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1 ;;; indent.el --- indentation commands for XEmacs
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2 ;; Keywords: lisp languages tools
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3
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4 ;; Copyright (C) 1985, 1992, 1993, 1995 Free Software Foundation, Inc.
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5
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6 ;; Maintainer: FSF
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7
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8 ;; This file is part of XEmacs.
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9
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10 ;; XEmacs is free software; you can redistribute it and/or modify it
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11 ;; under the terms of the GNU General Public License as published by
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12 ;; the Free Software Foundation; either version 2, or (at your option)
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13 ;; any later version.
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14
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15 ;; XEmacs is distributed in the hope that it will be useful, but
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16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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18 ;; General Public License for more details.
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19
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20 ;; You should have received a copy of the GNU General Public License
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21 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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22 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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23
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24 ;;; Synched up with: FSF 19.30.
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25
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26 ;;; Commentary:
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27
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28 ;; Commands for making and changing indentation in text. These are
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29 ;; described in the XEmacs Reference Manual.
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30
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31 ;;; Code:
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32
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33 (defvar standard-indent 4 "\
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34 Default number of columns for margin-changing functions to indent.")
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35
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36 (defvar indent-line-function 'indent-to-left-margin
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37 "Function to indent current line.")
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38
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39 (defun indent-according-to-mode ()
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40 "Indent line in proper way for current major mode."
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41 (interactive)
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42 (funcall indent-line-function))
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43
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44 (defun indent-for-tab-command (&optional prefix-arg)
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45 "Indent line in proper way for current major mode."
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46 (interactive "P")
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47 (if (eq indent-line-function 'indent-to-left-margin)
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48 (insert-tab)
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49 (if prefix-arg
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50 (funcall indent-line-function prefix-arg)
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51 (funcall indent-line-function))))
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52
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53 (defun insert-tab ()
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54 (if abbrev-mode
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55 (expand-abbrev))
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56 (if indent-tabs-mode
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57 (insert ?\t)
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58 (indent-to (* tab-width (1+ (/ (current-column) tab-width))))))
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59
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60 (defun indent-rigidly (start end arg)
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61 "Indent all lines starting in the region sideways by ARG columns.
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62 Called from a program, takes three arguments, START, END and ARG."
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63 (interactive "r\np")
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64 (save-excursion
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65 (goto-char end)
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66 (setq end (point-marker))
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67 (goto-char start)
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68 (or (bolp) (forward-line 1))
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69 (while (< (point) end)
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70 (let ((indent (current-indentation))
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71 eol-flag)
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72 (save-excursion
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73 (skip-chars-forward " \t")
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74 (setq eol-flag (eolp)))
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75 (or eol-flag
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76 (indent-to (max 0 (+ indent arg)) 0))
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77 (delete-region (point) (progn (skip-chars-forward " \t") (point))))
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78 (forward-line 1))
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79 (move-marker end nil)
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80 (setq zmacs-region-stays nil)))
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81
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82 (defun indent-line-to (column)
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83 "Indent current line to COLUMN.
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84 This function removes or adds spaces and tabs at beginning of line
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85 only if necessary. It leaves point at end of indentation."
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86 (back-to-indentation)
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87 (let ((cur-col (current-column)))
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88 (cond ((< cur-col column)
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89 (if (> (- column (* (/ cur-col tab-width) tab-width)) tab-width)
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90 (delete-region (point)
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91 (progn (skip-chars-backward " ") (point))))
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92 (indent-to column))
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93 ((> cur-col column) ; too far right (after tab?)
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94 (delete-region (progn (move-to-column column t) (point))
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95 (progn (back-to-indentation) (point)))))))
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96
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97 (defun current-left-margin ()
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98 "Return the left margin to use for this line.
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99 This is the value of the buffer-local variable `left-margin' plus the value
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100 of the `left-margin' text-property at the start of the line."
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101 (save-excursion
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102 (back-to-indentation)
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103 (max 0
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104 (+ left-margin (or (get-text-property
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105 (if (and (eobp) (not (bobp)))
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106 (1- (point)) (point))
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107 'left-margin) 0)))))
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108
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109 (defun move-to-left-margin (&optional n force)
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110 "Move to the left margin of the current line.
