/usr/share/emacs/site-lisp/ghc-mod/ghc-check.el is in ghc-mod-el 5.8.0.0-1.
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The actual contents of the file can be viewed below.
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;;;
;;; ghc-check.el
;;;
;; Author: Kazu Yamamoto <Kazu@Mew.org>
;; Created: Mar 9, 2014
;;; Code:
(require 'ghc-func)
(require 'ghc-process)
(require 'button)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; stolen from flymake.el
(defface ghc-face-error
'((((supports :underline (:style wave)))
:underline (:style wave :color "orangered"))
(t
:inherit error))
"Face used for error lines."
:group 'ghc)
(defface ghc-face-warn
'((((supports :underline (:style wave)))
:underline (:style wave :color "gold"))
(t
:inherit warning))
"Face used for warning lines."
:group 'ghc)
(defface ghc-face-hole
'((((supports :underline (:style wave)))
:underline (:style wave :color "purple"))
(t
:inherit warning))
"Face used for hole lines."
:group 'ghc)
(defvar ghc-check-error-fringe (propertize "!" 'display '(left-fringe exclamation-mark)))
(defvar ghc-check-warning-fringe (propertize "?" 'display '(left-fringe question-mark)))
(defvar ghc-check-hole-fringe (propertize "_" 'display '(left-fringe horizontal-bar)))
(defvar ghc-display-error nil
"*How to display errors/warnings when using 'M-n' and 'M-p':
nil do not display errors/warnings.
'minibuffer display errors/warnings in the minibuffer.
'other-buffer display errors/warnings in a new buffer.
")
(defvar ghc-display-hole 'other-buffer
"*How to display hole information when using 'C-c C-j' and 'C-c C-h'
'minibuffer display errors/warnings in the minibuffer.
'other-buffer display errors/warnings in the a new buffer"
)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defun ghc-check-syntax ()
(interactive)
;; Only check syntax of visible buffers
(when (and (buffer-file-name)
(file-exists-p (buffer-file-name)))
(ghc-with-process (ghc-check-send)
'ghc-check-callback
(lambda () (setq mode-line-process " -:-")))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(ghc-defstruct hilit-info file line msg err hole coln)
(defun ghc-check-send ()
(let ((file (buffer-file-name)))
(if ghc-check-command
(let ((opts (ghc-haskell-list-of-string ghc-hlint-options)))
(if opts
(format "lint %s %s\n" opts file)
(format "lint %s\n" file)))
(format "check %s\n" file))))
(defun ghc-haskell-list-of-string (los)
(when los
(concat "["
(mapconcat (lambda (x) (concat "\"" x "\"")) los ", ")
"]")))
(defun ghc-check-callback (status)
(cond
((eq status 'ok)
(let* ((errs (ghc-read-lisp-this-buffer))
(infos (ghc-to-info errs)))
(cond
(infos
(let ((file ghc-process-original-file)
(buf ghc-process-original-buffer))
(ghc-check-highlight-original-buffer file buf infos)))
(t
(ghc-with-current-buffer ghc-process-original-buffer
(remove-overlays (point-min) (point-max) 'ghc-check t))))
(ghc-with-current-buffer ghc-process-original-buffer
(let ((len (length infos)))
(if (= len 0)
(setq mode-line-process "")
(let* ((errs (ghc-filter 'ghc-hilit-info-get-err infos))
(elen (length errs))
(wlen (- len elen)))
(setq mode-line-process (format " %d:%d" elen wlen)))))
(force-mode-line-update))))
(t
(let* ((err (ghc-unescape-string (buffer-substring-no-properties (+ (point) 3) (point-max))))
(info (ghc-make-hilit-info
:file "Fail errors:"
:line 0
:coln 0
:msg err
:err t
:hole nil))
(infos (list info))
(file ghc-process-original-file)
(buf ghc-process-original-buffer))
(ghc-check-highlight-original-buffer file buf infos))
(ghc-with-current-buffer ghc-process-original-buffer
(setq mode-line-process " failed")
(force-mode-line-update)))))
(defun ghc-to-info (errs)
;; [^\t] to include \n.
