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;;; indent.el --- indentation commands for Emacs
;; Copyright (C) 1985 Free Software Foundation, Inc.
;; Maintainer: FSF
;; This file is part of GNU Emacs.
;; GNU Emacs 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 2, or (at your option)
;; any later version.
;; GNU Emacs 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 GNU Emacs; see the file COPYING. If not, write to
;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
;;; Commentary:
;; Commands for making and changing indentation in text. These are
;; described in the Emacs manual.
;;; Code:
(defvar indent-line-function 'indent-to-left-margin "\
Function to indent current line.")
(defun indent-according-to-mode ()
"Indent line in proper way for current major mode."
(interactive)
(funcall indent-line-function))
(defun indent-for-tab-command ()
"Indent line in proper way for current major mode."
(interactive)
(if (eq indent-line-function 'indent-to-left-margin)
(insert-tab)
(funcall indent-line-function)))
(defun insert-tab ()
(if abbrev-mode
(expand-abbrev))
(if indent-tabs-mode
(insert ?\t)
(indent-to (* tab-width (1+ (/ (current-column) tab-width))))))
(defun indent-rigidly (start end arg)
"Indent all lines starting in the region sideways by ARG columns.
Called from a program, takes three arguments, START, END and ARG."
(interactive "r\np")
(save-excursion
(goto-char end)
(setq end (point-marker))
(goto-char start)
(or (bolp) (forward-line 1))
(while (< (point) end)
(let ((indent (current-indentation)))
(delete-region (point) (progn (skip-chars-forward " \t") (point)))
(or (eolp)
(indent-to (max 0 (+ indent arg)) 0)))
(forward-line 1))
(move-marker end nil)))
;; This is the default indent-line-function,
;; used in Fundamental Mode, Text Mode, etc.
(defun indent-to-left-margin ()
(or (= (current-indentation) left-margin)
(let (epos)
(save-excursion
(beginning-of-line)
(delete-region (point)
(progn (skip-chars-forward " \t")
(point)))
(indent-to left-margin)
(setq epos (point)))
(if (< (point) epos)
(goto-char epos)))))
(defvar indent-region-function nil
"Function which is short cut to indent region using indent-according-to-mode.
A value of nil means really run indent-according-to-mode on each line.")
(defun indent-region (start end column)
"Indent each nonblank line in the region.
With no argument, indent each line using `indent-according-to-mode',
or use `indent-region-function' to do the whole region if that's non-nil.
If there is a fill prefix, make each line start with the fill prefix.
With argument COLUMN, indent each line to that column.
Called from a program, takes three args: START, END and COLUMN."
(interactive "r\nP")
(if (null column)
(if fill-prefix
(save-excursion
(goto-char end)
(setq end (point-marker))
(goto-char start)
(let ((regexp (regexp-quote fill-prefix)))
(while (< (point) end)
(or (looking-at regexp)
(and (bolp) (eolp))
(insert fill-prefix))
(forward-line 1))))
(if indent-region-function
(funcall indent-region-function start end)
(save-excursion
(goto-char end)
(setq end (point-marker))
(goto-char start)
(or (bolp) (forward-line 1))
(while (< (point) end)
(or (and (bolp) (eolp))
(funcall indent-line-function))
(forward-line 1))
(move-marker end nil))))
(setq column (prefix-numeric-value column))
(save-excursion
(goto-char end)
(setq end (point-marker))
(goto-char start)
(or (bolp) (forward-line 1))
(while (< (point) end)
(delete-region (point) (progn (skip-chars-forward " \t") (point)))
(or (eolp)
(indent-to column 0))
(forward-line 1))
(move-marker end nil))))
(defun indent-relative-maybe ()
"Indent a new line like previous nonblank line."
(interactive)
(indent-relative t))
(defun indent-relative (&optional unindented-ok)
"Space out to under next indent point in previous nonblank line.
An indent point is a non-whitespace character following whitespace.
If the previous nonblank line has no indent points beyond the
column point starts at, `tab-to-tab-stop' is done instead."
