lyx_mirror/lib/configure.py

#! /usr/bin/python3
# -*- coding: utf-8 -*-
#
# file configure.py
# This file is part of LyX, the document processor.
# Licence details can be found in the file COPYING.

# \author Bo Peng
# Full author contact details are available in file CREDITS.

from __future__ import print_function
import glob, logging, os, errno, re, shutil, subprocess, sys, stat

# set up logging
logging.basicConfig(level = logging.DEBUG,
    format = '%(levelname)s: %(message)s', # ignore application name
    filename = 'configure.log',
    filemode = 'w')
#
# Add a handler to log to console
console = logging.StreamHandler()
console.setLevel(logging.INFO) # the console only print out general information
formatter = logging.Formatter('%(message)s') # only print out the message itself
console.setFormatter(formatter)
logger = logging.getLogger('LyX')
logger.addHandler(console)

def quoteIfSpace(name):
    " utility function: quote name if it contains spaces "
    if ' ' in name:
        return '"' + name + '"'
    else:
        return name

def writeToFile(filename, lines, append = False):
    " utility function: write or append lines to filename "
    if append:
        file = open(filename, 'a')
    else:
        file = open(filename, 'w')
    file.write(lines)
    file.close()


def addToRC(lines):
    ''' utility function: shortcut for appending lines to outfile
        add newline at the end of lines.
    '''
    if lines.strip() != '':
        writeToFile(outfile, lines + '\n', append = True)
        logger.debug('Add to RC:\n' + lines + '\n\n')


def removeFiles(filenames):
    '''utility function: 'rm -f'
        ignore errors when file does not exist, or is a directory.
    '''
    for file in filenames:
        try:
            os.remove(file)
            logger.debug('Removing file %s' % file)
        except OSError as e:
            if e.errno == errno.ENOENT: # no such file or directory
                logger.debug('No need to remove file %s (it does not exists)' % file)
            elif e.errno == errno.EISDIR: # is a directory
                logger.debug('Failed to remove file %s (it is a directory)' % file)
            else:
                logger.debug('Failed to remove file %s' % file)
            pass


def cmdOutput(cmd, asynchronous = False):
    '''utility function: run a command and get its output as a string
        cmd: command to run
        asynchronous: if False, return whole output as a string, otherwise
               return the stdout handle from which the output can be
               read (the caller is then responsible for closing it)
    '''
    if os.name == 'nt':
        b = False
        if sys.version_info[0] < 3:
            cmd = 'cmd /d /c pushd ' + shortPath(os.getcwdu()) + '&' + cmd
        else:
            cmd = 'cmd /d /c pushd ' + shortPath(os.getcwd()) + '&' + cmd
    else:
        b = True
    pipe = subprocess.Popen(cmd, shell=b, close_fds=b, stdin=subprocess.PIPE,
                            stdout=subprocess.PIPE, universal_newlines=True)
    pipe.stdin.close()
    if asynchronous:
        return pipe.stdout
    output = pipe.stdout.read()
    pipe.stdout.close()
    return output.strip()


def shortPath(path):
    ''' On Windows, return the short version of "path" if possible '''
    if os.name == 'nt':
        from ctypes import windll, create_unicode_buffer
        GetShortPathName = windll.kernel32.GetShortPathNameW
        shortlen = GetShortPathName(path, 0, 0)
        shortpath = create_unicode_buffer(shortlen)
        if GetShortPathName(path, shortpath, shortlen):
            return shortpath.value
    return path


def setEnviron():
    ''' I do not really know why this is useful, but we might as well keep it.
        NLS nuisances.
        Only set these to C if already set.  These must not be set unconditionally
        because not all systems understand e.g. LANG=C (notably SCO).
        Fixing LC_MESSAGES prevents Solaris sh from translating var values in set!
        Non-C LC_CTYPE values break the ctype check.
    '''
    os.environ['LANG'] = os.getenv('LANG', 'C')
    os.environ['LC'] = os.getenv('LC_ALL', 'C')
    os.environ['LC_MESSAGE'] = os.getenv('LC_MESSAGE', 'C')
    os.environ['LC_CTYPE'] = os.getenv('LC_CTYPE', 'C')


def copy_tree(src, dst, preserve_symlinks=False, level=0):
    ''' Copy an entire directory tree 'src' to a new location 'dst'.

    Code inspired from distutils.copy_tree.
         Copying ignores non-regular files and the cache directory.
    Pipes may be present as leftovers from LyX for lyx-server.

    If 'preserve_symlinks' is true, symlinks will be
    copied as symlinks (on platforms that support them!); otherwise
    (the default), the destination of the symlink will be copied.
    '''

    if not os.path.isdir(src):
        raise FileError("cannot copy tree '%s': not a directory" % src)
    try:
        names = os.listdir(src)
    except os.error as oserror:
        (errno, errstr) = oserror.args
        raise FileError("error listing files in '%s': %s" % (src, errstr))

    if not os.path.isdir(dst):
        os.makedirs(dst)

    outputs = []

    for name in names:
        src_name = os.path.join(src, name)
        dst_name = os.path.join(dst, name)
        if preserve_symlinks and os.path.islink(src_name):
            link_dest = os.readlink(src_name)
            os.symlink(link_dest, dst_name)
            outputs.append(dst_name)
        elif level == 0 and name == 'cache':
            logger.info("Skip cache %s", src_name)
        elif os.path.isdir(src_name):
            outputs.extend(
                copy_tree(src_name, dst_name, preserve_symlinks, level=(level + 1)))
        elif stat.S_ISREG(os.stat(src_name).st_mode) or os.path.islink(src_name):
            shutil.copy2(src_name, dst_name)
            outputs.append(dst_name)
        else:
            logger.info("Ignore non-regular file %s", src_name)

    return outputs


def checkUpgrade():
    ''' Check for upgrade from previous version '''
    cwd = os.getcwd()
    basename = os.path.basename( cwd )
    lyxrc = os.path.join(cwd, outfile)
    if not os.path.isfile( lyxrc ) and basename.endswith( version_suffix ) :
        logger.info('Checking for upgrade from previous version.')
        parent = os.path.dirname(cwd)
        appname = basename[:(-len(version_suffix))]
        for version in ['-2.3', '-2.2', '-2.1', '-2.0', '-1.6' ]:
            logger.debug('Checking for upgrade from previous version ' + version)
            previous = os.path.join(parent, appname + version)
            logger.debug('previous = ' + previous)
            if os.path.isdir( previous ):
                logger.info('Found directory "%s".', previous)
                copy_tree( previous, cwd, True )
                logger.info('Content copied from directory "%s".', previous)
                return


def createDirectories():
    ''' Create the build directories if necessary '''
    for dir in ['bind', 'clipart', 'doc', 'examples', 'images', 'kbd',
        'layouts', 'scripts', 'templates', 'ui' ]:
        if not os.path.isdir( dir ):
            try:
                os.mkdir( dir)
                logger.debug('Create directory %s.' % dir)
            except:
                logger.error('Failed to create directory %s.' % dir)
                sys.exit(1)


def checkTeXPaths():
    ''' Determine the path-style needed by the TeX engine on Win32 (Cygwin) '''
    windows_style_tex_paths = ''
    if LATEX == '':
        return windows_style_tex_paths
    if os.name == 'nt' or sys.platform == 'cygwin':
        from tempfile import mkstemp
        fd, tmpfname = mkstemp(suffix='.ltx')
        if os.name == 'nt':
            encoding = sys.getfilesystemencoding()
            if sys.version_info[0] < 3:
                inpname = shortPath(unicode(tmpfname, encoding)).replace('\\', '/')
            else:
                inpname = shortPath(tmpfname).replace('\\', '/') 
        else:
            inpname = cmdOutput('cygpath -m ' + tmpfname)
        logname = os.path.basename(re.sub("(?i).ltx", ".log", inpname))
        inpname = inpname.replace('~', '\\string~')
        os.write(fd, b'\\relax')
        os.close(fd)
        latex_out = cmdOutput(r'latex "\nonstopmode\input{%s}\makeatletter\@@end"'
                              % inpname)
        if 'Error' in latex_out:
            latex_out = cmdOutput(r'latex "\nonstopmode\input{\"%s\"}\makeatletter\@@end"'
                                  % inpname)
        if 'Error' in latex_out:
            logger.warning("configure: TeX engine needs posix-style paths in latex files")
            windows_style_tex_paths = 'false'
        else:
            logger.info("configure: TeX engine needs windows-style paths in latex files")
            windows_style_tex_paths = 'true'
        removeFiles([tmpfname, logname, 'texput.log'])
    return windows_style_tex_paths


## Searching some useful programs
def checkProg(description, progs, rc_entry = [], path = [], not_found = ''):
    '''
        This function will search a program in $PATH plus given path
        If found, return directory and program name (not the options).

        description: description of the program

        progs: check programs, for each prog, the first word is used
            for searching but the whole string is used to replace
            %% for a rc_entry. So, feel free to add '$$i' etc for programs.

        path: additional paths (will be prepended to the program name)

        rc_entry: entry to outfile, can be
            1. emtpy: no rc entry will be added
            2. one pattern: %% will be replaced by the first found program,
                or '' if no program is found.
            3. several patterns for each prog and not_found. This is used
                when different programs have different usages. If you do not
                want not_found entry to be added to the RC file, you can specify
                an entry for each prog and use '' for the not_found entry.

        not_found: the value that should be used instead of '' if no program
            was found

    '''
    # one rc entry for each progs plus not_found entry
    if len(rc_entry) > 1 and len(rc_entry) != len(progs) + 1:
        logger.error("rc entry should have one item or item "
                     "for each prog and not_found.")
        sys.exit(2)
    logger.info('checking for ' + description + '...')
    ## print '(' + ','.join(progs) + ')',
    additional_path = path
    path = os.environ["PATH"].split(os.pathsep) + additional_path
    extlist = ['']
    if "PATHEXT" in os.environ:
        extlist = extlist + os.environ["PATHEXT"].split(os.pathsep)
    global java, perl
    unquoted_space = re.compile(r'''((?:[^ "']|"[^"]*"|'[^']*')+)''')
    for idx in range(len(progs)):
        # ac_prog may have options, ac_word is the command name
        ac_prog = progs[idx].replace('"', '\\"')
        ac_word = unquoted_space.split(progs[idx])[1::2][0].strip('"')
        if (ac_word.endswith('.class') or ac_word.endswith('.jar')) and java == '':
            continue
        if ac_word.endswith('.pl') and perl == '':
            continue
        msg = '+checking for "' + ac_word + '"... '
        for ac_dir in path:
            if hasattr(os, "access") and not os.access(ac_dir, os.F_OK):
                continue
            for ext in extlist:
                if os.path.isfile( os.path.join(ac_dir, ac_word + ext) ):
                    logger.info(msg + ' yes')
                    # deal with java and perl
                    if ac_word.endswith('.class'):
                        ac_prog = ac_prog.replace(ac_word, r'%s \"%s\"'
                                    % (java, os.path.join(ac_dir, ac_word[:-6])))
                    elif ac_word.endswith('.jar'):
                        ac_prog = ac_prog.replace(ac_word, r'%s -jar \"%s\"'
                                    % (java, os.path.join(ac_dir, ac_word)))
                    elif ac_word.endswith('.pl'):
                        ac_prog = ac_prog.replace(ac_word, r'%s -w \"%s\"'
                                    % (perl, os.path.join(ac_dir, ac_word)))
                    elif ac_dir in additional_path:
                        ac_prog = ac_prog.replace(ac_word, r'\"%s\"'
                                    % (os.path.join(ac_dir, ac_word)))
                    # write rc entries for this command
                    if len(rc_entry) == 1:
                        addToRC(rc_entry[0].replace('%%', ac_prog))
                    elif len(rc_entry) > 1:
                        addToRC(rc_entry[idx].replace('%%', ac_prog))
                    return [ac_dir, ac_word]
        # if not successful
        logger.info(msg + ' no')
    # write rc entries for 'not found'
    if len(rc_entry) > 0:  # the last one.
        addToRC(rc_entry[-1].replace('%%', not_found))
    return ['', not_found]