(let ((regex "^\\([^\n]*\\):\\([0-9]+\\):\\([0-9]+\\): *\\([^\t]+\\)")
infos)
(dolist (err errs (nreverse infos))
(when (string-match regex err)
(let* ((file (expand-file-name (match-string 1 err) ghc-process-root)) ;; for Windows
(line (string-to-number (match-string 2 err)))
(coln (string-to-number (match-string 3 err)))
(msg (match-string 4 err))
(wrn (string-match "^Warning" msg))
(hole (save-match-data
(when (string-match "Found hole .\\(_[_[:alnum:]]*\\)." msg)
(match-string 1 msg))))
(info (ghc-make-hilit-info
:file file
:line line
:coln coln
:msg msg
:err (and (not wrn) (not hole))
:hole hole)))
(unless (member info infos)
(ghc-add infos info)))))))
(defun ghc-check-highlight-original-buffer (ofile buf infos)
(ghc-with-current-buffer buf
(remove-overlays (point-min) (point-max) 'ghc-check t)
(save-excursion
(goto-char (point-min))
(dolist (info infos)
(let ((line (ghc-hilit-info-get-line info))
(msg (ghc-hilit-info-get-msg info))
(file (ghc-hilit-info-get-file info))
(err (ghc-hilit-info-get-err info))
(hole (ghc-hilit-info-get-hole info))
(coln (ghc-hilit-info-get-coln info))
beg end ovl)
;; FIXME: This is the Shlemiel painter's algorithm.
;; If this is a bottleneck for a large code, let's fix.
(goto-char (point-min))
(cond
((file-equal-p ofile file)
(if hole
(progn
(forward-line (1- line))
(forward-char (1- coln))
(setq beg (point))
(forward-char (length hole))
(setq end (point)))
(progn
(forward-line (1- line))
(forward-char (1- coln))
(setq beg (point))
(forward-sexp)
;; (skip-chars-forward "^[:space:]" (line-end-position))
(setq end (point)))))
(t
(setq beg (point))
(forward-line)
(setq end (point))))
(setq ovl (make-overlay beg end))
(overlay-put ovl 'ghc-check t)
(overlay-put ovl 'ghc-file file)
(overlay-put ovl 'ghc-msg msg)
(overlay-put ovl 'help-echo msg)
(overlay-put ovl 'ghc-hole hole)
(let ((fringe (if err ghc-check-error-fringe (if hole ghc-check-hole-fringe ghc-check-warning-fringe)))
(face (if err 'ghc-face-error (if hole 'ghc-face-hole 'ghc-face-warn))))
(overlay-put ovl 'before-string fringe)
(overlay-put ovl 'face face)))))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defun ghc-overlay-p (ovl)
(overlay-get ovl 'ghc-check))
(defun ghc-check-overlay-at (p)
(ghc-filter 'ghc-overlay-p (overlays-at p)))
(ghc-defstruct file-msgs file msgs)
(defun ghc-get-errors-over-warnings ()
(let ((ovls (ghc-check-overlay-at (point))))
(when ovls
(let ((msgs (mapcar (lambda (ovl) (overlay-get ovl 'ghc-msg)) ovls))
(file (overlay-get (car ovls) 'ghc-file))
errs wrns)
(dolist (msg msgs)
(if (string-match "^Warning" msg)
(ghc-add wrns msg)
(ghc-add errs msg)))
(ghc-make-file-msgs :file file :msgs (nconc errs wrns))))))
(defun ghc-display-errors ()
(interactive)
(let ((file-msgs (ghc-get-errors-over-warnings)))
(if (null file-msgs)
(message "No errors or warnings")
(let ((file (ghc-file-msgs-get-file file-msgs))
(msgs (ghc-file-msgs-get-msgs file-msgs)))
(ghc-display
nil
(lambda ()
(insert file "\n\n")
(mapc (lambda (x) (insert x "\n\n")) msgs)))))))
(defun ghc-display-errors-to-minibuf ()
(let ((file-msgs (ghc-get-errors-over-warnings)))
(if (null file-msgs)
(message "No errors or warnings")
(let* ((file (ghc-file-msgs-get-file file-msgs))
(msgs (ghc-file-msgs-get-msgs file-msgs))
(errmsg (mapconcat 'identity msgs "\n"))
(buffile buffer-file-name))
(if (string-equal buffile file)
(message "%s" errmsg)
(message "%s\n\n%s" file errmsg))))))
(defun ghc-get-only-holes ()
(let ((ovls (ghc-check-overlay-at (point))))
(when ovls
(let ((msgs (mapcar (lambda (ovl) (overlay-get ovl 'ghc-msg)) ovls))
(file (overlay-get (car ovls) 'ghc-file))
holes)
(dolist (msg msgs)
(if (string-match "Found hole" msg)
(ghc-add holes msg)
nil))
(ghc-make-file-msgs :file file :msgs holes)))))
;; Based on http://superuser.com/questions/331895/how-to-get-emacs-to-highlight-and-link-file-paths
(defun find-file-button (button)
(let ((text (buffer-substring (button-start button) (button-end button))))
(when (string-match "\\(/[^:]*\\):\\([[:digit:]]+\\):\\([[:digit:]]+\\)" text)
(let* ((file (match-string 1 text))
