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1 ;; Decorate a shell buffer with fonts.
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2 ;; Copyright (C) 1992, 1993, 1994 Free Software Foundation, Inc.
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3
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4 ;; This file is part of XEmacs.
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5
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6 ;; XEmacs is free software; you can redistribute it and/or modify it
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7 ;; under the terms of the GNU General Public License as published by
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8 ;; the Free Software Foundation; either version 2, or (at your option)
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9 ;; any later version.
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10
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11 ;; XEmacs is distributed in the hope that it will be useful, but
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12 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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13 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 ;; General Public License for more details.
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15
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16 ;; You should have received a copy of the GNU General Public License
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17 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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18 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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19
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20 ;;; Synched up with: Not in FSF.
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21
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22 ;; Do this: (add-hook 'shell-mode-hook 'install-shell-fonts)
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23 ;; and the prompt in your shell-buffers will appear bold-italic, process
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24 ;; output will appear in normal face, and typein will appear in bold.
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25 ;;
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26 ;; The faces shell-prompt, shell-input and shell-output can be modified
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27 ;; as desired, for example, (copy-face 'italic 'shell-prompt).
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28
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29 ;; Written by Jamie Zawinski, overhauled by Eric Benson.
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30
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31 ;; TODO:
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32 ;; =====
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33 ;; Parse ANSI/VT100 escape sequences to turn on underlining/boldface/etc.
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34 ;; Automatically run nuke-nroff-bs?
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35
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36
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37 (require 'text-props) ; for put-nonduplicable-text-property
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38
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39 (make-face 'shell-prompt)
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40 (if (not (face-differs-from-default-p 'shell-prompt))
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41 (copy-face 'bold-italic 'shell-prompt))
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42
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43 (make-face 'shell-input)
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44 (if (not (face-differs-from-default-p 'shell-input))
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45 (copy-face 'bold 'shell-input))
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46
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47 (make-face 'shell-output)
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48 (if (not (face-differs-from-default-p 'shell-output))
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49 (progn (make-face-unbold 'shell-output)
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50 (make-face-unitalic 'shell-output)
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51 (set-face-underline-p 'shell-output nil)))
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52
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53 (defvar shell-font-read-only-prompt nil
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54 "*Set all shell prompts to be read-only")
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55
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56 (defvar shell-font-current-face 'shell-input)
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57
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58 (defun shell-font-fontify-region (start end delete-count)
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59 ;; for use as an element of after-change-functions; fontifies the inserted text.
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60 (if (= start end)
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61 nil
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62 ; ;; This creates lots of extents (one per user-typed character)
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63 ; ;; which is wasteful of memory.
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64 ; (let ((e (make-extent start end)))
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65 ; (set-extent-face e shell-font-current-face)
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66 ; (set-extent-property e 'shell-font t))
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67
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68 ;; This efficiently merges extents
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69 (put-nonduplicable-text-property start end 'face shell-font-current-face)
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70 (and shell-font-read-only-prompt
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71 (eq shell-font-current-face 'shell-prompt)
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72 (put-nonduplicable-text-property start end 'read-only t))
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73 ))
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74
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75 (defun shell-font-hack-prompt (limit)
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76 "Search backward from point-max for text matching the comint-prompt-regexp,
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77 and put it in the `shell-prompt' face. LIMIT is the left bound of the search."
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78 (save-excursion
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79 (goto-char (point-max))
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80 (save-match-data
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81 (cond ((re-search-backward comint-prompt-regexp limit t)
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82 (goto-char (match-end 0))
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83 (cond ((= (point) (point-max))
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84 (skip-chars-backward " \t")
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85 (let ((shell-font-current-face 'shell-prompt))
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86 (shell-font-fontify-region
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87 (match-beginning 0) (point) 0)))))))))
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88
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89
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90 (defvar shell-font-process-filter nil
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91 "In an interaction buffer with shell-font, this is the original proc filter.
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92 shell-font encapsulates this.")
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93
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94 (defun shell-font-process-filter (proc string)
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95 "Invoke the original process filter, then set fonts on the output.
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96 The original filter is in the buffer-local variable shell-font-process-filter."
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97 (let ((cb (current-buffer))
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98 (pb (process-buffer proc)))
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99 (if (null pb)
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100 ;; If the proc has no buffer, leave it alone.
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101 (funcall shell-font-process-filter proc string)
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102 ;; Don't do save excursion because some proc filters want to change
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103 ;; the buffer's point.
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104 (set-buffer pb)
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105 (let ((p (marker-position (process-mark proc))))
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106 (prog1
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107 ;; this let must not be around the `set-buffer' call.
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108 (let ((shell-font-current-face 'shell-output))
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109 (funcall shell-font-process-filter proc string))
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110 (shell-font-hack-prompt p)
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111 (set-buffer cb))))))
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112
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113 ;;;###autoload
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114 (defun install-shell-fonts ()
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115 "Decorate the current interaction buffer with fonts.
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116 This uses the faces called `shell-prompt', `shell-input' and `shell-output';
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117 you can alter the graphical attributes of those with the normal
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118 face-manipulation functions."
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119 (let* ((proc (or (get-buffer-process (current-buffer))
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120 (error "no process in %S" (current-buffer))))
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121 (old (or (process-filter proc)
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122 (error "no process filter on %S" proc))))
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123 (make-local-variable 'after-change-functions)
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124 (add-hook 'after-change-functions 'shell-font-fontify-region)
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125 (make-local-variable 'shell-font-current-face)
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126 (setq shell-font-current-face 'shell-input)
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127 (make-local-variable 'shell-font-process-filter)
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128 (or (eq old 'shell-font-process-filter) ; already set
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129 (setq shell-font-process-filter old))
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130 (set-process-filter proc 'shell-font-process-filter))
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131 nil)
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132
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133 (add-hook 'shell-mode-hook 'install-shell-fonts)
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134 (add-hook 'telnet-mode-hook 'install-shell-fonts)
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135 (add-hook 'gdb-mode-hook 'install-shell-fonts)
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136
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137 ;; for compatibility with the 19.8 version
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138 ;(fset 'install-shell-font-prompt 'install-shell-fonts)
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139 (make-obsolete 'install-shell-font-prompt 'install-shell-fonts)
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140
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141 (provide 'shell-font)
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