mirror of
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252 lines
8.1 KiB
EmacsLisp
252 lines
8.1 KiB
EmacsLisp
;;; indent.el --- indentation commands for Emacs
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;; Copyright (C) 1985 Free Software Foundation, Inc.
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;; Maintainer: FSF
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to
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;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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;;; Code:
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(defvar indent-line-function 'indent-to-left-margin "\
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Function to indent current line.");Now in loaddefs.el
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(defun indent-according-to-mode ()
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"Indent line in proper way for current major mode."
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(interactive)
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(funcall indent-line-function))
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(defun indent-for-tab-command ()
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"Indent line in proper way for current major mode."
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(interactive)
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(if (eq indent-line-function 'indent-to-left-margin)
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(insert-tab)
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(funcall indent-line-function)))
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(defun insert-tab ()
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(if abbrev-mode
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(expand-abbrev))
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(if indent-tabs-mode
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(insert ?\t)
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(indent-to (* tab-width (1+ (/ (current-column) tab-width))))))
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(defun indent-rigidly (start end arg)
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"Indent all lines starting in the region sideways by ARG columns.
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Called from a program, takes three arguments, START, END and ARG."
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(interactive "r\np")
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(save-excursion
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(goto-char end)
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(setq end (point-marker))
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(goto-char start)
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(or (bolp) (forward-line 1))
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(while (< (point) end)
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(let ((indent (current-indentation)))
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(delete-region (point) (progn (skip-chars-forward " \t") (point)))
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(or (eolp)
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(indent-to (max 0 (+ indent arg)) 0)))
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(forward-line 1))
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(move-marker end nil)))
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;; This is the default indent-line-function,
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;; used in Fundamental Mode, Text Mode, etc.
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(defun indent-to-left-margin ()
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(or (= (current-indentation) left-margin)
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(let (epos)
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(save-excursion
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(beginning-of-line)
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(delete-region (point)
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(progn (skip-chars-forward " \t")
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(point)))
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(indent-to left-margin)
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(setq epos (point)))
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(if (< (point) epos)
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(goto-char epos)))))
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(defvar indent-region-function nil
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"Function which is short cut to indent each line in region with TAB.
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A value of nil means really perform TAB on each line.")
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(defun indent-region (start end arg)
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"Indent each nonblank line in the region.
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With no argument, indent each line with TAB.
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\(If there is a fill prefix, make each line start with the fill prefix.)
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With argument COLUMN, indent each line to that column.
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Called from a program, takes three args: START, END and COLUMN."
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(interactive "r\nP")
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(if (null arg)
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(if fill-prefix
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(save-excursion
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(goto-char end)
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(setq end (point-marker))
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(goto-char start)
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(let ((regexp (regexp-quote fill-prefix)))
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(while (< (point) end)
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(or (looking-at regexp)
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(insert fill-prefix))
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(forward-line 1))))
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(if indent-region-function
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(funcall indent-region-function start end)
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(save-excursion
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(goto-char end)
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(setq end (point-marker))
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(goto-char start)
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(or (bolp) (forward-line 1))
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(while (< (point) end)
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(funcall indent-line-function)
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(forward-line 1))
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(move-marker end nil))))
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(setq arg (prefix-numeric-value arg))
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(save-excursion
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(goto-char end)
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(setq end (point-marker))
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(goto-char start)
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(or (bolp) (forward-line 1))
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(while (< (point) end)
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(delete-region (point) (progn (skip-chars-forward " \t") (point)))
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(or (eolp)
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(indent-to arg 0))
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(forward-line 1))
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(move-marker end nil))))
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(defun indent-relative-maybe ()
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"Indent a new line like previous nonblank line."
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(interactive)
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(indent-relative t))
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(defun indent-relative (&optional unindented-ok)
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"Space out to under next indent point in previous nonblank line.
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An indent point is a non-whitespace character following whitespace.
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If the previous nonblank line has no indent points beyond the
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column point starts at, `tab-to-tab-stop' is done instead."
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(interactive "P")
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(if abbrev-mode (expand-abbrev))
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(let ((start-column (current-column))
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indent)
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(save-excursion
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(beginning-of-line)
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(if (re-search-backward "^[^\n]" nil t)
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(let ((end (save-excursion (forward-line 1) (point))))
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(move-to-column start-column)
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;; Is start-column inside a tab on this line?
