# -*- coding: utf-8 -*-
"""
    pygments.cmdline
    ~~~~~~~~~~~~~~~~

    Command line interface.

    :copyright: 2006 by Georg Brandl.
    :license: BSD, see LICENSE for more details.
"""
import sys
import getopt

from pygments import __version__, __author__, highlight
from pygments.lexers import LEXERS, get_lexer_by_name, get_lexer_for_filename
from pygments.util import OptionError
from pygments.formatters import FORMATTERS, get_formatter_by_name, \
     get_formatter_for_filename, TerminalFormatter


USAGE = """\
Usage: %s [-l <lexer>] [-f <formatter>] [-O <options>] [-o <outfile>] [<infile>]
       %s -S <style> -f <formatter> [-a <arg>] [-O <options>]
       %s -L | -h | -V

Highlight the input file and write the result to <outfile>.

If no input file is given, use stdin, if -o is not given, use stdout.

<lexer> is a lexer name (query all lexer names with -L). If -l is not
given, the lexer is guessed from the extension of the input file name
(this obviously doesn't work if the input is stdin).

Likewise, <formatter> is a formatter name, and will be guessed from
the extension of the output file name. If no output file is given,
the terminal formatter will be used by default.

With the -O option, you can give the lexer and formatter a comma-
separated list of options, e.g. ``-O bg=light,python=cool``.

With the -S option, print out style definitions for style <style>
for formatter <formatter>. The argument given by -a is formatter
dependent.

The -L option lists all available lexers and formatters.
The -h option prints this help.
The -V option prints the package version.
"""


def _parse_options(o_str):
    opts = {}
    if not o_str:
        return opts
    o_args = o_str.split(',')
    for o_arg in o_args:
        o_arg = o_arg.strip()
        try:
            o_key, o_val = o_arg.split('=')
            o_key = o_key.strip()
            o_val = o_val.strip()
        except ValueError:
            opts[o_arg] = True
        else:
            opts[o_key] = o_val
    return opts


def _print_lflist():
    # print version
    main(['', '-V'])

    print
    print "Lexers:"
    print "~~~~~~~"

    info = []
    for _, fullname, names, exts, _ in LEXERS.itervalues():
        tup = (', '.join(names)+':', fullname,
               exts and '(extensions ' + ', '.join(exts) + ')' or '')
        info.append(tup)
    info.sort()
    for i in info:
        print ('%s\n    %s %s') % i

    print
    print "Formatters:"
    print "~~~~~~~~~~~"

    info = []
    for fullname, names, exts, doc in FORMATTERS.itervalues():
        tup = (', '.join(names)+':', doc,
               exts and '(extensions ' + ', '.join(exts) + ')' or '')
        info.append(tup)
    info.sort()
    for i in info:
        print ('%s\n    %s %s') % i


def main(args):
    """
    Main command line entry point.
    """
    usage = USAGE % ((args[0],) * 3)

    try:
        opts, args = getopt.getopt(args[1:], "l:f:o:O:LhVS:a:")
    except getopt.GetoptError:
        print >>sys.stderr, usage
        return 2
    opts = dict(opts)

    if not opts and not args:
        print usage
        return 0

    if opts.pop('-h', None) is not None:
        print usage
        return 0

    if opts.pop('-V', None) is not None:
        print 'Pygments version %s, (c) 2006 by %s.' % (__version__, __author__)
        return 0

    # handle ``pygmentize -L``
    L_opt = opts.pop('-L', None)
    if L_opt is not None:
        if opts or args:
            print >>sys.stderr, usage
            return 2

        _print_lflist()
        return 0

    # parse -O options
    O_opts = _parse_options(opts.pop('-O', None))

    # handle ``pygmentize -S``
    S_opt = opts.pop('-S', None)
    a_opt = opts.pop('-a', None)
    if S_opt is not None:
        f_opt = opts.pop('-f', None)
        if not f_opt:
            print >>sys.stderr, usage
            return 2
        if opts or args:
            print >>sys.stderr, usage
            return 2

        try:
            O_opts['style'] = S_opt
            fmter = get_formatter_by_name(f_opt, **O_opts)
        except ValueError, err:
            print >>sys.stderr, err
            return 1

        arg = a_opt or ''
        print fmter.get_style_defs(arg)
        return 0

    # if no -S is given, -a is not allowed
    if a_opt is not None:
        print >>sys.stderr, usage
        return 2

    # select formatter
    outfn = opts.pop('-o', None)
    fmter = opts.pop('-f', None)
    if fmter:
        try:
            fmter = get_formatter_by_name(fmter, **O_opts)
        except (OptionError, ValueError), err:
            print >>sys.stderr, 'Error:', err
            return 1

    if outfn:
        if not fmter:
            try:
                fmter = get_formatter_for_filename(outfn, **O_opts)
            except (OptionError, ValueError), err:
                print >>sys.stderr, 'Error:', err
                return 1
        try:
            outfile = file(outfn, 'wb')
        except Exception, err:
            print >>sys.stderr, 'Error: cannot open outfile:', err
            return 1
    else:
        if not fmter:
            fmter = TerminalFormatter(**O_opts)
        outfile = sys.stdout

    # select lexer
    lexer = opts.pop('-l', None)
    if lexer:
        try:
            lexer = get_lexer_by_name(lexer, **O_opts)
        except (OptionError, ValueError), err:
            print >>sys.stderr, 'Error:', err
            return 1

    if args:
        if len(args) > 1:
            print >>sys.stderr, usage
            return 2

        infn = args[0]
        if not lexer:
            try:
                lexer = get_lexer_for_filename(infn, **O_opts)
            except (OptionError, ValueError), err:
                print >>sys.stderr, 'Error:', err
                return 1

        try:
            code = file(infn).read()
        except Exception, err:
            print >>sys.stderr, 'Error: cannot read infile:', err
            return 1
    else:
        if not lexer:
            print >>sys.stderr, 'Error: no lexer name given and reading from stdin'
            return 2
        code = sys.stdin.read()

    # ... and do it!
    try:
        highlight(code, lexer, fmter, outfile)
    except Exception, err:
        import traceback
        print >>sys.stderr, 'Error while highlighting:'
        print >>sys.stderr, traceback.format_exc(0).splitlines()[-1]
        return 1

    return 0