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5c136c2209
The Mercurial wire protocol is under-documented. This includes a lack of source docstrings and comments as well as pages on the official wiki. This patch adds the beginnings of "internals" documentation on the wire protocol. The documentation should have nearly complete coverage on the lower-level parts of the protocol, such as the different transport mechanims, how commands and arguments are sent, capabilities, and, of course, the commands themselves. As part of writing this documentation, I discovered a number of deficiencies in the protocol and bugs in the implementation. I've started sending patches for some of the issues. I hope to send a lot more. This patch starts with the scaffolding for a new internals page.
610 lines
21 KiB
Python
610 lines
21 KiB
Python
# help.py - help data for mercurial
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#
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# Copyright 2006 Matt Mackall <mpm@selenic.com>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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from __future__ import absolute_import
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import itertools
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import os
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import textwrap
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from .i18n import (
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_,
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gettext,
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)
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from . import (
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cmdutil,
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encoding,
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error,
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extensions,
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filemerge,
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fileset,
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minirst,
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revset,
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templatefilters,
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templatekw,
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templater,
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util,
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)
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from .hgweb import (
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webcommands,
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)
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_exclkeywords = [
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"(DEPRECATED)",
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"(EXPERIMENTAL)",
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# i18n: "(DEPRECATED)" is a keyword, must be translated consistently
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_("(DEPRECATED)"),
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# i18n: "(EXPERIMENTAL)" is a keyword, must be translated consistently
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_("(EXPERIMENTAL)"),
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]
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def listexts(header, exts, indent=1, showdeprecated=False):
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'''return a text listing of the given extensions'''
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rst = []
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if exts:
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for name, desc in sorted(exts.iteritems()):
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if not showdeprecated and any(w in desc for w in _exclkeywords):
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continue
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rst.append('%s:%s: %s\n' % (' ' * indent, name, desc))
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if rst:
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rst.insert(0, '\n%s\n\n' % header)
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return rst
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def extshelp(ui):
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rst = loaddoc('extensions')(ui).splitlines(True)
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rst.extend(listexts(
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_('enabled extensions:'), extensions.enabled(), showdeprecated=True))
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rst.extend(listexts(_('disabled extensions:'), extensions.disabled()))
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doc = ''.join(rst)
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return doc
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def optrst(header, options, verbose):
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data = []
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multioccur = False
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for option in options:
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if len(option) == 5:
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shortopt, longopt, default, desc, optlabel = option
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else:
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shortopt, longopt, default, desc = option
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optlabel = _("VALUE") # default label
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if not verbose and any(w in desc for w in _exclkeywords):
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continue
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so = ''
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if shortopt:
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so = '-' + shortopt
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lo = '--' + longopt
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if default:
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desc += _(" (default: %s)") % default
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if isinstance(default, list):
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lo += " %s [+]" % optlabel
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multioccur = True
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elif (default is not None) and not isinstance(default, bool):
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lo += " %s" % optlabel
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data.append((so, lo, desc))
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if multioccur:
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header += (_(" ([+] can be repeated)"))
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rst = ['\n%s:\n\n' % header]
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rst.extend(minirst.maketable(data, 1))
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return ''.join(rst)
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def indicateomitted(rst, omitted, notomitted=None):
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rst.append('\n\n.. container:: omitted\n\n %s\n\n' % omitted)
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if notomitted:
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rst.append('\n\n.. container:: notomitted\n\n %s\n\n' % notomitted)
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def filtercmd(ui, cmd, kw, doc):
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if not ui.debugflag and cmd.startswith("debug") and kw != "debug":
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return True
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if not ui.verbose and doc and any(w in doc for w in _exclkeywords):
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return True
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return False
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def topicmatch(ui, kw):
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"""Return help topics matching kw.
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Returns {'section': [(name, summary), ...], ...} where section is
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one of topics, commands, extensions, or extensioncommands.