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(if (> (current-column) start-column)
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(backward-char 1))
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(or (looking-at "[ \t]")
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unindented-ok
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(skip-chars-forward "^ \t" end))
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(skip-chars-forward " \t" end)
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(or (= (point) end) (setq indent (current-column))))))
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(if indent
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(let ((opoint (point-marker)))
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(delete-region (point) (progn (skip-chars-backward " \t") (point)))
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(indent-to indent 0)
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(if (> opoint (point))
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(goto-char opoint))
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(move-marker opoint nil))
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(tab-to-tab-stop))))
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(defvar tab-stop-list
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'(8 16 24 32 40 48 56 64 72 80 88 96 104 112 120)
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"*List of tab stop positions used by `tab-to-tab-stops'.")
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(defvar edit-tab-stops-map nil "Keymap used in `edit-tab-stops'.")
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(if edit-tab-stops-map
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nil
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(setq edit-tab-stops-map (make-sparse-keymap))
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(define-key edit-tab-stops-map "\C-x\C-s" 'edit-tab-stops-note-changes)
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(define-key edit-tab-stops-map "\C-c\C-c" 'edit-tab-stops-note-changes))
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(defvar edit-tab-stops-buffer nil
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"Buffer whose tab stops are being edited--in case
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the variable `tab-stop-list' is local in that buffer.")
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(defun edit-tab-stops ()
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"Edit the tab stops used by `tab-to-tab-stop'.
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Creates a buffer *Tab Stops* containing text describing the tab stops.
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A colon indicates a column where there is a tab stop.
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You can add or remove colons and then do \\<edit-tab-stops-map>\\[edit-tab-stops-note-changes] to make changes take effect."
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(interactive)
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(setq edit-tab-stops-buffer (current-buffer))
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(switch-to-buffer (get-buffer-create "*Tab Stops*"))
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(use-local-map edit-tab-stops-map)
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(make-local-variable 'indent-tabs-mode)
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(setq indent-tabs-mode nil)
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(overwrite-mode 1)
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(setq truncate-lines t)
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(erase-buffer)
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(let ((tabs tab-stop-list))
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(while tabs
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(indent-to (car tabs) 0)
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(insert ?:)
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(setq tabs (cdr tabs))))
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(let ((count 0))
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(insert ?\n)
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(while (< count 8)
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(insert (+ count ?0))
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(insert " ")
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(setq count (1+ count)))
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(insert ?\n)
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(while (> count 0)
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(insert "0123456789")
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(setq count (1- count))))
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(insert "\nTo install changes, type C-c C-c")
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(goto-char (point-min)))
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(defun edit-tab-stops-note-changes ()
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"Put edited tab stops into effect."
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(interactive)
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(let (tabs)
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(save-excursion
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(goto-char 1)
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(end-of-line)
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(while (search-backward ":" nil t)
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(setq tabs (cons (current-column) tabs))))
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(bury-buffer (prog1 (current-buffer)
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(switch-to-buffer edit-tab-stops-buffer)))
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(setq tab-stop-list tabs))
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(message "Tab stops installed"))
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(defun tab-to-tab-stop ()
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"Insert spaces or tabs to next defined tab-stop column.
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The variable `tab-stop-list' is a list of columns at which there are tab stops.
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Use \\[edit-tab-stops] to edit them interactively."
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(interactive)
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(if abbrev-mode (expand-abbrev))
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(let ((tabs tab-stop-list))
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(while (and tabs (>= (current-column) (car tabs)))
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(setq tabs (cdr tabs)))
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(if tabs
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(indent-to (car tabs))
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(insert ?\ ))))
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(defun move-to-tab-stop ()
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"Move point to next defined tab-stop column.
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The variable `tab-stop-list' is a list of columns at which there are tab stops.
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Use \\[edit-tab-stops] to edit them interactively."
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(interactive)
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(let ((tabs tab-stop-list))
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(while (and tabs (>= (current-column) (car tabs)))
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(setq tabs (cdr tabs)))
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(if tabs
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(move-to-column (car tabs) t))))
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(define-key global-map "\t" 'indent-for-tab-command)
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(define-key esc-map "\034" 'indent-region)
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(define-key ctl-x-map "\t" 'indent-rigidly)
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(define-key esc-map "i" 'tab-to-tab-stop)
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;;; indent.el ends here
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