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# to you under the Apache License, Version 2.0 (the
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#
#   http://www.apache.org/licenses/LICENSE-2.0
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"""
Convett --help output of a program into rst text format.
"""

import re, sys
from qpid_dispatch_internal.compat.subproc import check_output, STDOUT, CalledProcessError
from os import path

def help2rst(help_out):
    VALUE = r"(?:[\w-]+|<[^>]+>)"
    DEFAULT = r"(?: +\([^)]+\))?"
    OPTION = r"-[\w-]+(?:[ =]%s)?%s" % (VALUE, DEFAULT) # -opt[(=| )value][(default)]
    OPTIONS = r"%s(?:, *%s)*" % (OPTION, OPTION)        # opt[,opt...]
    HELP = r"(?:[ \t]+\w.*$)|(?:(?:\n[ \t]+[^-\s].*$)+)" # same line or following lines indented.
    OPT_HELP = r"^\s+(%s)(%s)" % (OPTIONS, HELP)
    SUBHEAD = r"^((?: +\w+)*):$"

    options = re.search("^Options:$", help_out, re.IGNORECASE | re.MULTILINE)
    if (options): help_out = help_out[options.end():]
    result = ""

    def heading(text, underline):
        return "%s\n%s\n\n" % (text, underline*len(text))

    for item in re.finditer(r"%s|%s" % (OPT_HELP, SUBHEAD), help_out, re.IGNORECASE | re.MULTILINE):
        if item.group(3):
            result += heading(item.group(3).strip(), "~")
        else:
            result += "%s\n:   %s\n\n" % (item.group(1), re.sub("\s+", " ", item.group(2)).strip())
    return result

def main(argv):
    if len(argv) < 2: raise ValueError("Wrong number of arguments: "+usage)
    program = argv[1:]
    print help2rst(check_output(program, stderr=STDOUT))

if __name__ == "__main__":
    try:
        main(sys.argv)
    except CalledProcessError, e:
        if hasattr(e, "output") and e.output:
            print "\n%s\n\n%s\n" % (e, e.output)
        raise