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1 ;;; tpu-extras.el --- Scroll margins and free cursor mode for TPU-edt
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3 ;; Copyright (C) 1993, 1994, 1995 Free Software Foundation, Inc.
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4
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5 ;; Author: Rob Riepel <riepel@networking.stanford.edu>
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6 ;; Maintainer: Rob Riepel <riepel@networking.stanford.edu>
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7 ;; Keywords: emulations
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8
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9 ;; This file is part of XEmacs.
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10 ;; XEmacs modifications by Kevin Oberman <oberman@es.net>
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11
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12 ;; XEmacs is free software; you can redistribute it and/or modify it
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13 ;; under the terms of the GNU General Public License as published by
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14 ;; the Free Software Foundation; either version 2, or (at your option)
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15 ;; any later version.
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16
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17 ;; XEmacs is distributed in the hope that it will be useful, but
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18 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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20 ;; GNU General Public License for more details.
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21
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22 ;; You should have received a copy of the GNU General Public License
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23 ;; along with XEmacs; see the file COPYING. If not, write to the
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24 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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25 ;; Boston, MA 02111-1307, USA.
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26
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27 ;;; Synced up with FSF 19.34 and XEmacs 19.16
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28
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29 ;;; Commentary:
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30
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31 ;; Use the functions defined here to customize TPU-edt to your tastes by
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32 ;; setting scroll margins and/or turning on free cursor mode. Here's an
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33 ;; example for your .emacs file.
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34
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35 ;; (tpu-set-cursor-free) ; Set cursor free.
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36 ;; (tpu-set-scroll-margins "10%" "15%") ; Set scroll margins.
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37
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38 ;; Scroll margins and cursor binding can be changed from within emacs using
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39 ;; the following commands:
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40
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41 ;; tpu-set-scroll-margins or set scroll margins
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42 ;; tpu-set-cursor-bound or set cursor bound
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43 ;; tpu-set-cursor-free or set cursor free
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44
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45 ;; Additionally, Gold-F toggles between bound and free cursor modes.
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46
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47 ;; Note that switching out of free cursor mode or exiting TPU-edt while in
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48 ;; free cursor mode strips trailing whitespace from every line in the file.
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49
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50
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51 ;;; Details:
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52
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53 ;; The functions contained in this file implement scroll margins and free
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54 ;; cursor mode. The following keys and commands are affected.
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55
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56 ;; key/command function scroll cursor
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57
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58 ;; Up-Arrow previous line x x
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59 ;; Down-Arrow next line x x
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60 ;; Right-Arrow next character x
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61 ;; Left-Arrow previous character x
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62 ;; KP0 next or previous line x
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63 ;; KP7 next or previous page x
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64 ;; KP8 next or previous screen x
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65 ;; KP2 next or previous end-of-line x x
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66 ;; Control-e current end-of-line x
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67 ;; Control-h previous beginning-of-line x
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68 ;; Next Scr next screen x
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69 ;; Prev Scr previous screen x
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70 ;; Search find a string x
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71 ;; Replace find and replace a string x
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72 ;; Newline insert a newline x
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73 ;; Paragraph next or previous paragraph x
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74 ;; Auto-Fill break lines on spaces x
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75
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76 ;; These functions are not part of the base TPU-edt for the following
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77 ;; reasons:
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78
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79 ;; Free cursor mode is implemented with the emacs picture-mode functions.
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80 ;; These functions support moving the cursor all over the screen, however,
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81 ;; when the cursor is moved past the end of a line, spaces or tabs are
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82 ;; appended to the line - even if no text is entered in that area. In
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83 ;; order for a free cursor mode to work exactly like TPU/edt, this trailing
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84 ;; whitespace needs to be dealt with in every function that might encounter
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85 ;; it. Such global changes are impractical, however, free cursor mode is
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86 ;; too valuable to abandon completely, so it has been implemented in those
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87 ;; functions where it serves best.
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88
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89 ;; The implementation of scroll margins adds overhead to previously
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90 ;; simple and often used commands. These commands are now responsible
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91 ;; for their normal operation and part of the display function. There
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92 ;; is a possibility that this display overhead could adversely affect the
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93 ;; performance of TPU-edt on slower computers. In order to support the
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94 ;; widest range of computers, scroll margin support is optional.