(interactive "P")
(if abbrev-mode (expand-abbrev))
(let ((start-column (current-column))
indent)
(save-excursion
(beginning-of-line)
(if (re-search-backward "^[^\n]" nil t)
(let ((end (save-excursion (forward-line 1) (point))))
(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]")
unindented-ok
(skip-chars-forward "^ \t" end))
(skip-chars-forward " \t" end)
(or (= (point) end) (setq indent (current-column))))))
(if indent
(let ((opoint (point-marker)))
(delete-region (point) (progn (skip-chars-backward " \t") (point)))
(indent-to indent 0)
(if (> opoint (point))
(goto-char opoint))
(move-marker opoint nil))
(tab-to-tab-stop))))
(defvar tab-stop-list
'(8 16 24 32 40 48 56 64 72 80 88 96 104 112 120)
"*List of tab stop positions used by `tab-to-tab-stops'.")
(defvar edit-tab-stops-map nil "Keymap used in `edit-tab-stops'.")
(if edit-tab-stops-map
nil
(setq edit-tab-stops-map (make-sparse-keymap))
(define-key edit-tab-stops-map "\C-x\C-s" 'edit-tab-stops-note-changes)
(define-key edit-tab-stops-map "\C-c\C-c" 'edit-tab-stops-note-changes))
(defvar edit-tab-stops-buffer nil
"Buffer whose tab stops are being edited--in case
the variable `tab-stop-list' is local in that buffer.")
(defun edit-tab-stops ()
"Edit the tab stops used by `tab-to-tab-stop'.
Creates a buffer *Tab Stops* containing text describing the tab stops.
A colon indicates a column where there is a tab stop.
You can add or remove colons and then do \\<edit-tab-stops-map>\\[edit-tab-stops-note-changes] to make changes take effect."
(interactive)
(setq edit-tab-stops-buffer (current-buffer))
(switch-to-buffer (get-buffer-create "*Tab Stops*"))
(use-local-map edit-tab-stops-map)
(make-local-variable 'indent-tabs-mode)
(setq indent-tabs-mode nil)
(overwrite-mode 1)
(setq truncate-lines t)
(erase-buffer)
(let ((tabs tab-stop-list))
(while tabs
(indent-to (car tabs) 0)
(insert ?:)
(setq tabs (cdr tabs))))
(let ((count 0))
(insert ?\n)
(while (< count 8)
(insert (+ count ?0))
(insert " ")
(setq count (1+ count)))
(insert ?\n)
(while (> count 0)
(insert "0123456789")
(setq count (1- count))))
(insert "\nTo install changes, type C-c C-c")
(goto-char (point-min)))
(defun edit-tab-stops-note-changes ()
"Put edited tab stops into effect."
(interactive)
(let (tabs)
(save-excursion
(goto-char 1)
(end-of-line)
(while (search-backward ":" nil t)
(setq tabs (cons (current-column) tabs))))
(bury-buffer (prog1 (current-buffer)
(switch-to-buffer edit-tab-stops-buffer)))
(setq tab-stop-list tabs))
(message "Tab stops installed"))
(defun tab-to-tab-stop ()
"Insert spaces or tabs to next defined tab-stop column.
The variable `tab-stop-list' is a list of columns at which there are tab stops.
Use \\[edit-tab-stops] to edit them interactively."
(interactive)
(if abbrev-mode (expand-abbrev))
(let ((tabs tab-stop-list))
(while (and tabs (>= (current-column) (car tabs)))
(setq tabs (cdr tabs)))
(if tabs
(indent-to (car tabs))
(insert ?\ ))))
(defun move-to-tab-stop ()
"Move point to next defined tab-stop column.
The variable `tab-stop-list' is a list of columns at which there are tab stops.
Use \\[edit-tab-stops] to edit them interactively."
(interactive)
(let ((tabs tab-stop-list))
(while (and tabs (>= (current-column) (car tabs)))
(setq tabs (cdr tabs)))
(if tabs
(move-to-column (car tabs) t))))
(define-key global-map "\t" 'indent-for-tab-command)
(define-key esc-map "\034" 'indent-region)
(define-key ctl-x-map "\t" 'indent-rigidly)
(define-key esc-map "i" 'tab-to-tab-stop)
;;; indent.el ends here
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