status: make "how to stage" messages optional

These messages are nice for new users, but experienced git
users know how to manipulate the index, and these messages
waste a lot of screen real estate.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/config.txt

@@ -122,6 +122,10 @@ advice.*::
 	pushNonFastForward::
 		Advice shown when linkgit:git-push[1] refuses
 		non-fast-forward refs. Default: true.
+	statusHints::
+		Directions on how to stage/unstage/add shown in the
+		output of linkgit:git-status[1] and the template shown
+		when writing commit messages. Default: true.
 --
 
 core.fileMode::

advice.c

@@ -1,12 +1,14 @@
 #include "cache.h"
 
 int advice_push_nonfastforward = 1;
+int advice_status_hints = 1;
 
 static struct {
 	const char *name;
 	int *preference;
 } advice_config[] = {
 	{ "pushnonfastforward", &advice_push_nonfastforward },
+	{ "statushints", &advice_status_hints },
 };
 
 int git_default_advice_config(const char *var, const char *value)

advice.h

@@ -2,6 +2,7 @@
 #define ADVICE_H
 
 extern int advice_push_nonfastforward;
+extern int advice_status_hints;
 
 int git_default_advice_config(const char *var, const char *value);
 

wt-status.c

@@ -48,6 +48,8 @@ static void wt_status_print_unmerged_header(struct wt_status *s)
 {
 	const char *c = color(WT_STATUS_HEADER, s);
 	color_fprintf_ln(s->fp, c, "# Unmerged paths:");
+	if (!advice_status_hints)
+		return;
 	if (!s->is_initial)
 		color_fprintf_ln(s->fp, c, "#   (use \"git reset %s <file>...\" to unstage)", s->reference);
 	else
@@ -60,6 +62,8 @@ static void wt_status_print_cached_header(struct wt_status *s)
 {
 	const char *c = color(WT_STATUS_HEADER, s);
 	color_fprintf_ln(s->fp, c, "# Changes to be committed:");
+	if (!advice_status_hints)
+		return;
 	if (!s->is_initial) {
 		color_fprintf_ln(s->fp, c, "#   (use \"git reset %s <file>...\" to unstage)", s->reference);
 	} else {
@@ -73,6 +77,8 @@ static void wt_status_print_dirty_header(struct wt_status *s,
 {
 	const char *c = color(WT_STATUS_HEADER, s);
 	color_fprintf_ln(s->fp, c, "# Changed but not updated:");
+	if (!advice_status_hints)
+		return;
 	if (!has_deleted)
 		color_fprintf_ln(s->fp, c, "#   (use \"git add <file>...\" to update what will be committed)");
 	else
@@ -85,6 +91,8 @@ static void wt_status_print_untracked_header(struct wt_status *s)
 {
 	const char *c = color(WT_STATUS_HEADER, s);
 	color_fprintf_ln(s->fp, c, "# Untracked files:");
+	if (!advice_status_hints)
+		return;
 	color_fprintf_ln(s->fp, c, "#   (use \"git add <file>...\" to include in what will be committed)");
 	color_fprintf_ln(s->fp, c, "#");
 }