/usr/share/emacs/site-lisp/ghc-mod/ghc-process.el is in ghc-mod-el 5.6.0.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; ghc-process.el
;;;
;; Author: Kazu Yamamoto <Kazu@Mew.org>
;; Created: Mar 9, 2014
;;; Code:
(require 'ghc-func)
(defvar ghc-debug-options nil)
;; (setq ghc-debug-options '("-v9"))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defvar ghc-process-running nil)
(defvar ghc-process-file-mapping nil)
(defvar-local ghc-process-process-name nil)
(defvar-local ghc-process-original-buffer nil)
(defvar-local ghc-process-original-file nil)
(defvar-local ghc-process-root nil)
(defvar ghc-command "ghc-mod")
(defvar ghc-report-errors t "Report GHC errors to *GHC Error* buffer")
(defvar ghc-error-buffer "*GHC Error*")
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defun ghc-get-project-root ()
(ghc-run-ghc-mod '("root")))
(defun ghc-with-process (cmd async-after-callback &optional sync-before-hook)
(unless ghc-process-process-name
(setq ghc-process-process-name (ghc-get-project-root)))
(when (and ghc-process-process-name (not ghc-process-running))
(setq ghc-process-running t)
(if sync-before-hook (funcall sync-before-hook))
(let* ((cbuf (current-buffer))
(name ghc-process-process-name)
(root (file-name-as-directory ghc-process-process-name))
(buf (get-buffer-create (concat " ghc-mod:" name)))
(file (buffer-file-name))
(cpro (get-process name)))
;; setting root in the original buffer, sigh
(setq ghc-process-root root)
(ghc-with-current-buffer buf
(setq ghc-process-original-buffer cbuf)
(setq ghc-process-original-file file)
(setq ghc-process-root root)
(let ((pro (ghc-get-process cpro name buf root))
(map-cmd (format "map-file %s\n" file)))
; (unmap-cmd (format "unmap-file %s\n" file)))
(when (buffer-modified-p (current-buffer))
(setq ghc-process-file-mapping t)
(setq ghc-process-async-after-callback nil)
(erase-buffer)
(when ghc-debug
(ghc-with-debug-buffer
(insert (format "%% %s" map-cmd))
(insert "CONTENTS + EOT\n")))
(process-send-string pro map-cmd)
(with-current-buffer cbuf
(save-restriction
(widen)
(process-send-region pro (point-min) (point-max))))
(process-send-string pro "\n\004\n")
(condition-case nil
(let ((inhibit-quit nil))
(while ghc-process-file-mapping
(accept-process-output pro 0.1 nil t)))
(quit
(setq ghc-process-running nil)
(setq ghc-process-file-mapping nil))))
;; command
(setq ghc-process-async-after-callback async-after-callback)
(erase-buffer)
(when ghc-debug
(ghc-with-debug-buffer
(insert (format "%% %s" cmd))))
(process-send-string pro cmd)
;;; this needs to be done asyncrounously after the command actually
;;; finished, gah
;; (when do-map-file
;; (when ghc-debug
;; (ghc-with-debug-buffer
;; (insert (format "%% %s" unmap-cmd))))
;; (process-send-string pro unmap-cmd))
pro)))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defun ghc-get-process (cpro name buf root)
(cond
((not cpro)
(ghc-start-process name buf root))
((not (eq (process-status cpro) 'run))
(delete-process cpro)
(ghc-start-process name buf root))
(t cpro)))
(defun ghc-start-process (name buf root)
(let* ((default-directory root)
(process-connection-type nil) ;; using PIPE due to ^D
(opts (append ghc-debug-options
'("-b" "\n" "-l" "--line-prefix=O: ,E: ")
(ghc-make-ghc-options)
'("legacy-interactive")))
(pro (apply 'start-process name buf ghc-command opts)))
(set-process-filter pro 'ghc-process-filter)
(set-process-sentinel pro 'ghc-process-sentinel)
(set-process-query-on-exit-flag pro nil)
pro))
(defun ghc-process-filter (process string)
(let* ((pbuf (process-buffer process))
(tbufname (concat " tmp " (buffer-name pbuf)))
tbuf)
(if (not (get-buffer pbuf))
(setq ghc-process-running nil) ;; just in case
(ghc-with-current-buffer pbuf
(when ghc-debug
(ghc-with-debug-buffer
(insert string)))
(with-current-buffer (get-buffer-create tbufname)
(setq tbuf (current-buffer))
(goto-char (point-max))
(insert string)
(goto-char (point-min))
(let ((cont t) end out)
(while (and cont (not (eobp)) ghc-process-running)
(cond
((looking-at "^O: ")
(setq out t))
((looking-at "^E: ")
(setq out nil))
(t
(setq cont nil)))
(when cont
(forward-line)
(unless (bolp) (setq cont nil)))
(when cont
(delete-region 1 4)
(setq end (point))
(if out
(with-current-buffer pbuf
(goto-char (point-max))
(insert-buffer-substring tbuf 1 end))
(when ghc-report-errors
(with-current-buffer (get-buffer-create ghc-error-buffer)
(setq buffer-read-only t)
(let* ((buffer-read-only nil)
(inhibit-read-only t)
(cbuf (current-buffer))
cwin)
(unless (get-buffer-window cbuf) (display-buffer cbuf))
(setq cwin (get-buffer-window cbuf))
(with-selected-window cwin
(goto-char (point-max))
(insert-buffer-substring tbuf 1 end)
(set-buffer-modified-p nil))
(redisplay)))))
(delete-region 1 end)))))
(goto-char (point-max))
(forward-line -1)
(cond
((looking-at "^OK$")
(delete-region (point) (point-max))
(setq ghc-process-file-mapping nil)
(when ghc-process-async-after-callback
(goto-char (point-min))
(funcall ghc-process-async-after-callback 'ok)
(setq ghc-process-running nil)))
((looking-at "^NG ")
(funcall ghc-process-async-after-callback 'ng)
(setq ghc-process-running nil)))))))
(defun ghc-process-sentinel (_process _event)
(setq ghc-process-running nil)
(setq ghc-process-file-mapping nil))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defvar ghc-process-rendezvous nil)
(defvar ghc-process-num-of-results nil)
(defvar ghc-process-results nil)
(defun ghc-sync-process (cmd &optional n)
(unless ghc-process-running
(setq ghc-process-rendezvous nil)
(setq ghc-process-results nil)
(setq ghc-process-num-of-results (or n 1))
(let ((pro (ghc-with-process cmd 'ghc-sync-process-callback nil)))
;; ghc-process-running is now t.
;; But if the process exits abnormally, it is set to nil.
(condition-case nil
(let ((inhibit-quit nil))
(while (and (null ghc-process-rendezvous) ghc-process-running)
(accept-process-output pro 0.1 nil t)))
(quit
(setq ghc-process-running nil))))
ghc-process-results))
(defun ghc-sync-process-callback (status)
(cond
((eq status 'ok)
(let* ((n ghc-process-num-of-results)
(ret (if (= n 1)
(ghc-read-lisp-this-buffer)
(ghc-read-lisp-list-this-buffer n))))
(setq ghc-process-results ret)))
(t
(setq ghc-process-results nil)))
(setq ghc-process-num-of-results nil)
(setq ghc-process-rendezvous t))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defun ghc-kill-process ()
(interactive)
(when (eq major-mode 'haskell-mode)
(let* ((name ghc-process-process-name)
(cpro (if name (get-process name))))
(if (not cpro)
(message "No ghc-mod process")
(delete-process cpro)
(message "ghc-mod process was killed")))))
(provide 'ghc-process)
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