# 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 i18n import gettext, _

import itertools, os

import error

import extensions, revset, fileset, templatekw, templatefilters, filemerge

import encoding, util, minirst

import cmdutil

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

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

    rst = []

    if exts:

        rst.append('\n%s\n\n' % header)

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

            if '(DEPRECATED)' in desc and not showdeprecated:

                continue

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

    return rst

def extshelp():

    rst = loaddoc('extensions')().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 ("DEPRECATED" in desc or _("DEPRECATED") in desc):

            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 topicmatch(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()))):

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

    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.split('|')[0].lstrip('^')

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

    for name, docs in itertools.chain(

        extensions.enabled(False).iteritems(),

        extensions.disabled().iteritems()):

        # extensions.load ignores the UI argument

        mod = extensions.load(None, name, '')

        name = name.split('.')[-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.split('|')[0].lstrip('^')

                if entry[0].__doc__:

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

                else:

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

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

    return results

def loaddoc(topic):

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

    def loader():

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

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

        doc = gettext(util.readfile(path))

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

            doc = rewriter(topic, doc)

        return doc

    return loader

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')),

])

# 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(topic, doc, marker, items):

    """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:

            continue

        text = gettext(text)

        lines = text.splitlines()

        doclines = [(lines[0])]

        for l in lines[1:]:

            # Stop once we find some Python doctest

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

                break

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

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

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

    return doc.replace(marker, entries)

def addtopicsymbols(topic, marker, symbols):

    def add(topic, doc):

        return makeitemsdoc(topic, doc, marker, symbols)

    addtopichook(topic, add)

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

addtopicsymbols('merge-tools', '.. internaltoolsmarker', filemerge.internals)

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

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

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

def help_(ui, name, unknowncmd=False, full=True, **opts):

    '''

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

    'name' is None, describe the commands available.

    '''

    import commands # avoid cycle

    def helpcmd(name):

        try:

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

                                             strict=unknowncmd)

        except error.AmbiguousCommand, 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

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

                doc = _('shell alias for::\n\n    %s') % entry[0].definition[1:]

            else:

                doc = _('alias for: hg %s\n\n%s') % (entry[0].definition, doc)

        doc = doc.splitlines(True)

        if ui.quiet or not full:

            rst.append(doc[0])

        else:

            rst.extend(doc)

        rst.append('\n')

        # check if this command shadows a non-trivial (multi-line)

        # extension help text

        try:

            mod = extensions.find(name)

            doc = gettext(mod.__doc__) or ''

            if '\n' in doc.strip():

                msg = _('(use "hg help -e %s" to show help for '

                        'the %s extension)') % (name, name)

                rst.append('\n%s\n' % msg)

        except KeyError:

            pass

        # options

        if not ui.quiet and entry[1]:

            rst.append(optrst(_("options"), entry[1], ui.verbose))

        if ui.verbose:

            rst.append(optrst(_("global options"),

                              commands.globalopts, ui.verbose))

        if not ui.verbose:

            if not full:

                rst.append(_('\n(use "hg %s -h" to show more help)\n')

                           % name)

            elif not ui.quiet:

                rst.append(_('\n(some details hidden, use --verbose '

                               'to show complete help)'))

        return rst

    def helplist(select=None):

        # list of commands

        if name == "shortlist":

            header = _('basic commands:\n\n')

        elif name == "debug":

            header = _('debug commands (internal and unsupported):\n\n')

        else:

            header = _('list of commands:\n\n')

        h = {}

        cmds = {}

        for c, e in commands.table.iteritems():

            f = c.split("|", 1)[0]

            if select and not select(f):

                continue

            if (not select and name != 'shortlist' and

                e[0].__module__ != commands.__name__):

                continue

            if name == "shortlist" and not f.startswith("^"):

                continue

            f = f.lstrip("^")

            if not ui.debugflag and f.startswith("debug") and name != "debug":

                continue

            doc = e[0].__doc__

            if doc and 'DEPRECATED' in doc and not ui.verbose:

                continue

            doc = gettext(doc)

            if not doc:

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

            h[f] = doc.splitlines()[0].rstrip()

            cmds[f] = c.lstrip("^")

        rst = []

        if not h:

            if not ui.quiet:

                rst.append(_('no commands defined\n'))

            return rst

        if not ui.quiet:

            rst.append(header)

        fns = sorted(h)

        for f in fns:

            if ui.verbose:

                commacmds = cmds[f].replace("|",", ")

                rst.append(" :%s: %s\n" % (commacmds, h[f]))

            else:

                rst.append(' :%s: %s\n' % (f, h[f]))

        if not name:

            exts = listexts(_('enabled extensions:'), extensions.enabled())

            if exts:

                rst.append('\n')

                rst.extend(exts)

            rst.append(_("\nadditional help topics:\n\n"))

            topics = []

            for names, header, doc in helptable:

