git-mailsplit: with maildirs not only process cur/, but also new/

When saving patches to a maildir with e.g. mutt, the files are put into
the new/ subdirectory of the maildir, not cur/.  This makes git-am state
"Nothing to do.".  This patch lets git-mailsplit additional check new/
after reading cur/.

This was reported by Joey Hess through
 http://bugs.debian.org/447396

Signed-off-by: Gerrit Pape <pape@smarden.org>
Acked-by: Jeff King <peff@peff.net>
Acked-by: Alex Riesen <raa.lkml@gmail.com>
Acked-by: Fernando J. Pereda <ferdy@gentoo.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin-mailsplit.c

@@ -101,20 +101,29 @@ static int populate_maildir_list(struct path_list *list, const char *path)
 {
 	DIR *dir;
 	struct dirent *dent;
+	char name[PATH_MAX];
+	char *subs[] = { "cur", "new", NULL };
+	char **sub;
 
-	if ((dir = opendir(path)) == NULL) {
-		error("cannot opendir %s (%s)", path, strerror(errno));
-		return -1;
+	for (sub = subs; *sub; ++sub) {
+		snprintf(name, sizeof(name), "%s/%s", path, *sub);
+		if ((dir = opendir(name)) == NULL) {
+			if (errno == ENOENT)
+				continue;
+			error("cannot opendir %s (%s)", name, strerror(errno));
+			return -1;
+		}
+
+		while ((dent = readdir(dir)) != NULL) {
+			if (dent->d_name[0] == '.')
+				continue;
+			snprintf(name, sizeof(name), "%s/%s", *sub, dent->d_name);
+			path_list_insert(name, list);
+		}
+
+		closedir(dir);
 	}
 
-	while ((dent = readdir(dir)) != NULL) {
-		if (dent->d_name[0] == '.')
-			continue;
-		path_list_insert(dent->d_name, list);
-	}
-
-	closedir(dir);
-
 	return 0;
 }
 
@@ -122,19 +131,17 @@ static int split_maildir(const char *maildir, const char *dir,
 	int nr_prec, int skip)
 {
 	char file[PATH_MAX];
-	char curdir[PATH_MAX];
 	char name[PATH_MAX];
 	int ret = -1;
 	int i;
 	struct path_list list = {NULL, 0, 0, 1};
 
-	snprintf(curdir, sizeof(curdir), "%s/cur", maildir);
-	if (populate_maildir_list(&list, curdir) < 0)
+	if (populate_maildir_list(&list, maildir) < 0)
 		goto out;
 
 	for (i = 0; i < list.nr; i++) {
 		FILE *f;
-		snprintf(file, sizeof(file), "%s/%s", curdir, list.items[i].path);
+		snprintf(file, sizeof(file), "%s/%s", maildir, list.items[i].path);
 		f = fopen(file, "r");
 		if (!f) {
 			error("cannot open mail %s (%s)", file, strerror(errno));
@@ -152,10 +159,9 @@ static int split_maildir(const char *maildir, const char *dir,
 		fclose(f);
 	}
 
-	path_list_clear(&list, 1);
-
 	ret = skip;
 out:
+	path_list_clear(&list, 1);
 	return ret;
 }