gendoc: add showtopic

This function prints any topic.

doc/gendoc.py

@@ -1,160 +1,171 b''
 import os, sys, textwrap
 # import from the live mercurial repo
 sys.path.insert(0, "..")
 # fall back to pure modules if required C extensions are not available
 sys.path.append(os.path.join('..', 'mercurial', 'pure'))
 from mercurial import demandimport; demandimport.enable()
 from mercurial import minirst
 from mercurial.commands import table, globalopts
 from mercurial.i18n import gettext, _
-from mercurial.help import helptable
+from mercurial.help import helptable, loaddoc
 from mercurial import extensions
 from mercurial import util
 
 def get_desc(docstr):
     if not docstr:
         return "", ""
     # sanitize
     docstr = docstr.strip("\n")
     docstr = docstr.rstrip()
     shortdesc = docstr.splitlines()[0].strip()
 
     i = docstr.find("\n")
     if i != -1:
         desc = docstr[i + 2:]
     else:
         desc = shortdesc
 
     desc = textwrap.dedent(desc)
 
     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
         allopts = []
         if shortopt:
             allopts.append("-%s" % shortopt)
         if longopt:
             allopts.append("--%s" % longopt)
         desc += default and _(" (default: %s)") % default or ""
         yield (", ".join(allopts), desc)
 
 def get_cmd(cmd, cmdtable):
     d = {}
     attr = cmdtable[cmd]
     cmds = cmd.lstrip("^").split("|")
 
     d['cmd'] = cmds[0]
     d['aliases'] = cmd.split("|")[1:]
     d['desc'] = get_desc(gettext(attr[0].__doc__))
     d['opts'] = list(get_opts(attr[1]))
 
     s = 'hg ' + cmds[0]
     if len(attr) > 2:
         if not attr[2].startswith('hg'):
             s += ' ' + attr[2]
         else:
             s = attr[2]
     d['synopsis'] = s.strip()
 
     return d
 
 def showdoc(ui):
     # print options
     ui.write(minirst.section(_("Options")))
     for optstr, desc in get_opts(globalopts):
         ui.write("%s\n    %s\n\n" % (optstr, desc))
 
     # print cmds
     ui.write(minirst.section(_("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=['config'])
 
     ui.write(minirst.section(_("Extensions")))
     ui.write(_("This section contains help for extensions that are "
                "distributed together with Mercurial. Help for other "
                "extensions is available in the help system."))
     ui.write("\n\n"
              ".. contents::\n"
              "   :class: htmlonly\n"
              "   :local:\n"
              "   :depth: 1\n\n")
 
     for extensionname in sorted(allextensionnames()):
         mod = extensions.load(None, extensionname, None)
         ui.write(minirst.subsection(extensionname))
         ui.write("%s\n\n" % gettext(mod.__doc__))
         cmdtable = getattr(mod, 'cmdtable', None)
         if cmdtable:
             ui.write(minirst.subsubsection(_('Commands')))
             commandprinter(ui, cmdtable, minirst.subsubsubsection)
 
+def showtopic(ui, topic):
+    extrahelptable = [
+        (["common"], '', loaddoc('common')),
+        (["hg.1"], '', loaddoc('hg.1')),
+        (["hgignore.5"], '', loaddoc('hgignore.5')),
+        (["hgrc.5"], '', loaddoc('hgrc.5')),
+        (["hgignore.5.gendoc"], '', loaddoc('hgignore')),
+        (["hgrc.5.gendoc"], '', loaddoc('config')),
+    ]
+    helpprinter(ui, helptable + extrahelptable, None, include=[topic])
+
 def helpprinter(ui, helptable, sectionfunc, include=[], exclude=[]):
     for names, sec, doc in helptable:
         if exclude and names[0] in exclude:
             continue
         if include and names[0] not in include:
             continue
         for name in names:
             ui.write(".. _%s:\n" % name)
         ui.write("\n")
         if sectionfunc:
             ui.write(sectionfunc(sec))
         if util.safehasattr(doc, '__call__'):
             doc = doc()
         ui.write(doc)
         ui.write("\n")
 
 def commandprinter(ui, cmdtable, sectionfunc):
     h = {}
     for c, attr in cmdtable.items():
         f = c.split("|")[0]
         f = f.lstrip("^")
         h[f] = c
     cmds = h.keys()
     cmds.sort()
 
     for f in cmds:
         if f.startswith("debug"):
             continue
         d = get_cmd(h[f], cmdtable)
         ui.write(sectionfunc(d['cmd']))
         # synopsis
         ui.write("::\n\n")
         synopsislines = d['synopsis'].splitlines()
         for line in synopsislines:
             # some commands (such as rebase) have a multi-line
             # synopsis
             ui.write("   %s\n" % line)
         ui.write('\n')
         # description
         ui.write("%s\n\n" % d['desc'][1])
         # options
         opt_output = list(d['opts'])
         if opt_output:
             opts_len = max([len(line[0]) for line in opt_output])
             ui.write(_("Options:\n\n"))
             for optstr, desc in opt_output:
                 if desc:
                     s = "%-*s  %s" % (opts_len, optstr, desc)
                 else:
                     s = optstr
                 ui.write("%s\n" % s)
             ui.write("\n")
         # aliases
         if d['aliases']:
             ui.write(_("    aliases: %s\n\n") % " ".join(d['aliases']))
 
 
 def allextensionnames():
     return extensions.enabled().keys() + extensions.disabled().keys()
 
 if __name__ == "__main__":
     showdoc(sys.stdout)