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From: "pedro at palves dot net" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug gdb/30104] New: Add "help variable", like "help function" but
 for convenience variables instead of functions
Date: Thu, 09 Feb 2023 20:19:26 +0000
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X-Bugzilla-Product: gdb
X-Bugzilla-Component: gdb
X-Bugzilla-Version: HEAD
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X-Bugzilla-Who: pedro at palves dot net
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D30104

            Bug ID: 30104
           Summary: Add "help variable", like "help function" but for
                    convenience variables instead of functions
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: pedro at palves dot net
  Target Milestone: ---

We have:

 (gdb) help function=20
 Placeholder command for showing help on convenience functions.

 List of function subcommands:

 function _any_caller_is -- Check all calling function's names.
 function _any_caller_matches -- Compare all calling function's names with =
a=20
 regexp.
 function _as_string -- Return the string representation of a value.
 function _caller_is -- Check the calling function's name.
 function _caller_matches -- Compare the calling function's name with a reg=
exp.
 ...
 Type "help function" followed by function subcommand name for full=20
 documentation.
 ...
 (gdb)

But, we don't have any way to get help about internal convenience variables=
.=20
There's "show convenience", but that's about seeing the variable's values.

IWBN if we added a "help variable" placeholder command, that would work just
like "help function", but it would list variables.  Here's a mockup:

 (gdb) help variable
 Placeholder command for showing help on convenience variables.

 List of variable subcommands:

 variable _gdb_minor -- blah blah
 variable _gdb_major -- blah blah
 $_inferior -- blah blah
 ...
 Type "help variable" followed by variable subcommand name for full=20
 documentation.
 ...
 (gdb)

--=20
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