Move init_skiplist() outside of fsck

init_skiplist() took a file consisting of SHA-1s and comments and added
the objects to an oidset.  This functionality is useful for other
commands.

Signed-off-by: Barret Rhoden <brho@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

fsck.c

@@ -181,41 +181,6 @@ static int fsck_msg_type(enum fsck_msg_id msg_id,
 	return msg_type;
 }
 
-static void init_skiplist(struct fsck_options *options, const char *path)
-{
-	FILE *fp;
-	struct strbuf sb = STRBUF_INIT;
-	struct object_id oid;
-
-	fp = fopen(path, "r");
-	if (!fp)
-		die("Could not open skip list: %s", path);
-	while (!strbuf_getline(&sb, fp)) {
-		const char *p;
-		const char *hash;
-
-		/*
-		 * Allow trailing comments, leading whitespace
-		 * (including before commits), and empty or whitespace
-		 * only lines.
-		 */
-		hash = strchr(sb.buf, '#');
-		if (hash)
-			strbuf_setlen(&sb, hash - sb.buf);
-		strbuf_trim(&sb);
-		if (!sb.len)
-			continue;
-
-		if (parse_oid_hex(sb.buf, &oid, &p) || *p != '\0')
-			die("Invalid SHA-1: %s", sb.buf);
-		oidset_insert(&options->skiplist, &oid);
-	}
-	if (ferror(fp))
-		die_errno("Could not read '%s'", path);
-	fclose(fp);
-	strbuf_release(&sb);
-}
-
 static int parse_msg_type(const char *str)
 {
 	if (!strcmp(str, "error"))
@@ -284,7 +249,7 @@ void fsck_set_msg_types(struct fsck_options *options, const char *values)
 		if (!strcmp(buf, "skiplist")) {
 			if (equal == len)
 				die("skiplist requires a path");
-			init_skiplist(options, buf + equal + 1);
+			oidset_parse_file(&options->skiplist, buf + equal + 1);
 			buf += len + 1;
 			continue;
 		}

oidset.c

@@ -35,3 +35,38 @@ void oidset_clear(struct oidset *set)
 	kh_release_oid(&set->set);
 	oidset_init(set, 0);
 }
+
+void oidset_parse_file(struct oidset *set, const char *path)
+{
+	FILE *fp;
+	struct strbuf sb = STRBUF_INIT;
+	struct object_id oid;
+
+	fp = fopen(path, "r");
+	if (!fp)
+		die("Could not open skip list: %s", path);
+	while (!strbuf_getline(&sb, fp)) {
+		const char *p;
+		const char *hash;
+
+		/*
+		 * Allow trailing comments, leading whitespace
+		 * (including before commits), and empty or whitespace
+		 * only lines.
+		 */
+		hash = strchr(sb.buf, '#');
+		if (hash)
+			strbuf_setlen(&sb, hash - sb.buf);
+		strbuf_trim(&sb);
+		if (!sb.len)
+			continue;
+
+		if (parse_oid_hex(sb.buf, &oid, &p) || *p != '\0')
+			die("Invalid SHA-1: %s", sb.buf);
+		oidset_insert(set, &oid);
+	}
+	if (ferror(fp))
+		die_errno("Could not read '%s'", path);
+	fclose(fp);
+	strbuf_release(&sb);
+}

oidset.h

@@ -73,6 +73,13 @@ int oidset_remove(struct oidset *set, const struct object_id *oid);
  */
 void oidset_clear(struct oidset *set);
 
+/**
+ * Add the contents of the file 'path' to an initialized oidset.  Each line is
+ * an unabbreviated SHA-1.  Comments begin with '#', and trailing comments are
+ * allowed.  Leading whitespace and empty or white-space only lines are ignored.
+ */
+void oidset_parse_file(struct oidset *set, const char *path);
+
 struct oidset_iter {
 	kh_oid_t *set;
 	khiter_t iter;