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With M-q (aka fill-paragraph), it is possible to format a single line of text nicely.

Is there a command or function which does a similar thing for lisps s-expressions?

It should break one-liner lisp expression where it is reasonable.
A command or function is searched.
I do not want a mode which is constantly formating the s-expressions.

Edit: Thanks to Drews comment I realized that fill-paragraph does not get called by M-q in paredit mode.

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  • Check out lispy. It has commands for this: O and M. github.com/abo-abo/lispy/blob/master/README.md
    – John Kitchin
    Commented Jun 26, 2017 at 11:35
  • @John Kitchin I will have a look, but i need to drop paredit for this(?)
    – jue
    Commented Jun 26, 2017 at 11:38
  • M-q does work for sexps - it indents consistently, including indenting same-line comments etc. Its effects vary by programming language, though. But it does not split or join lines (that is typically a personal style decision, often on a case-by-case basis).
    – Drew
    Commented Jun 26, 2017 at 13:23
  • @Drew thanks for this comment! Now I realized that paredit is redefining M-q.
    – jue
    Commented Jun 26, 2017 at 17:06
  • I don't think you would have to give up paredit. Just M-x the commands those keys are bound to.
    – John Kitchin
    Commented Jun 27, 2017 at 13:58

1 Answer 1

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Perhaps you're looking for indent-pp-sexp, which is bound to C-M-q by default in emacs lisp mode. With a prefix argument (e.g. C-u C-M-q) this will "pretty print" the sexp at point.

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  • 1
    C-M-q alone does not, but C-u C-M-q does the job, thank you
    – jue
    Commented Jun 26, 2017 at 14:20
  • This doesn't work, it doesn't break the lines into multiple lines and indent. This is the same as normal indent. I'm using Scheme mode. fill-paragraph break line input multiple lines this does not.
    – jcubic
    Commented Jan 9, 2021 at 15:33

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