misc/path_utils: new mp_stripext shorthand

There are at least two users of this functionality, the filename/no-ext
property and the screenshot template %F specifier. The latter uses a
buggy private version. So split out what the former does, so it can be
reused.

Author: WhitePeter

misc/path_utils.c

@@ -100,6 +100,12 @@ char *mp_splitext(const char *path, bstr *root)
     return (char *)split + 1;
 }
 
+char *mp_stripext(void *talloc_ctx, const char *s)
+{
+    bstr root;
+    return mp_splitext(s, &root) ? bstrto0(talloc_ctx, root) : (char *)s;
+}
+
 bool mp_path_is_absolute(struct bstr path)
 {
     if (path.len && strchr(mp_path_separators, path.start[0]))

misc/path_utils.h

@@ -37,6 +37,9 @@ char *mp_basename(const char *path);
  */
 char *mp_splitext(const char *path, bstr *root);
 
+// This is a shorthand to remove the extension
+char *mp_stripext(void *talloc_ctx, const char *s);
+
 /* Return struct bstr referencing directory part of path, or if that
  * would be empty, ".".
  */