[PATCH v2] blame: report correct number of lines in progress when using ranges

[Edmundo Carmona Antoranz <eantoranz@gmail.com>]

When using ranges, use their sizes as the limit for progress
instead of the size of the full file.

Before:
$ git blame --progress builtin/blame.c > /dev/null
Blaming lines: 100% (1210/1210), done.
$ git blame --progress -L 100,120 -L 200,300 builtin/blame.c > /dev/null
Blaming lines:  10% (122/1210), done.
$

After:
$ ./git blame --progress builtin/blame.c > /dev/null
Blaming lines: 100% (1210/1210), done.
$ ./git blame --progress -L 100,120 -L 200,300 builtin/blame.c > /dev/null
Blaming lines: 100% (122/122), done.
$

Signed-off-by: Edmundo Carmona Antoranz <eantoranz@gmail.com>
---
 builtin/blame.c  |  6 +++++-
 t/t8002-blame.sh | 28 ++++++++++++++++++++++++++++
 2 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/builtin/blame.c b/builtin/blame.c
index 8d15b68afc..e33372c56b 100644
--- a/builtin/blame.c
+++ b/builtin/blame.c
@@ -898,6 +898,7 @@ int cmd_blame(int argc, const char **argv, const char *prefix)
 	unsigned int range_i;
 	long anchor;
 	const int hexsz = the_hash_algo->hexsz;
+	long num_lines = 0;
 
 	setup_default_color_by_age();
 	git_config(git_blame_config, &output_option);
@@ -1129,7 +1130,10 @@ int cmd_blame(int argc, const char **argv, const char *prefix)
 	for (range_i = ranges.nr; range_i > 0; --range_i) {
 		const struct range *r = &ranges.ranges[range_i - 1];
 		ent = blame_entry_prepend(ent, r->start, r->end, o);
+		num_lines += (r->end - r->start);
 	}
+	if (!num_lines)
+		num_lines = sb.num_lines;
 
 	o->suspects = ent;
 	prio_queue_put(&sb.commits, o->commit);
@@ -1158,7 +1162,7 @@ int cmd_blame(int argc, const char **argv, const char *prefix)
 	sb.found_guilty_entry = &found_guilty_entry;
 	sb.found_guilty_entry_data = &pi;
 	if (show_progress)
-		pi.progress = start_delayed_progress(_("Blaming lines"), sb.num_lines);
+		pi.progress = start_delayed_progress(_("Blaming lines"), num_lines);
 
 	assign_blame(&sb, opt);
 
diff --git a/t/t8002-blame.sh b/t/t8002-blame.sh
index ee4fdd8f18..151a6fddfd 100755
--- a/t/t8002-blame.sh
+++ b/t/t8002-blame.sh
@@ -129,6 +129,34 @@ test_expect_success '--exclude-promisor-objects does not BUG-crash' '
 	test_must_fail git blame --exclude-promisor-objects one
 '
 
+test_expect_success 'blame progress on a full file' '
+	cat >progress.txt <<-\EOF &&
+	a simple test file
+
+	no relevant content is expected here
+
+	If the file is too short, we cannot test ranges
+
+	EOF
+	git add progress.txt &&
+	git commit -m "add a file for testing progress" &&
+	GIT_PROGRESS_DELAY=0 \
+	git blame --progress progress.txt > /dev/null 2> full_progress.txt &&
+	grep "Blaming lines: 100% (6/6), done." full_progress.txt
+'
+
+test_expect_success 'blame progress on a single range' '
+	GIT_PROGRESS_DELAY=0 \
+	git blame --progress -L 2,5 progress.txt > /dev/null 2> range_progress.txt &&
+	grep "Blaming lines: 100% (4/4), done." range_progress.txt
+'
+
+test_expect_success 'blame progress on multiple ranges' '
+	GIT_PROGRESS_DELAY=0 \
+	git blame --progress -L 1,2 -L 4,6 progress.txt > /dev/null 2> range_progress.txt &&
+	grep "Blaming lines: 100% (5/5), done." range_progress.txt
+'
+
 test_expect_success 'blame with uncommitted edits in partial clone does not crash' '
 	git init server &&
 	echo foo >server/file.txt &&
-- 
2.35.1