*)(LyX files dir:)(\s+)(\S+)$')
    lines = cmd_stdout.splitlines()
    for line in lines:
        match = re_msvc.match(line)
        if match:
            # The LyX executable was built with MSVC, so the
            # "LyX files dir:" line is unusable
            basedir = os.path.dirname(os.path.dirname(full_path))
            tryit = os.path.join(basedir, 'Resources', 'lyx2lyx', 'lyx2lyx')
            break
        match = re_sysdir.match(line)
        if match:
            tryit = os.path.join(match.group(4), 'lyx2lyx', 'lyx2lyx')
            break

    if not os.access(tryit, os.X_OK):
        error('Unable to find the lyx2lyx script.')
    return tryit


def main(args):

    ourprog = args[0]

    try:
      (options, argv) = getopt(args[1:], "htzl:o:")
    except:
      error(usage(ourprog))

    # we expect the filename to be left
    if len(argv) != 1:
        error(usage(ourprog))

    makezip = (os.name == 'nt')
    outdir = ""
    lyx2lyx = None

    for (opt, param) in options:
      if opt == "-h":
        print usage(ourprog)
        sys.exit(0)
      elif opt == "-t":
        makezip = False
      elif opt == "-z":
        makezip = True
      elif opt == "-l":
        lyx2lyx = param
      elif opt == "-o":
        outdir = param
        if not os.path.isdir(outdir):
          error('Error: "%s" is not a directory.' % outdir)

    lyxfile = argv[0]
    if not os.path.exists(lyxfile):
        error('File "%s" not found.' % lyxfile)

    # Check that it actually is a LyX document
    input = open(lyxfile, 'rU')
    line = input.readline()
    input.close()
    if not (line and line.startswith('#LyX')):
        error('File "%s" is not a LyX document.' % lyxfile)

    if makezip:
        import zipfile
    else:
        import tarfile

    ar_ext = ".tar.gz"
    if makezip:
        ar_ext = ".zip"

    ar_name = re_lyxfile.sub(ar_ext, abspath(lyxfile))
    if outdir:
        ar_name = os.path.join(abspath(outdir), os.path.basename(ar_name))

    path = string.split(os.environ["PATH"], os.pathsep)

    if lyx2lyx == None:
        lyx2lyx = find_lyx2lyx(ourprog, path)

    # Initialize the list with the specified LyX file and recursively
    # gather all required files (also from child documents).
    incfiles = [abspath(lyxfile)]
    gather_files(lyxfile, incfiles, lyx2lyx)

    # Find the topmost dir common to all files
    if len(incfiles) > 1:
        topdir = os.path.commonprefix(incfiles)
        # Check whether topdir is valid, as os.path.commonprefix() works on
        # a character by character basis, rather than on path elements.
        if not os.path.exists(topdir):
            topdir = os.path.dirname(topdir) + os.path.sep
    else:
        topdir = os.path.dirname(incfiles[0]) + os.path.sep

    # Remove the prefix common to all paths in the list
    i = 0
    while i < len(incfiles):
        incfiles[i] = string.replace(incfiles[i], topdir, '', 1)
        i += 1

    # Remove duplicates and sort the list
    incfiles = list(set(incfiles))
    incfiles.sort()

    if topdir != '':
        os.chdir(topdir)

    # Create the archive
    try:
        if makezip:
            zip = zipfile.ZipFile(ar_name, "w", zipfile.ZIP_DEFLATED)
            for file in incfiles:
                zip.write(file)
            zip.close()
        else:
            tar = tarfile.open(ar_name, "w:gz")
            for file in incfiles:
                tar.add(file)
            tar.close()
    except:
        error('Failed to create LyX archive "%s"' % ar_name)

    print 'LyX archive "%s" created successfully.' % ar_name
    return 0


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