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In Emacs, how do I inspect what has been modified in a buffer (before saving and overwriting the file)?

(In a sense, the requested action is an analog of git status and git add -i showing what has been modified, only the comparison should be done between the buffer contents (in Emacs's memory) and the file on disk.)

Sometime, I forget what has been modified in a buffer, and would like to call a command to remind me.

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Some people might even like to "bind" this behavior with the saving or killing-the-buffer command: so that the diff is demonstrated before one decides whether to save or kill the buffer (that's similar to the interactive way of how darcs record works). –  imz -- Ivan Zakharyaschev Jun 17 at 22:44

1 Answer 1

up vote 7 down vote accepted

M-xdiff-buffer-with-file

I've just found it by looking through files.el where I felt there is such a command:

View the differences between BUFFER and its associated file.

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