;;; extern/compat.el --- Compatible API  -*- lexical-binding: t; -*-
;;; Commentary:
;;; Code:

(eask-defvc< 27
  (defun directory-files-recursively (dir regexp
                                          &optional include-directories predicate
                                          follow-symlinks)
    "..."
    (let* ((result nil)
           (files nil)
           (dir (directory-file-name dir))
           ;; When DIR is "/", remote file names like "/method:" could
           ;; also be offered.  We shall suppress them.
           (tramp-mode (and tramp-mode (file-remote-p (expand-file-name dir)))))
      (dolist (file (sort (file-name-all-completions "" dir)
                          'string<))
        (unless (member file '("./" "../"))
          (if (directory-name-p file)
              (let* ((leaf (substring file 0 (1- (length file))))
                     (full-file (concat dir "/" leaf)))
                ;; Don't follow symlinks to other directories.
                (when (and (or (not (file-symlink-p full-file))
                               (and (file-symlink-p full-file)
                                    follow-symlinks))
                           ;; Allow filtering subdirectories.
                           (or (eq predicate nil)
                               (eq predicate t)
                               (funcall predicate full-file)))
                  (let ((sub-files
                         (if (eq predicate t)
                             (ignore-error file-error
                               (directory-files-recursively
                                full-file regexp include-directories
                                predicate follow-symlinks))
                           (directory-files-recursively
                            full-file regexp include-directories
                            predicate follow-symlinks))))
                    (setq result (nconc result sub-files))))
                (when (and include-directories
                           (string-match regexp leaf))
                  (setq result (nconc result (list full-file)))))
            (when (string-match regexp file)
              (push (concat dir "/" file) files)))))
      (nconc result (nreverse files)))))

(eask-defvc< 28
  (defun always (&rest _arguments)
    "Ignore ARGUMENTS, do nothing, and return t.
This function accepts any number of arguments in ARGUMENTS.
Also see `ignore'."
    t))

;;; extern/compat.el ends here