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538 lines
20 KiB
EmacsLisp
538 lines
20 KiB
EmacsLisp
;;; indent.el --- indentation commands for Emacs
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;; Copyright (C) 1985, 1995, 2001 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 the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; Commands for making and changing indentation in text. These are
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;; described in the Emacs manual.
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;;; Code:
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(defgroup indent nil
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"Indentation commands"
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:group 'editing)
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(defcustom standard-indent 4
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"*Default number of columns for margin-changing functions to indent."
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:group 'indent
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:type 'integer)
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(defvar indent-line-function 'indent-relative
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"Function to indent the current line.
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This function will be called with no arguments.
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If it is called somewhere where auto-indentation cannot be done
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\(f.ex. inside a string), the function should simply return `noindent'.
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Setting this function is all you need to make TAB indent appropriately.
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Don't rebind TAB unless you really need to.")
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(defcustom tab-always-indent t
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"*Controls the operation of the TAB key.
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If t, hitting TAB always just indents the current line.
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If nil, hitting TAB indents the current line if point is at the left margin
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or in the line's indentation, otherwise it insert a `real' tab character."
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:group 'indent
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:type '(choice (const nil) (const t) (const always)))
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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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The buffer-local variable `indent-line-function' determines how to do this,
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but the functions `indent-relative' and `indent-relative-maybe' are
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special; we don't actually use them here."
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(interactive)
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(if (memq indent-line-function
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'(indent-relative indent-relative-maybe))
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;; These functions are used for tabbing, but can't be used for
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;; indenting. Replace with something ad-hoc.
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(let ((column (save-excursion
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(beginning-of-line)
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(skip-chars-backward "\n \t")
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(beginning-of-line)
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(current-indentation))))
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(if (<= (current-column) (current-indentation))
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(indent-line-to column)
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(save-excursion (indent-line-to column))))
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;; The normal case.
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(funcall indent-line-function)))
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(defun indent-for-tab-command (&optional arg)
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"Indent line in proper way for current major mode or insert a tab.
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Depending on `tab-always-indent', either insert a tab or indent.
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If initial point was within line's indentation, position after
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the indentation. Else stay at same point in text.
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The function actually called to indent is determined by the value of
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`indent-line-function'."
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(interactive "P")
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(cond
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((or ;; indent-to-left-margin is only meant for indenting,
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;; so we force it to always insert a tab here.
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(eq indent-line-function 'indent-to-left-margin)
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(and (not tab-always-indent)
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(> (current-column) (current-indentation))))
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(insert-tab arg))
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;; Those functions are meant specifically for tabbing and not for
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;; indenting, so we can't pass them to indent-according-to-mode.
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((memq indent-line-function '(indent-relative indent-relative-maybe))
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(funcall indent-line-function))
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(t ;; The normal case.
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(indent-according-to-mode))))
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(defun insert-tab (&optional arg)
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(let ((count (prefix-numeric-value arg)))
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(if (and abbrev-mode
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(eq (char-syntax (preceding-char)) ?w))
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(expand-abbrev))
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(if indent-tabs-mode
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(insert-char ?\t count)
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(indent-to (* tab-width (+ count (/ (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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You can remove all indentation from a region by giving a large negative 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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eol-flag)
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(save-excursion
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(skip-chars-forward " \t")
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(setq eol-flag (eolp)))
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(or eol-flag
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(indent-to (max 0 (+ indent arg)) 0))
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(delete-region (point) (progn (skip-chars-forward " \t") (point))))
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(forward-line 1))
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(move-marker end nil)))
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(defun indent-line-to (column)
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"Indent current line to COLUMN.
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This function removes or adds spaces and tabs at beginning of line
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only if necessary. It leaves point at end of indentation."
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(back-to-indentation)
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(let ((cur-col (current-column)))
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(cond ((< cur-col column)
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(if (>= (- column (* (/ cur-col tab-width) tab-width)) tab-width)
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(delete-region (point)
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(progn (skip-chars-backward " ") (point))))
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(indent-to column))
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((> cur-col column) ; too far right (after tab?)
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(delete-region (progn (move-to-column column t) (point))
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(progn (back-to-indentation) (point)))))))
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(defun current-left-margin ()
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"Return the left margin to use for this line.
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This is the value of the buffer-local variable `left-margin' plus the value
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of the `left-margin' text-property at the start of the line."
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(save-excursion
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(back-to-indentation)
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(max 0
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(+ left-margin (or (get-text-property
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(if (and (eobp) (not (bobp)))
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(1- (point)) (point))
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'left-margin) 0)))))
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(defun move-to-left-margin (&optional n force)
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"Move to the left margin of the current line.
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With optional argument, move forward N-1 lines first.
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The column moved to is the one given by the `current-left-margin' function.
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If the line's indentation appears to be wrong, and this command is called
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interactively or with optional argument FORCE, it will be fixed."
