[PATCH v1 2/3] blame: add --hint option

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

When printing aggregate information about revisions, this option
allows to add the 1-line summary of the revision to provide the
reader with some additional context about the revision itself.

Signed-off-by: Edmundo Carmona Antoranz <eantoranz@gmail.com>
---
 Documentation/blame-options.txt |  4 ++++
 Documentation/git-blame.txt     |  2 +-
 builtin/blame.c                 | 13 +++++++++++--
 3 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/Documentation/blame-options.txt b/Documentation/blame-options.txt
index be2a327ff..64858a631 100644
--- a/Documentation/blame-options.txt
+++ b/Documentation/blame-options.txt
@@ -53,6 +53,10 @@ include::line-range-format.txt[]
 	Aggregate information about revisions. This option makes no
 	difference on incremental or porcelain format.
 
+--hint::
+	Show revision hints on aggregated information about the revision.
+	Implies --aggregate.
+
 --encoding=<encoding>::
 	Specifies the encoding used to output author names
 	and commit summaries. Setting it to `none` makes blame
diff --git a/Documentation/git-blame.txt b/Documentation/git-blame.txt
index 385eaf7be..ed8b119fa 100644
--- a/Documentation/git-blame.txt
+++ b/Documentation/git-blame.txt
@@ -10,7 +10,7 @@ SYNOPSIS
 [verse]
 'git blame' [-c] [-b] [-l] [--root] [-t] [-f] [-n] [-s] [-e] [-p] [-w] [--incremental]
 	    [-L <range>] [-S <revs-file>] [-M] [-C] [-C] [-C] [--since=<date>]
-	    [--progress] [--abbrev=<n>] [--aggregate] 
+	    [--progress] [--abbrev=<n>] [--aggregate] [--hint]
 	    [<rev> | --contents <file> | --reverse <rev>..<rev>] [--] <file>
 
 DESCRIPTION
diff --git a/builtin/blame.c b/builtin/blame.c
index 09b3b0c8a..7473b50e9 100644
--- a/builtin/blame.c
+++ b/builtin/blame.c
@@ -1885,6 +1885,7 @@ static const char *format_time(unsigned long time, const char *tz_str,
 #define OUTPUT_SHOW_EMAIL	0400
 #define OUTPUT_LINE_PORCELAIN 01000
 #define OUTPUT_AGGREGATE      02000
+#define OUTPUT_HINT           04000
 
 static void emit_porcelain_details(struct origin *suspect, int repeat)
 {
@@ -2001,8 +2002,12 @@ static void print_revision_info(char* revision_hex, int revision_length, struct
 	if (line_number && (opt & OUTPUT_AGGREGATE))
 		printf(opt & OUTPUT_ANNOTATE_COMPAT ? "%*d)" : " %*d) ",
 			   max_digits, line_number);
-	if (!line_number)
-		printf(")\n");
+	if (!line_number) {
+		printf(")");
+		if (opt & OUTPUT_HINT)
+			printf(" %s", ci.summary.buf);
+		printf("\n");
+	}
 }
 
 static void emit_other(struct scoreboard *sb, struct blame_entry *ent, int opt)
@@ -2018,6 +2023,9 @@ static void emit_other(struct scoreboard *sb, struct blame_entry *ent, int opt)
 	get_commit_info(suspect->commit, &ci, 1);
 	sha1_to_hex_r(hex, suspect->commit->object.oid.hash);
 
+	if (~(opt & OUTPUT_AGGREGATE) & (opt & OUTPUT_HINT))
+		opt=opt|OUTPUT_AGGREGATE;
+
 	if (opt & OUTPUT_AGGREGATE)
 		print_revision_info(hex, revision_length, ent, ci, opt, show_raw_time, 0);
 
@@ -2638,6 +2646,7 @@ int cmd_blame(int argc, const char **argv, const char *prefix)
 		{ OPTION_CALLBACK, 'M', NULL, &opt, N_("score"), N_("Find line movements within and across files"), PARSE_OPT_OPTARG, blame_move_callback },
 		OPT_STRING_LIST('L', NULL, &range_list, N_("n,m"), N_("Process only line range n,m, counting from 1")),
 		OPT_BIT(0, "aggregate", &output_option, N_("Aggregate output"), OUTPUT_AGGREGATE),
+		OPT_BIT(0, "hint", &output_option, N_("Show revision hints"), OUTPUT_HINT),
 		OPT__ABBREV(&abbrev),
 		OPT_END()
 	};
-- 
2.11.0.rc1