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1 ;;; diff.el --- Run `diff' in compilation-mode.
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2
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3 ;; Copyright (C) 1992, 1994 Free Software Foundation, Inc.
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4
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5 ;; Keywords: unix, tools
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6
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7 ;; This file is part of XEmacs.
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8
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9 ;; XEmacs is free software; you can redistribute it and/or modify it
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10 ;; under the terms of the GNU General Public License as published by
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11 ;; the Free Software Foundation; either version 2, or (at your option)
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12 ;; any later version.
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13
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14 ;; XEmacs is distributed in the hope that it will be useful, but
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15 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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17 ;; General Public License for more details.
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18
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19 ;; You should have received a copy of the GNU General Public License
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20 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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2
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21 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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22 ;; 02111-1307, USA.
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23
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24 ;;; Synched up with: FSF 19.34.
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25
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26 ;;; Commentary:
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27
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28 ;; This package helps you explore differences between files, using the
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29 ;; UNIX command diff(1). The commands are `diff' and `diff-backup'.
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30 ;; You can specify options with `diff-switches'.
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31
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32 ;;; Code:
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33
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34 (require 'compile)
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35
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36 ;;; This is duplicated in vc.el.
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37 ;;;###autoload
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38 (defvar diff-switches (purecopy "-c")
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2
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39 "*A string or list of strings specifying switches to be passed to diff.")
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40
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41 (defvar diff-command "diff"
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42 "*The command to use to run diff.")
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43
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44 (defvar diff-regexp-alist
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45 '(
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46 ;; -u format: @@ -OLDSTART,OLDEND +NEWSTART,NEWEND @@
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47 ("^@@ -\\([0-9]+\\),[0-9]+ \\+\\([0-9]+\\),[0-9]+ @@$" 1 2)
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48
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49 ;; -c format: *** OLDSTART,OLDEND ****
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50 ("^\\*\\*\\* \\([0-9]+\\),[0-9]+ \\*\\*\\*\\*$" 1 nil)
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51 ;; --- NEWSTART,NEWEND ----
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52 ("^--- \\([0-9]+\\),[0-9]+ ----$" nil 1)
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53
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54 ;; plain diff format: OLDSTART[,OLDEND]{a,d,c}NEWSTART[,NEWEND]
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55 ("^\\([0-9]+\\)\\(,[0-9]+\\)?[adc]\\([0-9]+\\)\\(,[0-9]+\\)?$" 1 3)
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56
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57 ;; -e (ed) format: OLDSTART[,OLDEND]{a,d,c}
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58 ("^\\([0-9]+\\)\\(,[0-9]+\\)?[adc]$" 1)
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59
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60 ;; -f format: {a,d,c}OLDSTART[ OLDEND]
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61 ;; -n format: {a,d,c}OLDSTART LINES-CHANGED
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62 ("^[adc]\\([0-9]+\\)\\( [0-9]+\\)?$" 1)
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63 )
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64 "Alist (REGEXP OLD-IDX NEW-IDX) of regular expressions to match difference
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65 sections in \\[diff] output. If REGEXP matches, the OLD-IDX'th
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66 subexpression gives the line number in the old file, and NEW-IDX'th
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67 subexpression gives the line number in the new file. If OLD-IDX or NEW-IDX
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68 is nil, REGEXP matches only half a section.")
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69
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70 (defvar diff-old-file nil
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71 "This is the old file name in the comparison in this buffer.")
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72 (defvar diff-new-file nil
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73 "This is the new file name in the comparison in this buffer.")
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74 (defvar diff-old-temp-file nil
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75 "This is the name of a temp file to be deleted after diff finishes.")
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76 (defvar diff-new-temp-file nil
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77 "This is the name of a temp file to be deleted after diff finishes.")
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78
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79 ;; See compilation-parse-errors-function (compile.el).
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80 (defun diff-parse-differences (limit-search find-at-least)
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81 (setq compilation-error-list nil)
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82 (message "Parsing differences...")
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83
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84 ;; Don't reparse diffs already seen at last parse.
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85 (if compilation-parsing-end (goto-char compilation-parsing-end))
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86
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87 ;; Construct in REGEXP a regexp composed of all those in dired-regexp-alist.