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111 With optional argument, move forward N-1 lines first.
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112 The column moved to is the one given by the `current-left-margin' function.
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113 If the line's indentation appears to be wrong, and this command is called
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114 interactively or with optional argument FORCE, it will be fixed."
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115 (interactive (list (prefix-numeric-value current-prefix-arg) t))
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116 (beginning-of-line n)
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117 (skip-chars-forward " \t")
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118 (let ((lm (current-left-margin))
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119 (cc (current-column)))
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120 (cond ((> cc lm)
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121 (if (> (move-to-column lm force) lm)
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122 ;; If lm is in a tab and we are not forcing, move before tab
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123 (backward-char 1)))
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124 ((and force (< cc lm))
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125 (indent-to-left-margin)))))
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126
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127 ;; This is the default indent-line-function,
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128 ;; used in Fundamental Mode, Text Mode, etc.
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129 (defun indent-to-left-margin ()
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130 "Indent current line to the column given by `current-left-margin'."
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131 (indent-line-to (current-left-margin)))
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132
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133 (defun delete-to-left-margin (&optional from to)
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134 "Remove left margin indentation from a region.
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135 This deletes to the column given by `current-left-margin'.
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136 In no case will it delete non-whitespace.
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137 Args FROM and TO are optional; default is the whole buffer."
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138 (save-excursion
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139 (goto-char (or to (point-max)))
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140 (setq to (point-marker))
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141 (goto-char (or from (point-min)))
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142 (or (bolp) (forward-line 1))
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143 (while (< (point) to)
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144 (delete-region (point) (progn (move-to-left-margin nil t) (point)))
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145 (forward-line 1))
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146 (move-marker to nil)))
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147
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148 (defun set-left-margin (from to lm)
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149 "Set the left margin of the region to WIDTH.
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150 If `auto-fill-mode' is active, re-fill the region to fit the new margin."
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151 (interactive "r\nNSet left margin to column: ")
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152 (if (interactive-p) (setq lm (prefix-numeric-value lm)))
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153 (save-excursion
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154 ;; If inside indentation, start from BOL.
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155 (goto-char from)
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156 (skip-chars-backward " \t")
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157 (if (bolp) (setq from (point)))
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158 ;; Place end after whitespace
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159 (goto-char to)
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160 (skip-chars-forward " \t")
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161 (setq to (point-marker)))
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162 ;; Delete margin indentation first, but keep paragraph indentation.
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163 (delete-to-left-margin from to)
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164 (put-text-property from to 'left-margin lm)
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165 (indent-rigidly from to lm)
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166 (if auto-fill-function (save-excursion (fill-region from to nil t t)))
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167 (move-marker to nil))
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168
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169 (defun set-right-margin (from to lm)
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170 "Set the right margin of the region to WIDTH.
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171 If `auto-fill-mode' is active, re-fill the region to fit the new margin."
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172 (interactive "r\nNSet right margin to width: ")
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173 (if (interactive-p) (setq lm (prefix-numeric-value lm)))
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174 (save-excursion
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175 (goto-char from)
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176 (skip-chars-backward " \t")
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177 (if (bolp) (setq from (point))))
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178 (put-text-property from to 'right-margin lm)
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179 (if auto-fill-function (save-excursion (fill-region from to nil t t))))
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180
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181 (defun alter-text-property (from to prop func &optional object)
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182 "Programmatically change value of a text-property.
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183 For each region between FROM and TO that has a single value for PROPERTY,
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184 apply FUNCTION to that value and sets the property to the function's result.
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185 Optional fifth argument OBJECT specifies the string or buffer to operate on."
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186 (let ((begin from)
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187 end val)
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188 (while (setq val (get-text-property begin prop object)
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189 end (text-property-not-all begin to prop val object))
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190 (put-text-property begin end prop (funcall func val) object)
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191 (setq begin end))
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192 (if (< begin to)
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193 (put-text-property begin to prop (funcall func val) object))))
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194
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195 (defun increase-left-margin (from to inc)
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196 "Increase or decrease the left-margin of the region.
