interpret-trailers: add an option to show only existing trailers

diff --git a/builtin/rev-parse.c b/builtin/rev-parse.c
index 1e5bdea0d5ba598b4191238fee761295bd8523ab..051333091062ef8e2e717ec4aef8a9bdf3b4450f 100644 (file)
--- a/builtin/rev-parse.c
+++ b/builtin/rev-parse.c
@@ -205,21 +205,22 @@ static int anti_reference(const char *refname, const struct object_id *oid, int
        return 0;
 }
 
-static int show_abbrev(const unsigned char *sha1, void *cb_data)
+static int show_abbrev(const struct object_id *oid, void *cb_data)
 {
-       show_rev(NORMAL, sha1, NULL);
+       show_rev(NORMAL, oid->hash, NULL);
        return 0;
 }
 
 static void show_datestring(const char *flag, const char *datestr)
 {
-       static char buffer[100];
+       char *buffer;
 
        /* date handling requires both flags and revs */
        if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
                return;
-       snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
+       buffer = xstrfmt("%s%lu", flag, approxidate(datestr));
        show(buffer);
+       free(buffer);
 }
 
 static int show_file(const char *arg, int output_prefix)
@@ -228,9 +229,9 @@ static int show_file(const char *arg, int output_prefix)
        if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
                if (output_prefix) {
                        const char *prefix = startup_info->prefix;
-                       show(prefix_filename(prefix,
-                                            prefix ? strlen(prefix) : 0,
-                                            arg));
+                       char *fname = prefix_filename(prefix, arg);
+                       show(fname);
+                       free(fname);
                } else
                        show(arg);
                return 1;