Re: [PATCH 5/7] help: error if [-a|-g|-c] and [-i|-m|-w] are combined

Add more sanity checking to "git help" usage by erroring out if these
man viewer options are combined with incompatible command-modes that
will never use these documentation viewers.

This continues the work started in d35d03cf93e (help: simplify by
moving to OPT_CMDMODE(), 2021-09-22) of adding more sanity checking to
"git help". Doing this allows us to clarify the "SYNOPSIS" in the
documentation, and the "git help -h" output.

Signed-off-by: Ævar Arnfjörð Bjarmason <redacted>
---

diff --git a/builtin/help.c b/builtin/help.c

@@ -581,6 +581,13 @@ static void no_extra_argc(int argc)
+static void no_format(void)
+{
+       if (help_format != HELP_FORMAT_NONE)
+               usage_msg_opt(_("[-a|--all] cannot be combined with [[-i|--info] [-m|--man] [-w|--web]]"),
+                             builtin_help_usage, builtin_help_options);
+}