forked from haskell/haskell-mode
-
Notifications
You must be signed in to change notification settings - Fork 0
/
haskell-move-nested.el
130 lines (105 loc) · 4.52 KB
/
haskell-move-nested.el
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
;;; haskell-move-nested.el --- Change the column of text nested below a line -*- lexical-binding: t -*-
;; Copyright (C) 2010 Chris Done
;; Author: Chris Done <[email protected]>
;; This file is not part of GNU Emacs.
;; This program 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 of
;; the License, or (at your option) any later version.
;; This program 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/>.
;;; Commentary:
;; This module is intended for Haskell mode users, but is
;; independent of Haskell mode.
;; Example usage:
;; (define-key haskell-mode-map (kbd "C-,") 'haskell-move-nested-left)
;; (define-key haskell-mode-map (kbd "C-.") 'haskell-move-nested-right)
;;; Code:
;;;###autoload
(defun haskell-move-nested (cols)
"Shift the nested off-side-rule block adjacent to point.
It shift the nested off-side-rule block adjacent to point by COLS
columns to the right.
In Transient Mark mode, if the mark is active, operate on the contents
of the region instead.
"
(save-excursion
(if (and transient-mark-mode mark-active)
(progn
(indent-rigidly (region-beginning) (region-end) cols)
(setq deactivate-mark nil))
(let ((region (haskell-move-nested-region)))
(when region
(indent-rigidly (car region) (cdr region) cols))))))
;;;###autoload
(defun haskell-move-nested-right (cols)
"Increase indentation of the following off-side-rule block adjacent to point.
Use a numeric prefix argument to indicate amount of indentation to apply.
In Transient Mark mode, if the mark is active, operate on the contents
of the region instead."
(interactive "p")
(haskell-move-nested cols))
;;;###autoload
(defun haskell-move-nested-left (cols)
"Decrease indentation of the following off-side-rule block adjacent to point.
Use a numeric prefix argument to indicate amount of indentation to apply.
In Transient Mark mode, if the mark is active, operate on the contents
of the region instead."
(interactive "p")
(haskell-move-nested (- cols)))
(defun haskell-move-nested-region ()
"Infer region off-side-rule block adjacent to point.
Used by `haskell-move-nested'.
"
(save-excursion
(let ((starting-level (current-column)))
(forward-line)
(let ((current-level (haskell-move-nested-indent-level)))
(let ((start-point (line-beginning-position))
(start-end-point (line-end-position))
(end-point nil)
(last-line 0))
(forward-line)
(while (and (not (= (line-beginning-position) last-line))
(or (> (haskell-move-nested-indent-level) starting-level)
(and (> current-level starting-level)
(>= (haskell-move-nested-indent-level) current-level))))
(setq last-line (line-beginning-position))
(setq end-point (line-end-position))
(forward-line))
(cons start-point (or end-point
start-end-point)))))))
(defun haskell-move-nested-indent-level ()
(max
0
(1- (length
(buffer-substring-no-properties
(line-beginning-position)
(or (save-excursion (goto-char (line-beginning-position))
(search-forward-regexp "[^ ]" (line-end-position) t 1))
(line-beginning-position)))))))
(defun haskell-kill-nested ()
"Kill the nested region after point."
(interactive)
(let ((start (point))
(reg (save-excursion
(search-backward-regexp "^[ ]+" (line-beginning-position) t 1)
(search-forward-regexp "[^ ]" (line-end-position) t 1)
(haskell-move-nested-region))))
(kill-region start (cdr reg))))
(defun haskell-delete-nested ()
"Kill the nested region after point."
(interactive)
(let ((start (point))
(reg (save-excursion
(search-backward-regexp "^[ ]+" (line-beginning-position) t 1)
(search-forward-regexp "[^ ]" (line-end-position) t 1)
(haskell-move-nested-region))))
(delete-region start (cdr reg))))
(provide 'haskell-move-nested)
;;; haskell-move-nested.el ends here