1

Is there a way to indent cl-flet, cl-labels etc. using the CL style without resorting to (setq lisp-indent-function #'common-lisp-indent-function)?

cl-indent.el claims that:

common-lisp-indent-function is also a suitable function for indenting Emacs lisp code.

But this is far from true. It misindents the :types of defcustoms, the docstring of define-minor-mode, and more.

1

Define the indentation for a given function/macro etc. by putting the indentation spec on the function etc. symbol as property common-lisp-indent-function. As one possible example:

(put 'cl-flet
     'common-lisp-indent-function
     '((&whole 4 &rest (&whole 1 &lambda &body)) &body))
  • 1
    But this doesn't work unless lisp-indent-function property is set to common-lisp-indent-function, right? That's what I find from my experiments. – Tianxiang Xiong Feb 3 '18 at 20:42
  • I tried (put 'cl-flet 'lisp-indent-function #'common-lisp-indent-function) so that common-lisp-indent-function applies only applies to cl-flet, but that's not indenting properly either. – Tianxiang Xiong Feb 3 '18 at 21:20
1

This is not possible with the current codebase, there is an open bug for it. Fixing it should be a matter of copying the functionality from cl-indent.el without getting the misindenting of defcustom, define-minor-mode, etc.

  • This bug report was last modified 6 years and 136 days ago. 🙄 – Tianxiang Xiong Feb 9 '18 at 2:03
  • 1
    @TianxiangXiong That does not mean patches aren't welcome. :) – Basil Feb 9 '18 at 2:43
0

The following code indents flet like lists. It's not perfect, because the sublist needs to be closed, before it is recognized.

(setq-default lisp-indent-function 'elisp-flet-indent-function)

(defvar elisp-flet-style-macros
  (let ((macs '(flet flet* values macrolet labels)))
    (append macs (mapcar (lambda (sym)
                           (intern (format "cl-%s" (symbol-name sym))))
                         macs))))

(dolist (mac elisp-flet-style-macros)
  (put mac 'lisp-indent-function 'defun))

(defun elisp-flet-indent-function (indent-point state)
  "Handle `flet'-like lists, otherwise call `lisp-indent-function'."
  (cond
   ((ignore-errors
      (save-excursion
        (backward-up-list 3)
        (down-list)
        (when (memq (intern (thing-at-point 'symbol))
                    elisp-flet-style-macros)
          (forward-sexp 2)
          (>= (point) indent-point))))
    (lisp-indent-defform state indent-point))
   (t (lisp-indent-function indent-point state))))
  • values shouldn't get this special treatment, should it? – npostavs Mar 2 '18 at 12:31

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.