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