def checkProgAlternatives(description, progs, rc_entry = [],
                          alt_rc_entry = [], path = [], not_found = ''):
    '''
        The same as checkProg, but additionally, all found programs will be added
        as alt_rc_entries
    '''
    # one rc entry for each progs plus not_found entry
    if len(rc_entry) > 1 and len(rc_entry) != len(progs) + 1:
        logger.error("rc entry should have one item or item for each prog and not_found.")
        sys.exit(2)
    logger.info('checking for ' + description + '...')
    ## print '(' + ','.join(progs) + ')',
    additional_path = path
    path = os.environ["PATH"].split(os.pathsep) + additional_path
    extlist = ['']
    if "PATHEXT" in os.environ:
        extlist = extlist + os.environ["PATHEXT"].split(os.pathsep)
    found_prime = False
    real_ac_dir = ''
    real_ac_word = not_found
    global java, perl
    for idx in range(len(progs)):
        # ac_prog may have options, ac_word is the command name
        ac_prog = progs[idx]
        ac_word = ac_prog.split(' ')[0]
        if (ac_word.endswith('.class') or ac_word.endswith('.jar')) and java == '':
            continue
        if ac_word.endswith('.pl') and perl == '':
            continue
        msg = '+checking for "' + ac_word + '"... '
        found_alt = False
        for ac_dir in path:
            if hasattr(os, "access") and not os.access(ac_dir, os.F_OK):
                continue
            for ext in extlist:
                if os.path.isfile( os.path.join(ac_dir, ac_word + ext) ):
                    logger.info(msg + ' yes')
                    pr = re.compile(r'(\\\S+)(.*)$')
                    m = None
                    # deal with java and perl
                    if ac_word.endswith('.class'):
                        ac_prog = ac_prog.replace(ac_word, r'%s \"%s\"'
                                    % (java, os.path.join(ac_dir, ac_word[:-6])))
                    elif ac_word.endswith('.jar'):
                        ac_prog = ac_prog.replace(ac_word, r'%s -jar \"%s\"'
                                    % (java, os.path.join(ac_dir, ac_word)))
                    elif ac_word.endswith('.pl'):
                        ac_prog = ac_prog.replace(ac_word, r'%s -w \"%s\"'
                                    % (perl, os.path.join(ac_dir, ac_word)))
                    elif ac_dir in additional_path:
                        ac_prog = ac_prog.replace(ac_word, r'\"%s\"'
                                    % (os.path.join(ac_dir, ac_word)))
                    # write rc entries for this command
                    if found_prime == False:
                        if len(rc_entry) == 1:
                            addToRC(rc_entry[0].replace('%%', ac_prog))
                        elif len(rc_entry) > 1:
                            addToRC(rc_entry[idx].replace('%%', ac_prog))
                        real_ac_dir = ac_dir
                        real_ac_word = ac_word
                        found_prime = True
                    if len(alt_rc_entry) == 1:
                        alt_rc = alt_rc_entry[0]
                        if alt_rc == "":
                            # if no explicit alt_rc is given, construct one
                            m = pr.match(rc_entry[0])
                            if m:
                                alt_rc = m.group(1) + "_alternatives" + m.group(2)
                        addToRC(alt_rc.replace('%%', ac_prog))
                    elif len(alt_rc_entry) > 1:
                        alt_rc = alt_rc_entry[idx]
                        if alt_rc == "":
                            # if no explicit alt_rc is given, construct one
                            m = pr.match(rc_entry[idx])
                            if m:
                                alt_rc = m.group(1) + "_alternatives" + m.group(2)
                        addToRC(alt_rc.replace('%%', ac_prog))
                    found_alt = True
                    break
            if found_alt:
                break
        if found_alt == False:
            # if not successful
            logger.info(msg + ' no')
    if found_prime:
        return [real_ac_dir, real_ac_word]
    # write rc entries for 'not found'
    if len(rc_entry) > 0:  # the last one.
        addToRC(rc_entry[-1].replace('%%', not_found))
    return ['', not_found]


def addAlternatives(rcs, alt_type):
    '''
        Returns a \\prog_alternatives string to be used as an alternative
        rc entry.  alt_type can be a string or a list of strings.
    '''
    r = re.compile(r'\\Format (\S+).*$')
    m = None
    alt = ''
    alt_token = '\\%s_alternatives '
    if isinstance(alt_type, str):
        alt_tokens = [alt_token % alt_type]
    else:
        alt_tokens = [alt_token % s for s in alt_type]
    for idxx in range(len(rcs)):
        if len(rcs) == 1:
            m = r.match(rcs[0])
            if m:
                alt = '\n'.join([s + m.group(1) + ' "%%"' for s in alt_tokens])
        elif len(rcs) > 1:
            m = r.match(rcs[idxx])
            if m:
                if idxx > 0:
                    alt += '\n'
                alt += '\n'.join([s + m.group(1) + ' "%%"' for s in alt_tokens])
    return alt


def listAlternatives(progs, alt_type, rc_entry = []):
    '''
        Returns a list of \\prog_alternatives strings to be used as alternative
        rc entries.  alt_type can be a string or a list of strings.
    '''
    if len(rc_entry) > 1 and len(rc_entry) != len(progs) + 1:
        logger.error("rc entry should have one item or item for each prog and not_found.")
        sys.exit(2)
    alt_rc_entry = []
    for idx in range(len(progs)):
        if len(rc_entry) == 1:
            rcs = rc_entry[0].split('\n')
            alt = addAlternatives(rcs, alt_type)
            alt_rc_entry.insert(0, alt)
        elif len(rc_entry) > 1:
            rcs = rc_entry[idx].split('\n')
            alt = addAlternatives(rcs, alt_type)
            alt_rc_entry.insert(idx, alt)
    return alt_rc_entry


def checkViewer(description, progs, rc_entry = [], path = []):
    ''' The same as checkProgAlternatives, but for viewers '''
    alt_rc_entry = listAlternatives(progs, 'viewer', rc_entry)
    return checkProgAlternatives(description, progs, rc_entry,
                                 alt_rc_entry, path, not_found = 'auto')


def checkEditor(description, progs, rc_entry = [], path = []):
    ''' The same as checkProgAlternatives, but for editors '''
    alt_rc_entry = listAlternatives(progs, 'editor', rc_entry)
    return checkProgAlternatives(description, progs, rc_entry,
                                 alt_rc_entry, path, not_found = 'auto')


def checkViewerNoRC(description, progs, rc_entry = [], path = []):
    ''' The same as checkViewer, but do not add rc entry '''
    alt_rc_entry = listAlternatives(progs, 'viewer', rc_entry)
    rc_entry = []
    return checkProgAlternatives(description, progs, rc_entry,
                                 alt_rc_entry, path, not_found = 'auto')


def checkEditorNoRC(description, progs, rc_entry = [], path = []):
    ''' The same as checkViewer, but do not add rc entry '''
    alt_rc_entry = listAlternatives(progs, 'editor', rc_entry)
    rc_entry = []
    return checkProgAlternatives(description, progs, rc_entry,
                                 alt_rc_entry, path, not_found = 'auto')


def checkViewerEditor(description, progs, rc_entry = [], path = []):
    ''' The same as checkProgAlternatives, but for viewers and editors '''
    alt_rc_entry = listAlternatives(progs, ['editor', 'viewer'], rc_entry)
    return checkProgAlternatives(description, progs, rc_entry,
                                 alt_rc_entry, path, not_found = 'auto')


def checkDTLtools():
    ''' Check whether DTL tools are available (Windows only) '''
    # Find programs! Returned path is not used now
    if ((os.name == 'nt' or sys.platform == 'cygwin') and
            checkProg('DVI to DTL converter', ['dv2dt']) != ['', ''] and
            checkProg('DTL to DVI converter', ['dt2dv']) != ['', '']):
        dtl_tools = True
    else:
        dtl_tools = False
    return dtl_tools

def checkInkscape():
    ''' Check whether Inkscape is available and return the full path (Windows only) '''
    ''' On Mac OS (darwin) a wrapper is used - therefore the version is checked '''
    ''' The answer of the real inkscape is validated and a fake binary used if this fails '''
    if sys.platform == 'darwin':
        version_string = cmdOutput("inkscape --version")
        if version_string.startswith('Inkscape'):
            return 'inkscape'
        else:
            return 'inkscape-binary'
    elif os.name != 'nt':
        return 'inkscape'
    if sys.version_info[0] < 3:
        import _winreg as winreg
    else:
        import winreg
    aReg = winreg.ConnectRegistry(None, winreg.HKEY_CLASSES_ROOT)
    try:
        aKey = winreg.OpenKey(aReg, r"inkscape.svg\DefaultIcon")
        val = winreg.QueryValueEx(aKey, "")
        return str(val[0]).split('"')[1]
    except EnvironmentError:
        try:
            aKey = winreg.OpenKey(aReg, r"Applications\inkscape.exe\shell\open\command")
            val = winreg.QueryValueEx(aKey, "")
            return str(val[0]).split('"')[1]
        except EnvironmentError:
            return 'inkscape'

def checkLatex(dtl_tools):
    ''' Check latex, return lyx_check_config '''
    path, LATEX = checkProg('a Latex2e program', ['latex $$i', 'latex2e $$i'])
    path, PPLATEX = checkProg('a DVI postprocessing program', ['pplatex $$i'])
    #-----------------------------------------------------------------
    path, PLATEX = checkProg('pLaTeX, the Japanese LaTeX', ['platex $$i'])
    if PLATEX != '':
        # check if PLATEX is pLaTeX2e
        writeToFile('chklatex.ltx', r'\nonstopmode\makeatletter\@@end')
        # run platex on chklatex.ltx and check result
        if cmdOutput(PLATEX + ' chklatex.ltx').find('pLaTeX2e') != -1:
            # We have the Japanese pLaTeX2e
            addToRC(r'\converter platex   dvi       "%s"   "latex=platex"' % PLATEX)
        else:
            PLATEX = ''
            removeFiles(['chklatex.ltx', 'chklatex.log'])
    #-----------------------------------------------------------------
    # use LATEX to convert from latex to dvi if PPLATEX is not available
    if PPLATEX == '':
        PPLATEX = LATEX
    if dtl_tools:
        # Windows only: DraftDVI
        addToRC(r'''\converter latex      dvi2       "%s"	"latex"
\converter dvi2       dvi        "python -tt $$s/scripts/clean_dvi.py $$i $$o"	""''' % PPLATEX)
    else:
        addToRC(r'\converter latex      dvi        "%s"	"latex"' % PPLATEX)
    # no latex
    if LATEX != '':
        # Check if latex is usable
        writeToFile('chklatex.ltx', r'''
\nonstopmode
\ifx\undefined\documentclass\else
  \message{ThisIsLaTeX2e}
\fi
\makeatletter
\@@end
''')
        # run latex on chklatex.ltx and check result
        if cmdOutput(LATEX + ' chklatex.ltx').find('ThisIsLaTeX2e') != -1:
            # valid latex2e
            return LATEX
        else:
            logger.warning("Latex not usable (not LaTeX2e) ")
        # remove temporary files
        removeFiles(['chklatex.ltx', 'chklatex.log'])
    return ''


def checkLuatex():
    ''' Check if luatex is there '''
    path, LUATEX = checkProg('LuaTeX', ['lualatex $$i'])
    path, DVILUATEX = checkProg('LuaTeX (DVI)', ['dvilualatex $$i'])
    if LUATEX != '':
        addToRC(r'\converter luatex      pdf5       "%s"	"latex=lualatex"' % LUATEX)
    if DVILUATEX != '':
        addToRC(r'\converter dviluatex   dvi3        "%s"	"latex=dvilualatex"' % DVILUATEX)


def checkModule(module):
    ''' Check for a Python module, return the status '''
    msg = 'checking for "' + module + ' module"... '
    try:
      __import__(module)
      logger.info(msg + ' yes')
      return True
    except ImportError:
      logger.info(msg + ' no')
      return False


texteditors = ['xemacs', 'gvim', 'kedit', 'kwrite', 'kate',
               'nedit', 'gedit', 'geany', 'leafpad', 'mousepad',
               'xed', 'notepad', 'WinEdt', 'WinShell', 'PSPad']