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"""
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kw = encoding.lower(kw)
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def lowercontains(container):
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return kw in encoding.lower(container) # translated in helptable
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results = {'topics': [],
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'commands': [],
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'extensions': [],
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'extensioncommands': [],
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}
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for names, header, doc in helptable:
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# Old extensions may use a str as doc.
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if (sum(map(lowercontains, names))
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or lowercontains(header)
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or (callable(doc) and lowercontains(doc(ui)))):
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results['topics'].append((names[0], header))
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from . import commands # avoid cycle
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for cmd, entry in commands.table.iteritems():
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if len(entry) == 3:
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summary = entry[2]
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else:
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summary = ''
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# translate docs *before* searching there
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docs = _(getattr(entry[0], '__doc__', None)) or ''
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if kw in cmd or lowercontains(summary) or lowercontains(docs):
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doclines = docs.splitlines()
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if doclines:
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summary = doclines[0]
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cmdname = cmd.partition('|')[0].lstrip('^')
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if filtercmd(ui, cmdname, kw, docs):
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continue
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results['commands'].append((cmdname, summary))
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for name, docs in itertools.chain(
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extensions.enabled(False).iteritems(),
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extensions.disabled().iteritems()):
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if not docs:
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continue
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mod = extensions.load(ui, name, '')
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name = name.rpartition('.')[-1]
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if lowercontains(name) or lowercontains(docs):
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# extension docs are already translated
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results['extensions'].append((name, docs.splitlines()[0]))
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for cmd, entry in getattr(mod, 'cmdtable', {}).iteritems():
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if kw in cmd or (len(entry) > 2 and lowercontains(entry[2])):
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cmdname = cmd.partition('|')[0].lstrip('^')
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if entry[0].__doc__:
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cmddoc = gettext(entry[0].__doc__).splitlines()[0]
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else:
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cmddoc = _('(no help text available)')
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if filtercmd(ui, cmdname, kw, cmddoc):
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continue
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results['extensioncommands'].append((cmdname, cmddoc))
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return results
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def loaddoc(topic, subdir=None):
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"""Return a delayed loader for help/topic.txt."""
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def loader(ui):
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docdir = os.path.join(util.datapath, 'help')
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if subdir:
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docdir = os.path.join(docdir, subdir)
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path = os.path.join(docdir, topic + ".txt")
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doc = gettext(util.readfile(path))
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for rewriter in helphooks.get(topic, []):
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doc = rewriter(ui, topic, doc)
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return doc
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return loader
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internalstable = sorted([
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(['bundles'], _('Bundles'),
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loaddoc('bundles', subdir='internals')),
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(['changegroups'], _('Changegroups'),
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loaddoc('changegroups', subdir='internals')),
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(['requirements'], _('Repository Requirements'),
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loaddoc('requirements', subdir='internals')),
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(['revlogs'], _('Revision Logs'),
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loaddoc('revlogs', subdir='internals')),
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(['wireprotocol'], _('Wire Protocol'),
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loaddoc('wireprotocol', subdir='internals')),
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])
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def internalshelp(ui):
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"""Generate the index for the "internals" topic."""