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95
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96 ;; It's actually not known whether the overhead associated with scroll
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97 ;; margin support is significant. If you find that it is, please send
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98 ;; a note describing the extent of the performance degradation. Be sure
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99 ;; to include a description of the platform where you're running TPU-edt.
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100 ;; Send your note to the address provided by Gold-V.
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101
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102 ;; Even with these differences and limitations, these functions implement
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103 ;; important aspects of the real TPU/edt. Those who miss free cursor mode
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104 ;; and/or scroll margins will appreciate these implementations.
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105
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106 ;;; Code:
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107
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108
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109 ;;; Gotta have tpu-edt
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110
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111 (require 'tpu-edt)
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112
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113
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114 ;;; Customization variables
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115
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116 (defconst tpu-top-scroll-margin 0
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117 "*Scroll margin at the top of the screen.
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118 Interpreted as a percent of the current window size.")
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119 (defconst tpu-bottom-scroll-margin 0
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120 "*Scroll margin at the bottom of the screen.
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121 Interpreted as a percent of the current window size.")
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122
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123 (defvar tpu-backward-char-like-tpu t
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124 "*If non-nil, in free cursor mode backward-char (left-arrow) works
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125 just like TPU/edt. Otherwise, backward-char will move to the end of
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126 the previous line when starting from a line beginning.")
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127
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128
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129 ;;; Global variables
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130
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131 (defvar tpu-cursor-free nil
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132 "If non-nil, let the cursor roam free.")
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133
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134
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135 ;;; Hooks -- Set cursor free in picture mode.
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136 ;;; Clean up when writing a file from cursor free mode.
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137
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138 (add-hook 'picture-mode-hook 'tpu-set-cursor-free)
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139
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140 (defun tpu-write-file-hook nil
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141 "Eliminate whitespace at ends of lines, if the cursor is free."
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142 (if (and (buffer-modified-p) tpu-cursor-free) (picture-clean)))
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143
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144 (or (memq 'tpu-write-file-hook write-file-hooks)
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145 (setq write-file-hooks
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146 (cons 'tpu-write-file-hook write-file-hooks)))
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147
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148
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149 ;;; Utility routines for implementing scroll margins
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150
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151 (defun tpu-top-check (beg lines)
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152 "Enforce scroll margin at the top of screen."
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153 (let ((margin (/ (* (window-height) tpu-top-scroll-margin) 100)))
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154 (cond ((< beg margin) (recenter beg))
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155 ((< (- beg lines) margin) (recenter margin)))))
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156
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157 (defun tpu-bottom-check (beg lines)
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158 "Enforce scroll margin at the bottom of screen."
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159 (let* ((height (window-height))
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160 (margin (+ 1 (/ (* height tpu-bottom-scroll-margin) 100)))
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161 ;; subtract 1 from height because it includes mode line
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162 (difference (- height margin 1)))
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163 (cond ((> beg difference) (recenter beg))
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164 ((> (+ beg lines) difference) (recenter (- margin))))))
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165
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166
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167 ;;; Movement by character
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168
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169 (defun tpu-forward-char (num)
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170 "Move right ARG characters (left if ARG is negative)."
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171 (interactive "p")
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172 (setq zmacs-region-stays t)
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173 (if tpu-cursor-free (picture-forward-column num) (forward-char num)))
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174
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175 (defun tpu-backward-char (num)
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176 "Move left ARG characters (right if ARG is negative)."
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177 (interactive "p")
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178 (setq zmacs-region-stays t)
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179 (cond ((not tpu-cursor-free)
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180 (backward-char num))
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181 (tpu-backward-char-like-tpu
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182 (picture-backward-column num))
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183 ((bolp)
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184 (backward-char 1)
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185 (picture-end-of-line)
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186 (picture-backward-column (1- num)))
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187 (t
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188 (picture-backward-column num))))
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189
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190
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191 ;;; Movement by line
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192
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193 (defun tpu-next-line (num)
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194 "Move to next line.
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195 Prefix argument serves as a repeat count."
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196 (interactive "p")
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197 (setq zmacs-region-stays t)
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198 (let ((beg (tpu-current-line)))
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199 (if tpu-cursor-free (or (eobp) (picture-move-down num))
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200 (next-line-internal num))
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201 (tpu-bottom-check beg num)
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202 (setq this-command 'next-line)))
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203
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204 (defun tpu-previous-line (num)
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205 "Move to previous line.
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206 Prefix argument serves as a repeat count."
