#!/usr/bin/env python

"""usage: %s DOC ...

where DOC is the name of a document

"""

from __future__ import absolute_import

import os

import sys

import textwrap

# This script is executed during installs and may not have C extensions

# available. Relax C module requirements.

os.environ['HGMODULEPOLICY'] = 'allow'

# import from the live mercurial repo

sys.path.insert(0, "..")

from mercurial import demandimport; demandimport.enable()

from mercurial import (

    commands,

    extensions,

    help,

    minirst,

    ui as uimod,

)

from mercurial.i18n import (

    gettext,

    _,

)

table = commands.table

globalopts = commands.globalopts

helptable = help.helptable

loaddoc = help.loaddoc

def get_desc(docstr):

    if not docstr:

        return "", ""

    # sanitize

    docstr = docstr.strip("\n")

    docstr = docstr.rstrip()

    shortdesc = docstr.splitlines()[0].strip()

    i = docstr.find("\n")

    if i != -1:

        desc = docstr[i + 2:]

    else:

        desc = shortdesc

    desc = textwrap.dedent(desc)

    return (shortdesc, desc)

def get_opts(opts):

    for opt in opts:

        if len(opt) == 5:

            shortopt, longopt, default, desc, optlabel = opt

        else:

            shortopt, longopt, default, desc = opt

            optlabel = _("VALUE")

        allopts = []

        if shortopt:

            allopts.append("-%s" % shortopt)

        if longopt:

            allopts.append("--%s" % longopt)

        if isinstance(default, list):

            allopts[-1] += " <%s[+]>" % optlabel

        elif (default is not None) and not isinstance(default, bool):

            allopts[-1] += " <%s>" % optlabel

        if '\n' in desc:

            # only remove line breaks and indentation

            desc = ' '.join(l.lstrip() for l in desc.split('\n'))

        desc += default and _(" (default: %s)") % default or ""

        yield (", ".join(allopts), desc)

def get_cmd(cmd, cmdtable):

    d = {}

    attr = cmdtable[cmd]

    cmds = cmd.lstrip("^").split("|")

    d['cmd'] = cmds[0]

    d['aliases'] = cmd.split("|")[1:]

    d['desc'] = get_desc(gettext(attr[0].__doc__))

    d['opts'] = list(get_opts(attr[1]))

    s = 'hg ' + cmds[0]

    if len(attr) > 2:

        if not attr[2].startswith('hg'):

            s += ' ' + attr[2]

        else:

            s = attr[2]

    d['synopsis'] = s.strip()

    return d

def showdoc(ui):

    # print options

    ui.write(minirst.section(_("Options")))

    multioccur = False

    for optstr, desc in get_opts(globalopts):

        ui.write("%s\n    %s\n\n" % (optstr, desc))

        if optstr.endswith("[+]>"):

            multioccur = True

    if multioccur:

        ui.write(_("\n[+] marked option can be specified multiple times\n"))

        ui.write("\n")

    # print cmds

    ui.write(minirst.section(_("Commands")))

    commandprinter(ui, table, minirst.subsection)

    # print help topics

    # The config help topic is included in the hgrc.5 man page.

    helpprinter(ui, helptable, minirst.section, exclude=['config'])

    ui.write(minirst.section(_("Extensions")))

    ui.write(_("This section contains help for extensions that are "

               "distributed together with Mercurial. Help for other "

               "extensions is available in the help system."))

    ui.write(("\n\n"

             ".. contents::\n"

             "   :class: htmlonly\n"

             "   :local:\n"

             "   :depth: 1\n\n"))

    for extensionname in sorted(allextensionnames()):

        mod = extensions.load(ui, extensionname, None)

        ui.write(minirst.subsection(extensionname))

        ui.write("%s\n\n" % gettext(mod.__doc__))

        cmdtable = getattr(mod, 'cmdtable', None)

        if cmdtable:

            ui.write(minirst.subsubsection(_('Commands')))

            commandprinter(ui, cmdtable, minirst.subsubsubsection)

def showtopic(ui, topic):

    extrahelptable = [

        (["common"], '', loaddoc('common')),

        (["hg.1"], '', loaddoc('hg.1')),

        (["hg-ssh.8"], '', loaddoc('hg-ssh.8')),

        (["hgignore.5"], '', loaddoc('hgignore.5')),

        (["hgrc.5"], '', loaddoc('hgrc.5')),

        (["hgignore.5.gendoc"], '', loaddoc('hgignore')),

        (["hgrc.5.gendoc"], '', loaddoc('config')),

    ]

    helpprinter(ui, helptable + extrahelptable, None, include=[topic])

def helpprinter(ui, helptable, sectionfunc, include=[], exclude=[]):

    for names, sec, doc in helptable:

        if exclude and names[0] in exclude:

            continue

        if include and names[0] not in include:

            continue

        for name in names:

            ui.write(".. _%s:\n" % name)

        ui.write("\n")

        if sectionfunc:

            ui.write(sectionfunc(sec))

        if callable(doc):

            doc = doc(ui)

        ui.write(doc)

        ui.write("\n")

def commandprinter(ui, cmdtable, sectionfunc):

    h = {}

    for c, attr in cmdtable.items():

        f = c.split("|")[0]

        f = f.lstrip("^")

        h[f] = c

    cmds = h.keys()

    cmds.sort()

    for f in cmds:

        if f.startswith("debug"):

            continue

        d = get_cmd(h[f], cmdtable)

        ui.write(sectionfunc(d['cmd']))

        # short description

        ui.write(d['desc'][0])

        # synopsis

        ui.write("::\n\n")

        synopsislines = d['synopsis'].splitlines()

        for line in synopsislines:

            # some commands (such as rebase) have a multi-line

            # synopsis

            ui.write("   %s\n" % line)

        ui.write('\n')

        # description

        ui.write("%s\n\n" % d['desc'][1])

        # options

        opt_output = list(d['opts'])

        if opt_output:

            opts_len = max([len(line[0]) for line in opt_output])

            ui.write(_("Options:\n\n"))

            multioccur = False

            for optstr, desc in opt_output:

                if desc:

                    s = "%-*s  %s" % (opts_len, optstr, desc)

                else:

                    s = optstr

                ui.write("%s\n" % s)

                if optstr.endswith("[+]>"):

                    multioccur = True

            if multioccur:

                ui.write(_("\n[+] marked option can be specified"

                           " multiple times\n"))

            ui.write("\n")

        # aliases

        if d['aliases']:

            ui.write(_("    aliases: %s\n\n") % " ".join(d['aliases']))

def allextensionnames():

    return extensions.enabled().keys() + extensions.disabled().keys()

if __name__ == "__main__":

    doc = 'hg.1.gendoc'

    if len(sys.argv) > 1:

        doc = sys.argv[1]

    if doc == 'hg.1.gendoc':

        showdoc(ui)

    else:

        showtopic(ui, sys.argv[1])