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1 ;;; view-less.el --- Minor mode for browsing files with keybindings like `less'
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2
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3 ;; Copyright (C) 1994, 1995 Tinker Systems and INS Engineering Corp.
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4
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5 ;; Author: Jonathan Stigelman
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6 ;; Keywords: wp unix
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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
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11 ;; it under the terms of the GNU General Public License as published by
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12 ;; the Free Software Foundation; either version 2 of the License, or
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13 ;; (at your option) any later version.
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14 ;;
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15 ;; XEmacs is distributed in the hope that it will be useful,
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16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 ;; GNU 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; if not, write to the Free Software
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22 ;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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23
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24 ;;; Synched up with: Not in FSF.
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25
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26 ;;; Commentary:
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27
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28 ;; This mode is for browsing files without changing them. Keybindings
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29 ;; similar to those used by the less(1) program are used.
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30 ;;
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31 ;; Originally written for v18 by David Gudeman (gudeman@arizona.edu)
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32 ;; Mods by Bengt Martensson, to closely resemble less (July 1987)
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33 ;;
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34 ;; If you would like all write-protected files to be visited in view-mode,
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35 ;; then add the following to your .emacs file:
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36 ;;
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37 ;; (add-hook 'find-file-hooks 'auto-view-mode)
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38
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39 ;;; Code:
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40
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41 (defvar view-search-string ""
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42 "Last string searched for with view-search functions.")
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43
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44 (defvar view-search-arg 1
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45 "Argument to last view search.")
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46
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47 (defvar view-default-lines 10
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48 "Default value for the \"d\" and \"u\" commands in view-mode")
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49
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50 (defvar view-minor-mode nil
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51 "Non-nil when view-mode is active. Call `view-mode' to toggle.")
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52 (make-variable-buffer-local 'view-minor-mode)
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53
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116
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54 ;;;###autoload
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55 (defvar view-minor-mode-map
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56 (let ((map (make-keymap)))
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57 (set-keymap-name map 'view-minor-mode-map)
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58 (suppress-keymap map)
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59 (define-key map "-" 'negative-argument)
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60 (define-key map " " 'scroll-up)
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61 (define-key map "f" 'scroll-up)
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62 (define-key map "b" 'scroll-down)
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63 (define-key map 'backspace 'scroll-down)
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159
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64 (define-key map 'delete 'scroll-down)
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65 (define-key map "\r" 'view-scroll-lines-up)
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66 (define-key map "\n" 'view-scroll-lines-up)
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67 (define-key map "e" 'view-scroll-lines-up)
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68 (define-key map "j" 'view-scroll-lines-up)
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69 (define-key map "y" 'view-scroll-lines-down)
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70 (define-key map "k" 'view-scroll-lines-down)
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71 (define-key map "d" 'view-scroll-some-lines-up)
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72 (define-key map "u" 'view-scroll-some-lines-down)
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73 (define-key map "r" 'recenter)
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74 (define-key map "t" 'toggle-truncate-lines)
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75 (define-key map "N" 'view-buffer)
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76 (define-key map "E" 'view-file)
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77 (define-key map "P" 'view-buffer)
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78 (define-key map "!" 'shell-command)
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79 (define-key map "|" 'shell-command-on-region)
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80 (define-key map "=" 'what-line)
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81 (define-key map "?" 'view-search-backward)
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82 (define-key map "h" 'view-mode-describe)
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83 (define-key map "s" 'view-repeat-search)
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84 (define-key map "n" 'view-repeat-search)
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85 (define-key map "/" 'view-search-forward)
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86 (define-key map "\\" 'view-search-backward)
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87 (define-key map "g" 'view-goto-line)
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88 (define-key map "G" 'view-last-windowful)
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89 (define-key map "%" 'view-goto-percent)
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90 (define-key map "p" 'view-goto-percent)
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91 (define-key map "m" 'point-to-register)
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92 (define-key map "'" 'register-to-point)
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93 (define-key map "C" 'view-cleanup-backspaces)
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94 (define-key map "\C-c\C-c" 'view-quit)
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95 ;; #### - should this use substitute-command-keys?
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96 (define-key map "\C-x\C-q" 'view-quit-toggle-ro)
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97 (define-key map "q" 'view-quit)
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98 map
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99 ))
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100
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101 (add-minor-mode 'view-minor-mode " View" view-minor-mode-map)
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102
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116
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103 ;;;###autoload
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104 (defvar view-mode-map
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105 (let ((map (copy-keymap view-minor-mode-map)))
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106 (set-keymap-name map 'view-mode-map)
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107 map))
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108
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109 ;;;###autoload
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110 (defun view-file (file &optional other-p)
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111 "Find FILE, enter view mode. With prefix arg OTHER-P, use other window."
