[PATCH v2 1/2] grep.c: extract show_line_header()

[Taylor Blau <me@xxxxxxxxxxxx>]

Teach 'git-grep(1)' how to print a line header multiple times from
show_line() in preparation for it learning '--only-matching'.

show_line_header() comprises the code in show_line() executed in order
to produce a line header. It is a one-for-one extraction of the existing
implementation.

For now, show_line_header() provides no benefit over the change before
this patch. The following patch will conditionally call
show_line_header() multiple times per invocation to show_line(), which
is the desired benefit of this change.

Signed-off-by: Taylor Blau <me@xxxxxxxxxxxx>
---
 grep.c | 44 +++++++++++++++++++++++++-------------------
 1 file changed, 25 insertions(+), 19 deletions(-)

diff --git a/grep.c b/grep.c
index 5ba1b05526..36bf7cf08d 100644
--- a/grep.c
+++ b/grep.c
@@ -1369,26 +1369,9 @@ static int next_match(struct grep_opt *opt, char *bol, char *eol,
 	return hit;
 }
 
-static void show_line(struct grep_opt *opt, char *bol, char *eol,
-		      const char *name, unsigned lno, unsigned cno, char sign)
+static void show_line_header(struct grep_opt *opt, const char *name,
+                             unsigned lno, unsigned cno, char sign)
 {
-	int rest = eol - bol;
-	const char *match_color, *line_color = NULL;
-
-	if (opt->file_break && opt->last_shown == 0) {
-		if (opt->show_hunk_mark)
-			opt->output(opt, "\n", 1);
-	} else if (opt->pre_context || opt->post_context || opt->funcbody) {
-		if (opt->last_shown == 0) {
-			if (opt->show_hunk_mark) {
-				output_color(opt, "--", 2, opt->color_sep);
-				opt->output(opt, "\n", 1);
-			}
-		} else if (lno > opt->last_shown + 1) {
-			output_color(opt, "--", 2, opt->color_sep);
-			opt->output(opt, "\n", 1);
-		}
-	}
 	if (opt->heading && opt->last_shown == 0) {
 		output_color(opt, name, strlen(name), opt->color_filename);
 		opt->output(opt, "\n", 1);
@@ -1417,6 +1400,29 @@ static void show_line(struct grep_opt *opt, char *bol, char *eol,
 		output_color(opt, buf, strlen(buf), opt->color_columnno);
 		output_sep(opt, sign);
 	}
+}
+
+static void show_line(struct grep_opt *opt, char *bol, char *eol,
+		      const char *name, unsigned lno, unsigned cno, char sign)
+{
+	int rest = eol - bol;
+	const char *match_color, *line_color = NULL;
+
+	if (opt->file_break && opt->last_shown == 0) {
+		if (opt->show_hunk_mark)
+			opt->output(opt, "\n", 1);
+	} else if (opt->pre_context || opt->post_context || opt->funcbody) {
+		if (opt->last_shown == 0) {
+			if (opt->show_hunk_mark) {
+				output_color(opt, "--", 2, opt->color_sep);
+				opt->output(opt, "\n", 1);
+			}
+		} else if (lno > opt->last_shown + 1) {
+			output_color(opt, "--", 2, opt->color_sep);
+			opt->output(opt, "\n", 1);
+		}
+	}
+	show_line_header(opt, name, lno, cno, sign);
 	if (opt->color) {
 		regmatch_t match;
 		enum grep_context ctx = GREP_CONTEXT_BODY;
-- 
2.17.0