rev-parse: --abbrev-ref option to shorten ref name

This applies the shorten_unambiguous_ref function to the object name.
Default mode is controlled by core.warnAmbiguousRefs. Else it is given as
optional argument to --abbrev-ref={strict|loose}.

This should be faster than 'git for-each-ref --format="%(refname:short)" <ref>'
for single refs.

Signed-off-by: Bert Wesarg <bert.wesarg@googlemail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/git-rev-parse.txt b/Documentation/git-rev-parse.txt
index 5ed2bc840f962cfe3af6bf4540edf46f47b9e148..fba30b12eddb453e37a548d4c66de2096cd6a361 100644 (file)
--- a/Documentation/git-rev-parse.txt
+++ b/Documentation/git-rev-parse.txt
@@ -84,6 +84,11 @@ OPTIONS
        unfortunately named tag "master"), and show them as full
        refnames (e.g. "refs/heads/master").
 
+--abbrev-ref[={strict|loose}]::
+       A non-ambiguous short name of the objects name.
+       The option core.warnAmbiguousRefs is used to select the strict
+       abbreviation mode.
+
 --all::
        Show all refs found in `$GIT_DIR/refs`.
 

diff --git a/builtin-rev-parse.c b/builtin-rev-parse.c
index 81d5a6ffc9ff1c149bfb68f976a9e66c307cae1d..22c6d6ad161f0de7dee88336a81a8f1f873c0bb0 100644 (file)
--- a/builtin-rev-parse.c
+++ b/builtin-rev-parse.c
@@ -26,6 +26,8 @@ static int show_type = NORMAL;
 #define SHOW_SYMBOLIC_FULL 2
 static int symbolic;
 static int abbrev;
+static int abbrev_ref;
+static int abbrev_ref_strict;
 static int output_sq;
 
 /*
@@ -109,8 +111,8 @@ static void show_rev(int type, const unsigned char *sha1, const char *name)
                return;
        def = NULL;
 
-       if (symbolic && name) {
-               if (symbolic == SHOW_SYMBOLIC_FULL) {
+       if ((symbolic || abbrev_ref) && name) {
+               if (symbolic == SHOW_SYMBOLIC_FULL || abbrev_ref) {
                        unsigned char discard[20];
                        char *full;
 
@@ -125,6 +127,9 @@ static void show_rev(int type, const unsigned char *sha1, const char *name)
                                 */
                                break;
                        case 1: /* happy */
+                               if (abbrev_ref)
+                                       full = shorten_unambiguous_ref(full,
+                                               abbrev_ref_strict);
                                show_with_type(type, full);
                                break;
                        default: /* ambiguous */
@@ -506,6 +511,20 @@ int cmd_rev_parse(int argc, const char **argv, const char *prefix)
                                symbolic = SHOW_SYMBOLIC_FULL;
                                continue;
                        }
+                       if (!prefixcmp(arg, "--abbrev-ref") &&
+                           (!arg[12] || arg[12] == '=')) {
+                               abbrev_ref = 1;
+                               abbrev_ref_strict = warn_ambiguous_refs;
+                               if (arg[12] == '=') {
+                                       if (!strcmp(arg + 13, "strict"))
+                                               abbrev_ref_strict = 1;
+                                       else if (!strcmp(arg + 13, "loose"))
+                                               abbrev_ref_strict = 0;
+                                       else
+                                               die("unknown mode for %s", arg);
+                               }
+                               continue;
+                       }
                        if (!strcmp(arg, "--all")) {
                                for_each_ref(show_reference, NULL);
                                continue;