def checkFormatEntries(dtl_tools):
    ''' Check all formats (\Format entries) '''
    checkViewerEditor('a Tgif viewer and editor', ['tgif'],
        rc_entry = [r'\Format tgif      "obj, tgo" Tgif                 "" "%%"	"%%"	"vector"	"application/x-tgif"'])
    #
    checkViewerEditor('a FIG viewer and editor', ['xfig', 'jfig3-itext.jar', 'jfig3.jar'],
        rc_entry = [r'\Format fig        fig     FIG                    "" "%%"	"%%"	"vector"	"application/x-xfig"'])
    #
    checkViewerEditor('a Dia viewer and editor', ['dia'],
        rc_entry = [r'\Format dia        dia     DIA                    "" "%%"	"%%"	"vector,zipped=native", "application/x-dia-diagram"'])
    #
    checkViewerEditor('an OpenDocument drawing viewer and editor', ['libreoffice', 'lodraw', 'ooffice', 'oodraw', 'soffice'],
        rc_entry = [r'\Format odg        "odg, sxd" "OpenDocument drawing"   "" "%%"	"%%"	"vector,zipped=native"	"application/vnd.oasis.opendocument.graphics"'])
    #
    checkViewerEditor('a Grace viewer and editor', ['xmgrace'],
        rc_entry = [r'\Format agr        agr     Grace                  "" "%%"	"%%"	"vector"	""'])
    #
    checkViewerEditor('a FEN viewer and editor', ['xboard -lpf $$i -mode EditPosition'],
        rc_entry = [r'\Format fen        fen     FEN                    "" "%%"	"%%"	""	""'])
    #
    checkViewerEditor('a SVG viewer and editor', [inkscape_gui],
        rc_entry = [r'''\Format svg        "svg" SVG                "" "%%" "%%"	"vector"	"image/svg+xml"
\Format svgz       "svgz" "SVG (compressed)" "" "%%" "%%"	"vector,zipped=native"	""'''],
        path = [inkscape_path])
    #
    imageformats = r'''\Format bmp        bmp     BMP                    "" "%s"	"%s"	""	"image/x-bmp"
\Format gif        gif     GIF                    "" "%s"	"%s"	""	"image/gif"
\Format jpg       "jpg, jpeg" JPEG                "" "%s"	"%s"	""	"image/jpeg"
\Format pbm        pbm     PBM                    "" "%s"	"%s"	""	"image/x-portable-bitmap"
\Format pgm        pgm     PGM                    "" "%s"	"%s"	""	"image/x-portable-graymap"
\Format png        png     PNG                    "" "%s"	"%s"	""	"image/x-png"
\Format ppm        ppm     PPM                    "" "%s"	"%s"	""	"image/x-portable-pixmap"
\Format tiff       tif     TIFF                   "" "%s"	"%s"	""	"image/tiff"
\Format xbm        xbm     XBM                    "" "%s"	"%s"	""	"image/x-xbitmap"
\Format xpm        xpm     XPM                    "" "%s"	"%s"	""	"image/x-xpixmap"'''
    path, iv = checkViewerNoRC('a raster image viewer',
        ['xv', 'gwenview', 'kview',
         'eog', 'xviewer', 'ristretto', 'gpicview', 'lximage-qt',
         'xdg-open', 'gimp-remote', 'gimp'],
        rc_entry = [imageformats])
    path, ie = checkEditorNoRC('a raster image editor',
        ['gimp-remote', 'gimp'], rc_entry = [imageformats])
    addToRC(imageformats % ((iv, ie)*10))
    #
    checkViewerEditor('a text editor', texteditors,
        rc_entry = [r'''\Format asciichess asc    "Plain text (chess output)"  "" ""	"%%"	""	""
\Format docbook    sgml    DocBook                B  ""	"%%"	"document,menu=export"	""
\Format docbook-xml xml   "DocBook (XML)"         "" ""	"%%"	"document,menu=export"	"application/docbook+xml"
\Format dot        dot    "Graphviz Dot"          "" ""	"%%"	"vector"	"text/vnd.graphviz"
\Format dviluatex  tex    "LaTeX (dviluatex)"     "" "" "%%"	"document,menu=export"	""
\Format platex     tex    "LaTeX (pLaTeX)"        "" "" "%%" 	"document,menu=export"	""
\Format literate   nw      NoWeb                  N  ""	"%%"	"document,menu=export"	""
\Format sweave     Rnw    "Sweave"                S  "" "%%"	"document,menu=export"	""
\Format sweave-ja  Rnw    "Sweave (Japanese)"     S  "" "%%"	"document,menu=export"	""
\Format r          R      "R/S code"              "" "" "%%"	"document,menu=export"	""
\Format knitr      Rnw    "Rnw (knitr)"           "" "" "%%"	"document,menu=export"	""
\Format knitr-ja   Rnw    "Rnw (knitr, Japanese)" "" "" "%%"	"document,menu=export"	""
\Format lilypond-book    lytex "LilyPond book (LaTeX)"   "" ""	"%%"	"document,menu=export"	""
\Format lilypond-book-ja lytex "LilyPond book (pLaTeX)"   "" ""	"%%"	"document,menu=export"	""
\Format latex      tex    "LaTeX (plain)"         L  ""	"%%"	"document,menu=export"	"text/x-tex"
\Format luatex     tex    "LaTeX (LuaTeX)"        "" ""	"%%"	"document,menu=export"	""
\Format pdflatex   tex    "LaTeX (pdflatex)"      "" ""	"%%"	"document,menu=export"	""
\Format xetex      tex    "LaTeX (XeTeX)"         "" ""	"%%"	"document,menu=export"	""
\Format latexclipboard tex "LaTeX (clipboard)"    "" ""	"%%"	""	""
\Format text       txt    "Plain text"            a  ""	"%%"	"document,menu=export"	"text/plain"
\Format text2      txt    "Plain text (pstotext)" "" ""	"%%"	"document"	""
\Format text3      txt    "Plain text (ps2ascii)" "" ""	"%%"	"document"	""
\Format text4      txt    "Plain text (catdvi)"   "" ""	"%%"	"document"	""
\Format textparagraph txt "Plain Text, Join Lines" "" ""	"%%"	"document"	""
\Format beamer.info pdf.info   "Info (Beamer)"         "" ""   "%%"    "document,menu=export"	""''' ])
   #Lilypond files have special editors, but fall back to plain text editors
    checkViewerEditor('a lilypond editor',
        ['frescobaldi'] + texteditors,
        rc_entry = [r'''\Format lilypond   ly     "LilyPond music"        "" ""	"%%"	"vector"	"text/x-lilypond"''' ])
   #Spreadsheets using ssconvert from gnumeric
    checkViewer('gnumeric spreadsheet software', ['gnumeric'],
      rc_entry = [r'''\Format gnumeric gnumeric "Gnumeric spreadsheet" "" ""    "%%"   "document"	"application/x-gnumeric"
\Format excel      xls    "Excel spreadsheet"      "" "" "%%"    "document"	"application/vnd.ms-excel"
\Format excel2     xlsx   "MS Excel Office Open XML" "" "" "%%" "document"	"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
\Format html_table html   "HTML Table (for spreadsheets)"      "" "" "%%"    "document"	"text/html"
\Format oocalc     ods    "OpenDocument spreadsheet" "" "" "%%"    "document"	"application/vnd.oasis.opendocument.spreadsheet"'''])
 #
    checkViewer('an HTML previewer', ['firefox', 'mozilla file://$$p$$i', 'netscape'],
        rc_entry = [r'\Format xhtml      xhtml   "LyXHTML"              y "%%" ""    "document,menu=export"	"application/xhtml+xml"'])
 #
    checkEditor('a BibTeX editor', ['jabref', 'JabRef',
        'pybliographic', 'bibdesk', 'gbib', 'kbib',
        'kbibtex', 'sixpack', 'bibedit', 'tkbibtex', 'TeXnicCenter'] +
        texteditors,
        rc_entry = [r'''\Format bibtex bib    "BibTeX"         "" ""	"%%"	""	"text/x-bibtex"''' ])
    #
    #checkProg('a Postscript interpreter', ['gs'],
    #  rc_entry = [ r'\ps_command "%%"' ])
    checkViewer('a Postscript previewer',
                ['kghostview', 'okular', 'qpdfview --unique',
                 'evince', 'xreader',
                 'gv', 'ghostview -swap', 'gsview64', 'gsview32'],
        rc_entry = [r'''\Format eps        eps     EPS                    "" "%%"	""	"vector"	"image/x-eps"
\Format eps2       eps    "EPS (uncropped)"       "" "%%"	""	"vector"	""
\Format eps3       eps    "EPS (cropped)"         "" "%%"	""	"document"	""
\Format ps         ps      Postscript             t  "%%"	""	"document,vector,menu=export"	"application/postscript"'''])
    # for xdg-open issues look here: http://www.mail-archive.com/lyx-devel@lists.lyx.org/msg151818.html
    # maybe use "bestApplication()" from https://github.com/jleclanche/python-mime
    # the MIME type is set for pdf6, because that one needs to be autodetectable by libmime
    checkViewer('a PDF previewer',
                ['pdfview', 'kpdf', 'okular', 'qpdfview --unique',
                 'evince', 'xreader', 'kghostview', 'xpdf', 'SumatraPDF',
                 'acrobat', 'acroread', 'mupdf',
                 'gv', 'ghostview', 'AcroRd32', 'gsview64', 'gsview32'],
        rc_entry = [r'''\Format pdf        pdf    "PDF (ps2pdf)"          P  "%%"	""	"document,vector,menu=export"	""
\Format pdf2       pdf    "PDF (pdflatex)"        F  "%%"	""	"document,vector,menu=export"	""
\Format pdf3       pdf    "PDF (dvipdfm)"         m  "%%"	""	"document,vector,menu=export"	""
\Format pdf4       pdf    "PDF (XeTeX)"           X  "%%"	""	"document,vector,menu=export"	""
\Format pdf5       pdf    "PDF (LuaTeX)"          u  "%%"	""	"document,vector,menu=export"	""
\Format pdf6       pdf    "PDF (graphics)"        "" "%%"	""	"vector"	"application/pdf"
\Format pdf7       pdf    "PDF (cropped)"         "" "%%"	""	"document,vector"	""
\Format pdf8       pdf    "PDF (lower resolution)"         "" "%%"	""	"document,vector"	""'''])
    #
    checkViewer('a DVI previewer', ['xdvi', 'kdvi', 'okular',
                                    'evince', 'xreader',
                                    'yap', 'dviout -Set=!m'],
        rc_entry = [r'''\Format dvi        dvi     DVI                    D  "%%"	""	"document,vector,menu=export"	"application/x-dvi"
\Format dvi3       dvi     "DVI (LuaTeX)"          V  "%%"	""	"document,vector,menu=export"	""'''])
    if dtl_tools:
        # Windows only: DraftDVI
        addToRC(r'\Format dvi2       dvi     DraftDVI               ""	""	""	"vector"	""')
    #
    checkViewer('an HTML previewer', ['firefox', 'mozilla file://$$p$$i', 'netscape'],
        rc_entry = [r'\Format html      "html, htm" HTML                H  "%%"	""	"document,menu=export"	"text/html"'])
    #
    checkViewerEditor('Noteedit', ['noteedit'],
        rc_entry = [r'\Format noteedit   not     Noteedit               "" "%%"	"%%"	"vector"	""'])
    #
    checkViewerEditor('an OpenDocument viewer', ['libreoffice', 'lwriter', 'lowriter', 'oowriter', 'swriter', 'abiword'],
        rc_entry = [r'''\Format odt        odt     "OpenDocument (tex4ht)"  "" "%%"	"%%"	"document,vector,menu=export"	"application/vnd.oasis.opendocument.text"
\Format odt2       odt    "OpenDocument (eLyXer)"  "" "%%"	"%%"	"document,vector,menu=export"	"application/vnd.oasis.opendocument.text"
\Format odt3       odt    "OpenDocument (Pandoc)"  "" "%%"	"%%"	"document,vector,menu=export"	"application/vnd.oasis.opendocument.text"
\Format sxw        sxw    "OpenOffice.Org (sxw)"  "" ""	""	"document,vector"	"application/vnd.sun.xml.writer"'''])
    #
    checkViewerEditor('a Rich Text and Word viewer', ['libreoffice', 'lwriter', 'lowriter', 'oowriter', 'swriter', 'abiword'],
        rc_entry = [r'''\Format rtf        rtf    "Rich Text Format"      "" "%%"	"%%"	"document,vector,menu=export"	"application/rtf"
\Format word       doc    "MS Word"               W  "%%"	"%%"	"document,vector,menu=export"	"application/msword"
\Format word2      docx    "MS Word Office Open XML"               O  "%%"	"%%"	"document,vector,menu=export"	"application/vnd.openxmlformats-officedocument.wordprocessingml.document"'''])
    #
    # entries that do not need checkProg
    addToRC(r'''\Format csv        csv    "Table (CSV)"           "" ""	""	"document"	"text/csv"
\Format fax        ""      Fax                    "" ""	""	"document"	""
\Format lyx        lyx     LyX                    "" ""	""	""	"application/x-lyx"
\Format lyx13x     13.lyx "LyX 1.3.x"             "" ""	""	"document"	""
\Format lyx14x     14.lyx "LyX 1.4.x"             "" ""	""	"document"	""
\Format lyx15x     15.lyx "LyX 1.5.x"             "" ""	""	"document"	""
\Format lyx16x     16.lyx "LyX 1.6.x"             "" ""	""	"document"	""
\Format lyx20x     20.lyx "LyX 2.0.x"             "" ""	""	"document"	""
\Format lyx21x     21.lyx "LyX 2.1.x"             "" ""	""	"document"	""
\Format lyx22x     22.lyx "LyX 2.2.x"             "" ""	""	"document"	""
\Format lyx23x     23.lyx "LyX 2.3.x"             "" ""	""	"document,menu=export"	""
\Format clyx       cjklyx "CJK LyX 1.4.x (big5)"  "" ""	""	"document"	""
\Format jlyx       cjklyx "CJK LyX 1.4.x (euc-jp)" "" ""	""	"document"	""
\Format klyx       cjklyx "CJK LyX 1.4.x (euc-kr)" "" ""	""	"document"	""
\Format lyxpreview lyxpreview "LyX Preview"       "" ""	""	""	""
\Format pdftex     "pdftex_t, pdf_tex" PDFTEX                "" ""	""	""	""
\Format program    ""      Program                "" ""	""	""	""
\Format pstex      "pstex_t, ps_tex" PSTEX                  "" ""	""	""	""
\Format wmf        wmf    "Windows Metafile"      "" ""	""	"vector"	"image/x-wmf"
\Format emf        emf    "Enhanced Metafile"     "" ""	""	"vector"	"image/x-emf"
\Format wordhtml  "html, htm" "HTML (MS Word)"    "" "" ""	"document"	""
''')


