doc/gendoc.py

shelve: stop passing list of files to revert

It seems to work just fine to not specify any files here. I suspect it
looked the way it did for historical reasons. It apparently used to
use merge instead of rebase until 1d7a36ff2615 (shelve: use rebase
instead of merge (issue4068), 2013-10-23) and it makes sense to want
to restrict the set of files then.

I noticed this because of the files.extend(shelvectx.p1().files()). If
the working copy was clean before, then shelvectx.p1() will be the
working copy parent and that ended up adding all the files in that
set. In our Google-internal Mercurial setup (including a FUSE) that
was very noticeably slow when the working copy parent happened to have
many files in large directories.

This patch doesn't yet remove the call to shelvectx.p1().files(). We
also use that set for deciding what to back up. I'm pretty sure it's
safe to back up only the set of files we already back even if we no
longer restrict the set of files to revert, so this patch should be
safe on its own. Regardless, the next patch will delegate the
backing-up to cmdutil.revert().

Incidentally, this also gets rid of a repo.pathto() that I had earlier
wanted to get rid of.

Differential Revision: https://phab.mercurial-scm.org/D6173

#!/usr/bin/env python
"""usage: %s DOC ...

where DOC is the name of a document
"""

from __future__ import absolute_import

import os
import sys
import textwrap

try:
    import msvcrt
    msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)
    msvcrt.setmode(sys.stderr.fileno(), os.O_BINARY)
except ImportError:
    pass

# This script is executed during installs and may not have C extensions
# available. Relax C module requirements.
os.environ[r'HGMODULEPOLICY'] = r'allow'
# import from the live mercurial repo
sys.path.insert(0, r"..")
from mercurial import demandimport; demandimport.enable()
# Load util so that the locale path is set by i18n.setdatapath() before
# calling _().
from mercurial import util
util.datapath
from mercurial import (
    commands,
    encoding,
    extensions,
    help,
    minirst,
    pycompat,
    ui as uimod,
)
from mercurial.i18n import (
    gettext,
    _,
)

table = commands.table
globalopts = commands.globalopts
helptable = help.helptable
loaddoc = help.loaddoc

def get_desc(docstr):
    if not docstr:
        return b"", b""
    # sanitize
    docstr = docstr.strip(b"\n")
    docstr = docstr.rstrip()
    shortdesc = docstr.splitlines()[0].strip()

    i = docstr.find(b"\n")
    if i != -1:
        desc = docstr[i + 2:]
    else:
        desc = shortdesc

    desc = textwrap.dedent(desc.decode('latin1')).encode('latin1')

    return (shortdesc, desc)

def get_opts(opts):
    for opt in opts:
        if len(opt) == 5:
            shortopt, longopt, default, desc, optlabel = opt
        else:
            shortopt, longopt, default, desc = opt
            optlabel = _(b"VALUE")
        allopts = []
        if shortopt:
            allopts.append(b"-%s" % shortopt)
        if longopt:
            allopts.append(b"--%s" % longopt)
        if isinstance(default, list):
            allopts[-1] += b" <%s[+]>" % optlabel
        elif (default is not None) and not isinstance(default, bool):
            allopts[-1] += b" <%s>" % optlabel
        if b'\n' in desc:
            # only remove line breaks and indentation
            desc = b' '.join(l.lstrip() for l in desc.split(b'\n'))
        desc += default and _(b" (default: %s)") % bytes(default) or b""
        yield (b", ".join(allopts), desc)

def get_cmd(cmd, cmdtable):
    d = {}
    attr = cmdtable[cmd]
    cmds = cmd.lstrip(b"^").split(b"|")

    d[b'cmd'] = cmds[0]
    d[b'aliases'] = cmd.split(b"|")[1:]
    d[b'desc'] = get_desc(gettext(pycompat.getdoc(attr[0])))
    d[b'opts'] = list(get_opts(attr[1]))

    s = b'hg ' + cmds[0]
    if len(attr) > 2:
        if not attr[2].startswith(b'hg'):
            s += b' ' + attr[2]
        else:
            s = attr[2]
    d[b'synopsis'] = s.strip()

    return d

def showdoc(ui):
    # print options
    ui.write(minirst.section(_(b"Options")))
    multioccur = False
    for optstr, desc in get_opts(globalopts):
        ui.write(b"%s\n    %s\n\n" % (optstr, desc))
        if optstr.endswith(b"[+]>"):
            multioccur = True
    if multioccur:
        ui.write(_(b"\n[+] marked option can be specified multiple times\n"))
        ui.write(b"\n")

