Non puoi selezionare più di 25 argomenti
Gli argomenti devono iniziare con una lettera o un numero, possono includere trattini ('-') e possono essere lunghi fino a 35 caratteri.
114 righe
4.0 KiB
114 righe
4.0 KiB
;;; haskell-collapse.el --- Collapse expressions -*- lexical-binding: t -*-
|
|
|
|
;; Copyright (c) 2014 Chris Done. All rights reserved.
|
|
;; Copyright (c) 2017 Vasantha Ganesh Kanniappan <vasanthaganesh.k@tuta.io>.
|
|
|
|
;; This file is free software; you can redistribute it and/or modify
|
|
;; it under the terms of the GNU General Public License as published by
|
|
;; the Free Software Foundation; either version 3, or (at your option)
|
|
;; any later version.
|
|
|
|
;; This file is distributed in the hope that it will be useful,
|
|
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
;; GNU General Public License for more details.
|
|
|
|
;; You should have received a copy of the GNU General Public License
|
|
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
;;; Code:
|
|
|
|
(require 'hideshow)
|
|
|
|
;;; TODO:
|
|
;;; -> Make it work for braces
|
|
|
|
(defun haskell-hide-toggle ()
|
|
"Toggle visibility of existing forms at point. "
|
|
(interactive)
|
|
(hs-minor-mode 1)
|
|
(save-excursion
|
|
(let* ((modified (buffer-modified-p))
|
|
(inhibit-read-only t)
|
|
(position (haskell-indented-block))
|
|
(beg (car position))
|
|
(end (cdr position)))
|
|
(if (and beg end)
|
|
(if (overlays-in beg end)
|
|
(hs-discard-overlays beg end)
|
|
(hs-make-overlay beg end 'code)))
|
|
(set-buffer-modified-p modified))))
|
|
|
|
(defun haskell-blank-line-p ()
|
|
"Returns `t' if line is empty or composed only of whitespace."
|
|
(save-excursion
|
|
(beginning-of-line)
|
|
(= (point-at-eol)
|
|
(progn (skip-chars-forward "[:blank:]") (point)))))
|
|
|
|
(defun haskell-indented-block ()
|
|
"return (start-of-indentation . end-of-indentation)"
|
|
(let ((cur-indent (current-indentation))
|
|
(nxt-line-indent (haskell-next-line-indentation 1))
|
|
(prev-line-indent (haskell-next-line-indentation -1))
|
|
(beg-of-line (save-excursion (end-of-line)
|
|
(point))))
|
|
(cond ((and (= cur-indent 0)
|
|
(= nxt-line-indent 0)) nil)
|
|
((haskell-blank-line-p) nil)
|
|
((> nxt-line-indent cur-indent)
|
|
(cons beg-of-line
|
|
(haskell-find-line-with-indentation '> 1)))
|
|
((or (= nxt-line-indent cur-indent)
|
|
(<= prev-line-indent cur-indent))
|
|
(cons (haskell-find-line-with-indentation '>= -1)
|
|
(haskell-find-line-with-indentation '>= 1)))
|
|
(t nil))))
|
|
|
|
(defun haskell-next-line-indentation (dir)
|
|
"returns (integer) indentation of the next if dir=1, previous line
|
|
indentation if dir=-1"
|
|
(save-excursion
|
|
(progn
|
|
(while (and (zerop (forward-line dir))
|
|
(haskell-blank-line-p)))
|
|
(current-indentation))))
|
|
|
|
(defun haskell-find-line-with-indentation (comparison direction)
|
|
"comparison is >= or >, direction if 1 finds forward, if -1 finds backward"
|
|
(save-excursion
|
|
(let ((start-indent (current-indentation)))
|
|
(progn
|
|
(while (and (zerop (forward-line direction))
|
|
(or (haskell-blank-line-p)
|
|
(funcall comparison (current-indentation) start-indent))))
|
|
(when (= direction 1) (forward-line -1))
|
|
(end-of-line)
|
|
(point)))))
|
|
|
|
(defun haskell-hide-toggle-all ()
|
|
"hides all top level functions"
|
|
(interactive)
|
|
(save-excursion
|
|
(goto-char (point-max))
|
|
(while (zerop (forward-line -1))
|
|
(goto-char (point-at-bol))
|
|
(when (= (current-indentation) 0) (haskell-hide-toggle)))))
|
|
|
|
(defvar haskell-collapse-mode-map
|
|
(let ((map (make-sparse-keymap)))
|
|
(define-key map (kbd "C-c @ C-c") 'haskell-hide-toggle)
|
|
(define-key map (kbd "C-c @ C-M-c") 'haskell-hide-toggle-all)
|
|
(define-key map (kbd "C-c @ C-M-s") 'haskell-hide-toggle-all)
|
|
(define-key map (kbd "C-c @ C-M-h") 'haskell-hide-toggle-all)
|
|
map)
|
|
"Keymap for using `haskell-collapse-mode'.")
|
|
|
|
;;;###autoload
|
|
(define-minor-mode haskell-collapse-mode
|
|
"Minor mode to collapse and expand haskell expressions"
|
|
:init-value nil
|
|
:lighter " Haskell-Collapse"
|
|
:keymap haskell-collapse-mode-map)
|
|
|
|
(provide 'haskell-collapse)
|