grep: add color.grep.matchcontext and color.grep.matchselected

The config option color.grep.match can be used to specify the highlighting
color for matching strings.  Add the options matchContext and matchSelected
to allow different colors to be specified for matching strings in the
context vs. in selected lines.  This is similar to the ms and mc specifiers
in GNU grep's environment variable GREP_COLORS.

Tests are from Zoltan Klinger's earlier attempt to solve the same
issue in a different way.

Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 22 insertions, 7 deletions

diff --git a/grep.c b/grep.c
index c668034739..f950651ae6 100644
--- a/grep.c
+++ b/grep.c
@@ -35,7 +35,8 @@ void init_grep_defaults(void)
 	strcpy(opt->color_filename, "");
 	strcpy(opt->color_function, "");
 	strcpy(opt->color_lineno, "");
-	strcpy(opt->color_match, GIT_COLOR_BOLD_RED);
+	strcpy(opt->color_match_context, GIT_COLOR_BOLD_RED);
+	strcpy(opt->color_match_selected, GIT_COLOR_BOLD_RED);
 	strcpy(opt->color_selected, "");
 	strcpy(opt->color_sep, GIT_COLOR_CYAN);
 	opt->color = -1;
@@ -96,12 +97,22 @@ int grep_config(const char *var, const char *value, void *cb)
 		color = opt->color_function;
 	else if (!strcmp(var, "color.grep.linenumber"))
 		color = opt->color_lineno;
-	else if (!strcmp(var, "color.grep.match"))
-		color = opt->color_match;
+	else if (!strcmp(var, "color.grep.matchcontext"))
+		color = opt->color_match_context;
+	else if (!strcmp(var, "color.grep.matchselected"))
+		color = opt->color_match_selected;
 	else if (!strcmp(var, "color.grep.selected"))
 		color = opt->color_selected;
 	else if (!strcmp(var, "color.grep.separator"))
 		color = opt->color_sep;
+	else if (!strcmp(var, "color.grep.match")) {
+		int rc = 0;
+		if (!value)
+			return config_error_nonbool(var);
+		color_parse(value, var, opt->color_match_context);
+		color_parse(value, var, opt->color_match_selected);
+		return rc;
+	}
 
 	if (color) {
 		if (!value)
@@ -139,7 +150,8 @@ void grep_init(struct grep_opt *opt, const char *prefix)
 	strcpy(opt->color_filename, def->color_filename);
 	strcpy(opt->color_function, def->color_function);
 	strcpy(opt->color_lineno, def->color_lineno);
-	strcpy(opt->color_match, def->color_match);
+	strcpy(opt->color_match_context, def->color_match_context);
+	strcpy(opt->color_match_selected, def->color_match_selected);
 	strcpy(opt->color_selected, def->color_selected);
 	strcpy(opt->color_sep, def->color_sep);
 }
@@ -1079,7 +1091,7 @@ static void show_line(struct grep_opt *opt, char *bol, char *eol,
 		      const char *name, unsigned lno, char sign)
 {
 	int rest = eol - bol;
-	char *line_color = NULL;
+	const char *match_color, *line_color = NULL;
 
 	if (opt->file_break && opt->last_shown == 0) {
 		if (opt->show_hunk_mark)
@@ -1118,6 +1130,10 @@ static void show_line(struct grep_opt *opt, char *bol, char *eol,
 		int eflags = 0;
 
 		if (sign == ':')
+			match_color = opt->color_match_selected;
+		else
+			match_color = opt->color_match_context;
+		if (sign == ':')
 			line_color = opt->color_selected;
 		else if (sign == '-')
 			line_color = opt->color_context;
@@ -1130,8 +1146,7 @@ static void show_line(struct grep_opt *opt, char *bol, char *eol,
 
 			output_color(opt, bol, match.rm_so, line_color);
 			output_color(opt, bol + match.rm_so,
-				     match.rm_eo - match.rm_so,
-				     opt->color_match);
+				     match.rm_eo - match.rm_so, match_color);
 			bol += match.rm_eo;
 			rest -= match.rm_eo;
 			eflags = REG_NOTBOL;