diff --check: do not unconditionally complain about trailing empty lines

Recently "git diff --check" learned to detect new trailing blank lines
just like "git apply --whitespace" does.  However this check should not
trigger unconditionally.  This patch makes it honor the whitespace
settings from core.whitespace and gitattributes.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/diff.c b/diff.c
index 8746c60b9cb634bf78911c34cad1ba5a1f93d5ec..6954f992c2f268e2733af1e312a48ac3bc27799b 100644 (file)
--- a/diff.c
+++ b/diff.c
@@ -1631,7 +1631,8 @@ static void builtin_checkdiff(const char *name_a, const char *name_b,
                ecb.priv = &data;
                xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
 
-               if (data.trailing_blanks_start) {
+               if ((data.ws_rule & WS_TRAILING_SPACE) &&
+                   data.trailing_blanks_start) {
                        fprintf(o->file, "%s:%d: ends with blank lines.\n",
                                data.filename, data.trailing_blanks_start);
                        data.status = 1; /* report errors */

diff --git a/t/t4019-diff-wserror.sh b/t/t4019-diff-wserror.sh
index 0d9cbb62615c0d94da784f63907989988b0e8151..7eae1f4500591799d656f1dde20cf15f296cf6e4 100755 (executable)
--- a/t/t4019-diff-wserror.sh
+++ b/t/t4019-diff-wserror.sh
@@ -13,7 +13,8 @@ test_expect_success setup '
        echo "  HT and SP indent" >>F &&
        echo "With trailing SP " >>F &&
        echo "Carriage ReturnQ" | tr Q "\015" >>F &&
-       echo "No problem" >>F
+       echo "No problem" >>F &&
+       echo >>F
 
 '
 
@@ -160,4 +161,21 @@ test_expect_success 'with cr-at-eol (attribute)' '
 
 '
 
+test_expect_success 'trailing empty lines (1)' '
+
+       rm -f .gitattributes &&
+       test_must_fail git diff --check >output &&
+       grep "ends with blank lines." output &&
+       grep "trailing whitespace" output
+
+'
+
+test_expect_success 'trailing empty lines (2)' '
+
+       echo "F -whitespace" >.gitattributes &&
+       git diff --check >output &&
+       ! test -s output
+
+'
+
 test_done