def checkConverterEntries():
    ''' Check all converters (\converter entries) '''
    checkProg('the pdflatex program', ['pdflatex $$i'],
        rc_entry = [ r'\converter pdflatex   pdf2       "%%"	"latex=pdflatex,hyperref-driver=pdftex"' ])

    checkProg('XeTeX', ['xelatex $$i'],
        rc_entry = [ r'\converter xetex      pdf4       "%%"	"latex=xelatex,hyperref-driver=xetex"' ])

    checkLuatex()

    # Look for tex2lyx in this order (see bugs #3308 and #6986):
    #   1)  If we're building LyX with autotools then tex2lyx is found
    #       in the subdirectory tex2lyx with respect to the binary dir.
    #   2)  If we're building LyX with cmake then tex2lyx is found
    #       in the binary dir.
    #   3)  If LyX was configured with a version suffix then tex2lyx
    #       will also have this version suffix.
    #   4)  Otherwise always use tex2lyx.
    in_binary_subdir = os.path.join(lyx_binary_dir, 'tex2lyx', 'tex2lyx')
    in_binary_subdir = os.path.abspath(in_binary_subdir).replace('\\', '/')

    in_binary_dir = os.path.join(lyx_binary_dir, 'tex2lyx')
    in_binary_dir = os.path.abspath(in_binary_dir).replace('\\', '/')

    path, t2l = checkProg('a LaTeX/Noweb -> LyX converter', [quoteIfSpace(in_binary_subdir), quoteIfSpace(in_binary_subdir + version_suffix), quoteIfSpace(in_binary_dir), quoteIfSpace(in_binary_dir + version_suffix), 'tex2lyx' + version_suffix, 'tex2lyx'],
        rc_entry = [r'''\converter latex      lyx        "%% -f $$i $$o"	""
\converter latexclipboard lyx        "%% -fixedenc utf8 -f $$i $$o"	""
\converter literate   lyx        "%% -n -m noweb -f $$i $$o"	""
\converter sweave   lyx        "%% -n -m sweave -f $$i $$o"	""
\converter knitr   lyx        "%% -n -m knitr -f $$i $$o"	""'''], not_found = 'tex2lyx')
    if path == '':
        logger.warning("Failed to find tex2lyx on your system.")

    #
    checkProg('a Noweb -> LaTeX converter', ['noweave -delay -index $$i > $$o'],
        rc_entry = [r'''\converter literate   latex      "%%"	""
\converter literate   pdflatex      "%%"	""
\converter literate   xetex         "%%"	""
\converter literate   luatex        "%%"	""
\converter literate   dviluatex     "%%"	""'''])
    #
    checkProg('a Sweave -> LaTeX converter', ['Rscript --verbose --no-save --no-restore $$s/scripts/lyxsweave.R $$p$$i $$p$$o $$e $$r'],
        rc_entry = [r'''\converter sweave   latex      "%%"	"needauth"
\converter sweave   pdflatex   "%%"	"needauth"
\converter sweave-ja   platex     "%%"	"needauth"
\converter sweave   xetex      "%%"	"needauth"
\converter sweave   luatex     "%%"	"needauth"
\converter sweave   dviluatex  "%%"	"needauth"'''])
    #
    checkProg('a knitr -> LaTeX converter', ['Rscript --verbose --no-save --no-restore $$s/scripts/lyxknitr.R $$p$$i $$p$$o $$e $$r'],
        rc_entry = [r'''\converter knitr   latex      "%%"	"needauth"
\converter knitr   pdflatex   "%%"	"needauth"
\converter knitr-ja   platex     "%%"	"needauth"
\converter knitr   xetex      "%%"	"needauth"
\converter knitr   luatex     "%%"	"needauth"
\converter knitr   dviluatex  "%%"	"needauth"'''])
    #
    checkProg('a Sweave -> R/S code converter', ['Rscript --verbose --no-save --no-restore $$s/scripts/lyxstangle.R $$i $$e $$r'],
        rc_entry = [ r'\converter sweave      r      "%%"    ""',
                     r'\converter sweave-ja   r      "%%"    ""' ])
    #
    checkProg('a knitr -> R/S code converter', ['Rscript --verbose --no-save --no-restore $$s/scripts/lyxknitr.R $$p$$i $$p$$o $$e $$r tangle'],
        rc_entry = [ r'\converter knitr      r      "%%"    ""',
                     r'\converter knitr-ja   r      "%%"    ""' ])
    #
    checkProg('an HTML -> LaTeX converter', ['html2latex $$i', 'gnuhtml2latex',
        'htmltolatex -input $$i -output $$o', 'htmltolatex.jar -input $$i -output $$o'],
        rc_entry = [ r'\converter html       latex      "%%"	""',
                     r'\converter html       latex      "python -tt $$s/scripts/html2latexwrapper.py %% $$i $$o"	""',
                     r'\converter html       latex      "%%"	""',
                     r'\converter html       latex      "%%"	""', '' ])
    #
    checkProg('an MS Word -> LaTeX converter', ['wvCleanLatex $$i $$o'],
        rc_entry = [ r'\converter word       latex      "%%"	""' ])

    # eLyXer: search as an executable (elyxer.py, elyxer)
    path, elyxer = checkProg('a LyX -> HTML converter',
        ['elyxer.py --nofooter --directory $$r $$i $$o', 'elyxer --nofooter --directory $$r $$i $$o'],
        rc_entry = [ r'\converter lyx      html       "%%"	""' ])
    path, elyxer = checkProg('a LyX -> HTML (MS Word) converter',
        ['elyxer.py --nofooter --html --directory $$r $$i $$o', 'elyxer --nofooter --html --directory $$r $$i $$o'],
        rc_entry = [ r'\converter lyx      wordhtml       "%%"	""' ])
    path, elyxer = checkProg('a LyX -> OpenDocument (eLyXer) converter',
        ['elyxer.py --html --nofooter --unicode --directory $$r $$i $$o', 'elyxer --html --nofooter --unicode --directory $$r $$i $$o'],
        rc_entry = [ r'\converter lyx      odt2       "%%"	""' ])
    path, elyxer = checkProg('a LyX -> Word converter',
        ['elyxer.py --html --nofooter --unicode --directory $$r $$i $$o', 'elyxer --html --nofooter --unicode --directory $$r $$i $$o'],
        rc_entry = [ r'\converter lyx      word      "%%"	""' ])
    if elyxer.find('elyxer') >= 0:
      addToRC(r'''\copier    html       "python -tt $$s/scripts/ext_copy.py -e html,png,jpg,jpeg,css $$i $$o"''')
      addToRC(r'''\copier    wordhtml       "python -tt $$s/scripts/ext_copy.py -e html,png,jpg,jpeg,css $$i $$o"''')
    else:
      # search for HTML converters other than eLyXer
      # On SuSE the scripts have a .sh suffix, and on debian they are in /usr/share/tex4ht/
      path, htmlconv = checkProg('a LaTeX -> HTML converter', ['htlatex $$i', 'htlatex.sh $$i',
          '/usr/share/tex4ht/htlatex $$i', 'tth  -t -e2 -L$$b < $$i > $$o',
          'latex2html -no_subdir -split 0 -show_section_numbers $$i', 'hevea -s $$i'],
          rc_entry = [ r'\converter latex      html       "%%"	"needaux"' ])
      if htmlconv.find('htlatex') >= 0 or htmlconv == 'latex2html':
        addToRC(r'''\copier    html       "python -tt $$s/scripts/ext_copy.py -e html,png,css $$i $$o"''')
      else:
        addToRC(r'''\copier    html       "python -tt $$s/scripts/ext_copy.py $$i $$o"''')
      path, htmlconv = checkProg('a LaTeX -> HTML (MS Word) converter', ["htlatex $$i 'html,word' 'symbol/!' '-cvalidate'",
          "htlatex.sh $$i 'html,word' 'symbol/!' '-cvalidate'",
          "/usr/share/tex4ht/htlatex $$i 'html,word' 'symbol/!' '-cvalidate'"],
          rc_entry = [ r'\converter latex      wordhtml   "%%"	"needaux"' ])
      if htmlconv.find('htlatex') >= 0:
        addToRC(r'''\copier    wordhtml       "python -tt $$s/scripts/ext_copy.py -e html,png,css $$i $$o"''')
      else:
        addToRC(r'''\copier    wordhtml       "python -tt $$s/scripts/ext_copy.py $$i $$o"''')


    # Check if LyXBlogger is installed
    lyxblogger_found = checkModule('lyxblogger')
    if lyxblogger_found:
      addToRC(r'\Format    blog       blog       "LyXBlogger"           "" "" ""  "document"  ""')
      addToRC(r'\converter xhtml      blog       "python -m lyxblogger $$i"       ""')

