help: hide command line options marked as "advanced"

Previously, we have keywords like "(DEPRECATED)" and "(EXPERIMENTAL)" to
hide command line options in non-verbose help output.

However, sometimes an option is neither deprecated nor experimental. It's
well-tested and working, but just not designed to average users. This patch
adds a keyword "(ADVANCED)" to fit in such use cases.

Thanks rom1dep for the suggestion of the word "advanced".

mercurial/help.py

@@ -33,14 +33,17 b' from .hgweb import ('
     webcommands,
 )
 
-_exclkeywords = [
+_exclkeywords = set([
+    "(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'''

tests/test-help.t

@@ -683,6 +683,7 b' this is a section and erroring out weird'
   >     ('', 'newline', '', 'line1\nline2')],
   >     'hg nohelp',
   >     norepo=True)
+  > @command('debugoptADV', [('', 'aopt', None, 'option is (ADVANCED)')])
   > @command('debugoptDEP', [('', 'dopt', None, 'option is (DEPRECATED)')])
   > @command('debugoptEXP', [('', 'eopt', None, 'option is (EXPERIMENTAL)')])
   > def nohelp(ui, *args, **kwargs):
@@ -895,6 +896,7 b' Test list of internal help commands'
                  complete "names" - tags, open branch names, bookmark names
    debugobsolete
                  create arbitrary obsolete marker
+   debugoptADV   (no help text available)
    debugoptDEP   (no help text available)
    debugoptEXP   (no help text available)
    debugpathcomplete
@@ -1108,7 +1110,15 b' Test list of commands with command with '
   (use 'hg help -v helpext' to show built-in aliases and global options)
 
 
-test deprecated and experimental options are hidden in command help
+test advanced, deprecated and experimental options are hidden in command help
+  $ hg help debugoptADV
+  hg debugoptADV
+  
+  (no help text available)
+  
+  options:
+  
+  (some details hidden, use --verbose to show complete help)
   $ hg help debugoptDEP
   hg debugoptDEP
   
@@ -1127,7 +1137,9 b' test deprecated and experimental options'
   
   (some details hidden, use --verbose to show complete help)
 
-test deprecated and experimental options is shown with -v
+test advanced, deprecated and experimental options are shown with -v
+  $ hg help -v debugoptADV | grep aopt
+    --aopt option is (ADVANCED)
   $ hg help -v debugoptDEP | grep dopt
     --dopt option is (DEPRECATED)
   $ hg help -v debugoptEXP | grep eopt