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207 (interactive "p")
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208 (setq zmacs-region-stays t)
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209 (let ((beg (tpu-current-line)))
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210 (if tpu-cursor-free (picture-move-up num) (next-line-internal (- num)))
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211 (tpu-top-check beg num)
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212 (setq this-command 'previous-line)))
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213
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214 (defun tpu-next-beginning-of-line (num)
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215 "Move to beginning of line; if at beginning, move to beginning of next line.
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216 Accepts a prefix argument for the number of lines to move."
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217 (interactive "p")
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218 (setq zmacs-region-stays t)
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219 (let ((beg (tpu-current-line)))
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220 (backward-char 1)
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221 (forward-line (- 1 num))
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222 (tpu-top-check beg num)))
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223
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224 (defun tpu-next-end-of-line (num)
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225 "Move to end of line; if at end, move to end of next line.
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226 Accepts a prefix argument for the number of lines to move."
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227 (interactive "p")
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228 (setq zmacs-region-stays t)
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229 (let ((beg (tpu-current-line)))
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230 (cond (tpu-cursor-free
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231 (let ((beg (point)))
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232 (if (< 1 num) (forward-line num))
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233 (picture-end-of-line)
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234 (if (<= (point) beg) (progn (forward-line) (picture-end-of-line)))))
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235 (t
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236 (forward-char)
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237 (end-of-line num)))
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238 (tpu-bottom-check beg num)))
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239
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240 (defun tpu-previous-end-of-line (num)
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241 "Move EOL upward.
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242 Accepts a prefix argument for the number of lines to move."
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243 (interactive "p")
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244 (setq zmacs-region-stays t)
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245 (let ((beg (tpu-current-line)))
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246 (cond (tpu-cursor-free
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247 (picture-end-of-line (- 1 num)))
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248 (t
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249 (end-of-line (- 1 num))))
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250 (tpu-top-check beg num)))
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251
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252 (defun tpu-current-end-of-line nil
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253 "Move point to end of current line."
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254 (interactive)
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255 (setq zmacs-region-stays t)
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256 (let ((beg (point)))
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257 (if tpu-cursor-free (picture-end-of-line) (end-of-line))
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258 (if (= beg (point)) (message "You are already at the end of a line."))))
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259
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260 (defun tpu-forward-line (num)
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261 "Move to beginning of next line.
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262 Prefix argument serves as a repeat count."
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263 (interactive "p")
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264 (let ((beg (tpu-current-line)))
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265 (next-line-internal num)
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266 (tpu-bottom-check beg num)
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267 (beginning-of-line)))
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268
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269 (defun tpu-backward-line (num)
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270 "Move to beginning of previous line.
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271 Prefix argument serves as repeat count."
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272 (interactive "p")
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273 (setq zmacs-region-stays t)
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274 (let ((beg (tpu-current-line)))
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275 (or (bolp) (>= 0 num) (setq num (- num 1)))
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276 (next-line-internal (- num))
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277 (tpu-top-check beg num)
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278 (beginning-of-line)))
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279
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280
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281 ;;; Movement by paragraph
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282
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283 (defun tpu-paragraph (num)
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284 "Move to the next paragraph in the current direction.
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285 A repeat count means move that many paragraphs."
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286 (interactive "p")
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287 (setq zmacs-region-stays t)
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288 (let* ((left nil)
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289 (beg (tpu-current-line))
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290 (height (window-height))
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291 (top-percent
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292 (if (= 0 tpu-top-scroll-margin) 10 tpu-top-scroll-margin))
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293 (bottom-percent
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294 (if (= 0 tpu-bottom-scroll-margin) 15 tpu-bottom-scroll-margin))
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295 (top-margin (/ (* height top-percent) 100))
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296 (bottom-up-margin (+ 1 (/ (* height bottom-percent) 100)))
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297 (bottom-margin (max beg (- height bottom-up-margin 1)))
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298 (top (save-excursion (move-to-window-line top-margin) (point)))
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299 (bottom (save-excursion (move-to-window-line bottom-margin) (point)))
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300 (far (save-excursion
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301 (goto-char bottom) (forward-line (- height 2)) (point))))
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302 (cond (tpu-advance
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303 (tpu-next-paragraph num)
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304 (cond((> (point) far)
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305 (setq left (save-excursion (forward-line height)))
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306 (if (= 0 left) (recenter top-margin)
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307 (recenter (- left bottom-up-margin))))
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308 (t
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309 (and (> (point) bottom) (recenter bottom-margin)))))
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310 (t
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311 (tpu-previous-paragraph num)
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312 (and (< (point) top) (recenter (min beg top-margin)))))))
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313
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314
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315 ;;; Movement by page
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316
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317 (defun tpu-page (num)
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318 "Move to the next page in the current direction.
