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author Shohei KOKUBO <e105744@ie.u-ryukyu.ac.jp>
date Mon, 21 Apr 2014 04:30:59 +0900
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Shohei KOKUBO <e105744@ie.u-ryukyu.ac.jp>
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1 ;;; haskell-move-nested.el --- Change the column of text nested below a line
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2
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3 ;; Copyright (C) 2010 Chris Done
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4
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5 ;; Author: Chris Done <chrisdone@gmail.com>
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6
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7 ;; This file is not part of GNU Emacs.
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8
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9 ;; This program is free software: you can redistribute it and/or
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10 ;; modify it under the terms of the GNU General Public License as
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11 ;; published by the Free Software Foundation, either version 3 of
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12 ;; the License, or (at your option) any later version.
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13
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14 ;; This program is distributed in the hope that it will be
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15 ;; useful, but WITHOUT ANY WARRANTY; without even the implied
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16 ;; warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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17 ;; PURPOSE. See the GNU General Public License for more details.
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18
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19 ;; You should have received a copy of the GNU General Public
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20 ;; License along with this program. If not, see
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21 ;; <http://www.gnu.org/licenses/>.
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22
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23 ;;; Commentary:
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24
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25 ;; This module is intended for Haskell mode users, but is
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26 ;; independent of Haskell mode.
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27
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28 ;; Example usage:
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29
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30 ;; (define-key haskell-mode-map (kbd "C-,") 'haskell-move-nested-left)
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31 ;; (define-key haskell-mode-map (kbd "C-.") 'haskell-move-nested-right)
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32
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33 ;;; Code:
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34
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35 ;;;###autoload
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36 (defun haskell-move-nested (cols)
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37 "Shift the nested off-side-rule block adjacent to point by COLS columns to the right.
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38
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39 In Transient Mark mode, if the mark is active, operate on the contents
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40 of the region instead.
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41 "
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42 (save-excursion
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43 (if (and transient-mark-mode mark-active)
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44 (progn
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45 (indent-rigidly (region-beginning) (region-end) cols)
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46 (setq deactivate-mark nil))
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47 (let ((region (haskell-move-nested-region)))
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48 (when region
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49 (indent-rigidly (car region) (cdr region) cols))))))
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50
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51 ;;;###autoload
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52 (defun haskell-move-nested-right (cols)
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53 "Increase indentation of the following off-side-rule block adjacent to point.
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54
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55 Use a numeric prefix argument to indicate amount of indentation to apply.
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56
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57 In Transient Mark mode, if the mark is active, operate on the contents
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58 of the region instead."
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59 (interactive "p")
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60 (haskell-move-nested cols)
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61 )
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62
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63 ;;;###autoload
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64 (defun haskell-move-nested-left (cols)
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65 "Decrease indentation of the following off-side-rule block adjacent to point.
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66
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67 Use a numeric prefix argument to indicate amount of indentation to apply.
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68
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69 In Transient Mark mode, if the mark is active, operate on the contents
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70 of the region instead."
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71 (interactive "p")
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72 (haskell-move-nested (- cols))
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73 )
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74
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75 (defun haskell-move-nested-region ()
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76 "Infer region off-side-rule block adjacent to point.
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77 Used by `haskell-move-nested'.
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78 "
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79 (save-excursion
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80 (let ((starting-level (current-column)))
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81 (forward-line)
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82 (let ((current-level (haskell-move-nested-indent-level)))
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83 (let ((start-point (line-beginning-position))
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84 (start-end-point (line-end-position))
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85 (end-point nil)
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86 (last-line 0))
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87 (forward-line)
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88 (while (and (not (= (line-beginning-position) last-line))
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89 (or (> (haskell-move-nested-indent-level) starting-level)
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90 (and (> current-level starting-level)
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91 (>= (haskell-move-nested-indent-level) current-level))))
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92 (setq last-line (line-beginning-position))
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93 (setq end-point (line-end-position))
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94 (forward-line))
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95 (cons start-point (or end-point
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96 start-end-point)))))))
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97
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98 (defun haskell-move-nested-indent-level ()
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99 (max
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100 0
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101 (1- (length
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102 (buffer-substring-no-properties
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103 (line-beginning-position)
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104 (or (save-excursion (goto-char (line-beginning-position))
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105 (search-forward-regexp "[^ ]" (line-end-position) t 1))
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106 (line-beginning-position)))))))
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107
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108 (defun haskell-kill-nested ()
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109 "Kill the nested region after point."
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110 (interactive)
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111 (let ((start (point))
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112 (reg (save-excursion
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113 (search-backward-regexp "^[ ]+" (line-beginning-position) t 1)
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114 (search-forward-regexp "[^ ]" (line-end-position) t 1)
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115 (haskell-move-nested-region))))
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116 (kill-region start (cdr reg))))
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117
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118 (defun haskell-delete-nested ()
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119 "Kill the nested region after point."
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120 (interactive)
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121 (let ((start (point))
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122 (reg (save-excursion
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123 (search-backward-regexp "^[ ]+" (line-beginning-position) t 1)
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124 (search-forward-regexp "[^ ]" (line-end-position) t 1)
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125 (haskell-move-nested-region))))
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126 (delete-region start (cdr reg))))
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127
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128 (provide 'haskell-move-nested)
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129
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130 ;;; haskell-move-nested.el ends here