view doc/gendoc.py @ 42001:624d6683c705

branchmap: remove the dict interface from the branchcache class (API)

The current branchmap computation involves reading the whole branchmap from
disk, validating all the nodes even if they are not required. This leads to a
lot of time on repos which have large branchmap or a lot of branches. On large
repos, this can validate around 1000's of nodes.

On some operations, like finding whether a branch exists or not, we don't need
to validate all the nodes. Or updating heads for a single branch.

Before this patch, branchcache class was having dict interface and it was hard
to keep track of reads.

This patch removes the dict interface. Upcoming patches will implement lazy
loading and validation of data and implement better API's.

Differential Revision: https://phab.mercurial-scm.org/D6151

#!/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]))