[PATCH 10/12] add --always-print option

[Bo Yang <struggleyb.nku@gmail.com>]

Always print the interesting ranges even if the current
commit does not change any line of it.

Signed-off-by: Bo Yang <struggleyb.nku@gmail.com>
---
 builtin/log.c |    3 +++
 line.c        |   11 +++++++++--
 revision.h    |    3 ++-
 3 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/builtin/log.c b/builtin/log.c
index 87d6b2f..a0918ef 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -85,6 +85,7 @@ static void cmd_log_init(int argc, const char **argv, const char *prefix,
 {
 	int i;
 	int decoration_given = 0;
+	static int always_print = 0;
 	struct userformat_want w;
 	const char *path = NULL, *pathspec = NULL;
 	static struct diff_line_range *range = NULL;
@@ -92,6 +93,7 @@ static void cmd_log_init(int argc, const char **argv, const char *prefix,
 	static struct line_opt_callback_data line_cb = {&range, &ctx, NULL};
 	static const struct option options[] = {
 		OPT_CALLBACK('L', NULL, &line_cb, "n,m", "Process only line range n,m, counting from 1", log_line_range_callback),
+		OPT_BOOLEAN(0, "always-print", &always_print, "Always print the interesting range even if the current commit does not change any line of it"),
 		OPT_END()
 	};
 	static const struct option null_options[] = {
@@ -244,6 +246,7 @@ parse_done2:
 	/* Test whether line level history is asked for */
 	if (range && range->nr > 0) {
 		setup_line(rev, range);
+		rev->always_print = always_print;
 	}
 }
 
diff --git a/line.c b/line.c
index 46d0937..655fa71 100644
--- a/line.c
+++ b/line.c
@@ -1067,6 +1067,13 @@ static void diff_flush_filepair(struct rev_info *rev, struct diff_line_range *ra
 	 * no sensible rang->pair since there is no diff run.
 	 */
 	if (one == NULL) {
+		if (rev->always_print) {
+			chunk.two = two->data;
+			chunk.two_end = two->data + two->size;
+			chunk.ltwo = 1;
+			chunk.range = range;
+			diff_flush_chunks(&rev->diffopt, &chunk);
+		}
 		return;
 	}
 
@@ -1177,7 +1184,7 @@ static void line_log_flush(struct rev_info *rev, struct commit *c)
 		return flush_nontrivial_merge(rev, nontrivial);
 
 	while (range) {
-		if (range->diff)
+		if (range->diff || (range->nr && rev->always_print))
 			diff_flush_filepair(rev, range);
 		range = range->next;
 	}
@@ -1211,7 +1218,7 @@ int cmd_line_log_walk(struct rev_info *rev)
 			assign_parents_range(rev, commit);
 		}
 
-		if (commit->object.flags & NEED_PRINT) {
+		if (commit->object.flags & NEED_PRINT || rev->always_print) {
 			line_log_flush(rev, commit);
 		}
 
diff --git a/revision.h b/revision.h
index 2bc3750..02ab14c 100644
--- a/revision.h
+++ b/revision.h
@@ -71,7 +71,8 @@ struct rev_info {
 			bisect:1,
 			ancestry_path:1,
 			first_parent_only:1,
-			line:1;
+			line:1,
+			always_print:1;
 
 	/* Diff flags */
 	unsigned int	diff:1,
-- 
1.7.1.577.g36cf0.dirty