Merge branch 'jk/blame-fixes' into maint

"git blame --porcelain" misidentified the "previous" <commit, path>
pair (aka "source") when contents came from two or more files.

* jk/blame-fixes:
  blame: output porcelain "previous" header for each file
  blame: handle --no-abbrev
  blame: fix alignment with --abbrev=40

1 files changed, 17 insertions, 10 deletions

diff --git a/builtin/blame.c b/builtin/blame.c
index 4ddfadb..3aae19a 100644
--- a/builtin/blame.c
+++ b/builtin/blame.c
@@ -1700,13 +1700,23 @@ static void get_commit_info(struct commit *commit,
 }
 
 /*
+ * Write out any suspect information which depends on the path. This must be
+ * handled separately from emit_one_suspect_detail(), because a given commit
+ * may have changes in multiple paths. So this needs to appear each time
+ * we mention a new group.
+ *
  * To allow LF and other nonportable characters in pathnames,
  * they are c-style quoted as needed.
  */
-static void write_filename_info(const char *path)
+static void write_filename_info(struct origin *suspect)
 {
+	if (suspect->previous) {
+		struct origin *prev = suspect->previous;
+		printf("previous %s ", oid_to_hex(&prev->commit->object.oid));
+		write_name_quoted(prev->path, stdout, '\n');
+	}
 	printf("filename ");
-	write_name_quoted(path, stdout, '\n');
+	write_name_quoted(suspect->path, stdout, '\n');
 }
 
 /*
@@ -1735,11 +1745,6 @@ static int emit_one_suspect_detail(struct origin *suspect, int repeat)
 	printf("summary %s\n", ci.summary.buf);
 	if (suspect->commit->object.flags & UNINTERESTING)
 		printf("boundary\n");
-	if (suspect->previous) {
-		struct origin *prev = suspect->previous;
-		printf("previous %s ", oid_to_hex(&prev->commit->object.oid));
-		write_name_quoted(prev->path, stdout, '\n');
-	}
 
 	commit_info_destroy(&ci);
 
@@ -1760,7 +1765,7 @@ static void found_guilty_entry(struct blame_entry *ent,
 		       oid_to_hex(&suspect->commit->object.oid),
 		       ent->s_lno + 1, ent->lno + 1, ent->num_lines);
 		emit_one_suspect_detail(suspect, 0);
-		write_filename_info(suspect->path);
+		write_filename_info(suspect);
 		maybe_flush_or_die(stdout, "stdout");
 	}
 	pi->blamed_lines += ent->num_lines;
@@ -1884,7 +1889,7 @@ static void emit_porcelain_details(struct origin *suspect, int repeat)
 {
 	if (emit_one_suspect_detail(suspect, repeat) ||
 	    (suspect->commit->object.flags & MORE_THAN_ONE_PATH))
-		write_filename_info(suspect->path);
+		write_filename_info(suspect);
 }
 
 static void emit_porcelain(struct scoreboard *sb, struct blame_entry *ent,
@@ -2656,9 +2661,11 @@ parse_done:
 	} else if (show_progress < 0)
 		show_progress = isatty(2);
 
-	if (0 < abbrev)
+	if (0 < abbrev && abbrev < GIT_SHA1_HEXSZ)
 		/* one more abbrev length is needed for the boundary commit */
 		abbrev++;
+	else if (!abbrev)
+		abbrev = GIT_SHA1_HEXSZ;
 
 	if (revs_file && read_ancestry(revs_file))
 		die_errno("reading graft file '%s' failed", revs_file);