path_excluded(): update API to less cache-entry centric

It was stupid of me to make the API too much cache-entry specific;
the caller may want to check arbitrary pathname without having a
corresponding cache-entry to see if a path is ignored.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/ls-files.c

@@ -200,6 +200,12 @@ static void show_ru_info(void)
 	}
 }
 
+static int ce_excluded(struct path_exclude_check *check, struct cache_entry *ce)
+{
+	int dtype = ce_to_dtype(ce);
+	return path_excluded(check, ce->name, ce_namelen(ce), &dtype);
+}
+
 static void show_files(struct dir_struct *dir)
 {
 	int i;
@@ -220,7 +226,7 @@ static void show_files(struct dir_struct *dir)
 		for (i = 0; i < active_nr; i++) {
 			struct cache_entry *ce = active_cache[i];
 			if ((dir->flags & DIR_SHOW_IGNORED) &&
-			    !path_excluded(&check, ce))
+			    !ce_excluded(&check, ce))
 				continue;
 			if (show_unmerged && !ce_stage(ce))
 				continue;
@@ -236,7 +242,7 @@ static void show_files(struct dir_struct *dir)
 			struct stat st;
 			int err;
 			if ((dir->flags & DIR_SHOW_IGNORED) &&
-			    !path_excluded(&check, ce))
+			    !ce_excluded(&check, ce))
 				continue;
 			if (ce->ce_flags & CE_UPDATE)
 				continue;

dir.c

@@ -593,31 +593,40 @@ void path_exclude_check_clear(struct path_exclude_check *check)
 }
 
 /*
- * Is the ce->name excluded?  This is for a caller like show_files() that
+ * Is this name excluded?  This is for a caller like show_files() that
  * do not honor directory hierarchy and iterate through paths that are
  * possibly in an ignored directory.
  *
  * A path to a directory known to be excluded is left in check->path to
  * optimize for repeated checks for files in the same excluded directory.
  */
-int path_excluded(struct path_exclude_check *check, struct cache_entry *ce)
+int path_excluded(struct path_exclude_check *check,
+		  const char *name, int namelen, int *dtype)
 {
-	int i, dtype;
+	int i;
 	struct strbuf *path = &check->path;
 
+	/*
+	 * we allow the caller to pass namelen as an optimization; it
+	 * must match the length of the name, as we eventually call
+	 * excluded() on the whole name string.
+	 */
+	if (namelen < 0)
+		namelen = strlen(name);
+
 	if (path->len &&
-	    path->len <= ce_namelen(ce) &&
-	    !memcmp(ce->name, path->buf, path->len) &&
-	    (!ce->name[path->len] || ce->name[path->len] == '/'))
+	    path->len <= namelen &&
+	    !memcmp(name, path->buf, path->len) &&
+	    (!name[path->len] || name[path->len] == '/'))
 		return 1;
 
 	strbuf_setlen(path, 0);
-	for (i = 0; ce->name[i]; i++) {
-		int ch = ce->name[i];
+	for (i = 0; name[i]; i++) {
+		int ch = name[i];
 
 		if (ch == '/') {
-			dtype = DT_DIR;
-			if (excluded(check->dir, path->buf, &dtype))
+			int dt = DT_DIR;
+			if (excluded(check->dir, path->buf, &dt))
 				return 1;
 		}
 		strbuf_addch(path, ch);
@@ -626,8 +635,7 @@ int path_excluded(struct path_exclude_check *check, struct cache_entry *ce)
 	/* An entry in the index; cannot be a directory with subentries */
 	strbuf_setlen(path, 0);
 
-	dtype = ce_to_dtype(ce);
-	return excluded(check->dir, ce->name, &dtype);
+	return excluded(check->dir, name, dtype);
 }
 
 static struct dir_entry *dir_entry_new(const char *pathname, int len)

dir.h

@@ -92,7 +92,8 @@ struct path_exclude_check {
 };
 extern void path_exclude_check_init(struct path_exclude_check *, struct dir_struct *);
 extern void path_exclude_check_clear(struct path_exclude_check *);
-extern int path_excluded(struct path_exclude_check *, struct cache_entry *);
+extern int path_excluded(struct path_exclude_check *, const char *, int namelen, int *dtype);
+
 
 extern int add_excludes_from_file_to_list(const char *fname, const char *base, int baselen,
 					  char **buf_p, struct exclude_list *which, int check_index);