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197 With no prefix argument, this adds `standard-indent' of indentation.
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198 A prefix arg (optional third arg INC noninteractively) specifies the amount
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199 to change the margin by, in characters.
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200 If `auto-fill-mode' is active, re-fill the region to fit the new margin."
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201 (interactive "*r\nP")
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202 (setq inc (if inc (prefix-numeric-value inc) standard-indent))
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203 (save-excursion
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204 (goto-char from)
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205 (skip-chars-backward " \t")
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206 (if (bolp) (setq from (point)))
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207 (goto-char to)
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208 (setq to (point-marker)))
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209 (alter-text-property from (marker-position to) 'left-margin
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210 (lambda (v) (max (- left-margin) (+ inc (or v 0)))))
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211 (indent-rigidly from (marker-position to) inc)
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212 (if auto-fill-function
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213 (save-excursion
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214 (fill-region from (marker-position to) nil t t)))
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215 (move-marker to nil))
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216
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217 (defun decrease-left-margin (from to inc)
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218 "Make the left margin of the region smaller.
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219 With no prefix argument, decrease the indentation by `standard-indent'.
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220 A prefix arg (optional third arg INC noninteractively) specifies the amount
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221 to change the margin by, in characters.
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222 If `auto-fill-mode' is active, re-fill the region to fit the new margin."
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223 (interactive "*r\nP")
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224 (setq inc (if inc (prefix-numeric-value inc) standard-indent))
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225 (increase-left-margin from to (- inc)))
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226
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227 (defun increase-right-margin (from to inc)
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228 "Increase the right-margin of the region.
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229 With no prefix argument, increase the right margin by `standard-indent'.
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230 A prefix arg (optional third arg INC noninteractively) specifies the amount
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231 to change the margin by, in characters. A negative argument decreases
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232 the right margin width.
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233 If `auto-fill-mode' is active, re-fill the region to fit the new margin."
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234 (interactive "r\nP")
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235 (if (interactive-p)
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236 (setq inc (if inc (prefix-numeric-value current-prefix-arg)
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237 standard-indent)))
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238 (save-excursion
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239 (alter-text-property from to 'right-margin
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240 (lambda (v) (+ inc (or v 0))))
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241 (if auto-fill-function
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242 (fill-region from to nil t t))))
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243
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244 (defun decrease-right-margin (from to inc)
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245 "Make the right margin of the region smaller.
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246 With no prefix argument, decrease the right margin by `standard-indent'.
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247 A prefix arg (optional third arg INC noninteractively) specifies the amount
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248 of width to remove, in characters. A negative argument increases
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249 the right margin width.
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250 If `auto-fill-mode' is active, re-fills region to fit in new margin."
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251 (interactive "*r\nP")
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252 (setq inc (if inc (prefix-numeric-value inc) standard-indent))
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253 (increase-right-margin from to (- inc)))
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254
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255 (defun beginning-of-line-text (&optional n)
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256 "Move to the beginning of the text on this line.
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257 With optional argument, move forward N-1 lines first.
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258 From the beginning of the line, moves past the left-margin indentation, the
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259 fill-prefix, and any indentation used for centering or right-justifying the
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260 line, but does not move past any whitespace that was explicitly inserted
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261 \(such as a tab used to indent the first line of a paragraph)."
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262 (interactive "p")
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263 (beginning-of-line n)
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264 (skip-chars-forward " \t")
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265 ;; Skip over fill-prefix.
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266 (if (and fill-prefix
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267 (not (string-equal fill-prefix "")))
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268 (if (equal fill-prefix
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269 (buffer-substring
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270 (point) (min (point-max) (+ (length fill-prefix) (point)))))
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271 (forward-char (length fill-prefix)))
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272 (if (and adaptive-fill-mode
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273 (looking-at adaptive-fill-regexp))
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274 (goto-char (match-end 0))))
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275 ;; Skip centering or flushright indentation
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276 (if (memq (current-justification) '(center right))
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277 (skip-chars-forward " \t")))
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278
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279 (defvar indent-region-function nil
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280 "Short cut function to indent region using `indent-according-to-mode'.
