[PATCH 2/4] ref-filter: use contains_result enum consistently

[Jeff King]

Commit cbc60b672 (git tag --contains: avoid stack overflow,
2014-04-24) adapted the -1/0/1 contains status into a
tri-state enum. However, some of the code still used the
numeric values, or assumed that no/yes correspond to C's
boolean true/false.

Let's switch to using the symbolic values everywhere, which
will make it easier to change them.

Signed-off-by: Jeff King <p...@peff.net>
---
 ref-filter.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/ref-filter.c b/ref-filter.c
index 6546dba73..631978a4f 100644
--- a/ref-filter.c
+++ b/ref-filter.c
@@ -1513,20 +1513,20 @@ static enum contains_result contains_test(struct commit 
*candidate,
 {
        /* was it previously marked as containing a want commit? */
        if (candidate->object.flags & TMP_MARK)
-               return 1;
+               return CONTAINS_YES;
        /* or marked as not possibly containing a want commit? */
        if (candidate->object.flags & UNINTERESTING)
-               return 0;
+               return CONTAINS_NO;
        /* or are we it? */
        if (in_commit_list(want, candidate)) {
                candidate->object.flags |= TMP_MARK;
-               return 1;
+               return CONTAINS_YES;
        }
 
        if (parse_commit(candidate) < 0)
-               return 0;
+               return CONTAINS_NO;
 
-       return -1;
+       return CONTAINS_UNKNOWN;
 }
 
 static void push_to_contains_stack(struct commit *candidate, struct 
contains_stack *contains_stack)
@@ -1540,7 +1540,7 @@ static enum contains_result contains_tag_algo(struct 
commit *candidate,
                const struct commit_list *want)
 {
        struct contains_stack contains_stack = { 0, 0, NULL };
-       int result = contains_test(candidate, want);
+       enum contains_result result = contains_test(candidate, want);
 
        if (result != CONTAINS_UNKNOWN)
                return result;
@@ -1557,7 +1557,7 @@ static enum contains_result contains_tag_algo(struct 
commit *candidate,
                }
                /*
                 * If we just popped the stack, parents->item has been marked,
-                * therefore contains_test will return a meaningful 0 or 1.
+                * therefore contains_test will return a meaningful yes/no.
                 */
                else switch (contains_test(parents->item, want)) {
                case CONTAINS_YES:
@@ -1579,7 +1579,7 @@ static enum contains_result contains_tag_algo(struct 
commit *candidate,
 static int commit_contains(struct ref_filter *filter, struct commit *commit)
 {
        if (filter->with_commit_tag_algo)
-               return contains_tag_algo(commit, filter->with_commit);
+               return contains_tag_algo(commit, filter->with_commit) == 
CONTAINS_YES;
        return is_descendant_of(commit, filter->with_commit);
 }
 
-- 
2.12.0.445.g818af77e0