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112 (interactive "fView File: \nP")
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113 (let ((old-p (get-file-buffer file))
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114 (obuf (current-buffer)))
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115 (if other-p
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116 (find-file-other-window file)
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117 (find-file file))
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118 (view-mode (if other-p nil obuf)
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119 (if old-p nil 'kill-buffer))
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120 nil))
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121
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122 ;;;###autoload
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123 (defun view-buffer (buf &optional other-p)
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124 "Switch to BUF, enter view mode. With prefix arg use other window."
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125 (interactive "bView Buffer: \nP")
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126 (let ((obuf (current-buffer)))
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127 (if other-p
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128 (switch-to-buffer-other-window buf)
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129 (switch-to-buffer buf))
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130 (view-mode (if other-p nil obuf) (if other-p nil 'bury-buffer))))
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131
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132 ;;;###autoload
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133 (defun view-file-other-window (file)
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134 "Find FILE in other window, and enter view mode."
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135 (interactive "fView File: ")
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136 (view-file file t))
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137
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138 ;;;###autoload
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139 (defun view-buffer-other-window (buffer)
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140 "Switch to BUFFER in another window, and enter view mode."
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141 (interactive "bView Buffer: ")
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142 (view-buffer buffer t))
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143
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144 (defun view-brief-help ()
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145 (message
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146 (substitute-command-keys
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147 "\\<view-minor-mode-map>\\[scroll-up] = page forward; \\[scroll-down] = page back; \
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148 \\[view-mode-describe] = help; \\[view-quit] = quit.")))
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149
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150 (defvar view-exit-position)
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151 (defvar view-prev-buffer)
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152 (defvar view-exit-action)
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153 (defvar view-old-buffer-read-only)
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154
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155 ;;;###autoload
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156 (defun view-minor-mode (&optional prev-buffer exit-action)
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157 "Minor mode for viewing text, with bindings like `less'.
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158 Commands are:
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159 \\<view-minor-mode-map>
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160 0..9 prefix args
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161 - prefix minus
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162 \\[scroll-up] page forward
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163 \\[scroll-down] page back
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164 \\[view-scroll-lines-up] scroll prefix-arg lines forward, default 1.
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165 \\[view-scroll-lines-down] scroll prefix-arg lines backward, default 1.
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166 \\[view-scroll-some-lines-down] scroll prefix-arg lines backward, default 10.
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167 \\[view-scroll-some-lines-up] scroll prefix-arg lines forward, default 10.
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168 \\[what-line] print line number
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169 \\[view-mode-describe] print this help message
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170 \\[view-search-forward] regexp search, uses previous string if you just hit RET
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171 \\[view-search-backward] as above but searches backward
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172 \\[view-repeat-search] repeat last search
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173 \\[view-goto-line] goto line prefix-arg, default 1
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174 \\[view-last-windowful] goto line prefix-arg, default last line
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175 \\[view-goto-percent] goto a position by percentage
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176 \\[toggle-truncate-lines] toggle truncate-lines
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177 \\[view-file] view another file
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178 \\[view-buffer] view another buffer
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179 \\[view-cleanup-backspaces] cleanup backspace constructions
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180 \\[shell-command] execute a shell command
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181 \\[shell-command-on-region]\
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182 execute a shell command with the region as input
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183 \\[view-quit] exit view-mode, and bury the current buffer.
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184
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185 If invoked with the optional (prefix) arg non-nil, view-mode cleans up
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186 backspace constructions.
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187
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188 More precisely:
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189 \\{view-minor-mode-map}"
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190 (interactive)
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191
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192 (make-local-variable 'view-default-lines)
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193 (set (make-local-variable 'view-exit-position) (point))
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194 (set (make-local-variable 'view-prev-buffer) prev-buffer)
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195 (set (make-local-variable 'view-exit-action) exit-action)
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196 (set (make-local-variable 'view-old-buffer-read-only) buffer-read-only)
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197 (add-hook (make-local-variable 'change-major-mode-hook)
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198 'view-fixup-read-only)
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199 (setq view-minor-mode t
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200 buffer-read-only t)
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201 (view-brief-help))
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202
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203 ;;;###autoload
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204 (defun view-mode (&optional prev-buffer exit-action clean-bs)
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205 "View the current buffer using view-minor-mode. This exists to be 99.9%
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206 compatible with the implementations of `view-mode' in view.el and older
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207 versions of view-less.el."
