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;;; hs-simple-indent.el -- Simple indentation module for Haskell Mode
;; Copyright (C) 1998 Heribert Schuetz, Graeme E Moss
;; Authors:
;; 1998 Heribert Schuetz <> and
;; Graeme E Moss <>
;; Keywords: indentation files Haskell
;; Version: 1.0
;; URL:
;; This file is not part of GNU Emacs.
;; 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
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Code:
;; (defun hs-simple-indent ()
;; (interactive)
;; (unless (= (point) (line-end-position))
;; (let ((relative-col (current-column))
;; (start-col (hs-move-nested-indent-level)))
;; (goto-char (+ (line-beginning-position) start-col))
;; (hs-simple-indent-line)
;; (let* ((col (hs-move-nested-indent-level))
;; (cols-moved (- col start-col)))
;; (hs-move-nested cols-moved)
;; (goto-char (+ (line-beginning-position)
;; relative-col
;; cols-moved))))))
(defun hs-simple-indent-line ()
"Space out to under next visible indent point.
Indent points are positions of non-whitespace following whitespace in
lines preceeding point. A position is visible if it is to the left of
the first non-whitespace of every nonblank line between the position and
the current line. If there is no visible indent point beyond the current
column, `tab-to-tab-stop' is done instead."
(let* ((start-column (current-column))
(invisible-from nil) ; `nil' means infinity here
(catch 'haskell-simple-indent-break
(while (progn (beginning-of-line)
(not (bobp)))
(forward-line -1)
(if (not (looking-at "[ \t]*\n"))
(let ((this-indentation (current-indentation)))
(if (or (not invisible-from)
(< this-indentation invisible-from))
(if (> this-indentation start-column)
(setq invisible-from this-indentation)
(let ((end (line-beginning-position 2)))
(move-to-column start-column)
;; Is start-column inside a tab on this line?
(if (> (current-column) start-column)
(backward-char 1))
(or (looking-at "[ \t]")
(skip-chars-forward "^ \t" end))
(skip-chars-forward " \t" end)
(let ((col (current-column)))
(throw 'haskell-simple-indent-break
(if (or (= (point) end)
(and invisible-from
(> col invisible-from)))
(if indent
(let ((opoint (point-marker)))
(indent-line-to indent)
(if (> opoint (point))
(goto-char opoint))
(set-marker opoint nil))