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

            for t, desc in topics:

                rst.append(" :%s: %s\n" % (t, desc))

        if ui.quiet:

            pass

        elif ui.verbose:

            rst.append('\n%s\n' % optrst(_("global options"),

                                         commands.globalopts, ui.verbose))

            if name == 'shortlist':

                rst.append(_('\n(use "hg help" for the full list '

                             'of commands)\n'))

        else:

            if name == 'shortlist':

                rst.append(_('\n(use "hg help" for the full list of commands '

                             'or "hg -v" for details)\n'))

            elif name and not full:

                rst.append(_('\n(use "hg help %s" to show the full help '

                             'text)\n') % name)

            elif name and cmds and name in cmds.keys():

                rst.append(_('\n(use "hg help -v -e %s" to show built-in '

                             'aliases and global options)\n') % name)

            else:

                rst.append(_('\n(use "hg help -v%s" to show built-in aliases '

                             'and global options)\n')

                           % (name and " " + name or ""))

        return rst

    def helptopic(name):

        for names, header, doc in helptable:

            if name in names:

                break

        else:

            raise error.UnknownCommand(name)

        rst = [minirst.section(header)]

        # description

        if not doc:

            rst.append("    %s\n" % _("(no help text available)"))

        if callable(doc):

            rst += ["    %s\n" % l for l in doc().splitlines()]

        if not ui.verbose:

            omitted = _('(some details hidden, use --verbose'

                         ' to show complete help)')

            indicateomitted(rst, omitted)

        try:

            cmdutil.findcmd(name, commands.table)

            rst.append(_('\nuse "hg help -c %s" to see help for '

                       'the %s command\n') % (name, name))

        except error.UnknownCommand:

            pass

        return rst

    def helpext(name):

        try:

            mod = extensions.find(name)

            doc = gettext(mod.__doc__) or _('no help text available')

        except KeyError:

            mod = None

            doc = extensions.disabledext(name)

            if not doc:

                raise error.UnknownCommand(name)

        if '\n' not in doc:

            head, tail = doc, ""

        else:

            head, tail = doc.split('\n', 1)

        rst = [_('%s extension - %s\n\n') % (name.split('.')[-1], head)]

        if tail:

            rst.extend(tail.splitlines(True))

            rst.append('\n')

        if not ui.verbose:

            omitted = _('(some details hidden, use --verbose'

                         ' to show complete help)')

            indicateomitted(rst, omitted)

        if mod:

            try:

                ct = mod.cmdtable

            except AttributeError:

                ct = {}

            modcmds = set([c.split('|', 1)[0] for c in ct])

            rst.extend(helplist(modcmds.__contains__))

        else:

            rst.append(_('(use "hg help extensions" for information on enabling'

                       ' extensions)\n'))

        return rst

    def helpextcmd(name):

        cmd, ext, mod = extensions.disabledcmd(ui, name,

                                               ui.configbool('ui', 'strict'))

        doc = gettext(mod.__doc__).splitlines()[0]

        rst = listexts(_("'%s' is provided by the following "

                              "extension:") % cmd, {ext: doc}, indent=4)

        rst.append('\n')

        rst.append(_('(use "hg help extensions" for information on enabling '

                   'extensions)\n'))

        return rst

    rst = []

    kw = opts.get('keyword')

    if kw:

        matches = topicmatch(kw)

        for t, title in (('topics', _('Topics')),

                         ('commands', _('Commands')),

                         ('extensions', _('Extensions')),

                         ('extensioncommands', _('Extension Commands'))):

            if matches[t]:

                rst.append('%s:\n\n' % title)

                rst.extend(minirst.maketable(sorted(matches[t]), 1))

                rst.append('\n')

        if not rst:

            msg = _('no matches')

            hint = _('try "hg help" for a list of topics')

            raise util.Abort(msg, hint=hint)

    elif name and name != 'shortlist':

        if unknowncmd:

            queries = (helpextcmd,)

        elif opts.get('extension'):

            queries = (helpext,)

        elif opts.get('command'):

            queries = (helpcmd,)

        else:

            queries = (helptopic, helpcmd, helpext, helpextcmd)

        for f in queries: