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1 ;;; tpu-extras.el --- Scroll margins and free cursor mode for TPU-edt
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2
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3 ;; Copyright (C) 1993 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
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11 ;; XEmacs is free software; you can redistribute it and/or modify it
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12 ;; under the terms of the GNU General Public License as published by
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13 ;; the Free Software Foundation; either version 2, or (at your option)
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14 ;; any later version.
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15
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16 ;; XEmacs is distributed in the hope that it will be useful, but
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17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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19 ;; General Public License for more details.
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20
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21 ;; You should have received a copy of the GNU General Public License
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22 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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23 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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24
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25 ;;; Commentary:
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26
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27 ;; The functions contained in this file implement scroll margins and free
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28 ;; cursor mode. The following keys and commands are affected.
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29
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30 ;; key/command function scroll cursor
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31
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32 ;; Up-Arrow previous line x x
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33 ;; Down-Arrow next line x x
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34 ;; Right-Arrow next character x
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35 ;; Left-Arrow previous character x
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36 ;; KP0 next or previous line x
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37 ;; KP7 next or previous page x
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38 ;; KP8 next or previous screen x
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39 ;; KP2 next or previous end-of-line x x
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40 ;; Control-e current end-of-line x
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41 ;; Control-h previous beginning-of-line x
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42 ;; Next Scr next screen x
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43 ;; Prev Scr previous screen x
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44 ;; Search find a string x
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45 ;; Replace find and replace a string x
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46 ;; Newline insert a newline x
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47 ;; Paragraph next or previous paragraph x
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48 ;; Auto-Fill break lines on spaces x
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49
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50 ;; These functions are not part of the base TPU-edt for the following
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51 ;; reasons:
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52
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53 ;; Free cursor mode is implemented with the emacs picture-mode functions.
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54 ;; These functions support moving the cursor all over the screen, however,
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55 ;; when the cursor is moved past the end of a line, spaces or tabs are
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56 ;; appended to the line - even if no text is entered in that area. In
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57 ;; order for a free cursor mode to work exactly like TPU/edt, this trailing
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58 ;; whitespace needs to be dealt with in every function that might encounter
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59 ;; it. Such global changes are impractical, however, free cursor mode is
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60 ;; too valuable to abandon completely, so it has been implemented in those
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61 ;; functions where it serves best.
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62
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63 ;; The implementation of scroll margins adds overhead to previously
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64 ;; simple and often used commands. These commands are now responsible
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65 ;; for their normal operation and part of the display function. There
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66 ;; is a possibility that this display overhead could adversely affect the
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67 ;; performance of TPU-edt on slower computers. In order to support the
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68 ;; widest range of computers, scroll margin support is optional.
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69
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70 ;; I don't know for a fact that the overhead associated with scroll
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71 ;; margin support is significant. If you find that it is, please send me
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72 ;; a note describing the extent of the performance degradation. Be sure
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73 ;; to include a description of the platform where you're running TPU-edt.
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74 ;; Send your note to the address provided by Gold-V.
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75
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76 ;; Even with these differences and limitations, these functions implement
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77 ;; important aspects of the real TPU/edt. Those who miss free cursor mode
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78 ;; and/or scroll margins will appreciate these implementations.
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79
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80 ;;; Usage:
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81
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82 ;; To use this file, simply load it after loading TPU-edt. After that,
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83 ;; customize TPU-edt to your tastes by setting scroll margins and/or
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84 ;; turning on free cursor mode. Here's an example for your .emacs file.
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85
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86 ;; (load "tpu-edt") ; Load the base TPU-edt
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87 ;; (load "tpu-extras") ; and the extras.
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88 ;; (tpu-set-scroll-margins "10%" "15%") ; Set scroll margins.
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89
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90 ;; Once the extras are loaded, scroll margins and cursor binding can be
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91 ;; changed with the following commands:
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92
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93 ;; tpu-set-scroll-margins or set scroll margins
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94 ;; tpu-set-cursor-bound or set cursor bound
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95 ;; tpu-set-cursor-free or set cursor free
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96
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97 ;; Additionally, Gold-F toggles between bound and free cursor modes.
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98
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99 ;; Note that switching out of free cursor mode or exiting TPU-edt while in
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100 ;; free cursor mode strips trailing whitespace from every line in the file.
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101
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102 ;;; Code:
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103
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104
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105 ;;; Revision Information
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106
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107 (defconst tpu-extras-revision "!Revision: 1.6 !"
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108 "Revision number of the TPU-edt extras.")
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109
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110
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111 ;;; Customization variables
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112
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113 (defconst tpu-top-scroll-margin 0
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114 "*Scroll margin at the top of the screen.
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115 Interpreted as a percent of the current window size.")
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116 (defconst tpu-bottom-scroll-margin 0
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117 "*Scroll margin at the bottom of the screen.
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118 Interpreted as a percent of the current window size.")
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119
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120 (defvar tpu-backward-char-like-tpu t
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121 "*If non-nil, in free cursor mode backward-char (left-arrow) works
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122 just like TPU/edt. Otherwise, backward-char will move to the end of
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123 the previous line when starting from a line beginning.")
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124
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125
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126 ;;; Global variables
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127
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128 (defvar tpu-cursor-free nil
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129 "If non-nil, let the cursor roam free.")
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130
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131
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132 ;;; Hooks -- Set cursor free in picture mode.
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133 ;;; Clean up when writing a file from cursor free mode.
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134
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135 (if tpu-gnu-emacs18-p
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136 (or (memq 'tpu-set-cursor-free edit-picture-hook)
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137 (setq edit-picture-hook
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138 (cons 'tpu-set-cursor-free edit-picture-hook)))
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139 (add-hook 'picture-mode-hook 'tpu-set-cursor-free))
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140
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141 (defun tpu-write-file-hook nil
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142 "Eliminate whitespace at ends of lines, if the cursor is free."
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143 (if (and (buffer-modified-p) tpu-cursor-free) (picture-clean)))
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144
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145 (or (memq 'tpu-write-file-hook write-file-hooks)
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146 (setq write-file-hooks
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147 (cons 'tpu-write-file-hook write-file-hooks)))
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148
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149
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150 ;;; Utility routines for implementing scroll margins
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151
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152 (defun tpu-top-check (beg lines)
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153 "Enforce scroll margin at the top of screen."
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154 (let ((margin (/ (* (window-height) tpu-top-scroll-margin) 100)))
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155 (cond ((< beg margin) (recenter beg))
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156 ((< (- beg lines) margin) (recenter margin)))))
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157
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158 (defun tpu-bottom-check (beg lines)
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159 "Enforce scroll margin at the bottom of screen."
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160 (let* ((height (window-height))
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161 (margin (+ 1 (/ (* height tpu-bottom-scroll-margin) 100)))
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162 ;; subtract 1 from height because it includes mode line
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163 (difference (- height margin 1)))
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164 (cond ((> beg difference) (recenter beg))
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165 ((> (+ beg lines) difference) (recenter (- margin))))))
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166
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167
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168 ;;; Movement by character
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169
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170 (defun tpu-forward-char (num)
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171 "Move right ARG characters (left if ARG is negative)."
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172 (interactive "p")
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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 (cond ((not tpu-cursor-free)
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179 (backward-char num))
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180 (tpu-backward-char-like-tpu
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181 (picture-backward-column num))
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182 ((bolp)
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183 (backward-char 1)
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184 (picture-end-of-line)
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185 (picture-backward-column (1- num)))
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186 (t
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187 (picture-backward-column num))))
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188
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189
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190 ;;; Movement by line
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191
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192 (defun tpu-next-line (num)
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193 "Move to next line.
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194 Prefix argument serves as a repeat count."
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195 (interactive "p")
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196 (let ((beg (tpu-current-line)))
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197 (if tpu-cursor-free (or (eobp) (picture-move-down num))
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198 (next-line-internal num))
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199 (tpu-bottom-check beg num)
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200 (setq this-command 'next-line)))
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201
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202 (defun tpu-previous-line (num)
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203 "Move to previous line.
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204 Prefix argument serves as a repeat count."
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205 (interactive "p")
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206 (let ((beg (tpu-current-line)))
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207 (if tpu-cursor-free (picture-move-up num) (next-line-internal (- num)))
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208 (tpu-top-check beg num)
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209 (setq this-command 'previous-line)))
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210
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211 (defun tpu-next-beginning-of-line (num)
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212 "Move to beginning of line; if at beginning, move to beginning of next line.
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213 Accepts a prefix argument for the number of lines to move."
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214 (interactive "p")
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215 (let ((beg (tpu-current-line)))
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216 (backward-char 1)
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217 (forward-line (- 1 num))
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218 (tpu-top-check beg num)))
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219
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220 (defun tpu-next-end-of-line (num)
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221 "Move to end of line; if at end, move to end of next line.
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222 Accepts a prefix argument for the number of lines to move."
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223 (interactive "p")
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224 (let ((beg (tpu-current-line)))
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225 (cond (tpu-cursor-free
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226 (let ((beg (point)))
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227 (if (< 1 num) (forward-line num))
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228 (picture-end-of-line)
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229 (if (<= (point) beg) (progn (forward-line) (picture-end-of-line)))))
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230 (t
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231 (forward-char)
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232 (end-of-line num)))
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233 (tpu-bottom-check beg num)))
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234
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235 (defun tpu-previous-end-of-line (num)
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236 "Move EOL upward.
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237 Accepts a prefix argument for the number of lines to move."
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238 (interactive "p")
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239 (let ((beg (tpu-current-line)))
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240 (cond (tpu-cursor-free
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241 (picture-end-of-line (- 1 num)))
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242 (t
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243 (end-of-line (- 1 num))))
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244 (tpu-top-check beg num)))
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245
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246 (defun tpu-current-end-of-line nil
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247 "Move point to end of current line."
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248 (interactive)
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249 (let ((beg (point)))
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250 (if tpu-cursor-free (picture-end-of-line) (end-of-line))
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251 (if (= beg (point)) (message "You are already at the end of a line."))))
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252
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253 (defun tpu-forward-line (num)
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254 "Move to beginning of next line.
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255 Prefix argument serves as a repeat count."
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256 (interactive "p")
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257 (let ((beg (tpu-current-line)))
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258 (next-line-internal num)
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259 (tpu-bottom-check beg num)
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260 (beginning-of-line)))
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261
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262 (defun tpu-backward-line (num)
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263 "Move to beginning of previous line.
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264 Prefix argument serves as repeat count."
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265 (interactive "p")
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266 (let ((beg (tpu-current-line)))
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267 (next-line-internal (- num))
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268 (tpu-top-check beg num)
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269 (beginning-of-line)))
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270
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271
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272 ;;; Movement by paragraph
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273
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274 (defun tpu-paragraph (num)
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275 "Move to the next paragraph in the current direction.
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276 A repeat count means move that many paragraphs."
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277 (interactive "p")
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278 (let* ((left nil)
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279 (beg (tpu-current-line))
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280 (height (window-height))
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281 (top-percent
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282 (if (= 0 tpu-top-scroll-margin) 10 tpu-top-scroll-margin))
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283 (bottom-percent
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284 (if (= 0 tpu-bottom-scroll-margin) 15 tpu-bottom-scroll-margin))
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285 (top-margin (/ (* height top-percent) 100))
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286 (bottom-up-margin (+ 1 (/ (* height bottom-percent) 100)))
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287 (bottom-margin (max beg (- height bottom-up-margin 1)))
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288 (top (save-excursion (move-to-window-line top-margin) (point)))
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289 (bottom (save-excursion (move-to-window-line bottom-margin) (point)))
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290 (far (save-excursion
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291 (goto-char bottom) (forward-line (- height 2)) (point))))
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292 (cond (tpu-advance
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293 (tpu-next-paragraph num)
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294 (cond((> (point) far)
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295 (setq left (save-excursion (forward-line height)))
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296 (if (= 0 left) (recenter top-margin)
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297 (recenter (- left bottom-up-margin))))
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298 (t
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299 (and (> (point) bottom) (recenter bottom-margin)))))
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300 (t
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301 (tpu-previous-paragraph num)
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302 (and (< (point) top) (recenter (min beg top-margin)))))))
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303
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304
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305 ;;; Movement by page
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306
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307 (defun tpu-page (num)
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308 "Move to the next page in the current direction.
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309 A repeat count means move that many pages."
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310 (interactive "p")
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311 (let* ((left nil)
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312 (beg (tpu-current-line))
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313 (height (window-height))
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314 (top-percent
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315 (if (= 0 tpu-top-scroll-margin) 10 tpu-top-scroll-margin))
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316 (bottom-percent
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317 (if (= 0 tpu-bottom-scroll-margin) 15 tpu-bottom-scroll-margin))
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318 (top-margin (/ (* height top-percent) 100))
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319 (bottom-up-margin (+ 1 (/ (* height bottom-percent) 100)))
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320 (bottom-margin (max beg (- height bottom-up-margin 1)))
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321 (top (save-excursion (move-to-window-line top-margin) (point)))
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322 (bottom (save-excursion (move-to-window-line bottom-margin) (point)))
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323 (far (save-excursion
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324 (goto-char bottom) (forward-line (- height 2)) (point))))
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325 (cond (tpu-advance
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326 (forward-page num)
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327 (cond((> (point) far)
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328 (setq left (save-excursion (forward-line height)))
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329 (if (= 0 left) (recenter top-margin)
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330 (recenter (- left bottom-up-margin))))
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331 (t
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332 (and (> (point) bottom) (recenter bottom-margin)))))
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333 (t
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334 (backward-page num)
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335 (and (< (point) top) (recenter (min beg top-margin)))))))
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336
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337
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338 ;;; Scrolling
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339
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340 (defun tpu-scroll-window-down (num)
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341 "Scroll the display down to the next section.
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342 A repeat count means scroll that many sections."
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343 (interactive "p")
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344 (let* ((beg (tpu-current-line))
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345 (height (1- (window-height)))
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346 (lines (* num (/ (* height tpu-percent-scroll) 100))))
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347 (next-line-internal (- lines))
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348 (tpu-top-check beg lines)))
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349
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350 (defun tpu-scroll-window-up (num)
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351 "Scroll the display up to the next section.
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352 A repeat count means scroll that many sections."
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353 (interactive "p")
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354 (let* ((beg (tpu-current-line))
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355 (height (1- (window-height)))
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356 (lines (* num (/ (* height tpu-percent-scroll) 100))))
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357 (next-line-internal lines)
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358 (tpu-bottom-check beg lines)))
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359
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360
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361 ;;; Replace the TPU-edt internal search function
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362
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363 (defun tpu-search-internal (pat &optional quiet)
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364 "Search for a string or regular expression."
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365 (let* ((left nil)
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366 (beg (tpu-current-line))
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367 (height (window-height))
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368 (top-percent
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369 (if (= 0 tpu-top-scroll-margin) 10 tpu-top-scroll-margin))
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370 (bottom-percent
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371 (if (= 0 tpu-bottom-scroll-margin) 15 tpu-bottom-scroll-margin))
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372 (top-margin (/ (* height top-percent) 100))
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373 (bottom-up-margin (+ 1 (/ (* height bottom-percent) 100)))
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374 (bottom-margin (max beg (- height bottom-up-margin 1)))
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375 (top (save-excursion (move-to-window-line top-margin) (point)))
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376 (bottom (save-excursion (move-to-window-line bottom-margin) (point)))
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377 (far (save-excursion
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378 (goto-char bottom) (forward-line (- height 2)) (point))))
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379 (tpu-search-internal-core pat quiet)
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380 (if tpu-searching-forward
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381 (cond((> (point) far)
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382 (setq left (save-excursion (forward-line height)))
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383 (if (= 0 left) (recenter top-margin)
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384 (recenter (- left bottom-up-margin))))
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385 (t
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386 (and (> (point) bottom) (recenter bottom-margin))))
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387 (and (< (point) top) (recenter (min beg top-margin))))))
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388
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389
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390
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391 ;;; Replace the newline, newline-and-indent, and do-auto-fill functions
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392
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393 (or (fboundp 'tpu-old-newline)
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394 (fset 'tpu-old-newline (symbol-function 'newline)))
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395 (or (fboundp 'tpu-old-do-auto-fill)
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396 (fset 'tpu-old-do-auto-fill (symbol-function 'do-auto-fill)))
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397 (or (fboundp 'tpu-old-newline-and-indent)
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398 (fset 'tpu-old-newline-and-indent (symbol-function 'newline-and-indent)))
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399
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400 (defun newline (&optional num)
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401 "Insert a newline. With arg, insert that many newlines.
