Re: [PATCH] grep: don't support "grep.color"-like config options

[Junio C Hamano <gitster@pobox.com>]

Johannes Schindelin <Johannes.Schindelin@gmx.de> writes:

> On Tue, 21 Apr 2009, Markus Heidelberg wrote:
>
>> color.grep and color.grep.* is the official and documented way to 
>> highlight grep matches. Comparable options like diff.color.* and 
>> status.color.* exist for backward compatibility reasons only and are not 
>> documented any more.
>
> But is it really so bad that we have to possibly break existing setups?
>
> The cost of keeping them is really small IMHO.

While I do not think these lines themselves will cost us a lot of
maintenance effort, people tend to mimick existing code, and these
patterns can proliferate if unchecked, and *that* would add to
maintenance.  As the feature has aleady been in master for 6 weeks or so,
Markus's patch is now-or-never, and I'd rather say we take it before the
1.6.3 final.

An alternative would be to:

 (1) Keep them undocumented;

 (2) add code comments about their deprecated status to discourage people
     from copying the style; and

 (3) possibly deprecate it in some future.

but I do not know if the last step is worth it.

In any case, I think perhaps we should squash this in.

 diff.c      |    5 +++++
 wt-status.c |    5 +++++
 2 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/diff.c b/diff.c
index 3ac7168..f2432de 100644
--- a/diff.c
+++ b/diff.c
@@ -79,6 +79,11 @@ static int git_config_rename(const char *var, const char *value)
  */
 int git_diff_ui_config(const char *var, const char *value, void *cb)
 {
+	/*
+	 * Note: cmdname.color style of configuration variables are
+	 * deprecated; do not copy this pattern but accept only
+	 * color.cmdname in new code.
+	 */
 	if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
 		diff_use_color_default = git_config_colorbool(var, value, -1);
 		return 0;
diff --git a/wt-status.c b/wt-status.c
index 929b00f..9726e0b 100644
--- a/wt-status.c
+++ b/wt-status.c
@@ -381,6 +381,11 @@ int git_status_config(const char *k, const char *v, void *cb)
 			wt_status_submodule_summary = -1;
 		return 0;
 	}
+	/*
+	 * Note: cmdname.color style of configuration variables are
+	 * deprecated; do not copy this pattern but accept only
+	 * color.cmdname in new code.
+	 */
 	if (!strcmp(k, "status.color") || !strcmp(k, "color.status")) {
 		wt_status_use_color = git_config_colorbool(k, v, -1);
 		return 0;