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88 (let ((regexp (mapconcat #'(lambda (elt)
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89 (concat "\\(" (car elt) "\\)"))
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90 diff-regexp-alist
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91 "\\|"))
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92 ;; (GROUP-IDX OLD-IDX NEW-IDX)
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93 (groups (let ((subexpr 1))
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94 (mapcar #'(lambda (elt)
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95 (prog1
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96 (cons subexpr
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97 (mapcar #'(lambda (n)
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98 (and n
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99 (+ subexpr n)))
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100 (cdr elt)))
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101 (setq subexpr (+ subexpr 1
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102 ;;#### undefined??
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103 (count-regexp-groupings
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104 (car elt))))))
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105 diff-regexp-alist)))
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106
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107 (new-error
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108 (function (lambda (file subexpr)
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109 (setq compilation-error-list
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110 (cons
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111 (cons (save-excursion
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112 ;; Report location of message
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113 ;; at beginning of line.
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114 (goto-char
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115 (match-beginning subexpr))
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116 (beginning-of-line)
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117 (point-marker))
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118 ;; Report location of corresponding text.
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119 (let ((line (string-to-int
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120 (buffer-substring
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121 (match-beginning subexpr)
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122 (match-end subexpr)))))
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123 (save-excursion
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124 (save-match-data
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125 (set-buffer (find-file-noselect file)))
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126 (save-excursion
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127 (goto-line line)
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128 (point-marker)))))
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129 compilation-error-list)))))
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130
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131 (found-desired nil)
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132 (num-loci-found 0)
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133 g)
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134
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135 (while (and (not found-desired)
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136 ;; We don't just pass LIMIT-SEARCH to re-search-forward
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137 ;; because we want to find matches containing LIMIT-SEARCH
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138 ;; but which extend past it.
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139 (re-search-forward regexp nil t))
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140
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141 ;; Find which individual regexp matched.
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142 (setq g groups)
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143 (while (and g (null (match-beginning (car (car g)))))
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144 (setq g (cdr g)))
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145 (setq g (car g))
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146
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147 (if (nth 1 g) ;OLD-IDX
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148 (funcall new-error diff-old-file (nth 1 g)))
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149 (if (nth 2 g) ;NEW-IDX
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150 (funcall new-error diff-new-file (nth 2 g)))
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151
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152 (setq num-loci-found (1+ num-loci-found))
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153 (if (or (and find-at-least
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154 (>= num-loci-found find-at-least))
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155 (and limit-search (>= (point) limit-search)))
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156 ;; We have found as many new loci as the user wants,
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157 ;; or the user wanted a specific diff, and we're past it.
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158 (setq found-desired t)))
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159 (if found-desired
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160 (setq compilation-parsing-end (point))
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161 ;; Set to point-max, not point, so we don't perpetually
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162 ;; parse the last bit of text when it isn't a diff header.
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163 (setq compilation-parsing-end (point-max)))
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164 (message "Parsing differences...done"))
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165 (setq compilation-error-list (nreverse compilation-error-list)))
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166
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167 ;;;###autoload
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168 (defun diff (old new &optional switches)
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169 "Find and display the differences between OLD and NEW files.
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170 Interactively the current buffer's file name is the default for NEW
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171 and a backup file for NEW is the default for OLD.
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172 With prefix arg, prompt for diff switches."
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173 (interactive
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174 (nconc
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175 (let (oldf newf)
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176 (nreverse
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177 (list
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178 (setq newf (buffer-file-name)
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179 newf (if (and newf (file-exists-p newf))
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180 (read-file-name
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181 (concat "Diff new file: ("
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182 (file-name-nondirectory newf) ") ")
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183 nil newf t)
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184 (read-file-name "Diff new file: " nil nil t)))
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185 (setq oldf (file-newest-backup newf)
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186 oldf (if (and oldf (file-exists-p oldf))
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187 (read-file-name
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188 (concat "Diff original file: ("
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189 (file-name-nondirectory oldf) ") ")
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190 (file-name-directory oldf) oldf t)
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191 (read-file-name "Diff original file: "
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192 (file-name-directory newf) nil t))))))
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193 (if current-prefix-arg
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194 (list (read-string "Diff switches: "
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195 (if (stringp diff-switches)
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196 diff-switches
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197 (mapconcat 'identity diff-switches " "))))
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198 nil)))
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199 (setq new (expand-file-name new)
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200 old (expand-file-name old))
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201 ;; XEmacs addition -- allow (diff "../old/" "new-file.el") to work
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202 (cond ((file-directory-p old)
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203 (or (file-directory-p new)
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204 (setq old (expand-file-name (file-name-nondirectory new)
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205 (file-name-as-directory old)))))
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206 ((file-directory-p new)
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207 (setq new (expand-file-name (file-name-nondirectory old)
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208 (file-name-as-directory new)))))
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209 (let ((old-alt (file-local-copy old))
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210 (new-alt (file-local-copy new))
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211 buf)
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212 (unwind-protect
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213 (let ((command
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214 (mapconcat 'identity
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215 (append (list diff-command)
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216 ;; Use explicitly specified switches
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217 (if switches
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218 (if (consp switches)
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219 switches (list switches))
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220 ;; If not specified, use default.