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402 In Auto Fill mode, can break the preceding line if no numeric arg.
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403 This is the TPU-edt version that respects the bottom scroll margin."
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404 (interactive "p")
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405 (let ((beg (tpu-current-line)))
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406 (or num (setq num 1))
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407 (tpu-old-newline num)
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408 (tpu-bottom-check beg num)))
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409
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410 (defun newline-and-indent nil
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411 "Insert a newline, then indent according to major mode.
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412 Indentation is done using the current indent-line-function.
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413 In programming language modes, this is the same as TAB.
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414 In some text modes, where TAB inserts a tab, this indents
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415 to the specified left-margin column. This is the TPU-edt
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416 version that respects the bottom scroll margin."
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417 (interactive)
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418 (let ((beg (tpu-current-line)))
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419 (tpu-old-newline-and-indent)
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420 (tpu-bottom-check beg 1)))
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421
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422 (defun do-auto-fill nil
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423 "TPU-edt version that respects the bottom scroll margin."
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424 (let ((beg (tpu-current-line)))
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425 (tpu-old-do-auto-fill)
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426 (tpu-bottom-check beg 1)))
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427
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428
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429 ;;; Function to set scroll margins
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430
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431 ;;;jwz: don't autoload this by default ###autoload
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432 (defun tpu-set-scroll-margins (top bottom)
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433 "Set scroll margins."
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434 (interactive
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435 "sEnter top scroll margin (N lines or N%% or RETURN for current value): \
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436 \nsEnter bottom scroll margin (N lines or N%% or RETURN for current value): ")
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437 ;; set top scroll margin
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438 (or (string= top "")
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439 (if (string= "%" (substring top -1))
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440 (setq tpu-top-scroll-margin (string-to-int top))
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441 (setq tpu-top-scroll-margin
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442 (/ (1- (+ (* (string-to-int top) 100) (window-height)))
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443 (window-height)))))
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444 ;; set bottom scroll margin
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445 (or (string= bottom "")
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446 (if (string= "%" (substring bottom -1))
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447 (setq tpu-bottom-scroll-margin (string-to-int bottom))
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448 (setq tpu-bottom-scroll-margin
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449 (/ (1- (+ (* (string-to-int bottom) 100) (window-height)))
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450 (window-height)))))
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451 ;; report scroll margin settings if running interactively
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452 (and (interactive-p)
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453 (message "Scroll margins set. Top = %s%%, Bottom = %s%%"
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454 tpu-top-scroll-margin tpu-bottom-scroll-margin)))
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455
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456
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457 ;;; Functions to set cursor bound or free
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458
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459 ;;;jwz: don't autoload this by default ###autoload
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460 (defun tpu-set-cursor-free nil
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461 "Allow the cursor to move freely about the screen."
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462 (interactive)
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463 (setq tpu-cursor-free t)
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464 (substitute-key-definition 'tpu-set-cursor-free
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465 'tpu-set-cursor-bound
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466 GOLD-map)
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467 (message "The cursor will now move freely about the screen."))
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468
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469 ;;;jwz: don't autoload this by default ###autoload
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470 (defun tpu-set-cursor-bound nil
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471 "Constrain the cursor to the flow of the text."
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472 (interactive)
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473 (picture-clean)
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474 (setq tpu-cursor-free nil)
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475 (substitute-key-definition 'tpu-set-cursor-bound
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476 'tpu-set-cursor-free
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477 GOLD-map)
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478 (message "The cursor is now bound to the flow of your text."))
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479
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480 ;;; tpu-extras.el ends here
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