notes remove: --stdin reads from the standard input

Teach the command to read object names to remove from the standard
input, in addition to the object names given from the command line.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 15 insertions, 4 deletions

diff --git a/builtin/notes.c b/builtin/notes.c
index 541f776..f8e437d 100644
--- a/builtin/notes.c
+++ b/builtin/notes.c
@@ -953,7 +953,7 @@ static int merge(int argc, const char **argv, const char *prefix)
 	return result < 0; /* return non-zero on conflicts */
 }
 
-#define MISSING_OK 1
+#define IGNORE_MISSING 1
 
 static int remove_one_note(struct notes_tree *t, const char *name, unsigned flag)
 {
@@ -966,16 +966,19 @@ static int remove_one_note(struct notes_tree *t, const char *name, unsigned flag
 		fprintf(stderr, _("Object %s has no note\n"), name);
 	else
 		fprintf(stderr, _("Removing note for object %s\n"), name);
-	return (flag & MISSING_OK) ? 0 : status;
+	return (flag & IGNORE_MISSING) ? 0 : status;
 }
 
 static int remove_cmd(int argc, const char **argv, const char *prefix)
 {
 	unsigned flag = 0;
+	int from_stdin = 0;
 	struct option options[] = {
 		OPT_BIT(0, "ignore-missing", &flag,
 			"attempt to remove non-existent note is not an error",
-			MISSING_OK),
+			IGNORE_MISSING),
+		OPT_BOOLEAN(0, "stdin", &from_stdin,
+			    "read object names from the standard input"),
 		OPT_END()
 	};
 	struct notes_tree *t;
@@ -986,7 +989,7 @@ static int remove_cmd(int argc, const char **argv, const char *prefix)
 
 	t = init_notes_check("remove");
 
-	if (!argc) {
+	if (!argc && !from_stdin) {
 		retval = remove_one_note(t, "HEAD", flag);
 	} else {
 		while (*argv) {
@@ -994,6 +997,14 @@ static int remove_cmd(int argc, const char **argv, const char *prefix)
 			argv++;
 		}
 	}
+	if (from_stdin) {
+		struct strbuf sb = STRBUF_INIT;
+		while (strbuf_getwholeline(&sb, stdin, '\n') != EOF) {
+			strbuf_rtrim(&sb);
+			retval |= remove_one_note(t, sb.buf, flag);
+		}
+		strbuf_release(&sb);
+	}
 	if (!retval)
 		commit_notes(t, "Notes removed by 'git notes remove'");
 	free_notes(t);