(line (string-to-number (match-string 2 text)))
(coln (string-to-number (match-string 3 text)))
(buf (find-file file)))
(with-current-buffer buf
(let* ((this-line (line-number-at-pos))
(diff (- line this-line)))
(beginning-of-line)
(forward-line diff)
(forward-char (1- coln))))))))
(define-button-type 'find-file-button
'follow-link t
'help-echo "mouse-2, RET: Go to definition"
'action #'find-file-button)
(defun buttonize-buffer ()
"turn all file paths into buttons"
(save-excursion
(goto-char (point-min))
(while (re-search-forward "/[^ \t:]*:[[:digit:]]+:[[:digit:]]+" nil t)
(make-button (match-beginning 0) (match-end 0) :type 'find-file-button))))
(defun ghc-display-holes ()
(interactive)
(let ((file-msgs (ghc-get-only-holes)))
(if (null file-msgs)
(message "No holes")
(let ((msgs (ghc-file-msgs-get-msgs file-msgs)))
(ghc-display
nil
(lambda ()
(progn
(mapc (lambda (x) (insert x "\n\n")) msgs)
(buttonize-buffer))))))))
(defun ghc-display-holes-to-minibuf ()
(let ((file-msgs (ghc-get-only-holes)))
(if (null file-msgs)
(message "No holes")
(let* ((file (ghc-file-msgs-get-file file-msgs))
(msgs (ghc-file-msgs-get-msgs file-msgs))
(errmsg (mapconcat 'identity msgs "\n"))
(buffile buffer-file-name))
(if (string-equal buffile file)
(message "%s" errmsg)
(message "%s\n\n%s" file errmsg))))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defun ghc-goto-prev-error ()
(interactive)
(let* ((here (point))
(ovls0 (ghc-check-overlay-at here))
(end (if ovls0 (overlay-start (car ovls0)) here))
(ovls1 (overlays-in (point-min) end))
(ovls2 (ghc-filter (lambda (ovl) (overlay-get ovl 'ghc-check)) ovls1))
(pnts (mapcar 'overlay-start ovls2)))
(if pnts (goto-char (apply 'max pnts))))
(cond
((eq ghc-display-error 'minibuffer) (ghc-display-errors-to-minibuf))
((eq ghc-display-error 'other-buffer) (ghc-display-errors))))
(defun ghc-goto-next-error ()
(interactive)
(let* ((here (point))
(ovls0 (ghc-check-overlay-at here))
(beg (if ovls0 (overlay-end (car ovls0)) here))
(ovls1 (overlays-in beg (point-max)))
(ovls2 (ghc-filter (lambda (ovl) (overlay-get ovl 'ghc-check)) ovls1))
(pnts (mapcar 'overlay-start ovls2)))
(if pnts (goto-char (apply 'min pnts))))
(cond
((eq ghc-display-error 'minibuffer) (ghc-display-errors-to-minibuf))
((eq ghc-display-error 'other-buffer) (ghc-display-errors))))
(defun ghc-goto-prev-hole ()
(interactive)
(let* ((here (point))
(ovls0 (ghc-check-overlay-at here))
(end (if ovls0 (overlay-start (car ovls0)) here))
(ovls1 (overlays-in (point-min) end))
(ovls2 (ghc-filter (lambda (ovl) (overlay-get ovl 'ghc-check)) ovls1))
(ovls3 (ghc-filter (lambda (ovl) (overlay-get ovl 'ghc-hole)) ovls2))
(pnts (mapcar 'overlay-start ovls3)))
(if pnts (goto-char (apply 'max pnts))))
(cond
((eq ghc-display-hole 'minibuffer) (ghc-display-holes-to-minibuf))
((eq ghc-display-hole 'other-buffer) (ghc-display-holes))))
(defun ghc-goto-next-hole ()
(interactive)
(let* ((here (point))
(ovls0 (ghc-check-overlay-at here))
(beg (if ovls0 (overlay-end (car ovls0)) here))
(ovls1 (overlays-in beg (point-max)))
(ovls2 (ghc-filter (lambda (ovl) (overlay-get ovl 'ghc-check)) ovls1))
(ovls3 (ghc-filter (lambda (ovl) (overlay-get ovl 'ghc-hole)) ovls2))
(pnts (mapcar 'overlay-start ovls3)))
(if pnts (goto-char (apply 'min pnts))))
(cond
((eq ghc-display-hole 'minibuffer) (ghc-display-holes-to-minibuf))
((eq ghc-display-hole 'other-buffer) (ghc-display-holes))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defun ghc-check-insert-from-warning ()
(interactive)
(let ((ret t))
(dolist (data (delete-dups (mapcar (lambda (ovl) (overlay-get ovl 'ghc-msg)) (ghc-check-overlay-at (point)))) ret)
(save-excursion
(cond
((string-match "Inferred type: \\|no type signature:" data)
(beginning-of-line)
(insert-before-markers (ghc-extract-type data) "\n"))
((string-match "lacks an accompanying binding" data)
(beginning-of-line)
(when (looking-at "^\\([^ ]+\\) *::")
(save-match-data
(forward-line)
(if (not (bolp)) (insert "\n")))
(insert (match-string 1) " = undefined\n")))
;; GHC 7.8 uses Unicode for single-quotes.
