blame: -b (blame.blankboundary) and --root (blame.showroot)

When blame.blankboundary is set (or -b option is given), commit
object names are blanked out in the "human readable" output
format for boundary commits.

When blame.showroot is not set (or --root is not given), the
root commits are treated as boundary commits.  The code still
attributes the lines to them, but with -b their object names are
not shown.

Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/builtin-blame.c b/builtin-blame.c
index a250724463fff1990c4f513cfa8468e36acc8c41..211bdb3a758eaf813f54b1895ff2e971d170500a 100644 (file)
--- a/builtin-blame.c
+++ b/builtin-blame.c
@@ -22,7 +22,9 @@
 static char blame_usage[] =
 "git-blame [-c] [-l] [-t] [-f] [-n] [-p] [-L n,m] [-S <revs-file>] [-M] [-C] [-C] [commit] [--] file\n"
 "  -c, --compatibility Use the same output mode as git-annotate (Default: off)\n"
+"  -b                  Show blank SHA-1 for boundary commits (Default: off)\n"
 "  -l, --long          Show long commit SHA1 (Default: off)\n"
+"  --root              Do not treat root commits as boundaries (Default: off)\n"
 "  -t, --time          Show raw timestamp (Default: off)\n"
 "  -f, --show-name     Show original filename (Default: auto)\n"
 "  -n, --show-number   Show original linenumber (Default: off)\n"
@@ -36,6 +38,8 @@ static int longest_author;
 static int max_orig_digits;
 static int max_digits;
 static int max_score_digits;
+static int show_root;
+static int blank_boundary;
 
 #ifndef DEBUG
 #define DEBUG 0
@@ -1095,6 +1099,9 @@ static void assign_blame(struct scoreboard *sb, struct rev_info *revs, int opt)
                        if (commit->object.parsed)
                                mark_parents_uninteresting(commit);
                }
+               /* treat root commit as boundary */
+               if (!commit->parents && !show_root)
+                       commit->object.flags |= UNINTERESTING;
 
                /* Take responsibility for the remaining entries */
                for (ent = sb->ent; ent; ent = ent->next)
@@ -1318,8 +1325,12 @@ static void emit_other(struct scoreboard *sb, struct blame_entry *ent, int opt)
                int length = (opt & OUTPUT_LONG_OBJECT_NAME) ? 40 : 8;
 
                if (suspect->commit->object.flags & UNINTERESTING) {
-                       length--;
-                       putchar('^');
+                       if (!blank_boundary) {
+                               length--;
+                               putchar('^');
+                       }
+                       else
+                               memset(hex, ' ', length);
                }
 
                printf("%.*s", length, hex);
@@ -1639,6 +1650,19 @@ static void prepare_blame_range(struct scoreboard *sb,
                usage(blame_usage);
 }
 
+static int git_blame_config(const char *var, const char *value)
+{
+       if (!strcmp(var, "blame.showroot")) {
+               show_root = git_config_bool(var, value);
+               return 0;
+       }
+       if (!strcmp(var, "blame.blankboundary")) {
+               blank_boundary = git_config_bool(var, value);
+               return 0;
+       }
+       return git_default_config(var, value);
+}
+
 int cmd_blame(int argc, const char **argv, const char *prefix)
 {
        struct rev_info revs;
@@ -1654,6 +1678,7 @@ int cmd_blame(int argc, const char **argv, const char *prefix)
        char type[10];
        const char *bottomtop = NULL;
 
+       git_config(git_blame_config);
        save_commit_buffer = 0;
 
        opt = 0;
@@ -1662,6 +1687,10 @@ int cmd_blame(int argc, const char **argv, const char *prefix)
                const char *arg = argv[i];
                if (*arg != '-')
                        break;
+               else if (!strcmp("-b", arg))
+                       blank_boundary = 1;
+               else if (!strcmp("--root", arg))
+                       show_root = 1;
                else if (!strcmp("-c", arg))
                        output_option |= OUTPUT_ANNOTATE_COMPAT;
                else if (!strcmp("-t", arg))