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(interactive (list (prefix-numeric-value current-prefix-arg) t))
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(beginning-of-line n)
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(skip-chars-forward " \t")
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(let ((lm (current-left-margin))
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(cc (current-column)))
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(cond ((> cc lm)
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(if (> (move-to-column lm force) lm)
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;; If lm is in a tab and we are not forcing, move before tab
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(backward-char 1)))
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((and force (< cc lm))
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(indent-to-left-margin)))))
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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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"Indent current line to the column given by `current-left-margin'."
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(indent-line-to (current-left-margin)))
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(defun delete-to-left-margin (&optional from to)
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"Remove left margin indentation from a region.
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This deletes to the column given by `current-left-margin'.
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In no case will it delete non-whitespace.
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Args FROM and TO are optional; default is the whole buffer."
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(save-excursion
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(goto-char (or to (point-max)))
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(setq to (point-marker))
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(goto-char (or from (point-min)))
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(or (bolp) (forward-line 1))
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(while (< (point) to)
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(delete-region (point) (progn (move-to-left-margin nil t) (point)))
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(forward-line 1))
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(move-marker to nil)))
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(defun set-left-margin (from to lm)
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"Set the left margin of the region to WIDTH.
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If `auto-fill-mode' is active, re-fill the region to fit the new margin."
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(interactive "r\nNSet left margin to column: ")
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(if (interactive-p) (setq lm (prefix-numeric-value lm)))
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(save-excursion
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;; If inside indentation, start from BOL.
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(goto-char from)
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(skip-chars-backward " \t")
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(if (bolp) (setq from (point)))
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;; Place end after whitespace
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(goto-char to)
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(skip-chars-forward " \t")
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(setq to (point-marker)))
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;; Delete margin indentation first, but keep paragraph indentation.
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(delete-to-left-margin from to)
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(put-text-property from to 'left-margin lm)
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(indent-rigidly from to lm)
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(if auto-fill-function (save-excursion (fill-region from to nil t t)))
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(move-marker to nil))
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(defun set-right-margin (from to lm)
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"Set the right margin of the region to WIDTH.
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If `auto-fill-mode' is active, re-fill the region to fit the new margin."
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(interactive "r\nNSet right margin to width: ")
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(if (interactive-p) (setq lm (prefix-numeric-value lm)))
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(save-excursion
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(goto-char from)
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(skip-chars-backward " \t")
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(if (bolp) (setq from (point))))
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(put-text-property from to 'right-margin lm)
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(if auto-fill-function (save-excursion (fill-region from to nil t t))))
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(defun alter-text-property (from to prop func &optional object)
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"Programmatically change value of a text-property.
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For each region between FROM and TO that has a single value for PROPERTY,
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apply FUNCTION to that value and sets the property to the function's result.
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Optional fifth argument OBJECT specifies the string or buffer to operate on."
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(let ((begin from)
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end val)
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(while (setq val (get-text-property begin prop object)
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end (text-property-not-all begin to prop val object))
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(put-text-property begin end prop (funcall func val) object)
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(setq begin end))
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(if (< begin to)
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(put-text-property begin to prop (funcall func val) object))))
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(defun increase-left-margin (from to inc)
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"Increase or decrease the left-margin of the region.
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With no prefix argument, this adds `standard-indent' of indentation.
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A prefix arg (optional third arg INC noninteractively) specifies the amount
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to change the margin by, in characters.
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If `auto-fill-mode' is active, re-fill the region to fit the new margin."
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(interactive "*r\nP")
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(setq inc (if inc (prefix-numeric-value inc) standard-indent))
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(save-excursion
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(goto-char from)
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(skip-chars-backward " \t")
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(if (bolp) (setq from (point)))
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(goto-char to)
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(setq to (point-marker)))
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(alter-text-property from to 'left-margin
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(lambda (v) (max (- left-margin) (+ inc (or v 0)))))
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(indent-rigidly from to inc)
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(if auto-fill-function (save-excursion (fill-region from to nil t t)))
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(move-marker to nil))
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(defun decrease-left-margin (from to inc)
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"Make the left margin of the region smaller.
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With no prefix argument, decrease the indentation by `standard-indent'.
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A prefix arg (optional third arg INC noninteractively) specifies the amount
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to change the margin by, in characters.
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If `auto-fill-mode' is active, re-fill the region to fit the new margin."
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(interactive "*r\nP")
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(setq inc (if inc (prefix-numeric-value inc) standard-indent))
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(increase-left-margin from to (- inc)))
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(defun increase-right-margin (from to inc)
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"Increase the right-margin of the region.
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With no prefix argument, increase the right margin by `standard-indent'.
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A prefix arg (optional third arg INC noninteractively) specifies the amount
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to change the margin by, in characters. A negative argument decreases
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the right margin width.
