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M-t insert "foo _ _ = undefined" for non-exhaustive pattern.

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This commit is contained in:
Kazu Yamamoto 2012-02-27 11:01:18 +09:00
parent 35c312b009
commit e875778b49
1 changed files with 37 additions and 0 deletions
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37
elisp/ghc-flymake.el
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@ -114,6 +114,10 @@
(goto-char (point-max))
(insert "\n")))
(insert "\n" (match-string 1 data) " = undefined\n"))
((string-match "Pattern match(es) are non-exhaustive" data)
(let* ((fn (ghc-get-function-name))
(arity (ghc-get-function-arity fn)))
(ghc-insert-underscore fn arity)))
((string-match "Found:\0[ ]*\\([^\0]+\\)\0Why not:\0[ ]*\\([^\0]+\\)" data)
(let ((old (match-string 1 data))
(new (match-string 2 data)))
@ -124,6 +128,39 @@
(delete-region (point) end))
(insert new))))))))
(defun ghc-get-function-name ()
(save-excursion
(beginning-of-line)
(when (looking-at "\\([^ ]+\\) ")
(match-string 1))))
(defun ghc-get-function-arity (fn)
(when fn
(save-excursion
(let ((regex (format "^%s *::" (regexp-quote fn))))
(when (re-search-backward regex nil t)
(ghc-get-function-arity0))))))
(defun ghc-get-function-arity0 ()
(let ((end (save-excursion (end-of-line) (point)))
(arity 0))
(while (search-forward "->" end t)
(setq arity (1+ arity)))
arity))
(defun ghc-insert-underscore (fn ar)
(when fn
(let ((arity (or ar 1)))
(save-excursion
(goto-char (point-max))
(re-search-backward (format "^%s *::" (regexp-quote fn)))
(forward-line)
(re-search-forward "^$" nil t)
(insert fn)
(dotimes (i arity)
(insert " _"))
(insert " = undefined\n")))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defun ghc-flymake-err-get-title (x) (nth 0 x))