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130 lines
4.5 KiB
130 lines
4.5 KiB
;;; haskell-move-nested.el --- Change the column of text nested below a line -*- lexical-binding: t -*-
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;; Copyright (C) 2010 Chris Done
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;; Author: Chris Done <chrisdone@gmail.com>
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;; This file is not part of GNU Emacs.
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;; This program is free software: you can redistribute it and/or
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;; modify it under the terms of the GNU General Public License as
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;; published by the Free Software Foundation, either version 3 of
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;; the License, or (at your option) any later version.
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;; This program is distributed in the hope that it will be
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;; useful, but WITHOUT ANY WARRANTY; without even the implied
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;; warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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;; PURPOSE. See the GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public
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;; License along with this program. If not, see
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;; <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; This module is intended for Haskell mode users, but is
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;; independent of Haskell mode.
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;; Example usage:
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;; (define-key haskell-mode-map (kbd "C-,") 'haskell-move-nested-left)
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;; (define-key haskell-mode-map (kbd "C-.") 'haskell-move-nested-right)
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;;; Code:
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;;;###autoload
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(defun haskell-move-nested (cols)
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"Shift the nested off-side-rule block adjacent to point by COLS columns to the right.
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In Transient Mark mode, if the mark is active, operate on the contents
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of the region instead.
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"
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(save-excursion
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(if (and transient-mark-mode mark-active)
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(progn
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(indent-rigidly (region-beginning) (region-end) cols)
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(setq deactivate-mark nil))
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(let ((region (haskell-move-nested-region)))
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(when region
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(indent-rigidly (car region) (cdr region) cols))))))
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;;;###autoload
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(defun haskell-move-nested-right (cols)
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"Increase indentation of the following off-side-rule block adjacent to point.
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Use a numeric prefix argument to indicate amount of indentation to apply.
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In Transient Mark mode, if the mark is active, operate on the contents
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of the region instead."
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(interactive "p")
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(haskell-move-nested cols)
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)
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;;;###autoload
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(defun haskell-move-nested-left (cols)
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"Decrease indentation of the following off-side-rule block adjacent to point.
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Use a numeric prefix argument to indicate amount of indentation to apply.
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In Transient Mark mode, if the mark is active, operate on the contents
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of the region instead."
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(interactive "p")
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(haskell-move-nested (- cols))
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)
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(defun haskell-move-nested-region ()
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"Infer region off-side-rule block adjacent to point.
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Used by `haskell-move-nested'.
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"
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(save-excursion
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(let ((starting-level (current-column)))
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(forward-line)
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(let ((current-level (haskell-move-nested-indent-level)))
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(let ((start-point (line-beginning-position))
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(start-end-point (line-end-position))
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(end-point nil)
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(last-line 0))
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(forward-line)
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(while (and (not (= (line-beginning-position) last-line))
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(or (> (haskell-move-nested-indent-level) starting-level)
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(and (> current-level starting-level)
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(>= (haskell-move-nested-indent-level) current-level))))
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(setq last-line (line-beginning-position))
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(setq end-point (line-end-position))
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(forward-line))
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(cons start-point (or end-point
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start-end-point)))))))
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(defun haskell-move-nested-indent-level ()
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(max
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0
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(1- (length
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(buffer-substring-no-properties
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(line-beginning-position)
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(or (save-excursion (goto-char (line-beginning-position))
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(search-forward-regexp "[^ ]" (line-end-position) t 1))
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(line-beginning-position)))))))
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(defun haskell-kill-nested ()
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"Kill the nested region after point."
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(interactive)
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(let ((start (point))
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(reg (save-excursion
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(search-backward-regexp "^[ ]+" (line-beginning-position) t 1)
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(search-forward-regexp "[^ ]" (line-end-position) t 1)
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(haskell-move-nested-region))))
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(kill-region start (cdr reg))))
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(defun haskell-delete-nested ()
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"Kill the nested region after point."
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(interactive)
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(let ((start (point))
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(reg (save-excursion
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(search-backward-regexp "^[ ]+" (line-beginning-position) t 1)
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(search-forward-regexp "[^ ]" (line-end-position) t 1)
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(haskell-move-nested-region))))
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(delete-region start (cdr reg))))
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(provide 'haskell-move-nested)
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;;; haskell-move-nested.el ends here
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