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428
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1 ;;; rect.el --- rectangle functions for XEmacs.
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2
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3 ;; Copyright (C) 1985, 1993, 1994, 1999 Free Software Foundation, Inc.
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4
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5 ;; Maintainer: Didier Verna <verna@inf.enst.fr>
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6 ;; Keywords: internal
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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, Inc., 59 Temple Place - Suite 330, Boston, MA
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23 ;; 02111-1307, USA.
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24
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25 ;;; Synched up with: to be incorporated in a forthcoming GNU Emacs
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26
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27 ;;; Commentary:
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28
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29 ;; This package provides the operations on rectangles that are documented
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30 ;; in the XEmacs Reference Manual.
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31
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32 ;; ### NOTE: this file has been almost completely rewritten by Didier Verna
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33 ;; <verna@inf.enst.fr>, Jul 99. The purpose of this rewrite is to be less
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34 ;; intrusive and fill lines with whitespaces only when needed. A few functions
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35 ;; are untouched though, as noted above their definition.
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36
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37
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38 ;;; Code:
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39
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40 ;; ### NOTE: this function is untouched, but not used anymore.
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41 ;; `apply-on-rectangle' is used instead. It's still there because it's
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42 ;; documented so people might use it in their code, so I've decided not to
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43 ;; touch it. --dv
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44 ;; XEmacs: extra-args
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45 (defun operate-on-rectangle (function start end coerce-tabs &rest extra-args)
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46 "Call FUNCTION for each line of rectangle with corners at START, END.
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47 If COERCE-TABS is non-nil, convert multi-column characters
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48 that span the starting or ending columns on any line
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49 to multiple spaces before calling FUNCTION.
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50 FUNCTION is called with three arguments:
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51 position of start of segment of this line within the rectangle,
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52 number of columns that belong to rectangle but are before that position,
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53 number of columns that belong to rectangle but are after point.
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54 Point is at the end of the segment of this line within the rectangle."
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55 (let (startcol startlinepos endcol endlinepos)
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56 (save-excursion
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57 (goto-char start)
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58 (setq startcol (current-column))
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59 (beginning-of-line)
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60 (setq startlinepos (point)))
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61 (save-excursion
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62 (goto-char end)
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63 (setq endcol (current-column))
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64 (forward-line 1)
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65 (setq endlinepos (point-marker)))
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66 (if (< endcol startcol)
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67 ;; XEmacs
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68 (let ((tem startcol))
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69 (setq startcol endcol endcol tem)))
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70 (save-excursion
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71 (goto-char startlinepos)
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72 (while (< (point) endlinepos)
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73 (let (startpos begextra endextra)
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74 (move-to-column startcol coerce-tabs)
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75 (setq begextra (- (current-column) startcol))
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76 (setq startpos (point))
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77 (move-to-column endcol coerce-tabs)
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78 (setq endextra (- endcol (current-column)))
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79 (if (< begextra 0)
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80 (setq endextra (+ endextra begextra)
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81 begextra 0))
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82 (if (< endextra 0) (setq endextra 0))
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83 (apply function startpos begextra endextra extra-args))
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84 (forward-line 1)))
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85 (- endcol startcol)))
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86
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87 ;; The replacement for `operate-on-rectangle' -- dv
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88 (defun apply-on-rectangle (function start end &rest args)
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89 "Call FUNCTION for each line of rectangle with corners at START and END.
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90 FUNCTION is called with two arguments: the start and end columns of the
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91 rectangle, plus ARGS extra arguments. Point is at the beginning of line
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92 when the function is called."
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93 (let (startcol startpt endcol endpt)
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94 (save-excursion
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95 (goto-char start)
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96 (setq startcol (current-column))
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97 (beginning-of-line)
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98 (setq startpt (point))
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99 (goto-char end)
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100 (setq endcol (current-column))
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101 (forward-line 1)
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102 (setq endpt (point-marker))
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103 ;; ensure the start column is the left one.
