# help.py - help data for mercurial

#

# Copyright 2006 Matt Mackall <mpm@selenic.com>

#

# This software may be used and distributed according to the terms of the

# GNU General Public License version 2 or any later version.

from __future__ import absolute_import

import itertools

import os

import textwrap

from .i18n import (

    _,

    gettext,

)

from . import (

    cmdutil,

    encoding,

    error,

    extensions,

    filemerge,

    fileset,

    minirst,

    revset,

    templatefilters,

    templatekw,

    templater,

    util,

)

from .hgweb import (

    webcommands,

)

_exclkeywords = [

    "(DEPRECATED)",

    "(EXPERIMENTAL)",

    # i18n: "(DEPRECATED)" is a keyword, must be translated consistently

    _("(DEPRECATED)"),

    # i18n: "(EXPERIMENTAL)" is a keyword, must be translated consistently

    _("(EXPERIMENTAL)"),

    ]

def listexts(header, exts, indent=1, showdeprecated=False):

    '''return a text listing of the given extensions'''

    rst = []

    if exts:

        for name, desc in sorted(exts.iteritems()):

            if not showdeprecated and any(w in desc for w in _exclkeywords):

                continue

            rst.append('%s:%s: %s\n' % (' ' * indent, name, desc))

    if rst:

        rst.insert(0, '\n%s\n\n' % header)

    return rst

def extshelp(ui):

    rst = loaddoc('extensions')(ui).splitlines(True)

    rst.extend(listexts(

        _('enabled extensions:'), extensions.enabled(), showdeprecated=True))

    rst.extend(listexts(_('disabled extensions:'), extensions.disabled()))

    doc = ''.join(rst)

    return doc

def optrst(header, options, verbose):

    data = []

    multioccur = False

    for option in options:

        if len(option) == 5:

            shortopt, longopt, default, desc, optlabel = option

        else:

            shortopt, longopt, default, desc = option

            optlabel = _("VALUE") # default label

        if not verbose and any(w in desc for w in _exclkeywords):

            continue

        so = ''

        if shortopt:

            so = '-' + shortopt

        lo = '--' + longopt

        if default:

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

        if isinstance(default, list):

            lo += " %s [+]" % optlabel

            multioccur = True

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

            lo += " %s" % optlabel

        data.append((so, lo, desc))

    if multioccur:

        header += (_(" ([+] can be repeated)"))

    rst = ['\n%s:\n\n' % header]

    rst.extend(minirst.maketable(data, 1))

    return ''.join(rst)

def indicateomitted(rst, omitted, notomitted=None):

    rst.append('\n\n.. container:: omitted\n\n    %s\n\n' % omitted)

    if notomitted:

        rst.append('\n\n.. container:: notomitted\n\n    %s\n\n' % notomitted)

def filtercmd(ui, cmd, kw, doc):

    if not ui.debugflag and cmd.startswith("debug") and kw != "debug":

        return True

    if not ui.verbose and doc and any(w in doc for w in _exclkeywords):

        return True

    return False

def topicmatch(ui, kw):

    """Return help topics matching kw.

    Returns {'section': [(name, summary), ...], ...} where section is

    one of topics, commands, extensions, or extensioncommands.

    """

    kw = encoding.lower(kw)

    def lowercontains(container):

        return kw in encoding.lower(container)  # translated in helptable

    results = {'topics': [],

               'commands': [],

               'extensions': [],

               'extensioncommands': [],

               }

    for names, header, doc in helptable:

        # Old extensions may use a str as doc.

        if (sum(map(lowercontains, names))

            or lowercontains(header)

            or (callable(doc) and lowercontains(doc(ui)))):

            results['topics'].append((names[0], header))

    from . import commands # avoid cycle

    for cmd, entry in commands.table.iteritems():

        if len(entry) == 3:

            summary = entry[2]

        else:

            summary = ''

