/usr/share/emacs/site-lisp/ghc-mod/ghc-ins-mod.el is in ghc-mod-el 5.4.0.0-1build1.
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-ins-mod.el
;;;
;; Author: Kazu Yamamoto <Kazu@Mew.org>
;; Created: Dec 27, 2011
(require 'ghc-process)
;;; Code:
(defun ghc-insert-module ()
(interactive)
(let* ((expr0 (ghc-things-at-point))
(expr (ghc-read-expression expr0)))
(ghc-ins-mod expr)))
(defvar ghc-preferred-modules '("Control.Applicative"
"Data.ByteString"
"Data.Text"
"Text.Parsec"
"System.FilePath"
"System.Directory"))
(defun ghc-reorder-modules (mods)
(catch 'loop
(dolist (pmod ghc-preferred-modules)
(if (member pmod mods)
(throw 'loop (cons pmod (delete pmod mods)))))
mods))
(defun ghc-ins-mod (expr)
(let (prefix fun mods)
(if (not (string-match "^\\([^.]+\\)\\\.\\([^.]+\\)$" expr))
(setq fun expr)
(setq prefix (match-string 1 expr))
(setq fun (match-string 2 expr)))
(setq mods (ghc-reorder-modules (ghc-function-to-modules fun)))
(if (null mods)
(message "No module guessed")
(let* ((key (or prefix fun))
(fmt (concat "Module name for \"" key "\" (%s): "))
(mod (ghc-completing-read fmt mods)))
(save-excursion
(ghc-goto-module-position)
(if prefix
(insert-before-markers "import qualified " mod " as " prefix "\n")
(insert-before-markers "import " mod " (" (ghc-enclose expr) ")\n")))))))
(defun ghc-completing-read (fmt lst)
(let* ((def (car lst))
(prompt (format fmt def))
(inp (completing-read prompt lst)))
(if (string= inp "") def inp)))
(defun ghc-goto-module-position ()
(goto-char (point-max))
(if (re-search-backward "^import +" nil t)
(ghc-goto-empty-line)
(if (not (re-search-backward "^module" nil t))
(goto-char (point-min))
(ghc-goto-empty-line)
(forward-line)
(unless (eolp)
;; save-excursion is not proper due to insert-before-markers.
(let ((beg (point)))
(insert-before-markers "\n")
(goto-char beg))))))
(defun ghc-goto-empty-line ()
(unless (re-search-forward "^$" nil t)
(forward-line)))
(defun ghc-function-to-modules (fun)
(let ((cmd (format "find %s\n" fun)))
(ghc-sync-process cmd)))
(provide 'ghc-ins-mod)
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