When two buffers are compared for differences, M-x ediff-buffers does not indicate the specific characters that have changed within a word (ie "character-level" diffs). Most modern diff tools will show the diffs within a word.

Emacs seems to be missing this important (or obviously useful?) feature by default. How can I make Emacs display the diffs by character?

Update Here's M-x ediff-buffers diff1 diff2, using emacs -Q to ensure that my theme is not interferring: enter image description here

Here's the same text pasted into Meld: enter image description here

  • It looks like this problem is related to the theme you're using. In vanilla Emacs (24.4), differences between individual lines are highlighted. You can verify this by starting Emacs via emacs -Q and calling ediff-buffers on diff1 and diff2 as you normally would.
    – itsjeyd
    Commented Jan 14, 2015 at 11:35
  • I tried running with emacs -Q, added above. Also, I modified my question to address character-level diffs instead of intra-line diffs.
    – modulitos
    Commented Jan 14, 2015 at 13:29

2 Answers 2

(setq-default ediff-forward-word-function 'forward-char)

This feature is called "refining" in Ediff. You can hit * to refine the current hunk, or @ to turn on automatic refining whenever you move to a different hunk.

  • 1
    I modified my question to address the character-level diffs instead of the intra-line diffs. Is it possible to make Emacs show the diffs within a word?
    – modulitos
    Commented Jan 14, 2015 at 13:28

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