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319 A repeat count means move that many pages."
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320 (interactive "p")
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321 (setq zmacs-region-stays t)
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322 (let* ((left nil)
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323 (beg (tpu-current-line))
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324 (height (window-height))
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325 (top-percent
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326 (if (= 0 tpu-top-scroll-margin) 10 tpu-top-scroll-margin))
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327 (bottom-percent
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328 (if (= 0 tpu-bottom-scroll-margin) 15 tpu-bottom-scroll-margin))
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329 (top-margin (/ (* height top-percent) 100))
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330 (bottom-up-margin (+ 1 (/ (* height bottom-percent) 100)))
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331 (bottom-margin (max beg (- height bottom-up-margin 1)))
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332 (top (save-excursion (move-to-window-line top-margin) (point)))
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333 (bottom (save-excursion (move-to-window-line bottom-margin) (point)))
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334 (far (save-excursion
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335 (goto-char bottom) (forward-line (- height 2)) (point))))
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336 (cond (tpu-advance
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337 (forward-page num)
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338 (cond((> (point) far)
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339 (setq left (save-excursion (forward-line height)))
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340 (if (= 0 left) (recenter top-margin)
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341 (recenter (- left bottom-up-margin))))
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342 (t
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343 (and (> (point) bottom) (recenter bottom-margin)))))
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344 (t
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345 (backward-page num)
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346 (and (< (point) top) (recenter (min beg top-margin)))))))
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347
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348
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349 ;;; Scrolling
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350
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351 (defun tpu-scroll-window-down (num)
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352 "Scroll the display down to the next section.
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353 A repeat count means scroll that many sections."
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354 (interactive "p")
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355 (setq zmacs-region-stays t)
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356 (let* ((beg (tpu-current-line))
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357 (height (1- (window-height)))
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358 (lines (* num (/ (* height tpu-percent-scroll) 100))))
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359 (next-line-internal (- lines))
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360 (tpu-top-check beg lines)))
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361
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362 (defun tpu-scroll-window-up (num)
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363 "Scroll the display up to the next section.
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364 A repeat count means scroll that many sections."
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365 (interactive "p")
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366 (setq zmacs-region-stays t)
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367 (let* ((beg (tpu-current-line))
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368 (height (1- (window-height)))
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369 (lines (* num (/ (* height tpu-percent-scroll) 100))))
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370 (next-line-internal lines)
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371 (tpu-bottom-check beg lines)))
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372
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373
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374 ;;; Replace the TPU-edt internal search function
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375
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376 (defun tpu-search-internal (pat &optional quiet)
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377 "Search for a string or regular expression."
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378 (let* ((left nil)
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379 (beg (tpu-current-line))
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380 (height (window-height))
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381 (top-percent
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382 (if (= 0 tpu-top-scroll-margin) 10 tpu-top-scroll-margin))
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383 (bottom-percent
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384 (if (= 0 tpu-bottom-scroll-margin) 15 tpu-bottom-scroll-margin))
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385 (top-margin (/ (* height top-percent) 100))
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386 (bottom-up-margin (+ 1 (/ (* height bottom-percent) 100)))
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387 (bottom-margin (max beg (- height bottom-up-margin 1)))
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388 (top (save-excursion (move-to-window-line top-margin) (point)))
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389 (bottom (save-excursion (move-to-window-line bottom-margin) (point)))
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390 (far (save-excursion
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391 (goto-char bottom) (forward-line (- height 2)) (point))))
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392 (tpu-search-internal-core pat quiet)
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393 (if tpu-searching-forward
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394 (cond((> (point) far)
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395 (setq left (save-excursion (forward-line height)))
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396 (if (= 0 left) (recenter top-margin)
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397 (recenter (- left bottom-up-margin))))
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398 (t
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399 (and (> (point) bottom) (recenter bottom-margin))))
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400 (and (< (point) top) (recenter (min beg top-margin))))))
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401
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402
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403
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404 ;;; Replace the newline, newline-and-indent, and do-auto-fill functions
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405
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406 (or (fboundp 'tpu-old-newline)
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407 (fset 'tpu-old-newline (symbol-function 'newline)))
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408 (or (fboundp 'tpu-old-do-auto-fill)
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409 (fset 'tpu-old-do-auto-fill (symbol-function 'do-auto-fill)))
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410 (or (fboundp 'tpu-old-newline-and-indent)
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411 (fset 'tpu-old-newline-and-indent (symbol-function 'newline-and-indent)))
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412
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413 (defun newline (&optional num)
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414 "Insert a newline. With arg, insert that many newlines.
