ghc-mod/elisp/ghc-flymake.el

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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; ghc-flymake.el
;;;
;; Author: Kazu Yamamoto <Kazu@Mew.org>
;; Created: Mar 12, 2010
;;; Code:
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(require 'flymake)
(require 'ghc-func)
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defvar ghc-hlint-options nil "*Hlint options")
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(defconst ghc-flymake-allowed-file-name-masks
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'("\\.l?hs$" ghc-flymake-init))
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(defconst ghc-flymake-err-line-patterns
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'("^\\(.*\\):\\([0-9]+\\):\\([0-9]+\\):[ ]*\\(.+\\)" 1 2 3 4))
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(add-to-list 'flymake-allowed-file-name-masks
ghc-flymake-allowed-file-name-masks)
(add-to-list 'flymake-err-line-patterns
ghc-flymake-err-line-patterns)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(defun ghc-flymake-init ()
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(list ghc-module-command (ghc-flymake-command (flymake-init-create-temp-buffer-copy 'flymake-create-temp-inplace))))
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(defvar ghc-flymake-command nil) ;; nil: check, t: lint
(defun ghc-flymake-command (file)
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(if ghc-flymake-command
(let ((hopts (ghc-mapconcat (lambda (x) (list "-h" x)) ghc-hlint-options)))
`(,@hopts "lint" ,file))
`(,@(ghc-make-ghc-options) "check" ,file)))
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(defun ghc-flymake-toggle-command ()
(interactive)
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(setq ghc-flymake-command (not ghc-flymake-command))
(if ghc-flymake-command
(message "Syntax check with hlint")
(message "Syntax check with GHC")))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defun ghc-flymake-display-errors ()
(interactive)
(if (not (ghc-flymake-have-errs-p))
(message "No errors or warnings")
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(let ((title (ghc-flymake-err-title))
(errs (ghc-flymake-err-list)))
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(ghc-display
nil
(lambda (&rest ignore)
(insert title "\n\n")
(mapc (lambda (x) (insert x "\n")) errs))))))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(defun ghc-flymake-jump ()
(interactive)
(if (not (ghc-flymake-have-errs-p))
(message "No errors or warnings")
(let* ((acts (ghc-flymake-act-list))
(act (car acts)))
(if (not act)
(message "No destination")
(eval act)))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(defun ghc-extract-type (str)
(with-temp-buffer
(insert str)
(goto-char (point-min))
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(when (re-search-forward "Inferred type: \\|no type signature:\\( \\|\0 +\\)?" nil t)
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(delete-region (point-min) (point)))
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(when (re-search-forward " forall [^.]+\\." nil t)
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(replace-match ""))
(while (re-search-forward "\0 +" nil t)
(replace-match " "))
(goto-char (point-min))
(while (re-search-forward "\\[Char\\]" nil t)
(replace-match "String"))
(re-search-forward "\0" nil t)
(buffer-substring-no-properties (point-min) (1- (point)))))
(defun ghc-flymake-insert-from-warning ()
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(interactive)
(dolist (data (ghc-flymake-err-list))
(save-excursion
(cond
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((string-match "Inferred type: \\|no type signature:" data)
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(beginning-of-line)
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(insert (ghc-extract-type data) "\n"))
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((string-match "lacks an accompanying binding" data)
(beginning-of-line)
(when (looking-at "^\\([^ ]+\\) *::")
(save-match-data
(forward-line)
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(if (not (bolp)) (insert "\n")))
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(insert (match-string 1) " = undefined\n")))
((string-match "Not in scope: `\\([^']+\\)'" data)
(save-match-data
(unless (re-search-forward "^$" nil t)
(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)))
(beginning-of-line)
(when (search-forward old nil t)
(let ((end (point)))
(search-backward old nil t)
(delete-region (point) end))
(insert new))))))))
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(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 " _"))
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(insert " = error \"" fn "\"")))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defun ghc-flymake-err-get-title (x) (nth 0 x))
(defun ghc-flymake-err-get-errs (x) (nth 1 x))
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(defun ghc-flymake-err-get-err-msg (x) (nth 0 x))
(defun ghc-flymake-err-get-err-act (x) (nth 1 x))
(defalias 'ghc-flymake-have-errs-p 'ghc-flymake-data)
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(defun ghc-flymake-data ()
(let* ((line-no (flymake-current-line-no))
(info (nth 0 (flymake-find-err-info flymake-err-info line-no))))
(flymake-make-err-menu-data line-no info)))
(defun ghc-flymake-err-title ()
(ghc-flymake-err-get-title (ghc-flymake-data)))
(defun ghc-flymake-err-list ()
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(mapcar 'ghc-flymake-err-get-err-msg (ghc-flymake-err-get-errs (ghc-flymake-data))))
(defun ghc-flymake-act-list ()
(mapcar 'ghc-flymake-err-get-err-act (ghc-flymake-err-get-errs (ghc-flymake-data))))
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(provide 'ghc-flymake)