revwalk: get rid of obsolete marking code

We've now moved to code that's closer to git and produces the output
during the preparation phase, so we no longer process the commits as
part of generating the output.

This makes a chunk of code redundant, as we're simply short-circuiting
it by detecting we've processed the commits alrady.

src/revwalk.c

@@ -13,6 +13,7 @@
 #include "revwalk.h"
 #include "git2/revparse.h"
 #include "merge.h"
+#include "vector.h"
 
 GIT__USE_OIDMAP
 
@@ -41,97 +42,6 @@ git_commit_list_node *git_revwalk__commit_lookup(
 	return commit;
 }
 
-typedef git_array_t(git_commit_list_node*) commit_list_node_array;
-
-static bool interesting_arr(commit_list_node_array arr)
-{
-	git_commit_list_node **n;
-	size_t i = 0, size;
-
-	size = git_array_size(arr);
-	for (i = 0; i < size; i++) {
-		n = git_array_get(arr, i);
-		if (!*n)
-			break;
-
-		if (!(*n)->uninteresting)
-			return true;
-	}
-
-	return false;
-}
-
-static int mark_uninteresting(git_revwalk *walk, git_commit_list_node *commit)
-{
-	int error;
-	unsigned short i;
-	commit_list_node_array pending = GIT_ARRAY_INIT;
-	git_commit_list_node **tmp;
-
-	assert(commit);
-
-	do {
-		commit->uninteresting = 1;
-
-		if ((error = git_commit_list_parse(walk, commit)) < 0)
-			return error;
-
-		for (i = 0; i < commit->out_degree; ++i)
-			if (!commit->parents[i]->uninteresting) {
-				git_commit_list_node **node = git_array_alloc(pending);
-				GITERR_CHECK_ALLOC(node);
-				*node = commit->parents[i];
-			}
-
-		tmp = git_array_pop(pending);
-		commit = tmp ? *tmp : NULL;
-
-	} while (commit != NULL && interesting_arr(pending));
-
-	git_array_clear(pending);
-
-	return 0;
-}
-
-static int process_commit(git_revwalk *walk, git_commit_list_node *commit, int hide)
-{
-	int error;
-
-	if (!hide && walk->hide_cb)
-		hide = walk->hide_cb(&commit->oid, walk->hide_cb_payload);
-
-	if (hide && mark_uninteresting(walk, commit) < 0)
-		return -1;
-
-	if (commit->seen)
-		return 0;
-
-	commit->seen = 1;
-
-	if ((error = git_commit_list_parse(walk, commit)) < 0)
-		return error;
-
-	if (!hide)
-		return walk->enqueue(walk, commit);
-
-	return 0;
-}
-
-static int process_commit_parents(git_revwalk *walk, git_commit_list_node *commit)
-{
-	unsigned short i, max;
-	int error = 0;
-
-	max = commit->out_degree;
-	if (walk->first_parent && commit->out_degree)
-		max = 1;
-
-	for (i = 0; i < max && !error; ++i)
-		error = process_commit(walk, commit->parents[i], commit->uninteresting);
-
-	return error;
-}
-
 static int push_commit(git_revwalk *walk, const git_oid *oid, int uninteresting, int from_glob)
 {
 	git_oid commit_id;
@@ -321,17 +231,12 @@ static int revwalk_enqueue_unsorted(git_revwalk *walk, git_commit_list_node *com
 
 static int revwalk_next_timesort(git_commit_list_node **object_out, git_revwalk *walk)
 {
-	int error;
 	git_commit_list_node *next;
 
-	while ((next = git_pqueue_pop(&walk->iterator_time)) != NULL)
-		if (!next->uninteresting) {
-			if ((error = process_commit_parents(walk, next)) < 0)
-				return error;
-
-			*object_out = next;
-			return 0;
-		}
+	if ((next = git_pqueue_pop(&walk->iterator_time)) != NULL) {
+		*object_out = next;
+		return 0;
+	}
 
 	giterr_clear();
 	return GIT_ITEROVER;
@@ -339,17 +244,12 @@ static int revwalk_next_timesort(git_commit_list_node **object_out, git_revwalk
 
 static int revwalk_next_unsorted(git_commit_list_node **object_out, git_revwalk *walk)
 {
-	int error;
 	git_commit_list_node *next;
 
-	while ((next = git_commit_list_pop(&walk->iterator_rand)) != NULL)
-		if (!next->uninteresting) {
-			if ((error = process_commit_parents(walk, next)) < 0)
-				return error;
-
-			*object_out = next;
-			return 0;
-		}
+	if ((next = git_commit_list_pop(&walk->iterator_rand)) != NULL) {
+		*object_out = next;
+		return 0;
+	}
 
 	giterr_clear();
 	return GIT_ITEROVER;
@@ -375,19 +275,6 @@ static int revwalk_next_reverse(git_commit_list_node **object_out, git_revwalk *
 	return *object_out ? 0 : GIT_ITEROVER;
 }
 
-static int contains(git_pqueue *list, git_commit_list_node *node)
-{
-	size_t i;
-
-	for (i = 0; i < git_pqueue_size(list); i++) {
-		git_commit_list_node *commit = git_pqueue_get(list, i);
-		if (commit == node)
-			return 1;
-	}
-
-	return 0;
-}
-
 static void mark_parents_uninteresting(git_commit_list_node *commit)
 {
 	unsigned short i;