branch: give better message when no names specified for rename

diff --git a/t/t4020-diff-external.sh b/t/t4020-diff-external.sh
index a7602cf923d95a51643753ce44fa65cf406aba9c..2e7d73f0906e6a2808706236328470b2d855e9f9 100755 (executable)
--- a/t/t4020-diff-external.sh
+++ b/t/t4020-diff-external.sh
@@ -4,8 +4,6 @@ test_description='external diff interface test'
 
 . ./test-lib.sh
 
-_z40=0000000000000000000000000000000000000000
-
 test_expect_success setup '
 
        test_tick &&
@@ -50,7 +48,53 @@ test_expect_success 'GIT_EXTERNAL_DIFF environment and --no-ext-diff' '
 
 '
 
+test_expect_success SYMLINKS 'typechange diff' '
+       rm -f file &&
+       ln -s elif file &&
+       GIT_EXTERNAL_DIFF=echo git diff  | {
+               read path oldfile oldhex oldmode newfile newhex newmode &&
+               test "z$path" = zfile &&
+               test "z$oldmode" = z100644 &&
+               test "z$newhex" = "z$_z40" &&
+               test "z$newmode" = z120000 &&
+               oh=$(git rev-parse --verify HEAD:file) &&
+               test "z$oh" = "z$oldhex"
+       } &&
+       GIT_EXTERNAL_DIFF=echo git diff --no-ext-diff >actual &&
+       git diff >expect &&
+       test_cmp expect actual
+'
+
+test_expect_success 'diff.external' '
+       git reset --hard &&
+       echo third >file &&
+       test_config diff.external echo &&
+       git diff | {
+               read path oldfile oldhex oldmode newfile newhex newmode &&
+               test "z$path" = zfile &&
+               test "z$oldmode" = z100644 &&
+               test "z$newhex" = "z$_z40" &&
+               test "z$newmode" = z100644 &&
+               oh=$(git rev-parse --verify HEAD:file) &&
+               test "z$oh" = "z$oldhex"
+       }
+'
+
+test_expect_success 'diff.external should apply only to diff' '
+       test_config diff.external echo &&
+       git log -p -1 HEAD |
+       grep "^diff --git a/file b/file"
+'
+
+test_expect_success 'diff.external and --no-ext-diff' '
+       test_config diff.external echo &&
+       git diff --no-ext-diff |
+       grep "^diff --git a/file b/file"
+'
+
 test_expect_success 'diff attribute' '
+       git reset --hard &&
+       echo third >file &&
 
        git config diff.parrot.command echo &&
 
@@ -115,12 +159,25 @@ test_expect_success 'diff attribute and --no-ext-diff' '
 
 '
 
+test_expect_success 'GIT_EXTERNAL_DIFF trumps diff.external' '
+       >.gitattributes &&
+       test_config diff.external "echo ext-global" &&
+       GIT_EXTERNAL_DIFF="echo ext-env" git diff | grep ext-env
+'
+
+test_expect_success 'attributes trump GIT_EXTERNAL_DIFF and diff.external' '
+       test_config diff.foo.command "echo ext-attribute" &&
+       test_config diff.external "echo ext-global" &&
+       echo "file diff=foo" >.gitattributes &&
+       GIT_EXTERNAL_DIFF="echo ext-env" git diff | grep ext-attribute
+'
+
 test_expect_success 'no diff with -diff' '
        echo >.gitattributes "file -diff" &&
        git diff | grep Binary
 '
 
-echo NULZbetweenZwords | perl -pe 'y/Z/\000/' > file
+echo NULZbetweenZwords | "$PERL_PATH" -pe 'y/Z/\000/' > file
 
 test_expect_success 'force diff with "diff"' '
        echo >.gitattributes "file diff" &&