internals: document bundle2 format
It seems like a good idea to have thorough documentation of the bundle2
data format, including the format of each part and the capabilities.
The added documentation is far from complete. For example, we don't
fully capture the semantics of each capability and part. But a start
is better than nothing, which was pretty much where we were before.
Differential Revision: https://phab.mercurial-scm.org/D2298
# 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,
pycompat,
revset,
templatefilters,
templatekw,
templater,
util,
)
from .hgweb import (
webcommands,
)
_exclkeywords = {
"(ADVANCED)",
"(DEPRECATED)",
"(EXPERIMENTAL)",
# i18n: "(ADVANCED)" is a keyword, must be translated consistently
_("(ADVANCED)"),
# 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(),
showdeprecated=ui.verbose))
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:
# default is of unknown type, and in Python 2 we abused
# the %s-shows-repr property to handle integers etc. To
# match that behavior on Python 3, we do str(default) and
# then convert it to bytes.
desc += _(" (default: %s)") % pycompat.bytestr(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, commands, 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))
for cmd, entry in commands.table.iteritems():
if len(entry) == 3:
summary = entry[2]
else:
summary = ''
# translate docs *before* searching there
docs = _(pycompat.getdoc(entry[0])) or ''
if kw in cmd or lowercontains(summary) or lowercontains(docs):
doclines = docs.splitlines()
if doclines:
summary = doclines[0]
cmdname = cmdutil.parsealiases(cmd)[0]
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
name = name.rpartition('.')[-1]
if lowercontains(name) or lowercontains(docs):
# extension docs are already translated
results['extensions'].append((name, docs.splitlines()[0]))
try:
mod = extensions.load(ui, name, '')
except ImportError:
# debug message would be printed in extensions.load()
continue
for cmd, entry in getattr(mod, 'cmdtable', {}).iteritems():
if kw in cmd or (len(entry) > 2 and lowercontains(entry[2])):
cmdname = cmdutil.parsealiases(cmd)[0]
cmddoc = pycompat.getdoc(entry[0])
if cmddoc:
cmddoc = gettext(cmddoc).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([
(['bundle2'], _('Bundle2'),
loaddoc('bundle2', subdir='internals')),
(['bundles'], _('Bundles'),
loaddoc('bundles', subdir='internals')),
(['censor'], _('Censor'),
loaddoc('censor', subdir='internals')),
(['changegroups'], _('Changegroups'),
loaddoc('changegroups', subdir='internals')),
(['config'], _('Config Registrar'),
loaddoc('config', 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 = ['To access a subtopic, use "hg help internals.{subtopic-name}"\n',
'\n']
for names, header, doc in internalstable:
lines.append(' :%s: %s\n' % (names[0], header))
return ''.join(lines)
helptable = sorted([
(['bundlespec'], _("Bundle File Formats"), loaddoc('bundlespec')),
(['color'], _("Colorizing Outputs"), loaddoc('color')),
(["config", "hgrc"], _("Configuration Files"), loaddoc('config')),
(["dates"], _("Date Formats"), loaddoc('dates')),
(["flags"], _("Command-line flags"), loaddoc('flags')),
(["patterns"], _("File Name Patterns"), loaddoc('patterns')),
(['environment', 'env'], _('Environment Variables'),
loaddoc('environment')),
(['revisions', 'revs', 'revsets', 'revset', 'multirevs', 'mrevs'],
_('Specifying Revisions'), loaddoc('revisions')),
(['filesets', 'fileset'], _("Specifying File Sets"), loaddoc('filesets')),
(['diffs'], _('Diff Formats'), loaddoc('diffs')),
(['merge-tools', 'mergetools', 'mergetool'], _('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),
(['pager'], _("Pager Support"), loaddoc('pager')),
])
# 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 = (pycompat.getdoc(items[name]) or '').rstrip()
if (not text
or not ui.verbose and any(w in text for w in _exclkeywords)):
continue
text = gettext(text)
if dedent:
# Abuse latin1 to use textwrap.dedent() on bytes.
text = textwrap.dedent(text.decode('latin1')).encode('latin1')
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('bundlespec', '.. bundlecompressionmarker',
util.bundlecompressiontopics())
addtopicsymbols('filesets', '.. predicatesmarker', fileset.symbols)
addtopicsymbols('merge-tools', '.. internaltoolsmarker',
filemerge.internalsdoc)
addtopicsymbols('revisions', '.. 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, commands, 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.
'''
opts = pycompat.byteskwargs(opts)
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: cmdutil.parsealiases(c)[0].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(pycompat.getdoc(entry[0]))
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')
# check if this command shadows a non-trivial (multi-line)
# extension help text
try:
mod = extensions.find(name)
doc = gettext(pycompat.getdoc(mod)) 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, **opts):
# 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():
fs = cmdutil.parsealiases(c)
f = fs[0]
p = ''
if c.startswith("^"):
p = '^'
if select and not select(p + f):
continue
if (not select and name != 'shortlist' and
e[0].__module__ != commands.__name__):
continue
if name == "shortlist" and not p:
continue
doc = pycompat.getdoc(e[0])
if filtercmd(ui, f, name, doc):
continue
doc = gettext(doc)
if not doc:
doc = _("(no help text available)")
h[f] = doc.splitlines()[0].rstrip()
cmds[f] = '|'.join(fs)
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]))
ex = opts.get
anyopts = (ex(r'keyword') or not (ex(r'command') or ex(r'extension')))
if not name and anyopts:
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, subtopic=None):
# Look for sub-topic entry first.
header, doc = None, None
if subtopic and name in subtopics:
for names, header, doc in subtopics[name]:
if subtopic in names:
break
if not header:
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(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(pycompat.getdoc(mod)) 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(pycompat.getdoc(mod)).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, commands, 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, **pycompat.strkwargs(opts)))
return ''.join(rst)
def formattedhelp(ui, commands, name, keep=None, unknowncmd=False, full=True,
**opts):
"""get help for a given topic (as a dotted name) as rendered rst
Either returns the rendered help text or raises an exception.
"""
if keep is None:
keep = []
else:
keep = list(keep) # make a copy so we can mutate this later
fullname = name
section = None
subtopic = None
if name and '.' in name:
name, remaining = name.split('.', 1)
remaining = encoding.lower(remaining)
if '.' in remaining:
subtopic, section = remaining.split('.', 1)
else:
if name in subtopics:
subtopic = remaining
else:
section = remaining
textwidth = ui.configint('ui', 'textwidth')
termwidth = ui.termwidth() - 2
if textwidth <= 0 or termwidth < textwidth:
textwidth = termwidth
text = help_(ui, commands, name,
subtopic=subtopic, unknowncmd=unknowncmd, full=full, **opts)
formatted, pruned = minirst.format(text, textwidth, keep=keep,
section=section)
# We could have been given a weird ".foo" section without a name
# to look for, or we could have simply failed to found "foo.bar"
# because bar isn't a section of foo
if section and not (formatted and name):
raise error.Abort(_("help section not found: %s") % fullname)
if 'verbose' in pruned:
keep.append('omitted')
else:
keep.append('notomitted')
formatted, pruned = minirst.format(text, textwidth, keep=keep,
section=section)
return formatted