whitespace: we cannot "catch all errors known to git" anymore

Traditionally, "*.txt whitespace" in .gitattributes file has been an
instruction to catch _all_ classes of whitespace errors known to git.

This has to change, however, in order to introduce "tab-in-indent" which
is inherently incompatible with "indent-with-non-tab".  As we do not want
to break configuration of existing users, add a mechanism to allow marking
selected rules to be excluded from "all rules known to git".

Signed-off-by: Chris Webb <chris@arachsys.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/ws.c b/ws.c
index c0893386e6c8aa3af002e847d228dfc5ef64a9cf..f4afcddd4f3d41a920ee269c1750e5c5c6c0dfc7 100644 (file)
--- a/ws.c
+++ b/ws.c
@@ -10,7 +10,8 @@
 static struct whitespace_rule {
        const char *rule_name;
        unsigned rule_bits;
-       unsigned loosens_error;
+       unsigned loosens_error:1,
+               exclude_default:1;
 } whitespace_rule_names[] = {
        { "trailing-space", WS_TRAILING_SPACE, 0 },
        { "space-before-tab", WS_SPACE_BEFORE_TAB, 0 },
@@ -82,7 +83,8 @@ unsigned whitespace_rule(const char *pathname)
                        unsigned all_rule = 0;
                        int i;
                        for (i = 0; i < ARRAY_SIZE(whitespace_rule_names); i++)
-                               if (!whitespace_rule_names[i].loosens_error)
+                               if (!whitespace_rule_names[i].loosens_error &&
+                                   !whitespace_rule_names[i].exclude_default)
                                        all_rule |= whitespace_rule_names[i].rule_bits;
                        return all_rule;
                } else if (ATTR_FALSE(value)) {