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221 (if (consp diff-switches)
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222 diff-switches
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223 (list diff-switches)))
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224 (if (or old-alt new-alt)
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225 (list "-L" old "-L" new))
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226 (list
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227 (shell-quote-argument (or old-alt old)))
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228 (list
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229 (shell-quote-argument (or new-alt new))))
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230 " ")))
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231 (setq buf
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232 (compile-internal command
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233 "No more differences" "Diff"
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234 'diff-parse-differences))
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235 (pop-to-buffer buf)
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236 ;; Avoid frightening people with "abnormally terminated"
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237 ;; if diff finds differences.
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238 (set (make-local-variable 'compilation-exit-message-function)
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239 (lambda (status code msg)
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240 (cond ((not (eq status 'exit))
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241 (cons msg code))
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242 ((zerop code)
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243 '("finished (no differences)\n" . "no differences"))
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244 ((= code 1)
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245 '("finished\n" . "differences found"))
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246 (t
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247 (cons msg code)))))
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248 (set (make-local-variable 'diff-old-file) old)
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249 (set (make-local-variable 'diff-new-file) new)
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250 (set (make-local-variable 'diff-old-temp-file) old-alt)
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251 (set (make-local-variable 'diff-new-temp-file) new-alt)
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252 (set (make-local-variable 'compilation-finish-function)
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253 (function (lambda (buff msg)
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254 (if diff-old-temp-file
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255 (delete-file diff-old-temp-file))
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256 (if diff-new-temp-file
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257 (delete-file diff-new-temp-file)))))
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258 buf))))
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259
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260 ;;;###autoload
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261 (defun diff-backup (file &optional switches)
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262 "Diff this file with its backup file or vice versa.
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263 Uses the latest backup, if there are several numerical backups.
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264 If this file is a backup, diff it with its original.
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265 The backup file is the first file given to `diff'."
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266 (interactive (list (read-file-name "Diff (file with backup): ")
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267 (if current-prefix-arg
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268 (read-string "Diff switches: "
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269 (if (stringp diff-switches)
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270 diff-switches
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271 (mapconcat 'identity
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272 diff-switches " ")))
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273 nil)))
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274 (let (bak ori)
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275 (if (backup-file-name-p file)
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276 (setq bak file
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277 ori (file-name-sans-versions file))
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278 (setq bak (or (diff-latest-backup-file file)
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279 (error "No backup found for %s" file))
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280 ori file))
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281 (diff bak ori switches)))
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282
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283 (defun diff-latest-backup-file (fn) ; actually belongs into files.el
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284 "Return the latest existing backup of FILE, or nil."
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285 (let ((handler (find-file-name-handler fn 'diff-latest-backup-file)))
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286 (if handler
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287 (funcall handler 'diff-latest-backup-file fn)
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288 ;; First try simple backup, then the highest numbered of the
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289 ;; numbered backups.
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290 ;; Ignore the value of version-control because we look for existing
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291 ;; backups, which maybe were made earlier or by another user with
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292 ;; a different value of version-control.
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293 (setq fn (file-chase-links (expand-file-name fn)))
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294 (or
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295 (let ((bak (make-backup-file-name fn)))
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296 (if (file-exists-p bak) bak))
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297 ;; We use BACKUPNAME to cope with backups stored in a different dir.
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298 (let* ((backupname (car (find-backup-file-name fn)))
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299 (dir (file-name-directory backupname))
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300 (base-versions (concat (file-name-sans-versions
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301 (file-name-nondirectory backupname))
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302 ".~"))
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303 (bv-length (length base-versions)))
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304 (concat dir
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305 (car (sort
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306 (file-name-all-completions base-versions dir)
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307 ;; bv-length is a fluid var for backup-extract-version:
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308 (function
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309 (lambda (fn1 fn2)
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310 (> (backup-extract-version fn1)
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311 (backup-extract-version fn2))))))))))))
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312
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313 (provide 'diff)
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314
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315 ;;; diff.el ends here
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