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lines = []
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for names, header, doc in internalstable:
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lines.append(' :%s: %s\n' % (names[0], header))
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return ''.join(lines)
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helptable = sorted([
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(["config", "hgrc"], _("Configuration Files"), loaddoc('config')),
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(["dates"], _("Date Formats"), loaddoc('dates')),
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(["patterns"], _("File Name Patterns"), loaddoc('patterns')),
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(['environment', 'env'], _('Environment Variables'),
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loaddoc('environment')),
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(['revisions', 'revs'], _('Specifying Single Revisions'),
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loaddoc('revisions')),
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(['multirevs', 'mrevs'], _('Specifying Multiple Revisions'),
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loaddoc('multirevs')),
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(['revsets', 'revset'], _("Specifying Revision Sets"), loaddoc('revsets')),
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(['filesets', 'fileset'], _("Specifying File Sets"), loaddoc('filesets')),
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(['diffs'], _('Diff Formats'), loaddoc('diffs')),
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(['merge-tools', 'mergetools'], _('Merge Tools'), loaddoc('merge-tools')),
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(['templating', 'templates', 'template', 'style'], _('Template Usage'),
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loaddoc('templates')),
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(['urls'], _('URL Paths'), loaddoc('urls')),
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(["extensions"], _("Using Additional Features"), extshelp),
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(["subrepos", "subrepo"], _("Subrepositories"), loaddoc('subrepos')),
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(["hgweb"], _("Configuring hgweb"), loaddoc('hgweb')),
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(["glossary"], _("Glossary"), loaddoc('glossary')),
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(["hgignore", "ignore"], _("Syntax for Mercurial Ignore Files"),
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loaddoc('hgignore')),
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(["phases"], _("Working with Phases"), loaddoc('phases')),
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(['scripting'], _('Using Mercurial from scripts and automation'),
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loaddoc('scripting')),
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(['internals'], _("Technical implementation topics"),
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internalshelp),
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])
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# Maps topics with sub-topics to a list of their sub-topics.
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subtopics = {
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'internals': internalstable,
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}
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# Map topics to lists of callable taking the current topic help and
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# returning the updated version
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helphooks = {}
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def addtopichook(topic, rewriter):
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helphooks.setdefault(topic, []).append(rewriter)
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def makeitemsdoc(ui, topic, doc, marker, items, dedent=False):
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"""Extract docstring from the items key to function mapping, build a
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single documentation block and use it to overwrite the marker in doc.
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"""
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entries = []
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for name in sorted(items):
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text = (items[name].__doc__ or '').rstrip()
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if (not text
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or not ui.verbose and any(w in text for w in _exclkeywords)):
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continue
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text = gettext(text)
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if dedent:
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text = textwrap.dedent(text)
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lines = text.splitlines()
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doclines = [(lines[0])]
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for l in lines[1:]:
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# Stop once we find some Python doctest
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if l.strip().startswith('>>>'):
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break
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if dedent:
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doclines.append(l.rstrip())
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else:
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doclines.append(' ' + l.strip())
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entries.append('\n'.join(doclines))
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entries = '\n\n'.join(entries)
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return doc.replace(marker, entries)
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def addtopicsymbols(topic, marker, symbols, dedent=False):
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def add(ui, topic, doc):
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return makeitemsdoc(ui, topic, doc, marker, symbols, dedent=dedent)
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addtopichook(topic, add)
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addtopicsymbols('filesets', '.. predicatesmarker', fileset.symbols)
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addtopicsymbols('merge-tools', '.. internaltoolsmarker',
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filemerge.internalsdoc)
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addtopicsymbols('revsets', '.. predicatesmarker', revset.symbols)
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addtopicsymbols('templates', '.. keywordsmarker', templatekw.keywords)
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addtopicsymbols('templates', '.. filtersmarker', templatefilters.filters)
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addtopicsymbols('templates', '.. functionsmarker', templater.funcs)
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addtopicsymbols('hgweb', '.. webcommandsmarker', webcommands.commands,
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dedent=True)
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def help_(ui, name, unknowncmd=False, full=True, subtopic=None, **opts):
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'''
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Generate the help for 'name' as unformatted restructured text. If
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'name' is None, describe the commands available.
