+
+(defvar mode-line-coding-system-map
+ (let ((map (make-sparse-keymap)))
+ (define-key map [mode-line mouse-3]
+ (lambda (e)
+ (interactive "e")
+ (save-selected-window
+ (select-window (posn-window (event-start e)))
+ (when (and enable-multibyte-characters
+ buffer-file-coding-system)
+ (describe-coding-system buffer-file-coding-system)))))
+ (purecopy map))
+ "Local keymap for the coding-system part of the mode line.")
+
+
+(defun mode-line-change-eol ()
+ "Cycle through the various possible kinds of end-of-line styles."
+ (interactive)
+ (let ((eol (coding-system-eol-type buffer-file-coding-system)))
+ (set-buffer-file-coding-system
+ (cond ((eq eol 0) 'dos) ((eq eol 1) 'mac) (t 'unix)))))
+
+(defvar mode-line-eol-desc-cache nil)
+
+(defun mode-line-eol-desc ()
+ (let* ((eol (coding-system-eol-type buffer-file-coding-system))
+ (mnemonic (coding-system-eol-type-mnemonic buffer-file-coding-system))
+ (desc (assq eol mode-line-eol-desc-cache)))
+ (if (and desc (eq (cadr desc) mnemonic))
+ (cddr desc)
+ (if desc (setq mode-line-eol-desc-cache nil)) ;Flush the cache if stale.
+ (setq desc
+ (propertize
+ mnemonic
+ 'help-echo (format "%s end-of-line; mouse-3 to cycle"
+ (if (eq eol 0) "Unix-style LF"
+ (if (eq eol 1) "Dos-style CRLF"
+ (if (eq eol 2) "Mac-style CR"
+ "Undecided"))))
+ 'keymap
+ (eval-when-compile
+ (let ((map (make-sparse-keymap)))
+ (define-key map [mode-line mouse-3] 'mode-line-change-eol)
+ map))))
+ (push (cons eol (cons mnemonic desc)) mode-line-eol-desc-cache)
+ desc)))
+