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281 A value of nil means really run `indent-according-to-mode' on each line.")
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282
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283 (defun indent-region (start end column)
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284 "Indent each nonblank line in the region.
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285 With no argument, indent each line using `indent-according-to-mode',
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286 or use `indent-region-function' to do the whole region if that's non-nil.
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287 If there is a fill prefix, make each line start with the fill prefix.
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288 With argument COLUMN, indent each line to that column.
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289 Called from a program, takes three args: START, END and COLUMN."
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290 (interactive "r\nP")
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291 (if (null column)
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292 (if fill-prefix
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293 (save-excursion
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294 (goto-char end)
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295 (setq end (point-marker))
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296 (goto-char start)
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297 (let ((regexp (regexp-quote fill-prefix)))
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298 (while (< (point) end)
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299 (or (looking-at regexp)
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300 (and (bolp) (eolp))
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301 (insert fill-prefix))
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302 (forward-line 1))))
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303 (if indent-region-function
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304 (funcall indent-region-function start end)
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305 (save-excursion
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306 (goto-char end)
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307 (setq end (point-marker))
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308 (goto-char start)
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309 (or (bolp) (forward-line 1))
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310 (while (< (point) end)
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311 (or (and (bolp) (eolp))
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312 (funcall indent-line-function))
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313 (forward-line 1))
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314 (move-marker end nil))))
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315 (setq column (prefix-numeric-value column))
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316 (save-excursion
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317 (goto-char end)
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318 (setq end (point-marker))
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319 (goto-char start)
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320 (or (bolp) (forward-line 1))
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321 (while (< (point) end)
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322 (delete-region (point) (progn (skip-chars-forward " \t") (point)))
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323 (or (eolp)
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324 (indent-to column 0))
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325 (forward-line 1))
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326 (move-marker end nil))))
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327
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328 (defun indent-relative-maybe ()
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329 "Indent a new line like previous nonblank line."
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330 (interactive)
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331 (indent-relative t))
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332
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333 (defun indent-relative (&optional unindented-ok)
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334 "Space out to under next indent point in previous nonblank line.
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335 An indent point is a non-whitespace character following whitespace.
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336 If the previous nonblank line has no indent points beyond
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337 the column point starts at, `tab-to-tab-stop' is done instead."
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338 (interactive "P")
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339 (if abbrev-mode (expand-abbrev))
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340 (let ((start-column (current-column))
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341 indent)
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342 (save-excursion
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343 (beginning-of-line)
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344 (if (re-search-backward "^[^\n]" nil t)
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345 (let ((end (save-excursion (forward-line 1) (point))))
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346 (move-to-column start-column)
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347 ;; Is start-column inside a tab on this line?
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348 (if (> (current-column) start-column)
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349 (backward-char 1))
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350 (or (looking-at "[ \t]")
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351 unindented-ok
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352 (skip-chars-forward "^ \t" end))
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353 (skip-chars-forward " \t" end)
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354 (or (= (point) end) (setq indent (current-column))))))
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355 (if indent
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356 (let ((opoint (point-marker)))
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357 (delete-region (point) (progn (skip-chars-backward " \t") (point)))
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358 (indent-to indent 0)
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359 (if (> opoint (point))
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360 (goto-char opoint))
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361 (move-marker opoint nil))
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362 (tab-to-tab-stop))))
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363
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364 (defvar tab-stop-list
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365 '(8 16 24 32 40 48 56 64 72 80 88 96 104 112 120)
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366 "*List of tab stop positions used by `tab-to-tab-stops'.
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367 This should be a list of integers, ordered from smallest to largest.")
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368
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369 (defvar edit-tab-stops-map nil "Keymap used in `edit-tab-stops'.")
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370 (if edit-tab-stops-map
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371 nil
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372 (setq edit-tab-stops-map (make-sparse-keymap))
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373 (define-key edit-tab-stops-map "\C-x\C-s" 'edit-tab-stops-note-changes)
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374 (define-key edit-tab-stops-map "\C-c\C-c" 'edit-tab-stops-note-changes))
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375
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376 (defvar edit-tab-stops-buffer nil
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377 "Buffer whose tab stops are being edited--in case
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378 the variable `tab-stop-list' is local in that buffer.")
