runstatus: do not recurse into subdirectories if not needed

This speeds up the case when you run git-status, having an untracked
subdirectory containing huge amounts of files.

Signed-off-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/dir.c b/dir.c
index e2f472ba7f5d3e5146f110dd3eaae9e5494854e2..96389b32e66af24896220e4738cd93bf2ac75704 100644 (file)
--- a/dir.c
+++ b/dir.c
@@ -283,7 +283,7 @@ static int dir_exists(const char *dirname, int len)
  * Also, we ignore the name ".git" (even if it is not a directory).
  * That likely will not change.
  */
-static int read_directory_recursive(struct dir_struct *dir, const char *path, const char *base, int baselen)
+static int read_directory_recursive(struct dir_struct *dir, const char *path, const char *base, int baselen, int check_only)
 {
        DIR *fdir = opendir(path);
        int contents = 0;
@@ -314,7 +314,6 @@ static int read_directory_recursive(struct dir_struct *dir, const char *path, co
 
                        switch (DTYPE(de)) {
                        struct stat st;
-                       int subdir, rewind_base;
                        default:
                                continue;
                        case DT_UNKNOWN:
@@ -328,26 +327,30 @@ static int read_directory_recursive(struct dir_struct *dir, const char *path, co
                        case DT_DIR:
                                memcpy(fullname + baselen + len, "/", 2);
                                len++;
-                               rewind_base = dir->nr;
-                               subdir = read_directory_recursive(dir, fullname, fullname,
-                                                       baselen + len);
                                if (dir->show_other_directories &&
-                                   (subdir || !dir->hide_empty_directories) &&
                                    !dir_exists(fullname, baselen + len)) {
-                                       /* Rewind the read subdirectory */
-                                       while (dir->nr > rewind_base)
-                                               free(dir->entries[--dir->nr]);
+                                       if (dir->hide_empty_directories &&
+                                           !read_directory_recursive(dir,
+                                                   fullname, fullname,
+                                                   baselen + len, 1))
+                                               continue;
                                        break;
                                }
-                               contents += subdir;
+
+                               contents += read_directory_recursive(dir,
+                                       fullname, fullname, baselen + len, 0);
                                continue;
                        case DT_REG:
                        case DT_LNK:
                                break;
                        }
-                       add_name(dir, fullname, baselen + len);
                        contents++;
+                       if (check_only)
+                               goto exit_early;
+                       else
+                               add_name(dir, fullname, baselen + len);
                }
+exit_early:
                closedir(fdir);
 
                pop_exclude_per_directory(dir, exclude_stk);
@@ -393,7 +396,7 @@ int read_directory(struct dir_struct *dir, const char *path, const char *base, i
                }
        }
 
-       read_directory_recursive(dir, path, base, baselen);
+       read_directory_recursive(dir, path, base, baselen, 0);
        qsort(dir->entries, dir->nr, sizeof(struct dir_entry *), cmp_name);
        return dir->nr;
 }