emacs - 突出显示 emacs 缓冲区中缺少哪些文件名

Question

在 GNU Emacs 中，我可以使用类似假设的“flyexist.el”之类的东西——我有一个缓冲区，其中包含绝对 (Unix) 文件名(加上一些围绕它们的附加文本)。大多数文件都存在，但有些文件丢失了。我想运行一个函数来突出显示丢失的文件(可能带有红色覆盖)。这个函数需要找出缓冲区中的哪些文本看起来像一个文件名(一些误报是可以的)，然后使用 file-exists-p 处理它。

例如，假设我的缓冲区包含

Some random text mentioning /file/that/does/exist.txt, 
some more random text, and a /file/that/does/not-exist.txt

我想突出显示第二个文件。

这样的东西已经存在了吗？

Answer 1

我是 emacs 黑客的新手……这是我的“次要模式”版本。

(defvar filehi-path-re "\\([/$][[:alnum:]$-_.]+\\)+"
  "Regexp used for path matching.")


(defface filehi-file-existing
  '((t (:foreground "White" :background "Green")))
  "Face for existing files.")

(defface filehi-file-missing
  '((t (:foreground "Yellow" :background "Red")))
  "Face for missing files.")

(defun filehi-check-and-highlight (start end)
  "Check if substring is existing file path and highlight it."
    (remove-overlays start end 'name 'filehi-highlight)
    (let ((overlay (make-overlay start end)))
      (overlay-put overlay 'name 'filehi-highlight)
      (overlay-put overlay 'face (if (file-exists-p (substitute-in-file-name
                                                     (buffer-substring start end)))
                                     'filehi-file-existing
                                   'filehi-file-missing))))


(defun filehi-highlight-file-paths (&optional start end _ignore)
   "Run through the buffer and highliht file paths."
    (save-excursion
      (save-match-data ; fixes problem with dabbrev (and may be more...)
        (remove-overlays (point-min) end 'name 'filehi-highlight)
        (let ((prev-end (point-min)))
          (goto-char (point-min)) ; FIXME use something like greedy
                                        ; search-backward
          (while (and (<= (point) end)
                      (re-search-forward filehi-path-re nil t))
            (filehi-check-and-highlight (match-beginning 0) (match-end 0)))))))


(define-minor-mode filehi-mode
  "Minor mode for highlighting existing file paths.
May conflict with other modes..."
  nil " Filehi" nil
  (if filehi-mode
      (progn ; enable mode
        (make-local-hook 'after-change-functions)
        (filehi-highlight-file-paths (point-min) (point-max))
        (add-hook 'after-change-functions 'filehi-highlight-file-paths nil t))
    ; disable mode
    (remove-hook 'after-change-functions 'filehi-highlight-file-paths t)
    (remove-overlays (point-min) (point-max) 'name 'filehi-highlight)))