doc: show details of command options in pages generated by docutils

Before this patch, HTML/man pages generated by docutils don't show
details of each command options, whether it should take argument or
not for example, even though "hg help" does.

This patch shows details of command options as same as "hg help"
shows.

This patch uses "--option <VALUE[+]>" style instead of "--option
<VALUE> [+]" used in output of "hg help", because docutils requires
that option argument strings starts with "<" and ends with ">".

doc/gendoc.py

@@ -40,11 +40,16 b' def get_opts(opts):'
             shortopt, longopt, default, desc, optlabel = opt
         else:
             shortopt, longopt, default, desc = opt
+            optlabel = _("VALUE")
         allopts = []
         if shortopt:
             allopts.append("-%s" % shortopt)
         if longopt:
             allopts.append("--%s" % longopt)
+        if isinstance(default, list):
+            allopts[-1] += " <%s[+]>" % optlabel
+        elif (default is not None) and not isinstance(default, bool):
+            allopts[-1] += " <%s>" % optlabel
         desc += default and _(" (default: %s)") % default or ""
         yield (", ".join(allopts), desc)
 
@@ -71,8 +76,14 b' def get_cmd(cmd, cmdtable):'
 def showdoc(ui):
     # print options
     ui.write(minirst.section(_("Options")))
+    multioccur = False
     for optstr, desc in get_opts(globalopts):
         ui.write("%s\n    %s\n\n" % (optstr, desc))
+        if optstr.endswith("[+]>"):
+            multioccur = True
+    if multioccur:
+        ui.write(_("\n[+] marked option can be specified multiple times\n"))
+        ui.write("\n")
 
     # print cmds
     ui.write(minirst.section(_("Commands")))
@@ -157,12 +168,18 b' def commandprinter(ui, cmdtable, section'
         if opt_output:
             opts_len = max([len(line[0]) for line in opt_output])
             ui.write(_("Options:\n\n"))
+            multioccur = False
             for optstr, desc in opt_output:
                 if desc:
                     s = "%-*s  %s" % (opts_len, optstr, desc)
                 else:
                     s = optstr
                 ui.write("%s\n" % s)
+                if optstr.endswith("[+]>"):
+                    multioccur = True
+            if multioccur:
+                ui.write(_("\n[+] marked option can be specified"
+                           " multiple times\n"))
             ui.write("\n")
         # aliases
         if d['aliases']: