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    <p>I am new to emacs hacking... Here is my "minor-mode" version.</p> <pre><code>(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 (&amp;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 (&lt;= (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))) </code></pre>
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    1. POHighlight which of the file names in emacs buffer are missing
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    1. COThanks, that is awesome. Since your solution was immediately useful and the most complete, I'm "Accept"ing it as the answer. Are you considering hosting that code in e.g. github, with proper licensing etc.?
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    2. COExpanding environment variables is easy - just added one function call (see diff) and changed regexp. Elisp reference is your friend! As for hosting and licensing, you are free to do with this code anything you want. I don't want to maintain it :)
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