((string-match "Not in scope: type constructor or class .\\([^\n]+\\)." data)
(let ((sym (match-string 1 data)))
(ghc-ins-mod sym)))
((string-match "Not in scope: data constructor .\\([^\n]+\\)." data)
;; if the type of data constructor, it would be nice.
(let ((sym (match-string 1 data)))
(ghc-ins-mod sym)))
((string-match "\n[ ]+.\\([^ ]+\\). is a data constructor of .\\([^\n]+\\).\n" data)
(let* ((old (match-string 1 data))
(type-const (match-string 2 data))
(new (format "%s(%s)" type-const old)))
(ghc-check-replace old new)))
((string-match "Not in scope: .\\([^\n]+\\)." data)
(let ((sym (match-string 1 data)))
(if (or (string-match "\\." sym) ;; qualified
(y-or-n-p (format "Import module for %s?" sym)))
(ghc-ins-mod sym)
(unless (re-search-forward "^$" nil t)
(goto-char (point-max))
(insert "\n"))
(insert "\n" (ghc-enclose sym) " = undefined\n"))))
((string-match "Pattern match(es) are non-exhaustive" data)
(let* ((fn (ghc-get-function-name))
(arity (ghc-get-function-arity fn)))
(ghc-insert-underscore fn arity)))
((string-match "Found:\n[ ]+\\([^\t]+\\)\nWhy not:\n[ ]+\\([^\t]+\\)" data)
(let ((old (match-string 1 data))
(new (match-string 2 data)))
(ghc-check-replace old new)))
((string-match "Found hole .\\(_[_[:alnum:]]*\\). with type: \\([^\t\n]+\\)" data)
(let ((old (match-string 1 data))
(new (match-string 2 data)))
(ghc-check-replace old new)))
(t
(setq ret nil)))))))
(defun ghc-check-replace (old new)
(beginning-of-line)
(when (search-forward old nil t)
(let ((end (point)))
(search-backward old nil t)
(delete-region (point) end))
(insert new)))
(defun ghc-extract-type (str)
(with-temp-buffer
(insert str)
(goto-char (point-min))
(when (re-search-forward "Inferred type: \\|no type signature:\\( \\|\n +\\)?" nil t)
(delete-region (point-min) (point)))
(when (re-search-forward " forall [^.]+\\." nil t)
(replace-match ""))
(while (re-search-forward "\n +" nil t)
(replace-match " "))
(goto-char (point-min))
(while (re-search-forward "\\[Char\\]" nil t)
(replace-match "String"))
(buffer-substring-no-properties (point-min) (point-max))))
(defun ghc-get-function-name ()
(save-excursion
(beginning-of-line)
(when (looking-at "\\([^ ]+\\) ")
(match-string 1))))
(defun ghc-get-function-arity (fn)
(when fn
(save-excursion
(let ((regex (format "^%s *::" (regexp-quote fn))))
(when (re-search-backward regex nil t)
(ghc-get-function-arity0))))))
(defun ghc-get-function-arity0 ()
(let ((end (save-excursion (end-of-line) (point)))
(arity 0))
(while (search-forward "->" end t)
(setq arity (1+ arity)))
arity))
(defun ghc-insert-underscore (fn ar)
(when fn
(let ((arity (or ar 1)))
(save-excursion
(goto-char (point-max))
(re-search-backward (format "^%s *::" (regexp-quote fn)))
(forward-line)
(re-search-forward "^$" nil t)
(insert fn)
(dotimes (_i arity)
(insert " _"))
(insert " = error \"" fn "\"\n")))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defun ghc-jump-file ()
(interactive)
(let* ((ovl (car (ghc-check-overlay-at 1)))
(file (if ovl (overlay-get ovl 'ghc-file))))
(if file (find-file file))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defvar ghc-hlint-options nil "*Hlint options")
(defvar ghc-check-command nil)
(defun ghc-toggle-check-command ()
(interactive)
(setq ghc-check-command (not ghc-check-command))
(if ghc-check-command
(message "Syntax check with hlint")
(message "Syntax check with GHC")))
(provide 'ghc-check)
|