    #
    checkProg('an OpenOffice.org -> LaTeX converter', ['w2l -clean $$i'],
        rc_entry = [ r'\converter sxw        latex      "%%"	""' ])
    #
    checkProg('an OpenDocument -> LaTeX converter', ['w2l -clean $$i'],
        rc_entry = [ r'\converter odt        latex      "%%"	""' ])
    #
    checkProg('an Open Document (Pandoc) -> LaTeX converter', ['pandoc -s -f odt -o $$o -t latex $$i'],
        rc_entry = [ r'\converter odt3        latex      "%%"	""' ])
    #
    checkProg('a MS Word Office Open XML converter -> LaTeX', ['pandoc -s -f docx -o $$o -t latex $$i'],
        rc_entry = [ r'\converter word2      latex      "%%"	""' ])
    # Only define a converter to pdf6, otherwise the odt format could be
    # used as an intermediate step for export to pdf, which is not wanted.
    checkProg('an OpenDocument -> PDF converter', ['unoconv -f pdf --stdout $$i > $$o'],
        rc_entry = [ r'\converter odt        pdf6       "%%"	""' ])
    # According to http://www.tug.org/applications/tex4ht/mn-commands.html
    # the command mk4ht oolatex $$i has to be used as default,
    # but as this would require to have Perl installed, in MiKTeX oolatex is
    # directly available as application.
    # On SuSE the scripts have a .sh suffix, and on debian they are in /usr/share/tex4ht/
    # Both SuSE and debian have oolatex
    checkProg('a LaTeX -> Open Document (tex4ht) converter', [
        'oolatex $$i', 'mk4ht oolatex $$i', 'oolatex.sh $$i', '/usr/share/tex4ht/oolatex $$i',
        'htlatex $$i \'xhtml,ooffice\' \'ooffice/! -cmozhtf\' \'-coo\' \'-cvalidate\''],
        rc_entry = [ r'\converter latex      odt        "%%"	"needaux"' ])
    # On windows it is called latex2rt.exe
    checkProg('a LaTeX -> RTF converter', ['latex2rtf -p -S -o $$o $$i', 'latex2rt -p -S -o $$o $$i'],
        rc_entry = [ r'\converter latex      rtf        "%%"	"needaux"' ])
    #
    checkProg('a LaTeX -> Open Document (Pandoc) converter', ['pandoc -s -f latex -o $$o -t odt $$i'],
        rc_entry = [ r'\converter latex      odt3        "%%"	""' ])
    #
    checkProg('a LaTeX -> MS Word Office Open XML converter', ['pandoc -s -f latex -o $$o -t docx $$i'],
        rc_entry = [ r'\converter latex      word2       "%%"	""' ])
    #
    checkProg('a RTF -> HTML converter', ['unrtf --html  $$i > $$o'],
        rc_entry = [ r'\converter rtf      html        "%%"	""' ])
    # Do not define a converter to pdf6, ps is a pure export format
    checkProg('a PS to PDF converter', ['ps2pdf $$i $$o'],
        rc_entry = [ r'\converter ps         pdf        "%%"	"hyperref-driver=dvips"' ])
    #
    checkProg('a PS to TXT converter', ['pstotext $$i > $$o'],
        rc_entry = [ r'\converter ps         text2      "%%"	""' ])
    #
    checkProg('a PS to TXT converter', ['ps2ascii $$i $$o'],
        rc_entry = [ r'\converter ps         text3      "%%"	""' ])
    # Need to call ps2eps in a pipe, otherwise it would name the output file
    # depending on the extension of the input file. We do not know the input
    # file extension in general, so the resultfile= flag would not help.
    # Since ps2eps crops the image, we do not use it to convert from ps->eps.
    # This would create additional paths in the converter graph with unwanted
    # side effects (e.g. ps->pdf via ps2pdf would create a different result
    # than ps->eps->pdf via ps2eps and epstopdf).
    checkProg('a PS to EPS converter', ['ps2eps -- < $$i > $$o'],
        rc_entry = [ r'\converter eps2       eps      "%%"	""' ])
    #
    checkProg('a PDF to PS converter', ['pdftops $$i $$o', 'pdf2ps $$i $$o'],
        rc_entry = [ r'\converter pdf         ps        "%%"	""' ])
    # Only define a converter from pdf6 for graphics
    checkProg('a PDF to EPS converter', ['pdftops -eps -f 1 -l 1 $$i $$o'],
        rc_entry = [ r'\converter pdf6        eps        "%%"	""' ])
    # Define a converter from pdf6 to png for Macs where pdftops is missing.
    # The converter utility sips allows to force the dimensions of the resulting
    # png image. The value of 800 pixel for the width is arbitrary and not
    # related to the current screen resolution or width.
    # There is no converter parameter for this information.
    checkProg('a PDF to PNG converter',
        ['sips --resampleWidth 800 --setProperty format png $$i --out $$o'],
        rc_entry = [ r'\converter pdf6        png        "%%" ""' ])
    # Create one converter for a PDF produced using TeX fonts and one for a
    # PDF produced using non-TeX fonts. This does not produce non-unique
    # conversion paths, since a given document either uses TeX fonts or not.
    checkProg('a PDF cropping tool', ['pdfcrop $$i $$o'],
        rc_entry = [ r'''\converter pdf2   pdf7       "%%"	""
\converter pdf4   pdf7       "%%"	""''' ])
    # Create one converter for a PDF produced using TeX fonts and one for a
    # PDF produced using non-TeX fonts. This does not produce non-unique
    # conversion paths, since a given document either uses TeX fonts or not.
    checkProg('Ghostscript', ["gswin32c", "gswin64c", "gs"],
        rc_entry = [ r'''\converter pdf2   pdf8       "python -tt $$s/scripts/convert_pdf.py $$i $$o ebook"	""
\converter pdf4   pdf8       "python -tt $$s/scripts/convert_pdf.py $$i $$o ebook"	""''' ])
    #
    checkProg('a Beamer info extractor', ['makebeamerinfo -p $$i'],
        rc_entry = [ r'\converter pdf2         beamer.info        "%%"	""' ])
    #
    checkProg('a DVI to TXT converter', ['catdvi $$i > $$o'],
        rc_entry = [ r'\converter dvi        text4      "%%"	""' ])
    #
    checkProg('a DVI to PS converter', ['dvips -o $$o $$i'],
        rc_entry = [ r'\converter dvi        ps         "%%"	"hyperref-driver=dvips"' ])
    #
    checkProg('a DVI to cropped EPS converter', ['dvips -E -o $$o $$i'],
        rc_entry = [ r'\converter dvi        eps3         "%%"	""' ])
    #
    checkProg('a DVI to PDF converter', ['dvipdfmx', 'dvipdfm'],
        rc_entry = [ r'\converter dvi        pdf3       "%%  -o $$o $$i"	"hyperref-driver=%%"' ])
    #
    checkProg('a fax program', ['kdeprintfax $$i', 'ksendfax $$i', 'hylapex $$i'],
        rc_entry = [ r'\converter ps         fax        "%%"	""'])
    #
    path, fig2dev = checkProg('a FIG -> Image converter', ['fig2dev'])
    if fig2dev == "fig2dev":
        addToRC(r'''\converter fig        eps        "fig2dev -L eps $$i $$o"	""
\converter fig        ppm        "fig2dev -L ppm $$i $$o"	""
\converter fig        svg        "fig2dev -L svg $$i $$o"	""
\converter fig        png        "fig2dev -L png $$i $$o"	""
\converter fig        pdftex     "python -tt $$s/scripts/fig2pdftex.py $$i $$o"	""
\converter fig        pstex      "python -tt $$s/scripts/fig2pstex.py $$i $$o"	""''')
    #
    checkProg('a SVG -> PDFTeX converter', [inkscape_cl],
        rc_entry = [ r'\converter svg        pdftex     "python -tt $$s/scripts/svg2pdftex.py %% $$p$$i $$p$$o" ""'],
        path = [inkscape_path])
    #
    checkProg('a SVG -> PSTeX converter', [inkscape_cl],
        rc_entry = [ r'\converter svg        pstex     "python -tt $$s/scripts/svg2pstex.py %% $$p$$i $$p$$o" ""'],
        path = [inkscape_path])
    #
    checkProg('a TIFF -> PS converter', ['tiff2ps $$i > $$o'],
        rc_entry = [ r'\converter tiff       eps        "%%"	""'])
    #
    checkProg('a TGIF -> EPS/PPM converter', ['tgif'],
        rc_entry = [
            r'''\converter tgif       eps        "tgif -print -color -eps -stdout $$i > $$o"	""
\converter tgif       png        "tgif -print -color -png -o $$d $$i"	""
\converter tgif       pdf6       "tgif -print -color -pdf -stdout $$i > $$o"	""'''])
    #
    checkProg('a WMF -> EPS converter', ['metafile2eps $$i $$o', 'wmf2eps -o $$o $$i', inkscape_cl + ' --file=%s$$i --export-area-drawing --without-gui --export-eps=%s$$o'
               % (inkscape_fileprefix, inkscape_fileprefix)],
        rc_entry = [ r'\converter wmf        eps        "%%"	""'])
    #
    checkProg('an EMF -> EPS converter', ['metafile2eps $$i $$o', inkscape_cl + ' --file=%s$$i --export-area-drawing --without-gui --export-eps=%s$$o'
               % (inkscape_fileprefix, inkscape_fileprefix)],
        rc_entry = [ r'\converter emf        eps        "%%"	""'])
    #
    checkProg('a WMF -> PDF converter', [inkscape_cl + ' --file=%s$$i --export-area-drawing --without-gui --export-pdf=%s$$o' % (inkscape_fileprefix, inkscape_fileprefix)],
        rc_entry = [ r'\converter wmf        pdf6        "%%"	""'])
    #
    checkProg('an EMF -> PDF converter', [inkscape_cl + ' --file=%s$$i --export-area-drawing --without-gui --export-pdf=%s$$o' % (inkscape_fileprefix, inkscape_fileprefix)],
        rc_entry = [ r'\converter emf        pdf6        "%%"	""'])
    # Only define a converter to pdf6 for graphics
    checkProg('an EPS -> PDF converter', ['epstopdf'],
        rc_entry = [ r'\converter eps        pdf6       "epstopdf --outfile=$$o $$i"	""'])
    #
    checkProg('an EPS -> PNG converter', ['magick $$i $$o', 'convert $$i $$o'],
        rc_entry = [ r'\converter eps        png        "%%"	""'])
    #
    # no agr -> pdf6 converter, since the pdf library used by gracebat is not
    # free software and therefore not compiled in in many installations.
    # Fortunately, this is not a big problem, because we will use epstopdf to
    # convert from agr to pdf6 via eps without loss of quality.
    checkProg('a Grace -> Image converter', ['gracebat'],
        rc_entry = [
            r'''\converter agr        eps        "gracebat -hardcopy -printfile $$o -hdevice EPS $$i 2>/dev/null"	""
\converter agr        png        "gracebat -hardcopy -printfile $$o -hdevice PNG $$i 2>/dev/null"	""
\converter agr        jpg        "gracebat -hardcopy -printfile $$o -hdevice JPEG $$i 2>/dev/null"	""
\converter agr        ppm        "gracebat -hardcopy -printfile $$o -hdevice PNM $$i 2>/dev/null"	""'''])
    #
    checkProg('a Dot -> Image converter', ['dot'],
        rc_entry = [
            r'''\converter dot        eps        "dot -Teps $$i -o $$o"	""
\converter dot        png        "dot -Tpng $$i -o $$o"	""'''])
    #
    path, dia = checkProg('a Dia -> Image converter', ['dia'])
    if dia == 'dia':
        addToRC(r'''\converter dia        png        "dia -e $$o -t png $$i"	""
\converter dia        eps        "dia -e $$o -t eps $$i"	""
\converter dia        svg        "dia -e $$o -t svg $$i"	""''')