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208 (interactive (list nil 'bury-buffer current-prefix-arg))
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209 ;; #### - The first two arguments provide compatibility with view.el (and
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210 ;; thus FSFmacs), while the third argument as a prefix argument maintains
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211 ;; interactive compatibility with older versions of view-less. --Stig
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212 (if clean-bs (cleanup-backspaces))
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213 (view-minor-mode prev-buffer exit-action))
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214
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215 ;;;###autoload
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216 (defun view-major-mode (&optional prev-buffer exit-action clean-bs)
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217 "View the current buffer using view-mode, as a major mode.
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218 This function has a nonstandard name because `view-mode' is wrongly
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219 named but is like this for compatibility reasons."
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220 ;; #### - The first two arguments provide compatibility with view.el (and
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221 ;; thus FSFmacs), while the third argument as a prefix argument maintains
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222 ;; interactive compatibility with older versions of view-less. --Stig
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223 (interactive (list nil 'bury-buffer current-prefix-arg))
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224 (kill-all-local-variables)
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225 (use-local-map view-mode-map)
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226 (setq major-mode 'view-mode)
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227 (set (make-local-variable 'view-exit-position) (point))
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228 (set (make-local-variable 'view-prev-buffer) prev-buffer)
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229 (set (make-local-variable 'view-exit-action) exit-action)
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230 (set (make-local-variable 'view-old-buffer-read-only) buffer-read-only)
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231 (set (make-local-variable 'view-major-mode) t)
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232 (setq buffer-read-only t)
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233 (if clean-bs (cleanup-backspaces))
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234 (run-hooks 'view-mode-hook))
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235
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236 ;;;###autoload
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237 (defun auto-view-mode ()
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238 "If the file of the current buffer is not writable, call view-mode.
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239 This is meant to be added to `find-file-hooks'."
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240 (or (file-writable-p buffer-file-name)
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241 (view-minor-mode)))
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242
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243 (defun view-fixup-read-only ()
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244 ;; doing M-x normal mode should NOT leave the buffer read-only
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245 (and (boundp 'view-old-buffer-read-only)
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246 (progn (setq buffer-read-only view-old-buffer-read-only)
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247 (kill-local-variable 'view-old-buffer-read-only))))
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248
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249 (defun view-quit-toggle-ro ()
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250 "Exit view mode and execute the global binding of the key that invoked this
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251 command. Normally, this will toggle the state of `buffer-read-only', perhaps
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252 invoking some version-control mechanism."
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253 (interactive)
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254 (setq view-exit-position nil)
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255 ;; Kludge so this works as advertised. Stig, why can't you write
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256 ;; bug-free code???
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257 (let ((buffer-read-only buffer-read-only))
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258 (view-quit t))
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259 ;; no longer in view-minor-mode, so the keymap has changed...
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260 (call-interactively (key-binding (this-command-keys))))
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261
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262 (defun view-quit (&optional no-exit-action)
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263 "Exit view mode. With prefix argument, keep the current buffer selected."
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264 (interactive "P")
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265 (view-fixup-read-only)
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266 (setq view-minor-mode nil)
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267 (if view-exit-position (goto-char view-exit-position))
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268 (if (and (boundp 'view-major-mode) view-major-mode)
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269 (fundamental-mode)
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270 (let ((pbuf view-prev-buffer)
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271 (exitact view-exit-action))
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272 (if no-exit-action
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273 nil
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274 (if exitact (funcall exitact (current-buffer)))
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275 (if pbuf (switch-to-buffer pbuf))))))
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276
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277 ;; #### - similar to what's in man.el and this ought to be written in C anyway... --Stig
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278 (defun cleanup-backspaces ()
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279 "Cleanup backspace constructions.
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280 _^H and ^H_ sequences are deleted. x^Hx sequences are turned into x for all
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281 characters x. ^^H| and |^H^ sequences are turned into ^. +^Ho and o^H+ are
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282 turned into (+)."
