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;; haskell-move-nested.el — Change the column of text nested below a line.
;; Copyright (C) 2010 Chris Done <chrisdone@gmail.com>
;; This module is intended for Haskell mode users, but is
;; independent of Haskell mode.
;; Example usage:
;; (require 'haskell-move-nested)
;; (define-key haskell-mode-map (kbd "C-<left>")
;; (lambda ()
;; (interactive)
;; (haskell-move-nested -1)))
;; (define-key haskell-mode-map (kbd "C-<right>")
;; (lambda ()
;; (interactive)
;; (haskell-move-nested 1)))
;; 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/>.
;;;###autoload
(defun haskell-move-nested (columns)
(save-excursion
(let ((region (haskell-move-nested-region)))
(when region
(indent-rigidly (car region) (cdr region) columns)))))
(defun haskell-move-nested-region ()
(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 this."
(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 this."
(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)
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