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415 In Auto Fill mode, can break the preceding line if no numeric arg.
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416 This is the TPU-edt version that respects the bottom scroll margin."
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417 (interactive "p")
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185
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418 (setq zmacs-region-stays t)
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0
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419 (let ((beg (tpu-current-line)))
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420 (or num (setq num 1))
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421 (tpu-old-newline num)
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422 (tpu-bottom-check beg num)))
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423
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424 (defun newline-and-indent nil
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425 "Insert a newline, then indent according to major mode.
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426 Indentation is done using the current indent-line-function.
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427 In programming language modes, this is the same as TAB.
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428 In some text modes, where TAB inserts a tab, this indents
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429 to the specified left-margin column. This is the TPU-edt
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430 version that respects the bottom scroll margin."
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431 (interactive)
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185
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432 (setq zmacs-region-stays t)
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0
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433 (let ((beg (tpu-current-line)))
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434 (tpu-old-newline-and-indent)
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435 (tpu-bottom-check beg 1)))
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436
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437 (defun do-auto-fill nil
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438 "TPU-edt version that respects the bottom scroll margin."
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439 (let ((beg (tpu-current-line)))
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440 (tpu-old-do-auto-fill)
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441 (tpu-bottom-check beg 1)))
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442
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443
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444 ;;; Function to set scroll margins
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445
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72
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446 ;;;###autoload
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0
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447 (defun tpu-set-scroll-margins (top bottom)
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448 "Set scroll margins."
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449 (interactive
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450 "sEnter top scroll margin (N lines or N%% or RETURN for current value): \
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451 \nsEnter bottom scroll margin (N lines or N%% or RETURN for current value): ")
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185
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452 (setq zmacs-region-stays t)
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0
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453 ;; set top scroll margin
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454 (or (string= top "")
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455 (if (string= "%" (substring top -1))
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456 (setq tpu-top-scroll-margin (string-to-int top))
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457 (setq tpu-top-scroll-margin
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458 (/ (1- (+ (* (string-to-int top) 100) (window-height)))
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459 (window-height)))))
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460 ;; set bottom scroll margin
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461 (or (string= bottom "")
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462 (if (string= "%" (substring bottom -1))
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463 (setq tpu-bottom-scroll-margin (string-to-int bottom))
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464 (setq tpu-bottom-scroll-margin
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465 (/ (1- (+ (* (string-to-int bottom) 100) (window-height)))
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466 (window-height)))))
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467 ;; report scroll margin settings if running interactively
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468 (and (interactive-p)
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469 (message "Scroll margins set. Top = %s%%, Bottom = %s%%"
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470 tpu-top-scroll-margin tpu-bottom-scroll-margin)))
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471
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472
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473 ;;; Functions to set cursor bound or free
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474
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72
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475 ;;;###autoload
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0
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476 (defun tpu-set-cursor-free nil
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477 "Allow the cursor to move freely about the screen."
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478 (interactive)
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185
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479 (setq zmacs-region-stays t)
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0
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480 (setq tpu-cursor-free t)
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481 (substitute-key-definition 'tpu-set-cursor-free
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482 'tpu-set-cursor-bound
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483 GOLD-map)
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484 (message "The cursor will now move freely about the screen."))
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485
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72
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486 ;;;###autoload
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0
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487 (defun tpu-set-cursor-bound nil
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488 "Constrain the cursor to the flow of the text."
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489 (interactive)
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185
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490 (setq zmacs-region-stays t)
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0
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491 (picture-clean)
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492 (setq tpu-cursor-free nil)
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493 (substitute-key-definition 'tpu-set-cursor-bound
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494 'tpu-set-cursor-free
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495 GOLD-map)
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496 (message "The cursor is now bound to the flow of your text."))
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497
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498 ;;; tpu-extras.el ends here
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