    #
    # Actually, this produces EPS, but with a wrong bounding box (usually A4 or letter).
    # The eps2->eps converter then fixes the bounding box by cropping.
    # Although unoconv can convert to png and pdf as well, do not define
    # odg->png and odg->pdf converters, since the bb would be too large as well.
    checkProg('an OpenDocument -> EPS converter', ['libreoffice --headless --nologo --convert-to eps $$i', 'unoconv -f eps --stdout $$i > $$o'],
        rc_entry = [ r'\converter odg        eps2       "%%"	""'])
    #
    checkProg('a SVG (compressed) -> SVG converter', ['gunzip -c $$i > $$o'],
        rc_entry = [ r'\converter svgz       svg        "%%"	""'])
    #
    checkProg('a SVG -> SVG (compressed) converter', ['gzip -c $$i > $$o'],
        rc_entry = [ r'\converter svg        svgz       "%%"	""'])
    # Only define a converter to pdf6 for graphics
    # Prefer rsvg-convert over inkscape since it is faster (see http://www.lyx.org/trac/ticket/9891)
    checkProg('a SVG -> PDF converter', ['rsvg-convert -f pdf -o $$o $$i', inkscape_cl + ' --file=%s$$i --export-area-drawing --without-gui --export-pdf=%s$$o'
               % (inkscape_fileprefix, inkscape_fileprefix)],
        rc_entry = [ r'''\converter svg        pdf6       "%%"    ""
\converter svgz       pdf6       "%%"    ""'''],
        path = ['', inkscape_path])
    #
    checkProg('a SVG -> EPS converter', ['rsvg-convert -f ps -o $$o $$i', inkscape_cl + ' --file=%s$$i --export-area-drawing --without-gui --export-eps=%s$$o'
               % (inkscape_fileprefix, inkscape_fileprefix)],
        rc_entry = [ r'''\converter svg        eps        "%%"    ""
\converter svgz       eps        "%%"    ""'''],
        path = ['', inkscape_path])
    #
    checkProg('a SVG -> PNG converter', ['rsvg-convert -f png -o $$o $$i', inkscape_cl + ' --without-gui --file=%s$$i --export-png=%s$$o'
               % (inkscape_fileprefix, inkscape_fileprefix)],
        rc_entry = [ r'''\converter svg        png        "%%"    "",
\converter svgz       png        "%%"    ""'''],
        path = ['', inkscape_path])
    #
    checkProg('Gnuplot', ['gnuplot'], 
        rc_entry = [ r'''\Format gnuplot     "gp, gnuplot"    "Gnuplot"     "" "" ""  "vector"	"text/plain"
\converter gnuplot      pdf6      "python -tt $$s/scripts/gnuplot2pdf.py $$i $$o"    "needauth"''' ])
    #
    # gnumeric/xls/ods to tex
    checkProg('a spreadsheet -> latex converter', ['ssconvert'],
       rc_entry = [ r'''\converter gnumeric latex "ssconvert --export-type=Gnumeric_html:latex $$i $$o" ""
\converter oocalc latex "ssconvert --export-type=Gnumeric_html:latex $$i $$o" ""
\converter excel  latex "ssconvert --export-type=Gnumeric_html:latex $$i $$o" ""
\converter excel2 latex "ssconvert --export-type=Gnumeric_html:latex $$i $$o" ""
\converter gnumeric html_table "ssconvert --export-type=Gnumeric_html:html40frag $$i $$o" ""
\converter oocalc html_table "ssconvert --export-type=Gnumeric_html:html40frag $$i $$o" ""
\converter excel  html_table "ssconvert --export-type=Gnumeric_html:html40frag $$i $$o" ""
\converter excel2 html_table "ssconvert --export-type=Gnumeric_html:html40frag $$i $$o" ""
'''])

    path, lilypond = checkProg('a LilyPond -> EPS/PDF/PNG converter', ['lilypond'])
    if (lilypond != ''):
        version_string = cmdOutput("lilypond --version")
        match = re.match('GNU LilyPond (\S+)', version_string)
        if match:
            version_number = match.groups()[0]
            version = version_number.split('.')
            if int(version[0]) > 2 or (len(version) > 1 and int(version[0]) == 2 and int(version[1]) >= 11):
                addToRC(r'''\converter lilypond   eps        "lilypond -dbackend=eps -dsafe --ps $$i"	""
\converter lilypond   png        "lilypond -dbackend=eps -dsafe --png $$i"	""''')
                addToRC(r'\converter lilypond   pdf6       "lilypond -dbackend=eps -dsafe --pdf $$i"	""')
                logger.info('+  found LilyPond version %s.' % version_number)
            elif int(version[0]) > 2 or (len(version) > 1 and int(version[0]) == 2 and int(version[1]) >= 6):
                addToRC(r'''\converter lilypond   eps        "lilypond -b eps --ps --safe $$i"	""
\converter lilypond   png        "lilypond -b eps --png $$i"	""''')
                if int(version[0]) > 2 or (len(version) > 1 and int(version[0]) == 2 and int(version[1]) >= 9):
                    addToRC(r'\converter lilypond   pdf6       "lilypond -b eps --pdf --safe $$i"	""')
                logger.info('+  found LilyPond version %s.' % version_number)
            else:
                logger.info('+  found LilyPond, but version %s is too old.' % version_number)
        else:
            logger.info('+  found LilyPond, but could not extract version number.')
    #
    path, lilypond_book = checkProg('a LilyPond book (LaTeX) -> LaTeX converter', ['lilypond-book'])
    if (lilypond_book != ''):
        version_string = cmdOutput("lilypond-book --version")
        match = re.match('(\S+)$', version_string)
        if match:
            version_number = match.groups()[0]
            version = version_number.split('.')
            if int(version[0]) > 2 or (len(version) > 1 and int(version[0]) == 2 and int(version[1]) >= 13):
                # Note: The --lily-output-dir flag is required because lilypond-book
                #       does not process input again unless the input has changed,
                #       even if the output format being requested is different. So
                #       once a .eps file exists, lilypond-book won't create a .pdf
                #       even when requested with --pdf. This is a problem if a user
                #       clicks View PDF after having done a View DVI. To circumvent
                #       this, use different output folders for eps and pdf outputs.
                addToRC(r'\converter lilypond-book latex    "lilypond-book --safe --lily-output-dir=ly-eps $$i"                                ""')
                addToRC(r'\converter lilypond-book pdflatex "lilypond-book --safe --pdf --latex-program=pdflatex --lily-output-dir=ly-pdf $$i" ""')
                addToRC(r'\converter lilypond-book-ja platex "lilypond-book --safe --pdf --latex-program=platex --lily-output-dir=ly-pdf $$i" ""')
                addToRC(r'\converter lilypond-book xetex    "lilypond-book --safe --pdf --latex-program=xelatex --lily-output-dir=ly-pdf $$i"  ""')
                addToRC(r'\converter lilypond-book luatex   "lilypond-book --safe --pdf --latex-program=lualatex --lily-output-dir=ly-pdf $$i" ""')
                addToRC(r'\converter lilypond-book dviluatex "lilypond-book --safe --latex-program=dvilualatex --lily-output-dir=ly-eps $$i" ""')
                logger.info('+  found LilyPond-book version %s.' % version_number)
            else:
                logger.info('+  found LilyPond-book, but version %s is too old.' % version_number)
        else:
            logger.info('+  found LilyPond-book, but could not extract version number.')
    #
    checkProg('a Noteedit -> LilyPond converter', ['noteedit --export-lilypond $$i'],
        rc_entry = [ r'\converter noteedit   lilypond   "%%"	""' ])
    #
    # Currently, lyxpak outputs a gzip compressed tar archive on *nix
    # and a zip archive on Windows.
    # So, we configure the appropriate version according to the platform.
    cmd = r'\converter lyx %s "python -tt $$s/scripts/lyxpak.py $$r/$$f" ""'
    if os.name == 'nt':
        addToRC(r'\Format lyxzip     zip    "LyX Archive (zip)"     "" "" ""  "document,menu=export"	""')
        addToRC(cmd % "lyxzip")
    else:
        addToRC(r'\Format lyxgz      gz     "LyX Archive (tar.gz)"  "" "" ""  "document,menu=export"	""')
        addToRC(cmd % "lyxgz")

    #
    # FIXME: no rc_entry? comment it out
    # checkProg('Image converter', ['convert $$i $$o'])
    #
    # Entries that do not need checkProg
    addToRC(r'''
\converter csv        lyx        "python -tt $$s/scripts/csv2lyx.py $$i $$o"	""
\converter docbook    docbook-xml "cp $$i $$o"	"xml"
\converter fen        asciichess "python -tt $$s/scripts/fen2ascii.py $$i $$o"	""
\converter lyx        lyx13x     "python -tt $$s/lyx2lyx/lyx2lyx -V 1.3 -o $$o $$i"	""
\converter lyx        lyx14x     "python -tt $$s/lyx2lyx/lyx2lyx -V 1.4 -o $$o $$i"	""
\converter lyx        lyx15x     "python -tt $$s/lyx2lyx/lyx2lyx -V 1.5 -o $$o $$i"	""
\converter lyx        lyx16x     "python -tt $$s/lyx2lyx/lyx2lyx -V 1.6 -o $$o $$i"	""
\converter lyx        lyx20x     "python -tt $$s/lyx2lyx/lyx2lyx -V 2.0 -o $$o $$i"	""
\converter lyx        lyx21x     "python -tt $$s/lyx2lyx/lyx2lyx -V 2.1 -o $$o $$i"	""
\converter lyx        lyx22x     "python -tt $$s/lyx2lyx/lyx2lyx -V 2.2 -o $$o $$i"	""
\converter lyx        lyx23x     "python -tt $$s/lyx2lyx/lyx2lyx -V 2.3 -o $$o $$i"	""
\converter lyx        clyx       "python -tt $$s/lyx2lyx/lyx2lyx -V 1.4 -o $$o -c big5   $$i"	""
\converter lyx        jlyx       "python -tt $$s/lyx2lyx/lyx2lyx -V 1.4 -o $$o -c euc_jp $$i"	""
\converter lyx        klyx       "python -tt $$s/lyx2lyx/lyx2lyx -V 1.4 -o $$o -c euc_kr $$i"	""
\converter clyx       lyx        "python -tt $$s/lyx2lyx/lyx2lyx -c big5   -o $$o $$i"	""
\converter jlyx       lyx        "python -tt $$s/lyx2lyx/lyx2lyx -c euc_jp -o $$o $$i"	""
\converter klyx       lyx        "python -tt $$s/lyx2lyx/lyx2lyx -c euc_kr -o $$o $$i"	""
\converter lyxpreview png        "python -tt $$s/scripts/lyxpreview2bitmap.py --png"	""
\converter lyxpreview ppm        "python -tt $$s/scripts/lyxpreview2bitmap.py --ppm"	""
''')


def checkDocBook():
    ''' Check docbook '''
    path, DOCBOOK = checkProg('SGML-tools 2.x (DocBook), db2x scripts or xsltproc', ['sgmltools', 'db2dvi', 'xsltproc'],
        rc_entry = [
            r'''\converter docbook    dvi        "sgmltools -b dvi $$i"	""
\converter docbook    html       "sgmltools -b html $$i"	""
\converter docbook    ps         "sgmltools -b ps $$i"	""''',
            r'''\converter docbook    dvi        "db2dvi $$i"	""
\converter docbook    html       "db2html $$i"	""''',
            r'''\converter docbook    dvi        ""	""
\converter docbook    html       "" ""''',
            r'''\converter docbook    dvi        ""	""
\converter docbook    html       ""	""'''])
    #
    if DOCBOOK != '':
        return ('yes', 'true', '\\def\\hasdocbook{yes}')
    else:
        return ('no', 'false', '')


def checkOtherEntries():
    ''' entries other than Format and Converter '''
    checkProg('ChkTeX', ['chktex -n1 -n3 -n6 -n9 -n22 -n25 -n30 -n38'],
        rc_entry = [ r'\chktex_command "%%"' ])
    checkProgAlternatives('BibTeX or alternative programs',
        ['bibtex', 'bibtex8', 'biber'],
        rc_entry = [ r'\bibtex_command "automatic"' ],
        alt_rc_entry = [ r'\bibtex_alternatives "%%"' ])
    checkProgAlternatives('a specific Japanese BibTeX variant',
        ['pbibtex', 'upbibtex', 'jbibtex', 'bibtex', 'biber'],
        rc_entry = [ r'\jbibtex_command "automatic"' ],
        alt_rc_entry = [ r'\jbibtex_alternatives "%%"' ])
    checkProgAlternatives('available index processors',
        ['texindy', 'makeindex -c -q', 'xindy'],
        rc_entry = [ r'\index_command "%%"' ],
        alt_rc_entry = [ r'\index_alternatives "%%"' ])
    checkProg('an index processor appropriate to Japanese',
        ['mendex -c -q', 'jmakeindex -c -q', 'makeindex -c -q'],
        rc_entry = [ r'\jindex_command "%%"' ])
    checkProg('the splitindex processor', ['splitindex.pl', 'splitindex',
        'splitindex.class'], rc_entry = [ r'\splitindex_command "%%"' ])
    checkProg('a nomenclature processor', ['makeindex'],
        rc_entry = [ r'\nomencl_command "makeindex -s nomencl.ist"' ])
    checkProg('a python-pygments driver command', ['pygmentize'],
        rc_entry = [ r'\pygmentize_command "%%"' ])
    ## FIXME: OCTAVE is not used anywhere
    # path, OCTAVE = checkProg('Octave', ['octave'])
    ## FIXME: MAPLE is not used anywhere
    # path, MAPLE = checkProg('Maple', ['maple'])
    # Add the rest of the entries (no checkProg is required)
    addToRC(r'''\copier    fig        "python -tt $$s/scripts/fig_copy.py $$i $$o"
\copier    pstex      "python -tt $$s/scripts/tex_copy.py $$i $$o $$l"
\copier    pdftex     "python -tt $$s/scripts/tex_copy.py $$i $$o $$l"
\copier    program    "python -tt $$s/scripts/ext_copy.py $$i $$o"
''')


def processLayoutFile(file, bool_docbook):
    ''' process layout file and get a line of result