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283 (interactive)
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284 (save-excursion
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285 (goto-char (point-min))
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286 (while (= (following-char) ?\C-h)
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287 (delete-char 1))
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288 (while (search-forward "\C-h" nil t)
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289 (forward-char -2)
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290 (cond ((looking-at "_\C-h\\|\\(.\\)\C-h\\1\\||\C-h\\^")
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291 (delete-char 2))
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292 ((looking-at ".\C-h_\\|\\^\C-h|")
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293 (forward-char 1)
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294 (delete-char 2))
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295 ((looking-at "+\C-ho\\|o\C-h+")
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296 (delete-char 3)
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297 (insert "(+)"))
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298 ((looking-at "|\C-h-")
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299 (delete-char 3)
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300 (insert "*"))
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301 (t (forward-char 2))))))
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302
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303 (defun view-cleanup-backspaces ()
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304 "Cleanup backspaces and if buffer is currently unmodified, don't flag it
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305 as a modified buffer. This works even if the buffer is read-only."
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306 (interactive)
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307 (let ((buffer-read-only)
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308 (buf-mod (buffer-modified-p)))
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309 (cleanup-backspaces)
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310 ;; #### - THIS IS PROBABLY A REALLY DANGEROUS THING TO DO IN A MINOR MODE!!
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311 (set-buffer-modified-p buf-mod)))
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312
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313 (defun toggle-truncate-lines (&optional p)
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314 "Toggles the values of truncate-lines.
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315 Positive prefix arg sets, negative disables."
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316 (interactive "P")
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317 (setq truncate-lines (if p
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318 (> (prefix-numeric-value p) 0)
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319 (not truncate-lines)))
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320 (recenter))
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321
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322 (defun view-scroll-lines-up (p)
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323 "Scroll up prefix-arg lines, default 1."
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324 (interactive "p")
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325 (scroll-up p))
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326
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327 (defun view-scroll-lines-down (p)
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328 "Scroll down prefix-arg lines, default 1."
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329 (interactive "p")
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330 (scroll-up (- p)))
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331
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332 (defun view-scroll-some-lines-down (&optional n)
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333 "Scroll down prefix-arg lines, default 10, or last argument."
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334 (interactive "p")
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335 (if (> n 1) (setq view-default-lines n))
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336 (scroll-down view-default-lines))
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337
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338 (defun view-scroll-some-lines-up (&optional n)
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339 "Scroll up prefix-arg lines, default 10, or last argument."
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340 (interactive "p")
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341 (if (> n 1) (setq view-default-lines n))
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342 (scroll-up view-default-lines))
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343
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344 (defun view-goto-line (&optional n)
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345 "Goto prefix arg line N. N = 1 by default.."
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346 (interactive "p")
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347 (goto-line n))
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348
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349 (defun view-last-windowful (&optional n)
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350 "Goto prefix arg line N or the first line of the last windowful in buffer."
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351 (interactive "p")
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352 (if current-prefix-arg
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353 (goto-line n)
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354 (end-of-buffer)
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355 (recenter -1)
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356 (move-to-window-line 0)))
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357
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358 (defun view-goto-percent (&optional percent)
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359 "Set mark and go to a position PERCENT way into the current buffer."
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360 (interactive "p")
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361 (set-mark-command nil)
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362 (goto-char (+ (point-min) (/ (* percent (- (point-max) (point-min))) 100)))
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363 (beginning-of-line))
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364
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365 (defun view-mode-describe ()
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366 (interactive)
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367 (let ((mode-name "View")
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368 (major-mode 'view-mode))
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369 (describe-mode)))
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370
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371 (defun view-search-forward (s p)
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372 "Search forward for REGEXP. If regexp is empty, use last search string.
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373 With prefix ARG, search forward that many occurrences."
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374 (interactive "sView search: \np")
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375 (unwind-protect
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376 (re-search-forward
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377 (if (string-equal "" s) view-search-string s) nil nil p)
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378 (setq view-search-arg p)
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379 (or (string-equal "" s)
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380 (setq view-search-string s))))
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381
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382 (defun view-search-backward (s p)
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383 "Search backward for REGEXP. If regexp is empty, use last search string.
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384 With prefix ARG, search forward that many occurrences."
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385 (interactive "sView search backward: \np")
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386 (view-search-forward s (- p)))
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387
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388 (defun view-repeat-search (p)
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389 "Repeat last view search command. If a prefix arg is given, use that
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390 instead of the previous arg, if the prefix is just a -, then take the
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391 negative of the last prefix arg."
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392 (interactive "P")
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393 (view-search-forward
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394 view-search-string
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395 (cond ((null p) view-search-arg)
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396 ((eq p '-) (- view-search-arg))
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397 (t (prefix-numeric-value p)))))
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398
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399 (provide 'view)
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400 (provide 'view-less)
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