expose a helper function peel_to_type().

diff --git a/builtin-name-rev.c b/builtin-name-rev.c
index a0c89a827b666d8e01ba64597b732205ce1a643e..f22c8b5f5da0031657f10ddb827d33a07056e3a5 100644 (file)
--- a/builtin-name-rev.c
+++ b/builtin-name-rev.c
@@ -125,18 +125,18 @@ static int name_ref(const char *path, const unsigned char *sha1, int flags, void
 }
 
 /* returns a static buffer */
-static const char* get_rev_name(struct object *o)
+static const char *get_rev_name(struct object *o)
 {
        static char buffer[1024];
        struct rev_name *n;
        struct commit *c;
 
        if (o->type != OBJ_COMMIT)
-               return "undefined";
+               return NULL;
        c = (struct commit *) o;
        n = c->util;
        if (!n)
-               return "undefined";
+               return NULL;
 
        if (!n->generation)
                return n->tip_name;
@@ -159,7 +159,7 @@ static char const * const name_rev_usage[] = {
 int cmd_name_rev(int argc, const char **argv, const char *prefix)
 {
        struct object_array revs = { 0, 0, NULL };
-       int all = 0, transform_stdin = 0;
+       int all = 0, transform_stdin = 0, allow_undefined = 1;
        struct name_ref_data data = { 0, 0, NULL };
        struct option opts[] = {
                OPT_BOOLEAN(0, "name-only", &data.name_only, "print only names (no SHA-1)"),
@@ -169,6 +169,7 @@ int cmd_name_rev(int argc, const char **argv, const char *prefix)
                OPT_GROUP(""),
                OPT_BOOLEAN(0, "all", &all, "list all commits reachable from all refs"),
                OPT_BOOLEAN(0, "stdin", &transform_stdin, "read from stdin"),
+               OPT_BOOLEAN(0, "undefined", &allow_undefined, "allow to print `undefined` names"),
                OPT_END(),
        };
 
@@ -226,7 +227,7 @@ int cmd_name_rev(int argc, const char **argv, const char *prefix)
                                else if (++forty == 40 &&
                                                !ishex(*(p+1))) {
                                        unsigned char sha1[40];
-                                       const char *name = "undefined";
+                                       const char *name = NULL;
                                        char c = *(p+1);
 
                                        forty = 0;
@@ -240,11 +241,10 @@ int cmd_name_rev(int argc, const char **argv, const char *prefix)
                                        }
                                        *(p+1) = c;
 
-                                       if (!strcmp(name, "undefined"))
+                                       if (!name)
                                                continue;
 
-                                       fwrite(p_start, p - p_start + 1, 1,
-                                              stdout);
+                                       fwrite(p_start, p - p_start + 1, 1, stdout);
                                        printf(" (%s)", name);
                                        p_start = p + 1;
                                }
@@ -260,18 +260,32 @@ int cmd_name_rev(int argc, const char **argv, const char *prefix)
                max = get_max_object_index();
                for (i = 0; i < max; i++) {
                        struct object * obj = get_indexed_object(i);
+                       const char *name;
                        if (!obj)
                                continue;
                        if (!data.name_only)
                                printf("%s ", sha1_to_hex(obj->sha1));
-                       printf("%s\n", get_rev_name(obj));
+                       name = get_rev_name(obj);
+                       if (name)
+                               printf("%s\n", name);
+                       else if (allow_undefined)
+                               printf("undefined\n");
+                       else
+                               die("cannot describe '%s'", sha1_to_hex(obj->sha1));
                }
        } else {
                int i;
                for (i = 0; i < revs.nr; i++) {
+                       const char *name;
                        if (!data.name_only)
                                printf("%s ", revs.objects[i].name);
-                       printf("%s\n", get_rev_name(revs.objects[i].item));
+                       name = get_rev_name(revs.objects[i].item);
+                       if (name)
+                               printf("%s\n", name);
+                       else if (allow_undefined)
+                               printf("undefined\n");
+                       else
+                               die("cannot describe '%s'", sha1_to_hex(revs.objects[i].item->sha1));
                }
        }