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104 (if (< endcol startcol)
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105 (let ((col startcol))
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106 (setq startcol endcol endcol col)))
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107 ;; start looping over lines
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108 (goto-char startpt)
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109 (while (< (point) endpt)
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110 (apply function startcol endcol args)
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111 (forward-line 1)))
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112 ))
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113
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114 ;; I love ascii art ;-)
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115 (defconst spaces-strings '[""
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116 " "
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117 " "
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118 " "
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119 " "
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120 " "
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121 " "
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122 " "
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123 " "])
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124
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125
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126 ;; This function is untouched --dv
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127 (defun spaces-string (n)
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128 (if (<= n 8) (aref spaces-strings n)
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129 (let ((val ""))
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130 (while (> n 8)
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131 (setq val (concat " " val)
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132 n (- n 8)))
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133 (concat val (aref spaces-strings n)))))
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134
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135 ;;;###autoload
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136 (defvar killed-rectangle nil
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137 "Rectangle for `yank-rectangle' to insert.")
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138
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139 ;;;###autoload
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140 (defun kill-rectangle (start end &optional fill)
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141 "Delete the region-rectangle and save it as the last killed one.
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142 You might prefer to use `delete-extract-rectangle' from a program.
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143
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144 When called from a program, the rectangle's corners are START and END.
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145 With a prefix (or FILL) argument, also fill lines where nothing has to be
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146 deleted."
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147 (interactive "*r\nP")
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148 (when buffer-read-only
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149 (setq killed-rectangle (extract-rectangle start end))
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150 (barf-if-buffer-read-only))
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151 (setq killed-rectangle (delete-extract-rectangle start end fill)))
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152
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153 ;;;###autoload
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154 (defun delete-rectangle (start end &optional fill)
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155 "Delete the text in the region-rectangle without saving it.
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156 The same range of columns is deleted in each line starting with the line
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157 where the region begins and ending with the line where the region ends.
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158
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159 When called from a program, the rectangle's corners are START and END.
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160 With a prefix (or FILL) argument, also fill lines where nothing has to be
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161 deleted."
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162 (interactive "*r\nP")
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163 (apply-on-rectangle 'delete-rectangle-line start end fill))
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164
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165 (defun delete-rectangle-line (startcol endcol fill)
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166 (let ((pt (point-at-eol)))
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167 (when (= (move-to-column startcol (or fill 'coerce)) startcol)
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168 (if (and (not fill) (<= pt endcol))
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169 (delete-region (point) pt)
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170 ;; else
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171 (setq pt (point))
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172 (move-to-column endcol t)
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173 (delete-region pt (point))))
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174 ))
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175
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176 ;;;###autoload
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177 (defun delete-extract-rectangle (start end &optional fill)
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178 "Delete the contents of the rectangle with corners at START and END, and
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179 return it as a list of strings, one for each line of the rectangle.
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180
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181 With an optional FILL argument, also fill lines where nothing has to be
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182 deleted."
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183 (let ((lines (list nil)))
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184 (apply-on-rectangle 'delete-extract-rectangle-line start end lines fill)
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185 (nreverse (cdr lines))))
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186
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187 (defun delete-extract-rectangle-line (startcol endcol lines fill)
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188 (let ((pt (point-at-eol)))
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189 (if (< (move-to-column startcol (or fill 'coerce)) startcol)
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190 (setcdr lines (cons (spaces-string (- endcol startcol))
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191 (cdr lines)))
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192 ;; else
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193 (setq pt (point))
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194 (move-to-column endcol t)
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195 (setcdr lines (cons (buffer-substring pt (point)) (cdr lines)))
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196 (delete-region pt (point)))
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197 ))
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198
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199 ;;;###autoload
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200 (defun extract-rectangle (start end)
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201 "Return the contents of the rectangle with corners at START and END,
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202 as a list of strings, one for each line of the rectangle."