    # print cmds
    ui.write(minirst.section(_(b"Commands")))
    commandprinter(ui, table, minirst.subsection)

    # print help topics
    # The config help topic is included in the hgrc.5 man page.
    helpprinter(ui, helptable, minirst.section, exclude=[b'config'])

    ui.write(minirst.section(_(b"Extensions")))
    ui.write(_(b"This section contains help for extensions that are "
               b"distributed together with Mercurial. Help for other "
               b"extensions is available in the help system."))
    ui.write((b"\n\n"
              b".. contents::\n"
              b"   :class: htmlonly\n"
              b"   :local:\n"
              b"   :depth: 1\n\n"))

    for extensionname in sorted(allextensionnames()):
        mod = extensions.load(ui, extensionname, None)
        ui.write(minirst.subsection(extensionname))
        ui.write(b"%s\n\n" % gettext(pycompat.getdoc(mod)))
        cmdtable = getattr(mod, 'cmdtable', None)
        if cmdtable:
            ui.write(minirst.subsubsection(_(b'Commands')))
            commandprinter(ui, cmdtable, minirst.subsubsubsection)

def showtopic(ui, topic):
    extrahelptable = [
        ([b"common"], b'', loaddoc(b'common'), help.TOPIC_CATEGORY_MISC),
        ([b"hg.1"], b'', loaddoc(b'hg.1'), help.TOPIC_CATEGORY_CONFIG),
        ([b"hg-ssh.8"], b'', loaddoc(b'hg-ssh.8'), help.TOPIC_CATEGORY_CONFIG),
        ([b"hgignore.5"], b'', loaddoc(b'hgignore.5'),
         help.TOPIC_CATEGORY_CONFIG),
        ([b"hgrc.5"], b'', loaddoc(b'hgrc.5'), help.TOPIC_CATEGORY_CONFIG),
        ([b"hgignore.5.gendoc"], b'', loaddoc(b'hgignore'),
         help.TOPIC_CATEGORY_CONFIG),
        ([b"hgrc.5.gendoc"], b'', loaddoc(b'config'),
         help.TOPIC_CATEGORY_CONFIG),
    ]
    helpprinter(ui, helptable + extrahelptable, None, include=[topic])

def helpprinter(ui, helptable, sectionfunc, include=[], exclude=[]):
    for h in helptable:
        names, sec, doc = h[0:3]
        if exclude and names[0] in exclude:
            continue
        if include and names[0] not in include:
            continue
        for name in names:
            ui.write(b".. _%s:\n" % name)
        ui.write(b"\n")
        if sectionfunc:
            ui.write(sectionfunc(sec))
        if callable(doc):
            doc = doc(ui)
        ui.write(doc)
        ui.write(b"\n")

def commandprinter(ui, cmdtable, sectionfunc):
    h = {}
    for c, attr in cmdtable.items():
        f = c.split(b"|")[0]
        f = f.lstrip(b"^")
        h[f] = c
    cmds = h.keys()

    for f in sorted(cmds):
        if f.startswith(b"debug"):
            continue
        d = get_cmd(h[f], cmdtable)
        ui.write(sectionfunc(d[b'cmd']))
        # short description
        ui.write(d[b'desc'][0])
        # synopsis
        ui.write(b"::\n\n")
        synopsislines = d[b'synopsis'].splitlines()
        for line in synopsislines:
            # some commands (such as rebase) have a multi-line
            # synopsis
            ui.write(b"   %s\n" % line)
        ui.write(b'\n')
        # description
        ui.write(b"%s\n\n" % d[b'desc'][1])
        # options
        opt_output = list(d[b'opts'])
        if opt_output:
            opts_len = max([len(line[0]) for line in opt_output])
            ui.write(_(b"Options:\n\n"))
            multioccur = False
            for optstr, desc in opt_output:
                if desc:
                    s = b"%-*s  %s" % (opts_len, optstr, desc)
                else:
                    s = optstr
                ui.write(b"%s\n" % s)
                if optstr.endswith(b"[+]>"):
                    multioccur = True
            if multioccur:
                ui.write(_(b"\n[+] marked option can be specified"
                           b" multiple times\n"))
            ui.write(b"\n")
        # aliases
        if d[b'aliases']:
            ui.write(_(b"    aliases: %s\n\n") % b" ".join(d[b'aliases']))


def allextensionnames():
    return set(extensions.enabled().keys()) | set(extensions.disabled().keys())

if __name__ == "__main__":
    doc = b'hg.1.gendoc'
    if len(sys.argv) > 1:
        doc = encoding.strtolocal(sys.argv[1])

    ui = uimod.ui.load()
    if doc == b'hg.1.gendoc':
        showdoc(ui)
    else:
        showtopic(ui, encoding.strtolocal(sys.argv[1]))