        # translate docs *before* searching there

        docs = _(getattr(entry[0], '__doc__', None)) or ''

        if kw in cmd or lowercontains(summary) or lowercontains(docs):

            doclines = docs.splitlines()

            if doclines:

                summary = doclines[0]

            cmdname = cmd.partition('|')[0].lstrip('^')

            if filtercmd(ui, cmdname, kw, docs):

                continue

            results['commands'].append((cmdname, summary))

    for name, docs in itertools.chain(

        extensions.enabled(False).iteritems(),

        extensions.disabled().iteritems()):

        if not docs:

            continue

        mod = extensions.load(ui, name, '')

        name = name.rpartition('.')[-1]

        if lowercontains(name) or lowercontains(docs):

            # extension docs are already translated

            results['extensions'].append((name, docs.splitlines()[0]))

        for cmd, entry in getattr(mod, 'cmdtable', {}).iteritems():

            if kw in cmd or (len(entry) > 2 and lowercontains(entry[2])):

                cmdname = cmd.partition('|')[0].lstrip('^')

                if entry[0].__doc__:

                    cmddoc = gettext(entry[0].__doc__).splitlines()[0]

                else:

                    cmddoc = _('(no help text available)')

                if filtercmd(ui, cmdname, kw, cmddoc):

                    continue

                results['extensioncommands'].append((cmdname, cmddoc))

    return results

def loaddoc(topic, subdir=None):

    """Return a delayed loader for help/topic.txt."""

    def loader(ui):

        docdir = os.path.join(util.datapath, 'help')

        if subdir:

            docdir = os.path.join(docdir, subdir)

        path = os.path.join(docdir, topic + ".txt")

        doc = gettext(util.readfile(path))

        for rewriter in helphooks.get(topic, []):

            doc = rewriter(ui, topic, doc)

        return doc

    return loader

internalstable = sorted([

    (['bundles'], _('Bundles'),

     loaddoc('bundles', subdir='internals')),

    (['changegroups'], _('Changegroups'),

     loaddoc('changegroups', subdir='internals')),

    (['requirements'], _('Repository Requirements'),

     loaddoc('requirements', subdir='internals')),

    (['revlogs'], _('Revision Logs'),

     loaddoc('revlogs', subdir='internals')),

    (['wireprotocol'], _('Wire Protocol'),

     loaddoc('wireprotocol', subdir='internals')),

])

def internalshelp(ui):

    """Generate the index for the "internals" topic."""

    lines = []

    for names, header, doc in internalstable:

        lines.append(' :%s: %s\n' % (names[0], header))

    return ''.join(lines)

helptable = sorted([

    (["config", "hgrc"], _("Configuration Files"), loaddoc('config')),

    (["dates"], _("Date Formats"), loaddoc('dates')),

    (["patterns"], _("File Name Patterns"), loaddoc('patterns')),

    (['environment', 'env'], _('Environment Variables'),

     loaddoc('environment')),

    (['revisions', 'revs'], _('Specifying Single Revisions'),

     loaddoc('revisions')),

    (['multirevs', 'mrevs'], _('Specifying Multiple Revisions'),

     loaddoc('multirevs')),

    (['revsets', 'revset'], _("Specifying Revision Sets"), loaddoc('revsets')),

    (['filesets', 'fileset'], _("Specifying File Sets"), loaddoc('filesets')),

    (['diffs'], _('Diff Formats'), loaddoc('diffs')),

    (['merge-tools', 'mergetools'], _('Merge Tools'), loaddoc('merge-tools')),

    (['templating', 'templates', 'template', 'style'], _('Template Usage'),

     loaddoc('templates')),

    (['urls'], _('URL Paths'), loaddoc('urls')),

    (["extensions"], _("Using Additional Features"), extshelp),

    (["subrepos", "subrepo"], _("Subrepositories"), loaddoc('subrepos')),

    (["hgweb"], _("Configuring hgweb"), loaddoc('hgweb')),

    (["glossary"], _("Glossary"), loaddoc('glossary')),

    (["hgignore", "ignore"], _("Syntax for Mercurial Ignore Files"),

     loaddoc('hgignore')),

    (["phases"], _("Working with Phases"), loaddoc('phases')),

    (['scripting'], _('Using Mercurial from scripts and automation'),

     loaddoc('scripting')),

    (['internals'], _("Technical implementation topics"),

     internalshelp),

])

# Maps topics with sub-topics to a list of their sub-topics.

subtopics = {

    'internals': internalstable,

}

# Map topics to lists of callable taking the current topic help and

# returning the updated version

helphooks = {}

def addtopichook(topic, rewriter):

    helphooks.setdefault(topic, []).append(rewriter)

def makeitemsdoc(ui, topic, doc, marker, items, dedent=False):

    """Extract docstring from the items key to function mapping, build a

    single documentation block and use it to overwrite the marker in doc.

