walker: drop fields of `struct walker` which are always 1

After the previous commit, both users of `struct walker` set `get_tree`,
`get_history` and `get_all` to 1. Drop those fields and simplify the
walker implementation accordingly.

Let's hope that any out-of-tree users will not mind this change. They
should notice that the compilation fails as they try to set these
fields. (If they do not set them, note that `get_http_walker()` leaves
them undefined, so the behavior will have been undefined all the time.)

Signed-off-by: Martin Ågren <martin.agren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

http-fetch.c

@@ -56,9 +56,6 @@ int cmd_main(int argc, const char **argv)
 
 	http_init(NULL, url, 0);
 	walker = get_http_walker(url);
-	walker->get_tree = 1;
-	walker->get_history = 1;
-	walker->get_all = 1;
 	walker->get_verbosely = get_verbosely;
 	walker->get_recover = get_recover;
 

remote-curl.c

@@ -797,9 +797,6 @@ static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 		targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 
 	walker = get_http_walker(url.buf);
-	walker->get_all = 1;
-	walker->get_tree = 1;
-	walker->get_history = 1;
 	walker->get_verbosely = options.verbosity >= 3;
 	walker->get_recover = 0;
 	ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);

walker.c

@@ -72,6 +72,8 @@ static struct commit_list *complete = NULL;
 
 static int process_commit(struct walker *walker, struct commit *commit)
 {
+	struct commit_list *parents;
+
 	if (parse_commit(commit))
 		return -1;
 
@@ -86,19 +88,14 @@ static int process_commit(struct walker *walker, struct commit *commit)
 
 	walker_say(walker, "walk %s\n", oid_to_hex(&commit->object.oid));
 
-	if (walker->get_tree) {
-		if (process(walker, &commit->tree->object))
+	if (process(walker, &commit->tree->object))
+		return -1;
+
+	for (parents = commit->parents; parents; parents = parents->next) {
+		if (process(walker, &parents->item->object))
 			return -1;
-		if (!walker->get_all)
-			walker->get_tree = 0;
-	}
-	if (walker->get_history) {
-		struct commit_list *parents = commit->parents;
-		for (; parents; parents = parents->next) {
-			if (process(walker, &parents->item->object))
-				return -1;
-		}
 	}
+
 	return 0;
 }
 

walker.h

@@ -9,9 +9,6 @@ struct walker {
 	void (*prefetch)(struct walker *, unsigned char *sha1);
 	int (*fetch)(struct walker *, unsigned char *sha1);
 	void (*cleanup)(struct walker *);
-	int get_tree;
-	int get_history;
-	int get_all;
 	int get_verbosely;
 	int get_recover;