view mercurial/help.py @ 21014:a6246bba7b9e

bundle2: add an unbundle part responsible from unbundling part

We have a new unbundle class and it is now responsible from extracting its own
data. The top level bundler only extracts the header (to detect an end of stream
marker) then leaves everything else to the `unbundlepart` class. The ultimate
goal is to have `unbundlepart` responsible for lazily extracting its payload.

This is mostly code movement.

# help.py - help data for mercurial
#
# Copyright 2006 Matt Mackall <[e-mail]>
#
# 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, sys, 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(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))

    rst = minirst.maketable(data, 1)

    if multioccur:
        rst.append(_("\n[+] marked option can be specified multiple times\n"))

    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:
        if (sum(map(lowercontains, names))
            or lowercontains(header)
            or 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():
        if util.mainfrozen():
            module = sys.executable
        else:
            module = __file__
        base = os.path.dirname(module)

        for dir in ('.', '..'):
            docdir = os.path.join(base, dir, 'help')
            if os.path.isdir(docdir):
                break

        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', False):
            if not unknowncmd:
                ui.pushbuffer()
                entry[0](ui)
                rst.append(ui.popbuffer())
            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('\n%s\n\n' % _("options:"))
            rst.append(optrst(entry[1], ui.verbose))

        if ui.verbose:
            rst.append('\n%s\n\n' % _("global options:"))
            rst.append(optrst(commands.globalopts, ui.verbose))

        if not ui.verbose:
            if not full:
                rst.append(_('\nuse "hg help %s" to show the full help text\n')
                           % name)
            elif not ui.quiet:
                omitted = _('use "hg -v help %s" to show more complete'
                            ' help and the global options') % name
                notomitted = _('use "hg -v help %s" to show'
                               ' the global options') % name
                indicateomitted(rst, omitted, notomitted)

        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))

        optlist = []
        if not ui.quiet:
            if ui.verbose:
                optlist.append((_("global options:"), commands.globalopts))
                if name == 'shortlist':
                    optlist.append((_('use "hg help" for the full list '
                                           'of commands'), ()))
            else:
                if name == 'shortlist':
                    msg = _('use "hg help" for the full list of commands '
                            'or "hg -v" for details')
                elif name and not full:
                    msg = _('use "hg help %s" to show the full help '
                            'text') % name
                else:
                    msg = _('use "hg -v help%s" to show builtin aliases and '
                            'global options') % (name and " " + name or "")
                optlist.append((msg, ()))

        if optlist:
            for title, options in optlist:
                rst.append('\n%s\n' % title)
                if options:
                    rst.append('\n%s\n' % optrst(options, ui.verbose))
        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 util.safehasattr(doc, '__call__'):
            rst += ["    %s\n" % l for l in doc().splitlines()]

        if not ui.verbose:
            omitted = (_('use "hg help -v %s" to show more complete help') %
                       name)
            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 = (_('use "hg help -v %s" to show more complete help') %
                       name)
            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')
    elif name and name != 'shortlist':
        i = None
        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:
            try:
                rst = f(name)
                i = None
                break
            except error.UnknownCommand, inst:
                i = inst
        if i:
            raise i
    else:
        # program name
        if not ui.quiet:
            rst = [_("Mercurial Distributed SCM\n"), '\n']
        rst.extend(helplist())

    return ''.join(rst)