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Windows 10, Emacs 25.1.

Suppose I open file D:/temp/test/myfile.txt. But in the in the mode line show only file name (myfile.txt).

But I need to show FULL path to file: D:/temp/test/myfile.txt

This path can show on mode line OR in the frame title. How I can do this?

4

The function (buffer-file-name) returns full path of the file you are visiting.

To use in frame title:

    (setq frame-title-format
          '("" invocation-name ": "
            (:eval
             (if (buffer-file-name)
                 (abbreviate-file-name (buffer-file-name))
               "%b"))))

To use it in the mode-line you can do the same, but for mode-line-format variable. If you need more help see C-h v mode-line-format

You can also use %f, like (setq-default frame-title-format "%b (%f)")

For a more thorough explanation see here and here

  • +1 for mentioning C-h v mode-line-format. I would only add that that same docstring explains the meaning of identifiers like %b, %f, and many more, which apply to both mode-line-format and frame-title-format. From C-h v frame-title-format: This variable has the same structure as ‘mode-line-format’, except that the %c, %C, and %l constructs are ignored. It is used only on frames for which no explicit name has been set (see ‘modify-frame-parameters’). – Kaushal Modi Jun 8 '17 at 16:52

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