ghc-mod/elisp/ghc-info.el

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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; ghc-info.el
;;;
;; Author: Kazu Yamamoto <Kazu@Mew.org>
;; Created: Nov 15, 2010
;;; Code:
(require 'ghc-func)
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(require 'ghc-process)
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(defun ghc-show-info (&optional ask)
(interactive "P")
(let* ((expr0 (ghc-things-at-point))
(expr (if (or ask (not expr0)) (ghc-read-expression expr0) expr0))
(info (ghc-get-info expr)))
(when info
(ghc-display
nil
(lambda () (insert info))))))
(defun ghc-get-info (expr)
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(let* ((file (buffer-file-name))
(cmd (format "info %s %s\n" file expr)))
(car (ghc-sync-process (lambda () cmd)))))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
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;;; type
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;;;
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(defvar ghc-type-overlay nil)
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(make-variable-buffer-local 'ghc-type-overlay)
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(defun ghc-type-set-ix (n)
(overlay-put ghc-type-overlay 'ix n))
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(defun ghc-type-get-ix ()
(overlay-get ghc-type-overlay 'ix))
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(defun ghc-type-set-point (pos)
(overlay-put ghc-type-overlay 'pos pos))
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(defun ghc-type-get-point ()
(overlay-get ghc-type-overlay 'pos))
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(defun ghc-type-set-types (types)
(overlay-put ghc-type-overlay 'types types))
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(defun ghc-type-get-types ()
(overlay-get ghc-type-overlay 'types))
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(ghc-defstruct tinfo beg-line beg-column end-line end-column info)
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(defun ghc-type-init ()
(setq ghc-type-overlay (make-overlay 0 0))
(overlay-put ghc-type-overlay 'face 'region)
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(ghc-type-clear-overlay)
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(setq after-change-functions
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(cons 'ghc-type-clear-overlay after-change-functions))
(add-hook 'post-command-hook 'ghc-type-post-command-hook))
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(defun ghc-type-clear-overlay (&optional beg end len)
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(when (overlayp ghc-type-overlay)
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(ghc-type-set-ix 0)
(ghc-type-set-point 0)
(move-overlay ghc-type-overlay 0 0)))
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(defun ghc-type-post-command-hook ()
(when (and (eq major-mode 'haskell-mode)
(overlayp ghc-type-overlay)
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(/= (ghc-type-get-point) (point)))
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(ghc-type-clear-overlay)))
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(defun ghc-show-type ()
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(interactive)
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(let ((buf (current-buffer))
(tinfos (ghc-type-get-tinfos)))
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(if (null tinfos)
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(progn
(ghc-type-clear-overlay)
(message "Cannot guess type"))
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(let* ((tinfo (nth (ghc-type-get-ix) tinfos))
(type (ghc-tinfo-get-info tinfo))
(beg-line (ghc-tinfo-get-beg-line tinfo))
(beg-column (ghc-tinfo-get-beg-column tinfo))
(end-line (ghc-tinfo-get-end-line tinfo))
(end-column (ghc-tinfo-get-end-column tinfo))
(left (ghc-get-pos buf beg-line beg-column))
(right (ghc-get-pos buf end-line end-column)))
(move-overlay ghc-type-overlay (- left 1) (- right 1) buf)
(message type)))))
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(defun ghc-type-get-tinfos ()
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(if (= (ghc-type-get-point) (point))
(ghc-type-set-ix
(mod (1+ (ghc-type-get-ix)) (length (ghc-type-get-types))))
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(let ((types (ghc-type-obtain-tinfos)))
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(if (not (listp types)) ;; main does not exist in Main
(ghc-type-set-types nil)
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(ghc-type-set-types types)
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(ghc-type-set-point (point))
(ghc-type-set-ix 0))))
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(ghc-type-get-types))
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(defun ghc-type-obtain-tinfos ()
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(let* ((ln (int-to-string (line-number-at-pos)))
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(cn (int-to-string (1+ (current-column))))
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(file (buffer-file-name))
(cmd (format "type %s %s %s\n" file ln cn)))
(ghc-sync-process (lambda () cmd))))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; Expanding Template Haskell
;;;
(defun ghc-expand-th ()
(interactive)
(let* ((file (buffer-file-name))
(cmds (list "expand" file))
(source (ghc-run-ghc-mod cmds)))
(when source
(ghc-display
'fontify
(lambda () (insert source))))))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; Misc
;;;
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(defun ghc-get-pos (buf line col)
(save-excursion
(set-buffer buf)
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(goto-char (point-min))
(forward-line (1- line))
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(forward-char col)
(point)))
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(defun ghc-read-expression (default)
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(if default
(let ((prompt (format "Expression (%s): " default)))
(read-string prompt default nil))
(read-string "Expression: ")))
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(defun ghc-find-module-name ()
(save-excursion
(goto-char (point-min))
(if (re-search-forward "^module[ ]+\\([^ \n]+\\)" nil t)
(match-string-no-properties 1))))
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(provide 'ghc-info)