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203 (let ((lines (list nil)))
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204 (apply-on-rectangle 'extract-rectangle-line start end lines)
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205 (nreverse (cdr lines))))
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206
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207 ;; ### NOTE: this is actually the only function that needs to do complicated
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208 ;; stuff like what's happening in `operate-on-rectangle', because the buffer
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209 ;; might be read-only. --dv
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210 (defun extract-rectangle-line (startcol endcol lines)
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211 (let (start end begextra endextra line)
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212 (move-to-column startcol)
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213 (setq start (point)
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214 begextra (- (current-column) startcol))
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215 (move-to-column endcol)
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216 (setq end (point)
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217 endextra (- endcol (current-column)))
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218 (setq line (buffer-substring start (point)))
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219 (if (< begextra 0)
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220 (setq endextra (+ endextra begextra)
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221 begextra 0))
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222 (if (< endextra 0)
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223 (setq endextra 0))
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224 (goto-char start)
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225 (while (search-forward "\t" end t)
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226 (let ((width (- (current-column)
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227 (save-excursion (forward-char -1)
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228 (current-column)))))
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229 (setq line (concat (substring line 0 (- (point) end 1))
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230 (spaces-string width)
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231 (substring line (+ (length line)
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232 (- (point) end)))))))
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233 (if (or (> begextra 0) (> endextra 0))
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234 (setq line (concat (spaces-string begextra)
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235 line
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236 (spaces-string endextra))))
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237 (setcdr lines (cons line (cdr lines)))))
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238
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239 ;; This function is untouched --dv
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240 ;;;###autoload
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241 (defun yank-rectangle ()
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242 "Yank the last killed rectangle with upper left corner at point."
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243 (interactive "*")
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244 (insert-rectangle killed-rectangle))
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245
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246 ;; This function is untouched --dv
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247 ;;;###autoload
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248 (defun insert-rectangle (rectangle)
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249 "Insert text of RECTANGLE with upper left corner at point.
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250 RECTANGLE's first line is inserted at point, its second
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251 line is inserted at a point vertically under point, etc.
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252 RECTANGLE should be a list of strings.
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253 After this command, the mark is at the upper left corner
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254 and point is at the lower right corner."
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255 (let ((lines rectangle)
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256 (insertcolumn (current-column))
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257 (first t))
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258 (push-mark)
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259 (while lines
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260 (or first
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261 (progn
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262 (forward-line 1)
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263 (or (bolp) (insert ?\n))
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264 (move-to-column insertcolumn t)))
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265 (setq first nil)
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266 (insert (car lines))
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267 (setq lines (cdr lines)))))
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268
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269 ;;;###autoload
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270 (defun open-rectangle (start end &optional fill)
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271 "Blank out the region-rectangle, shifting text right.
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272
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273 When called from a program, the rectangle's corners are START and END.
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274 With a prefix (or FILL) argument, fill with blanks even if there is no text
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275 on the right side of the rectangle."
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276 (interactive "*r\nP")
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277 (apply-on-rectangle 'open-rectangle-line start end fill)
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278 (goto-char start))
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279
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280 (defun open-rectangle-line (startcol endcol fill)
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281 (let (spaces)
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282 (when (= (move-to-column startcol (or fill 'coerce)) startcol)
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283 (unless (and (not fill)
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284 (= (point) (point-at-eol)))
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285 (indent-to endcol)))
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286 ))
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287
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288 ;;;###autoload
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289 (defun string-rectangle (start end string)
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290 "Insert STRING on each line of the region-rectangle, shifting text right.
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291 The left edge of the rectangle specifies the column for insertion. This
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292 command does not delete or overwrite any existing text.
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293
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294 When called from a program, the rectangle's corners are START and END."
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295 (interactive "*r\nsString rectangle: ")
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296 (apply-on-rectangle 'string-rectangle-line start end string))
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297
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298 (defun string-rectangle-line (startcol endcol string)
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299 (move-to-column startcol t)
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300 (insert string))
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301
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302 ;;;###autoload
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303 (defun clear-rectangle (start end &optional fill)
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304 "Blank out the region-rectangle.
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305 The text previously in the region is overwritten with blanks.
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306
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307 When called from a program, the rectangle's corners are START and END.
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308 With a prefix (or FILL) argument, also fill with blanks the parts of the
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309 rectangle which were empty."
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310 (interactive "*r\nP")
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311 (apply-on-rectangle 'clear-rectangle-line start end fill))
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312
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313 (defun clear-rectangle-line (startcol endcol fill)
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314 (let ((pt (point-at-eol))
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315 spaces)
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316 (when (= (move-to-column startcol (or fill 'coerce)) startcol)
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317 (if (and (not fill)
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318 (<= (save-excursion (goto-char pt) (current-column)) endcol))
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319 (delete-region (point) pt)
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320 ;; else
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321 (setq pt (point))
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322 (move-to-column endcol t)
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323 (setq spaces (- (point) pt))
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324 (delete-region pt (point))
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325 (indent-to (+ (current-column) spaces))))
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326 ))
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327
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328 (provide 'rect)
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329
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330 ;;; rect.el ends here
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