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If `auto-fill-mode' is active, re-fill the region to fit the new margin."
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(interactive "r\nP")
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(if (interactive-p)
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(setq inc (if inc (prefix-numeric-value current-prefix-arg)
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standard-indent)))
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(save-excursion
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(alter-text-property from to 'right-margin
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(lambda (v) (+ inc (or v 0))))
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(if auto-fill-function
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(fill-region from to nil t t))))
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(defun decrease-right-margin (from to inc)
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"Make the right margin of the region smaller.
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With no prefix argument, decrease the right margin by `standard-indent'.
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A prefix arg (optional third arg INC noninteractively) specifies the amount
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of width to remove, in characters. A negative argument increases
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the right margin width.
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If `auto-fill-mode' is active, re-fills region to fit in new margin."
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(interactive "*r\nP")
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(setq inc (if inc (prefix-numeric-value inc) standard-indent))
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(increase-right-margin from to (- inc)))
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(defun beginning-of-line-text (&optional n)
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"Move to the beginning of the text on this line.
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With optional argument, move forward N-1 lines first.
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From the beginning of the line, moves past the left-margin indentation, the
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fill-prefix, and any indentation used for centering or right-justifying the
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line, but does not move past any whitespace that was explicitly inserted
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\(such as a tab used to indent the first line of a paragraph)."
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(interactive "p")
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(beginning-of-line n)
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(skip-chars-forward " \t")
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;; Skip over fill-prefix.
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(if (and fill-prefix
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(not (string-equal fill-prefix "")))
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(if (equal fill-prefix
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(buffer-substring
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(point) (min (point-max) (+ (length fill-prefix) (point)))))
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(forward-char (length fill-prefix)))
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(if (and adaptive-fill-mode adaptive-fill-regexp
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(looking-at adaptive-fill-regexp))
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(goto-char (match-end 0))))
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;; Skip centering or flushright indentation
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(if (memq (current-justification) '(center right))
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(skip-chars-forward " \t")))
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(defvar indent-region-function nil
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"Short cut function to indent region using `indent-according-to-mode'.
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A value of nil means really run `indent-according-to-mode' on each line.")
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(defun indent-region (start end &optional column)
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"Indent each nonblank line in the region.
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A numeric prefix argument specifies a column: indent each line to that column.
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With no prefix argument, the command chooses one of these methods and
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indents all the lines with it:
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1) If `fill-prefix' is non-nil, insert `fill-prefix' at the
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beginning of each line in the region that does not already begin
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with it.
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2) If `indent-region-function' is non-nil, call that function
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to indent the region.
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3) Indent each line as specified by the variable `indent-line-function'.
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Called from a program, START and END specify the region to indent.
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If the third argument COLUMN is an integer, it specifies the
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column to indent to; if it is nil, use one of the three methods above."
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(interactive "r\nP")
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(if (null column)
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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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(and (bolp) (eolp))
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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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(setq end (copy-marker end))
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(goto-char start)
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(while (< (point) end)
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(or (and (bolp) (eolp))
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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 column (prefix-numeric-value column))
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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 column 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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If the previous nonblank line has no indent points beyond the
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column point starts at, this command does nothing.
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See also `indent-relative'."
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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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The following line shows the indentation points in this line.
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^ ^ ^ ^ ^ ^ ^ ^ ^
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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, unless
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this command is invoked with a numeric argument, in which case it
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does nothing.
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See also `indent-relative-maybe'."
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(interactive "P")
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(if (and abbrev-mode
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(eq (char-syntax (preceding-char)) ?w))
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(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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(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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(defcustom 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-stop'.
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This should be a list of integers, ordered from smallest to largest."
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:group 'indent
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:type '(repeat integer))
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(defvar edit-tab-stops-map
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(let ((map (make-sparse-keymap)))
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(define-key map "\C-x\C-s" 'edit-tab-stops-note-changes)
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(define-key map "\C-c\C-c" 'edit-tab-stops-note-changes)
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map)
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"Keymap used in `edit-tab-stops'.")
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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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(and abbrev-mode (= (char-syntax (preceding-char)) ?w)
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(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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(let ((opoint (point)))
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(delete-horizontal-space t)
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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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(let ((before (point)))
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(move-to-column (car tabs) t)
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(save-excursion
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(goto-char before)
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;; If we just added a tab, or moved over one,
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;; delete any superfluous spaces before the old point.
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(if (and (eq (preceding-char) ?\ )
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(eq (following-char) ?\t))
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(let ((tabend (* (/ (current-column) tab-width) tab-width)))
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(while (and (> (current-column) tabend)
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(eq (preceding-char) ?\ ))
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(forward-char -1))
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(delete-region (point) before))))))))
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(define-key global-map "\t" 'indent-for-tab-command)
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(define-key esc-map "\C-\\" '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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