# -*- coding: utf-8 -*-

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

# \author Herbert Voß
# \author Jean-Marc Lasgouttes
# \author Jürgen Spitzmüller
# \author Bo Peng

# Full author contact details are available in file CREDITS.

# all files		-> without option
# TeX class files	-> option cls
# TeX style files 	-> option sty
# bibtex style files 	-> option bst
# bibtex database files -> option bib
# biblatex bibstyles 	-> option bbx
# biblatex citestyles 	-> option cbx
#
# with the help
# of kpsewhich and creates a
# bstFiles.lst, clsFiles.lst, styFiles.lst, bibFiles.lst,
# bbxFiles.lst, cbxFiles.lst
# without any parameter all files are created.
#
# Herbert Voss <voss@perce.org>
#
# Updates from Jean-Marc Lasgouttes.
#
# bib, bbx and cbx support added by Juergen Spitzmueller (v0.4)
#
# translated to python by Bo Peng, so that the script only 
# relies on python and kpsewhich (no shell command is used).
# 

from __future__ import print_function
import os, sys, re

cls_stylefile = 'clsFiles.lst'
sty_stylefile = 'styFiles.lst'
bst_stylefile = 'bstFiles.lst'
bib_files = 'bibFiles.lst'
bbx_files = 'bbxFiles.lst'
cbx_files = 'cbxFiles.lst'

def cmdOutput(cmd):
    '''utility function: run a command and get its output as a string
        cmd: command to run
    '''
    fout = os.popen(cmd)
    output = fout.read()
    fout.close()
    return output

# processing command line options
if len(sys.argv) > 1:
    if sys.argv[1] in ['--help', '-help']:
        print('''Usage: TeXFiles.py [-version | cls | sty | bst | bib | bbx| cbx ]
            Default is without any Parameters,
            so that all files will be created''')
        sys.exit(0)
    else:
        types = sys.argv[1:]
        for type in types:
            if type not in ['cls', 'sty', 'bst', 'bib', 'bbx', 'cbx']:
                print('ERROR: unknown type', type)
                sys.exit(1)
else:
    # if no parameter is specified, assume all
    types = ['cls', 'sty', 'bst', 'bib', 'bbx', 'cbx']

#
# MS-DOS and MS-Windows define $COMSPEC or $ComSpec and use `;' to separate
# directories in path lists whereas Unix uses `:'.  Make an exception for
# Cygwin, where we could have either teTeX (using `:') or MikTeX (using `;').
# Create a variable that holds the right character to be used by the scripts.
path_sep = os.pathsep
if sys.platform == 'cygwin':
    if ';' in cmdOutput('kpsewhich --show-path=.tex'):
        path_sep = ';'
    else:
        path_sep = ':'

# process each file type
for type in types:
    print("Indexing files of type", type)
    if type == 'cls':
        outfile = cls_stylefile
        kpsetype = '.tex'
    elif type == 'sty':
        outfile = sty_stylefile
        kpsetype = '.tex'
    elif type == 'bst':
        outfile = bst_stylefile
        kpsetype = '.bst'
    elif type == 'bib':
        outfile = bib_files
        kpsetype = '.bib'
    elif type == 'bbx':
        outfile = bbx_files
        kpsetype = '.tex'
    elif type == 'cbx':
        outfile = cbx_files
        kpsetype = '.tex'

    dirs = cmdOutput('kpsewhich --show-path=' + kpsetype).replace('!!', '').strip()
    # remove excessive //
    dirs = re.sub('//+', '/', dirs)
    
    file_ext = '.' + type
    out = open(outfile, 'w')
    for dir in dirs.split(path_sep):
        # for each valid directory
        if not os.path.isdir(dir):
            continue
        # walk down the file hierarchy
        visited = set()
        for root,dirs,files in os.walk(dir, followlinks=True):
            # prevent inifinite recursion
            recurse = []
            for dir in dirs:
                st = os.stat(os.path.join(root, dir))
                key = st.st_dev, st.st_ino
                if key not in visited:
                    visited.add(key)
                    recurse.append(dir)
            dirs[:] = recurse
            # check file type
            for file in files:
                if len(file) > 4 and file[-4:] == file_ext:
                    # force the use of / since miktex uses / even under windows
                    print(root.replace('\\', '/') + '/' + file, file=out)
    out.close()