    """

    entries = []

    for name in sorted(items):

        text = (items[name].__doc__ or '').rstrip()

        if (not text

            or not ui.verbose and any(w in text for w in _exclkeywords)):

            continue

        text = gettext(text)

        if dedent:

            text = textwrap.dedent(text)

        lines = text.splitlines()

        doclines = [(lines[0])]

        for l in lines[1:]:

            # Stop once we find some Python doctest

            if l.strip().startswith('>>>'):

                break

            if dedent:

                doclines.append(l.rstrip())

            else:

                doclines.append('  ' + l.strip())

        entries.append('\n'.join(doclines))

    entries = '\n\n'.join(entries)

    return doc.replace(marker, entries)

def addtopicsymbols(topic, marker, symbols, dedent=False):

    def add(ui, topic, doc):

        return makeitemsdoc(ui, topic, doc, marker, symbols, dedent=dedent)

    addtopichook(topic, add)

addtopicsymbols('filesets', '.. predicatesmarker', fileset.symbols)

addtopicsymbols('merge-tools', '.. internaltoolsmarker',

                filemerge.internalsdoc)

addtopicsymbols('revsets', '.. predicatesmarker', revset.symbols)

addtopicsymbols('templates', '.. keywordsmarker', templatekw.keywords)

addtopicsymbols('templates', '.. filtersmarker', templatefilters.filters)

addtopicsymbols('templates', '.. functionsmarker', templater.funcs)

addtopicsymbols('hgweb', '.. webcommandsmarker', webcommands.commands,

                dedent=True)

def help_(ui, name, unknowncmd=False, full=True, subtopic=None, **opts):

    '''

    Generate the help for 'name' as unformatted restructured text. If

    'name' is None, describe the commands available.

    '''

    from . import commands # avoid cycle

    def helpcmd(name, subtopic=None):

        try:

            aliases, entry = cmdutil.findcmd(name, commands.table,

                                             strict=unknowncmd)

        except error.AmbiguousCommand as inst:

            # py3k fix: except vars can't be used outside the scope of the

            # except block, nor can be used inside a lambda. python issue4617

            prefix = inst.args[0]

            select = lambda c: c.lstrip('^').startswith(prefix)

            rst = helplist(select)

            return rst

        rst = []

        # check if it's an invalid alias and display its error if it is

        if getattr(entry[0], 'badalias', None):

            rst.append(entry[0].badalias + '\n')

            if entry[0].unknowncmd:

                try:

                    rst.extend(helpextcmd(entry[0].cmdname))

                except error.UnknownCommand:

                    pass

            return rst

        # synopsis

        if len(entry) > 2:

            if entry[2].startswith('hg'):

                rst.append("%s\n" % entry[2])

            else:

                rst.append('hg %s %s\n' % (aliases[0], entry[2]))

        else:

            rst.append('hg %s\n' % aliases[0])

        # aliases

        if full and not ui.quiet and len(aliases) > 1:

            rst.append(_("\naliases: %s\n") % ', '.join(aliases[1:]))

        rst.append('\n')

        # description

        doc = gettext(entry[0].__doc__)

        if not doc:

            doc = _("(no help text available)")

        if util.safehasattr(entry[0], 'definition'):  # aliased command

            source = entry[0].source

            if entry[0].definition.startswith('!'):  # shell alias

                doc = (_('shell alias for::\n\n    %s\n\ndefined by: %s\n') %

                       (entry[0].definition[1:], source))

            else:

                doc = (_('alias for: hg %s\n\n%s\n\ndefined by: %s\n') %

                       (entry[0].definition, doc, source))

        doc = doc.splitlines(True)

        if ui.quiet or not full:

            rst.append(doc[0])

        else:

            rst.extend(doc)

        rst.append('\n')