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'''
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from . import commands # avoid cycle
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def helpcmd(name, subtopic=None):
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try:
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aliases, entry = cmdutil.findcmd(name, commands.table,
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strict=unknowncmd)
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except error.AmbiguousCommand as inst:
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# py3k fix: except vars can't be used outside the scope of the
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# except block, nor can be used inside a lambda. python issue4617
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prefix = inst.args[0]
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select = lambda c: c.lstrip('^').startswith(prefix)
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rst = helplist(select)
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return rst
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rst = []
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# check if it's an invalid alias and display its error if it is
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if getattr(entry[0], 'badalias', None):
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rst.append(entry[0].badalias + '\n')
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if entry[0].unknowncmd:
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try:
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rst.extend(helpextcmd(entry[0].cmdname))
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except error.UnknownCommand:
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pass
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return rst
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# synopsis
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if len(entry) > 2:
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if entry[2].startswith('hg'):
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rst.append("%s\n" % entry[2])
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else:
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rst.append('hg %s %s\n' % (aliases[0], entry[2]))
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else:
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rst.append('hg %s\n' % aliases[0])
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# aliases
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if full and not ui.quiet and len(aliases) > 1:
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rst.append(_("\naliases: %s\n") % ', '.join(aliases[1:]))
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rst.append('\n')
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# description
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doc = gettext(entry[0].__doc__)
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if not doc:
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doc = _("(no help text available)")
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if util.safehasattr(entry[0], 'definition'): # aliased command
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source = entry[0].source
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if entry[0].definition.startswith('!'): # shell alias
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doc = (_('shell alias for::\n\n %s\n\ndefined by: %s\n') %
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(entry[0].definition[1:], source))
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else:
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doc = (_('alias for: hg %s\n\n%s\n\ndefined by: %s\n') %
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(entry[0].definition, doc, source))
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doc = doc.splitlines(True)
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if ui.quiet or not full:
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rst.append(doc[0])
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else:
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rst.extend(doc)
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rst.append('\n')
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# check if this command shadows a non-trivial (multi-line)
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# extension help text
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try:
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mod = extensions.find(name)
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doc = gettext(mod.__doc__) or ''
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if '\n' in doc.strip():
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msg = _('(use "hg help -e %s" to show help for '
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'the %s extension)') % (name, name)
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rst.append('\n%s\n' % msg)
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except KeyError:
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pass
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# options
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if not ui.quiet and entry[1]:
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rst.append(optrst(_("options"), entry[1], ui.verbose))
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if ui.verbose:
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rst.append(optrst(_("global options"),
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commands.globalopts, ui.verbose))
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if not ui.verbose:
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if not full:
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rst.append(_('\n(use "hg %s -h" to show more help)\n')
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% name)
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elif not ui.quiet:
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rst.append(_('\n(some details hidden, use --verbose '
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'to show complete help)'))
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return rst
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def helplist(select=None, **opts):
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# list of commands
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if name == "shortlist":
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header = _('basic commands:\n\n')
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elif name == "debug":
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header = _('debug commands (internal and unsupported):\n\n')
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else:
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header = _('list of commands:\n\n')
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h = {}
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cmds = {}
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for c, e in commands.table.iteritems():
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f = c.partition("|")[0]
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if select and not select(f):
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continue
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if (not select and name != 'shortlist' and
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e[0].__module__ != commands.__name__):
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continue
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if name == "shortlist" and not f.startswith("^"):
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continue
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f = f.lstrip("^")