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379
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380 (defun edit-tab-stops ()
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381 "Edit the tab stops used by `tab-to-tab-stop'.
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382 Creates a buffer *Tab Stops* containing text describing the tab stops.
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383 A colon indicates a column where there is a tab stop.
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384 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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385 (interactive)
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386 (setq edit-tab-stops-buffer (current-buffer))
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387 (switch-to-buffer (get-buffer-create "*Tab Stops*"))
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388 ;; #### I18N3 should mark buffer as output-translating
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389 (use-local-map edit-tab-stops-map)
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390 (make-local-variable 'indent-tabs-mode)
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391 (setq indent-tabs-mode nil)
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392 (overwrite-mode 1)
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393 (setq truncate-lines t)
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394 (erase-buffer)
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395 (let ((tabs tab-stop-list))
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396 (while tabs
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397 (indent-to (car tabs) 0)
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398 (insert ?:)
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399 (setq tabs (cdr tabs))))
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400 (let ((count 0))
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401 (insert ?\n)
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402 (while (< count 8)
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403 (insert (+ count ?0))
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404 (insert " ")
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405 (setq count (1+ count)))
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406 (insert ?\n)
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407 (while (> count 0)
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408 (insert "0123456789")
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409 (setq count (1- count))))
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410 (insert (substitute-command-keys "\nTo install changes, type \\<edit-tab-stops-map>\\[edit-tab-stops-note-changes]"))
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411 (goto-char (point-min)))
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412
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413 (defun edit-tab-stops-note-changes ()
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414 "Put edited tab stops into effect."
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415 (interactive)
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416 (let (tabs)
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417 (save-excursion
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418 (goto-char 1)
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419 (end-of-line)
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420 (while (search-backward ":" nil t)
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421 (setq tabs (cons (current-column) tabs))))
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422 (bury-buffer (prog1 (current-buffer)
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423 (switch-to-buffer edit-tab-stops-buffer)))
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424 (setq tab-stop-list tabs))
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425 (message "Tab stops installed"))
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426
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427 (defun tab-to-tab-stop ()
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428 "Insert spaces or tabs to next defined tab-stop column.
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429 The variable `tab-stop-list' is a list of columns at which there are tab stops.
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430 Use \\[edit-tab-stops] to edit them interactively."
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431 (interactive)
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432 (and abbrev-mode (= (char-syntax (preceding-char)) ?w)
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433 (expand-abbrev))
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434 (let ((tabs tab-stop-list))
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435 (while (and tabs (>= (current-column) (car tabs)))
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436 (setq tabs (cdr tabs)))
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437 (if tabs
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438 (let ((opoint (point)))
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439 (skip-chars-backward " \t")
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440 (delete-region (point) opoint)
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441 (indent-to (car tabs)))
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442 (insert ?\ ))))
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443
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444 (defun move-to-tab-stop ()
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445 "Move point to next defined tab-stop column.
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446 The variable `tab-stop-list' is a list of columns at which there are tab stops.
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447 Use \\[edit-tab-stops] to edit them interactively."
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448 (interactive)
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449 (let ((tabs tab-stop-list))
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450 (while (and tabs (>= (current-column) (car tabs)))
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451 (setq tabs (cdr tabs)))
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452 (if tabs
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453 (let ((before (point)))
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454 (move-to-column (car tabs) t)
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455 (save-excursion
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456 (goto-char before)
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457 ;; If we just added a tab, or moved over one,
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458 ;; delete any superfluous spaces before the old point.
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459 (if (and (eq (preceding-char) ?\ )
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460 (eq (following-char) ?\t))
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461 (let ((tabend (* (/ (current-column) tab-width) tab-width)))
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462 (while (and (> (current-column) tabend)
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463 (eq (preceding-char) ?\ ))
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464 (forward-char -1))
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465 (delete-region (point) before))))))))
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466
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467 ;;; indent.el ends here
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