        Declare lines look like this:

        \DeclareLaTeXClass[<requirements>]{<description>}

        Optionally, a \DeclareCategory line follows:

        \DeclareCategory{<category>}

        So for example (article.layout, scrbook.layout, svjog.layout)

        \DeclareLaTeXClass{article}
        \DeclareCategory{Articles}

        \DeclareLaTeXClass[scrbook]{book (koma-script)}
        \DeclareCategory{Books}

        \DeclareLaTeXClass[svjour,svjog.clo]{article (Springer - svjour/jog)}

        we'd expect this output:

        "article" "article" "article" "false" "article.cls" "Articles"
        "scrbook" "scrbook" "book (koma-script)" "false" "scrbook.cls" "Books"
        "svjog" "svjour" "article (Springer - svjour/jog)" "false" "svjour.cls,svjog.clo" ""
    '''
    def checkForClassExtension(x):
        '''if the extension for a latex class is not
           provided, add .cls to the classname'''
        if not b'.' in x:
            return x.strip() + b'.cls'
        else:
            return x.strip()
    classname = file.split(os.sep)[-1].split('.')[0]
    # return ('LaTeX', '[a,b]', 'a', ',b,c', 'article') for \DeclareLaTeXClass[a,b,c]{article}
    p = re.compile(b'\s*#\s*\\\\Declare(LaTeX|DocBook)Class\s*(\[([^,]*)(,.*)*\])*\s*{(.*)}\s*$')
    q = re.compile(b'\s*#\s*\\\\DeclareCategory{(.*)}\s*$')
    classdeclaration = b""
    categorydeclaration = b'""'
    for line in open(file, 'rb').readlines():
        res = p.match(line)
        qres = q.match(line)
        if res != None:
            (classtype, optAll, opt, opt1, desc) = res.groups()
            avai = {b'LaTeX':b'false', b'DocBook':bool_docbook.encode('ascii')}[classtype]
            if opt == None:
                opt = classname.encode('ascii')
                prereq_latex = checkForClassExtension(classname.encode('ascii'))
            else:
                prereq_list = optAll[1:-1].split(b',')
                prereq_list = list(map(checkForClassExtension, prereq_list))
                prereq_latex = b','.join(prereq_list)
            prereq_docbook = {'true':b'', 'false':b'docbook'}[bool_docbook]
            prereq = {b'LaTeX':prereq_latex, b'DocBook':prereq_docbook}[classtype]
            classdeclaration = (b'"%s" "%s" "%s" "%s" "%s"'
                               % (classname, opt, desc, avai, prereq))
            if categorydeclaration != b'""':
                return classdeclaration + b" " + categorydeclaration
        if qres != None:
             categorydeclaration = b'"%s"' % (qres.groups()[0])
             if classdeclaration != b"":
                 return classdeclaration + b" " + categorydeclaration
    if classdeclaration != b"":
        return classdeclaration + b" " + categorydeclaration
    logger.warning("Layout file " + file + " has no \DeclareXXClass line. ")
    return b""


def checkLatexConfig(check_config, bool_docbook):
    ''' Explore the LaTeX configuration
        Return None (will be passed to sys.exit()) for success.
    '''
    msg = 'checking LaTeX configuration... '
    # if --without-latex-config is forced, or if there is no previous
    # version of textclass.lst, re-generate a default file.
    if not os.path.isfile('textclass.lst') or not check_config:
        # remove the files only if we want to regenerate
        removeFiles(['textclass.lst', 'packages.lst'])
        #
        # Then, generate a default textclass.lst. In case configure.py
        # fails, we still have something to start lyx.
        logger.info(msg + ' default values')
        logger.info('+checking list of textclasses... ')
        tx = open('textclass.lst', 'wb')
        tx.write(b'''
# This file declares layouts and their associated definition files
# (include dir. relative to the place where this file is).
# It contains only default values, since chkconfig.ltx could not be run
# for some reason. Run ./configure.py if you need to update it after a
# configuration change.
''')
        # build the list of available layout files and convert it to commands
        # for chkconfig.ltx
        foundClasses = []
        for file in (glob.glob(os.path.join('layouts', '*.layout'))
                     + glob.glob(os.path.join(srcdir, 'layouts', '*.layout'))):
            # valid file?
            if not os.path.isfile(file):
                continue
            # get stuff between /xxxx.layout .
            classname = file.split(os.sep)[-1].split('.')[0]
            #  tr ' -' '__'`
            cleanclass = classname.replace(' ', '_')
            cleanclass = cleanclass.replace('-', '_')
            # make sure the same class is not considered twice
            if foundClasses.count(cleanclass) == 0: # not found before
                foundClasses.append(cleanclass)
                retval = processLayoutFile(file, bool_docbook)
                if retval != b"":
                    tx.write(retval + os.linesep)
        tx.close()
        logger.info('\tdone')
    if not os.path.isfile('packages.lst') or not check_config:
        logger.info('+generating default list of packages... ')
        removeFiles(['packages.lst'])
        tx = open('packages.lst', 'w')
        tx.close()
        logger.info('\tdone')
    if not check_config:
        return None
    # the following will generate textclass.lst.tmp, and packages.lst.tmp
    logger.info(msg + '\tauto')
    removeFiles(['chkconfig.classes', 'chkconfig.vars', 'chklayouts.tex',
        'wrap_chkconfig.ltx'])
    rmcopy = False
    if not os.path.isfile( 'chkconfig.ltx' ):
        shutil.copyfile( os.path.join(srcdir, 'chkconfig.ltx'), 'chkconfig.ltx' )
        rmcopy = True
    writeToFile('wrap_chkconfig.ltx', '%s\n\\input{chkconfig.ltx}\n' % docbook_cmd)
    # Construct the list of classes to test for.
    # build the list of available layout files and convert it to commands
    # for chkconfig.ltx
    declare = re.compile(b'\\s*#\\s*\\\\Declare(LaTeX|DocBook)Class\\s*(\[([^,]*)(,.*)*\])*\\s*{(.*)}\\s*$')
    category = re.compile(b'\\s*#\\s*\\\\DeclareCategory{(.*)}\\s*$')
    empty = re.compile(b'\\s*$')
    testclasses = list()
    for file in (glob.glob( os.path.join('layouts', '*.layout') )
                 + glob.glob( os.path.join(srcdir, 'layouts', '*.layout' ) ) ):
        nodeclaration = False
        if not os.path.isfile(file):
            continue
        classname = file.split(os.sep)[-1].split('.')[0]
        decline = b""
        catline = b""
        for line in open(file, 'rb').readlines():
            if not empty.match(line) and line[0] != b'#'[0]:
                if decline == b"":
                    logger.warning("Failed to find valid \Declare line "
                        "for layout file `%s'.\n\t=> Skipping this file!" % file)
                    nodeclaration = True
                # A class, but no category declaration. Just break.
                break
            if declare.match(line) != None:
                decline = b"\\TestDocClass{%s}{%s}" \
                           % (classname.encode('ascii'), line[1:].strip())
                testclasses.append(decline)
            elif category.match(line) != None:
                catline = (b"\\DeclareCategory{%s}{%s}"
                           % (classname.encode('ascii'),
                              category.match(line).groups()[0]))
                testclasses.append(catline)
            if catline == b"" or decline == b"":
                continue
            break
        if nodeclaration:
            continue
    testclasses.sort()
    cl = open('chklayouts.tex', 'wb')
    for line in testclasses:
        cl.write(line + b'\n')
    cl.close()
    #
    # we have chklayouts.tex, then process it
    latex_out = cmdOutput(LATEX + ' wrap_chkconfig.ltx', True)
    while True:
        line = latex_out.readline()
        if not line:
            break;
        if line.startswith('+'):
            logger.info(line.strip())
    # if the command succeeds, None will be returned
    ret = latex_out.close()
    #
    # remove the copied file
    if rmcopy:
        removeFiles( [ 'chkconfig.ltx' ] )
    #
    # values in chkconfig were only used to set
    # \font_encoding, which is obsolete
#    values = {}
#    for line in open('chkconfig.vars').readlines():
#        key, val = re.sub('-', '_', line).split('=')
#        val = val.strip()
#        values[key] = val.strip("'")
    # if configure successed, move textclass.lst.tmp to textclass.lst
    # and packages.lst.tmp to packages.lst
    if (os.path.isfile('textclass.lst.tmp')
          and len(open('textclass.lst.tmp').read()) > 0
        and os.path.isfile('packages.lst.tmp')
          and len(open('packages.lst.tmp').read()) > 0):
        shutil.move('textclass.lst.tmp', 'textclass.lst')
        shutil.move('packages.lst.tmp', 'packages.lst')
    return ret


def checkModulesConfig():
  removeFiles(['lyxmodules.lst', 'chkmodules.tex'])

  logger.info('+checking list of modules... ')
  tx = open('lyxmodules.lst', 'wb')
  tx.write(b'''## This file declares modules and their associated definition files.
## It has been automatically generated by configure
## Use "Options/Reconfigure" if you need to update it after a
## configuration change.
## "ModuleName" "filename" "Description" "Packages" "Requires" "Excludes" "Category"
''')

  # build the list of available modules
  seen = []
  # note that this searches the local directory first, then the
  # system directory. that way, we pick up the user's version first.
  for file in (glob.glob( os.path.join('layouts', '*.module') )
               + glob.glob( os.path.join(srcdir, 'layouts', '*.module' ) ) ):
      # valid file?
      logger.info(file)
      if not os.path.isfile(file):
          continue

      filename = file.split(os.sep)[-1]
      filename = filename[:-7]
      if seen.count(filename):
          continue

      seen.append(filename)
      retval = processModuleFile(file, filename.encode('ascii'), bool_docbook)
      if retval != b"":
          tx.write(retval)
  tx.close()
  logger.info('\tdone')


def processModuleFile(file, filename, bool_docbook):
    ''' process module file and get a line of result

