[PATCH] for-each-ref: refname:short utilize core.warnAmbiguousRefs

[Bert Wesarg <bert.wesarg@googlemail.com>]

core.warnAmbiguousRefs is used to select strict mode for the
abbreviation for the "refname:short" format.

In strict mode, the abbreviated ref will never trigger the
'warn_ambiguous_refs' warning. I.e. for these refs:

  refs/heads/xyzzy
  refs/tags/xyzzy

the abbreviated forms are:

  heads/xyzzy
  tags/xyzzy

Signed-off-by: Bert Wesarg <bert.wesarg@googlemail.com>
---

Cc: "Jeff King" <peff@peff.net>
Cc: git@vger.kernel.org
Cc: szeder@ira.uka.de
Cc: "Shawn O. Pearce" <spearce@spearce.org>

 Documentation/git-for-each-ref.txt |    2 ++
 builtin-for-each-ref.c             |    6 +++++-
 t/t6300-for-each-ref.sh            |   18 +++++++++++++++---
 3 files changed, 22 insertions(+), 4 deletions(-)

diff --git a/Documentation/git-for-each-ref.txt b/Documentation/git-for-each-ref.txt
index 5061d3e..42cfad9 100644
--- a/Documentation/git-for-each-ref.txt
+++ b/Documentation/git-for-each-ref.txt
@@ -75,6 +75,8 @@ For all objects, the following names can be used:
 refname::
 	The name of the ref (the part after $GIT_DIR/).
 	For a non-ambiguous short name of the ref append `:short`.
+	The option core.warnAmbiguousRefs is used to select the strict
+	abbreviation mode.
 
 objecttype::
 	The type of the object (`blob`, `tree`, `commit`, `tag`).
diff --git a/builtin-for-each-ref.c b/builtin-for-each-ref.c
index 2f323c6..f2af55a 100644
--- a/builtin-for-each-ref.c
+++ b/builtin-for-each-ref.c
@@ -696,7 +696,8 @@ static void populate_value(struct refinfo *ref)
 			if (formatp) {
 				formatp++;
 				if (!strcmp(formatp, "short"))
-					refname = get_short_ref(ref, 0);
+					refname = get_short_ref(ref,
+						warn_ambiguous_refs);
 				else
 					die("unknown refname format %s",
 					    formatp);
@@ -1013,6 +1014,9 @@ int cmd_for_each_ref(int argc, const char **argv, const char *prefix)
 		sort = default_sort();
 	sort_atom_limit = used_atom_cnt;
 
+	/* for warn_ambiguous_refs */
+	git_config(git_default_config, NULL);
+
 	memset(&cbdata, 0, sizeof(cbdata));
 	cbdata.grab_pattern = argv;
 	for_each_ref(grab_single_ref, &cbdata);
diff --git a/t/t6300-for-each-ref.sh b/t/t6300-for-each-ref.sh
index 8bfae44..f83be5d 100755
--- a/t/t6300-for-each-ref.sh
+++ b/t/t6300-for-each-ref.sh
@@ -279,10 +279,11 @@ test_expect_success 'Check for invalid refname format' '
 
 cat >expected <<\EOF
 heads/master
-master
+tags/master
 EOF
 
-test_expect_success 'Check ambiguous head and tag refs' '
+test_expect_success 'Check ambiguous head and tag refs (strict)' '
+	git config --bool core.warnambiguousrefs true &&
 	git checkout -b newtag &&
 	echo "Using $datestamp" > one &&
 	git add one &&
@@ -294,11 +295,22 @@ test_expect_success 'Check ambiguous head and tag refs' '
 '
 
 cat >expected <<\EOF
+heads/master
+master
+EOF
+
+test_expect_success 'Check ambiguous head and tag refs (loose)' '
+	git config --bool core.warnambiguousrefs false &&
+	git for-each-ref --format "%(refname:short)" refs/heads/master refs/tags/master >actual &&
+	test_cmp expected actual
+'
+
+cat >expected <<\EOF
 heads/ambiguous
 ambiguous
 EOF
 
-test_expect_success 'Check ambiguous head and tag refs II' '
+test_expect_success 'Check ambiguous head and tag refs II (loose)' '
 	git checkout master &&
 	git tag ambiguous testtag^0 &&
 	git branch ambiguous testtag^0 &&
-- 
tg: (6750239..) bw/utilize-it (depends on: bw/short_ref-warnAmbiguousRefs)