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doc = e[0].__doc__
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if filtercmd(ui, f, name, doc):
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continue
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doc = gettext(doc)
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if not doc:
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doc = _("(no help text available)")
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h[f] = doc.splitlines()[0].rstrip()
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cmds[f] = c.lstrip("^")
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rst = []
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if not h:
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if not ui.quiet:
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rst.append(_('no commands defined\n'))
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return rst
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if not ui.quiet:
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rst.append(header)
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fns = sorted(h)
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for f in fns:
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if ui.verbose:
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commacmds = cmds[f].replace("|",", ")
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rst.append(" :%s: %s\n" % (commacmds, h[f]))
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else:
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rst.append(' :%s: %s\n' % (f, h[f]))
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ex = opts.get
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anyopts = (ex('keyword') or not (ex('command') or ex('extension')))
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if not name and anyopts:
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exts = listexts(_('enabled extensions:'), extensions.enabled())
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if exts:
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rst.append('\n')
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rst.extend(exts)
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rst.append(_("\nadditional help topics:\n\n"))
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topics = []
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for names, header, doc in helptable:
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topics.append((names[0], header))
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for t, desc in topics:
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rst.append(" :%s: %s\n" % (t, desc))
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if ui.quiet:
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pass
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elif ui.verbose:
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rst.append('\n%s\n' % optrst(_("global options"),
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commands.globalopts, ui.verbose))
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if name == 'shortlist':
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rst.append(_('\n(use "hg help" for the full list '
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'of commands)\n'))
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else:
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if name == 'shortlist':
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rst.append(_('\n(use "hg help" for the full list of commands '
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'or "hg -v" for details)\n'))
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elif name and not full:
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rst.append(_('\n(use "hg help %s" to show the full help '
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'text)\n') % name)
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elif name and cmds and name in cmds.keys():
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rst.append(_('\n(use "hg help -v -e %s" to show built-in '
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'aliases and global options)\n') % name)
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else:
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rst.append(_('\n(use "hg help -v%s" to show built-in aliases '
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'and global options)\n')
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% (name and " " + name or ""))
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return rst
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def helptopic(name, subtopic=None):
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# Look for sub-topic entry first.
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header, doc = None, None
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if subtopic and name in subtopics:
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for names, header, doc in subtopics[name]:
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if subtopic in names:
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break
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if not header:
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for names, header, doc in helptable:
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if name in names:
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break
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else:
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raise error.UnknownCommand(name)
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rst = [minirst.section(header)]
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# description
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if not doc:
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rst.append(" %s\n" % _("(no help text available)"))
|
|
if callable(doc):
|
|
rst += [" %s\n" % l for l in doc(ui).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, subtopic=None):
|
|
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.rpartition('.')[-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.partition('|')[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, subtopic=None):
|
|
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,
|
|
showdeprecated=True)
|
|
rst.append('\n')
|
|
rst.append(_('(use "hg help extensions" for information on enabling '
|
|
'extensions)\n'))
|
|
return rst
|
|
|
|
|
|
rst = []
|
|
kw = opts.get('keyword')
|
|
if kw or name is None and any(opts[o] for o in opts):
|
|
matches = topicmatch(ui, name or '')
|
|
helpareas = []
|
|
if opts.get('extension'):
|
|
helpareas += [('extensions', _('Extensions'))]
|
|
if opts.get('command'):
|
|
helpareas += [('commands', _('Commands'))]
|
|
if not helpareas:
|
|
helpareas = [('topics', _('Topics')),
|
|
('commands', _('Commands')),
|
|
('extensions', _('Extensions')),
|
|
('extensioncommands', _('Extension Commands'))]
|
|
for t, title in helpareas:
|
|
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 error.Abort(msg, hint=hint)
|
|
elif name and name != 'shortlist':
|
|
queries = []
|
|
if unknowncmd:
|
|
queries += [helpextcmd]
|
|
if opts.get('extension'):
|
|
queries += [helpext]
|
|
if opts.get('command'):
|
|
queries += [helpcmd]
|
|
if not queries:
|
|
queries = (helptopic, helpcmd, helpext, helpextcmd)
|
|
for f in queries:
|
|
try:
|
|
rst = f(name, subtopic)
|
|
break
|
|
except error.UnknownCommand:
|
|
pass
|
|
else:
|
|
if unknowncmd:
|
|
raise error.UnknownCommand(name)
|
|
else:
|
|
msg = _('no such help topic: %s') % name
|
|
hint = _('try "hg help --keyword %s"') % name
|
|
raise error.Abort(msg, hint=hint)
|
|
else:
|
|
# program name
|
|
if not ui.quiet:
|
|
rst = [_("Mercurial Distributed SCM\n"), '\n']
|
|
rst.extend(helplist(None, **opts))
|
|
|
|
return ''.join(rst)
|