        The top of a module file should look like this:
          #\DeclareLyXModule[LaTeX Packages]{ModuleName}
          #DescriptionBegin
          #...body of description...
          #DescriptionEnd
          #Requires: [list of required modules]
          #Excludes: [list of excluded modules]
          #Category: [category name]
        The last three lines are optional (though do give a category).
        We expect output:
          "ModuleName" "filename" "Description" "Packages" "Requires" "Excludes" "Category"
    '''
    remods = re.compile(b'\s*#\s*\\\\DeclareLyXModule\s*(?:\[([^]]*?)\])?{(.*)}')
    rereqs = re.compile(b'\s*#+\s*Requires: (.*)')
    reexcs = re.compile(b'\s*#+\s*Excludes: (.*)')
    recaty = re.compile(b'\s*#+\s*Category: (.*)')
    redbeg = re.compile(b'\s*#+\s*DescriptionBegin\s*$')
    redend = re.compile(b'\s*#+\s*DescriptionEnd\s*$')

    modname = desc = pkgs = req = excl = catgy = b""
    readingDescription = False
    descLines = []

    for line in open(file, 'rb').readlines():
      if readingDescription:
        res = redend.match(line)
        if res != None:
          readingDescription = False
          desc = b" ".join(descLines)
          # Escape quotes.
          desc = desc.replace(b'"', b'\\"')
          continue
        descLines.append(line[1:].strip())
        continue
      res = redbeg.match(line)
      if res != None:
        readingDescription = True
        continue
      res = remods.match(line)
      if res != None:
          (pkgs, modname) = res.groups()
          if pkgs == None:
            pkgs = b""
          else:
            tmp = [s.strip() for s in pkgs.split(b",")]
            pkgs = b",".join(tmp)
          continue
      res = rereqs.match(line)
      if res != None:
        req = res.group(1)
        tmp = [s.strip() for s in req.split(b"|")]
        req = b"|".join(tmp)
        continue
      res = reexcs.match(line)
      if res != None:
        excl = res.group(1)
        tmp = [s.strip() for s in excl.split(b"|")]
        excl = b"|".join(tmp)
        continue
      res = recaty.match(line)
      if res != None:
        catgy = res.group(1)
        continue

    if modname == b"":
      logger.warning("Module file without \DeclareLyXModule line. ")
      return b""

    if pkgs != b"":
        # this module has some latex dependencies:
        # append the dependencies to chkmodules.tex,
        # which is \input'ed by chkconfig.ltx
        testpackages = list()
        for pkg in pkgs.split(b","):
            if b"->" in pkg:
                # this is a converter dependency: skip
                continue
            if pkg.endswith(b".sty"):
                pkg = pkg[:-4]
            testpackages.append("\\TestPackage{%s}" % (pkg.decode('ascii'),))
        cm = open('chkmodules.tex', 'a')
        for line in testpackages:
            cm.write(line + '\n')
        cm.close()

    return (b'"%s" "%s" "%s" "%s" "%s" "%s" "%s"\n'
            % (modname, filename, desc, pkgs, req, excl, catgy))


def checkCiteEnginesConfig():
  removeFiles(['lyxciteengines.lst', 'chkciteengines.tex'])

  logger.info('+checking list of cite engines... ')
  tx = open('lyxciteengines.lst', 'wb')
  tx.write(b'''## This file declares cite engines and their associated definition files.
## It has been automatically generated by configure
## Use "Options/Reconfigure" if you need to update it after a
## configuration change.
## "CiteEngineName" "filename" "CiteEngineType" "CiteFramework" "DefaultBiblio" "Description" "Packages"
''')

  # build the list of available modules
  seen = []
  # note that this searches the local directory first, then the
  # system directory. that way, we pick up the user's version first.
  for file in glob.glob( os.path.join('citeengines', '*.citeengine') ) + \
      glob.glob( os.path.join(srcdir, 'citeengines', '*.citeengine' ) ) :
      # valid file?
      logger.info(file)
      if not os.path.isfile(file):
          continue

      filename = file.split(os.sep)[-1]
      filename = filename[:-11]
      if seen.count(filename):
          continue

      seen.append(filename)
      retval = processCiteEngineFile(file, filename.encode('ascii'), bool_docbook)
      if retval != b"":
          tx.write(retval)
  tx.close()
  logger.info('\tdone')


def processCiteEngineFile(file, filename, bool_docbook):
    ''' process cite engines file and get a line of result

        The top of a cite engine file should look like this:
          #\DeclareLyXCiteEngine[LaTeX Packages]{CiteEngineName}
          #DescriptionBegin
          #...body of description...
          #DescriptionEnd
        We expect output:
          "CiteEngineName" "filename" "CiteEngineType" "CiteFramework" "DefaultBiblio" "Description" "Packages"
    '''
    remods = re.compile(b'\s*#\s*\\\\DeclareLyXCiteEngine\s*(?:\[([^]]*?)\])?{(.*)}')
    redbeg = re.compile(b'\s*#+\s*DescriptionBegin\s*$')
    redend = re.compile(b'\s*#+\s*DescriptionEnd\s*$')
    recet = re.compile(b'\s*CiteEngineType\s*(.*)')
    redb = re.compile(b'\s*DefaultBiblio\s*(.*)')
    resfm = re.compile(b'\s*CiteFramework\s*(.*)')

    modname = desc = pkgs = cet = db = cfm = ""
    readingDescription = False
    descLines = []

    for line in open(file, 'rb').readlines():
      if readingDescription:
        res = redend.match(line)
        if res != None:
          readingDescription = False
          desc = b" ".join(descLines)
          # Escape quotes.
          desc = desc.replace(b'"', b'\\"')
          continue
        descLines.append(line[1:].strip())
        continue
      res = redbeg.match(line)
      if res != None:
        readingDescription = True
        continue
      res = remods.match(line)
      if res != None:
          (pkgs, modname) = res.groups()
          if pkgs == None:
            pkgs = b""
          else:
            tmp = [s.strip() for s in pkgs.split(b",")]
            pkgs = b",".join(tmp)
          continue
      res = recet.match(line)
      if res != None:
        cet = res.group(1)
        continue
      res = redb.match(line)
      if res != None:
        db = res.group(1)
        continue
      res = resfm.match(line)
      if res != None:
        cfm = res.group(1)
        continue

    if modname == b"":
      logger.warning("Cite Engine File file without \DeclareLyXCiteEngine line. ")
      return b""

    if pkgs != b"":
        # this cite engine has some latex dependencies:
        # append the dependencies to chkciteengines.tex,
        # which is \input'ed by chkconfig.ltx
        testpackages = list()
        for pkg in pkgs.split(b","):
            if b"->" in pkg:
                # this is a converter dependency: skip
                continue
            if pkg.endswith(b".sty"):
                pkg = pkg[:-4]
            testpackages.append("\\TestPackage{%s}" % (pkg.decode('ascii'),))
        cm = open('chkciteengines.tex', 'a')
        for line in testpackages:
            cm.write(line + '\n')
        cm.close()

    return (b'"%s" "%s" "%s" "%s" "%s" "%s" "%s"\n' % (modname, filename, cet, cfm, db, desc, pkgs))


def checkXTemplates():
  removeFiles(['xtemplates.lst'])

  logger.info('+checking list of external templates... ')
  tx = open('xtemplates.lst', 'w')
  tx.write('''## This file lists external templates.
## It has been automatically generated by configure
## Use "Options/Reconfigure" if you need to update it after a
## configuration change.
''')

  # build the list of available templates
  seen = []
  # note that this searches the local directory first, then the
  # system directory. that way, we pick up the user's version first.
  for file in glob.glob( os.path.join('xtemplates', '*.xtemplate') ) + \
      glob.glob( os.path.join(srcdir, 'xtemplates', '*.xtemplate' ) ) :
      # valid file?
      logger.info(file)
      if not os.path.isfile(file):
          continue

      filename = file.split(os.sep)[-1]
      if seen.count(filename):
          continue

      seen.append(filename)
      if filename != "":
          tx.write(filename + "\n")
  tx.close()
  logger.info('\tdone')


def checkTeXAllowSpaces():
    ''' Let's check whether spaces are allowed in TeX file names '''
    tex_allows_spaces = 'false'
    if lyx_check_config:
        msg = "Checking whether TeX allows spaces in file names... "
        writeToFile('a b.tex', r'\message{working^^J}' )
        if LATEX != '':
            if os.name == 'nt' or sys.platform == 'cygwin':
                latex_out = cmdOutput(LATEX + r""" "\nonstopmode\input{\"a b\"}\makeatletter\@@end" """)
            else:
                latex_out = cmdOutput(LATEX + r""" '\nonstopmode\input{"a b"}\makeatletter\@@end' """)
        else:
            latex_out = ''
        if 'working' in latex_out:
            logger.info(msg + 'yes')
            tex_allows_spaces = 'true'
        else:
            logger.info(msg + 'no')
            tex_allows_spaces = 'false'
        addToRC(r'\tex_allows_spaces ' + tex_allows_spaces)
        removeFiles( [ 'a b.tex', 'a b.log', 'texput.log' ])


def rescanTeXFiles():
    ''' Run kpsewhich to update information about TeX files '''
    logger.info("+Indexing TeX files... ")
    tfscript = os.path.join(srcdir, 'scripts', 'TeXFiles.py')
    if not os.path.isfile(tfscript):
        logger.error("configure: error: cannot find TeXFiles.py script")
        sys.exit(1)
    interpreter = sys.executable
    if interpreter == '':
        interpreter = "python"
    tfp = cmdOutput('"%s" -tt "%s"' % (interpreter, tfscript))
    logger.info(tfp)
    logger.info("\tdone")


def removeTempFiles():
    # Final clean-up
    if not lyx_keep_temps:
        removeFiles(['chkconfig.vars', 'chklatex.ltx', 'chklatex.log',
            'chklayouts.tex', 'chkmodules.tex', 'chkciteengines.tex',
            'missfont.log', 'wrap_chkconfig.ltx', 'wrap_chkconfig.log'])


if __name__ == '__main__':
    lyx_check_config = True
    lyx_kpsewhich = True
    outfile = 'lyxrc.defaults'
    lyxrc_fileformat = 29
    rc_entries = ''
    lyx_keep_temps = False
    version_suffix = ''
    lyx_binary_dir = ''
    ## Parse the command line
    for op in sys.argv[1:]:   # default shell/for list is $*, the options
        if op in [ '-help', '--help', '-h' ]:
            print('''Usage: configure [options]
Options:
    --help                   show this help lines
    --keep-temps             keep temporary files (for debug. purposes)
    --without-kpsewhich      do not update TeX files information via kpsewhich
    --without-latex-config   do not run LaTeX to determine configuration
    --with-version-suffix=suffix suffix of binary installed files
    --binary-dir=directory   directory of binary installed files
''')
            sys.exit(0)
        elif op == '--without-kpsewhich':
            lyx_kpsewhich = False
        elif op == '--without-latex-config':
            lyx_check_config = False
        elif op == '--keep-temps':
            lyx_keep_temps = True
        elif op[0:22] == '--with-version-suffix=':  # never mind if op is not long enough
            version_suffix = op[22:]
        elif op[0:13] == '--binary-dir=':
            lyx_binary_dir = op[13:]
        else:
            print("Unknown option %s" % op)
            sys.exit(1)
    #
    # check if we run from the right directory
    srcdir = os.path.dirname(sys.argv[0])
    if srcdir == '':
        srcdir = '.'
    if not os.path.isfile( os.path.join(srcdir, 'chkconfig.ltx') ):
        logger.error("configure: error: cannot find chkconfig.ltx script")
        sys.exit(1)
    setEnviron()
    if sys.platform == 'darwin' and len(version_suffix) > 0:
        checkUpgrade()
    createDirectories()
    dtl_tools = checkDTLtools()
    ## Write the first part of outfile
    writeToFile(outfile, '''# This file has been automatically generated by LyX' lib/configure.py
# script. It contains default settings that have been determined by
# examining your system. PLEASE DO NOT MODIFY ANYTHING HERE! If you
# want to customize LyX, use LyX' Preferences dialog or modify directly
# the "preferences" file instead. Any setting in that file will
# override the values given here.

Format %i

''' % lyxrc_fileformat)
    # check latex
    LATEX = checkLatex(dtl_tools)
    # check java and perl before any checkProg that may require them
    java = checkProg('a java interpreter', ['java'])[1]
    perl = checkProg('a perl interpreter', ['perl'])[1]
    (inkscape_path, inkscape_gui) = os.path.split(checkInkscape())
    # On Windows, we need to call the "inkscape.com" wrapper
    # for command line purposes. Other OSes do not differentiate.
    inkscape_cl = inkscape_gui
    if os.name == 'nt':
        inkscape_cl = inkscape_gui.replace('.exe', '.com')
    # On MacOSX, Inkscape requires full path file arguments. This
    # is not needed on Linux and Win and even breaks the latter.
    inkscape_fileprefix = ""
    if sys.platform == 'darwin':
        inkscape_fileprefix = "$$p"
    checkFormatEntries(dtl_tools)
    checkConverterEntries()
    (chk_docbook, bool_docbook, docbook_cmd) = checkDocBook()
    checkTeXAllowSpaces()
    windows_style_tex_paths = checkTeXPaths()
    if windows_style_tex_paths != '':
        addToRC(r'\tex_expects_windows_paths %s' % windows_style_tex_paths)
    checkOtherEntries()
    if lyx_kpsewhich:
        rescanTeXFiles()
    checkModulesConfig()
    checkCiteEnginesConfig()
    checkXTemplates()
    # --without-latex-config can disable lyx_check_config
    ret = checkLatexConfig(lyx_check_config and LATEX != '', bool_docbook)
    removeTempFiles()
    # The return error code can be 256. Because most systems expect an error code
    # in the range 0-127, 256 can be interpretted as 'success'. Because we expect
    # a None for success, 'ret is not None' is used to exit.
    sys.exit(ret is not None)