Merge pull request #3037 from libgit2/cmn/hide-then-push

Handle hide-then-push in the revwalk

include/git2/revwalk.h

@@ -90,15 +90,17 @@ GIT_EXTERN(int) git_revwalk_new(git_revwalk **out, git_repository *repo);
 GIT_EXTERN(void) git_revwalk_reset(git_revwalk *walker);
 
 /**
- * Mark a commit to start traversal from.
+ * Add a new root for the traversal
  *
- * The given OID must belong to a committish on the walked
- * repository.
+ * The pushed commit will be marked as one of the roots from which to
+ * start the walk. This commit may not be walked if it or a child is
+ * hidden.
+ *
+ * At least one commit must be pushed onto the walker before a walk
+ * can be started.
  *
- * The given commit will be used as one of the roots
- * when starting the revision walk. At least one commit
- * must be pushed onto the walker before a walk can
- * be started.
+ * The given id must belong to a committish on the walked
+ * repository.
  *
  * @param walk the walker being used for the traversal.
  * @param id the oid of the commit to start from.
@@ -135,7 +137,7 @@ GIT_EXTERN(int) git_revwalk_push_head(git_revwalk *walk);
 /**
  * Mark a commit (and its ancestors) uninteresting for the output.
  *
- * The given OID must belong to a committish on the walked
+ * The given id must belong to a committish on the walked
  * repository.
  *
  * The resolved commit and all its parents will be hidden from the

src/revwalk.c

@@ -144,6 +144,10 @@ static int push_commit(git_revwalk *walk, const git_oid *oid, int uninteresting,
 	if (commit == NULL)
 		return -1; /* error already reported by failed lookup */
 
+	/* A previous hide already told us we don't want this commit  */
+	if (commit->uninteresting)
+		return 0;
+
 	if (uninteresting)
 		walk->did_hide = 1;
 	else

tests/revwalk/basic.c

@@ -314,6 +314,23 @@ void test_revwalk_basic__disallow_non_commit(void)
 	cl_git_fail(git_revwalk_push(_walk, &oid));
 }
 
+void test_revwalk_basic__hide_then_push(void)
+{
+	git_oid oid;
+	int i = 0;
+
+	revwalk_basic_setup_walk(NULL);
+	cl_git_pass(git_oid_fromstr(&oid, "5b5b025afb0b4c913b4c338a42934a3863bf3644"));
+
+	cl_git_pass(git_revwalk_hide(_walk, &oid));
+	cl_git_pass(git_revwalk_push(_walk, &oid));
+
+	while (git_revwalk_next(&oid, _walk) == 0)
+		i++;
+
+	cl_assert_equal_i(i, 0);
+}
+
 void test_revwalk_basic__push_range(void)
 {
 	revwalk_basic_setup_walk(NULL);