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1 ;;; ediff-merg.el --- merging utilities
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2
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3 ;; Copyright (C) 1994, 1995, 1996 Free Software Foundation, Inc.
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4
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5 ;; Author: Michael Kifer <kifer@cs.sunysb.edu>
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6
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7 ;; This file is part of GNU Emacs.
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8
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9 ;; GNU Emacs is free software; you can redistribute it and/or modify
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10 ;; it 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 ;; GNU Emacs is distributed in the hope that it will be useful,
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15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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17 ;; GNU 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 GNU Emacs; see the file COPYING. If not, write to the
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21 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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22 ;; Boston, MA 02111-1307, USA.
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23
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24 ;;; Code:
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25
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26 (require 'ediff-init)
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27
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28
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29 (defvar ediff-default-variant 'combined
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30 "*The variant to be used as a default for buffer C in merging.
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31 Valid values are the symbols `default-A', `default-B', and `combined'.")
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32
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33 (defvar ediff-combination-pattern
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34 '("<<<<<<<<<<<<<< variant A" ">>>>>>>>>>>>>> variant B" "======= end of combination")
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35 "*Pattern to be used for combining difference regions in buffers A and B.
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36 The value is (STRING1 STRING2 STRING3). The combined text will look like this:
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37
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38 STRING1
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39 diff region from variant A
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40 STRING2
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41 diff region from variant B
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42 STRING3
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43 ")
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44
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45 (ediff-defvar-local ediff-show-clashes-only nil
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46 "*If t, show only those diff regions where both buffers disagree with the ancestor.
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47 This means that regions that have status prefer-A or prefer-B will be
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48 skiped over. Nil means show all regions.")
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49
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50
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51 (defsubst ediff-get-combined-region (n)
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52 (concat (nth 0 ediff-combination-pattern) "\n"
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53 (ediff-get-region-contents n 'A ediff-control-buffer)
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54 (nth 1 ediff-combination-pattern) "\n"
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55 (ediff-get-region-contents n 'B ediff-control-buffer)
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56 (nth 2 ediff-combination-pattern) "\n"))
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57
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58 (defsubst ediff-make-combined-diff (regA regB)
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59 (concat (nth 0 ediff-combination-pattern) "\n"
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60 regA
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61 (nth 1 ediff-combination-pattern) "\n"
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62 regB
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63 (nth 2 ediff-combination-pattern) "\n"))
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64
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65 (defsubst ediff-set-state-of-all-diffs-in-all-buffers (ctl-buf)
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66 (let ((n 0))
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67 (while (< n ediff-number-of-differences)
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68 (ediff-set-state-of-diff-in-all-buffers n ctl-buf)
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69 (setq n (1+ n)))))
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70
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71 (defun ediff-set-state-of-diff-in-all-buffers (n ctl-buf)
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72 (let ((regA (ediff-get-region-contents n 'A ctl-buf))
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73 (regB (ediff-get-region-contents n 'B ctl-buf))
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74 (regC (ediff-get-region-contents n 'C ctl-buf)))
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75 (cond ((and (string= regA regB) (string= regA regC))
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76 (ediff-set-state-of-diff n 'A "=diff(B)")
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77 (ediff-set-state-of-diff n 'B "=diff(C)")
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78 (ediff-set-state-of-diff n 'C "=diff(A)"))
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79 ((string= regA regB)
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80 (ediff-set-state-of-diff n 'A "=diff(B)")
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81 (ediff-set-state-of-diff n 'B "=diff(A)")
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82 (ediff-set-state-of-diff n 'C nil))
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83 ((string= regA regC)
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84 (ediff-set-state-of-diff n 'A "=diff(C)")
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85 (ediff-set-state-of-diff n 'C "=diff(A)")
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86 (ediff-set-state-of-diff n 'B nil))
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87 ((string= regB regC)
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88 (ediff-set-state-of-diff n 'C "=diff(B)")
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89 (ediff-set-state-of-diff n 'B "=diff(C)")
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90 (ediff-set-state-of-diff n 'A nil))
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91 ((string= regC (ediff-get-combined-region n))
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92 (ediff-set-state-of-diff n 'A nil)
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93 (ediff-set-state-of-diff n 'B nil)
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94 (ediff-set-state-of-diff n 'C "=diff(A+B)"))
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95 (t (ediff-set-state-of-diff n 'A nil)
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96 (ediff-set-state-of-diff n 'B nil)
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97 (ediff-set-state-of-diff n 'C nil)))
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98 ))
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99
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100 (defun ediff-set-merge-mode ()
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101 ;; by Stig@hackvan.com
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102 (normal-mode t)
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103 (remove-hook 'local-write-file-hooks 'ediff-set-merge-mode))
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104
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105
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106 ;; Go over all diffs starting with DIFF-NUM and copy regions into buffer C
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107 ;; according to the state of the difference.
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108 ;; Since ediff-copy-diff refuses to copy identical diff regions, there is
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109 ;; no need to optimize ediff-do-merge any further.
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110 ;;
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111 ;; If re-merging, change state of merge in all diffs starting with
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112 ;; DIFF-NUM, except those where the state is prefer-* or where it is
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113 ;; `default-*' or `combined' but the buf C region appears to be modified
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114 ;; since last set by default.
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115 (defun ediff-do-merge (diff-num &optional remerging)
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116 (if (< diff-num 0) (setq diff-num 0))
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117 (let ((n diff-num)
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118 ;;(default-state-of-merge (format "%S" ediff-default-variant))
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119 do-not-copy state-of-merge)
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120 (while (< n ediff-number-of-differences)
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121 (setq do-not-copy nil) ; reset after each cycle
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122 (if (= (mod n 10) 0)
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123 (message "%s buffers A & B into C ... region %d of %d"
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124 (if remerging "Re-merging" "Merging")
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125 n
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126 ediff-number-of-differences))
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127
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128 (setq state-of-merge (ediff-get-state-of-merge n))
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129
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130 (if remerging
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131 (let ((reg-A (ediff-get-region-contents n 'A ediff-control-buffer))
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132 (reg-B (ediff-get-region-contents n 'B ediff-control-buffer))
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133 (reg-C (ediff-get-region-contents n 'C ediff-control-buffer)))
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134
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135 ;; if region was edited since it was first set by default
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136 (if (or (and (string= state-of-merge "default-A")
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137 (not (string= reg-A reg-C)))
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138 ;; was edited since first set by default
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139 (and (string= state-of-merge "default-B")
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140 (not (string= reg-B reg-C)))
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141 ;; was edited since first set by default
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142 (and (string= state-of-merge "combined")
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143 (not (string=
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144 (ediff-make-combined-diff reg-A reg-B) reg-C)))
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145 ;; was preferred--ignore
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146 (string-match "prefer" state-of-merge))
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147 (setq do-not-copy t))
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148
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149 ;; change state of merge for this diff, if necessary
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150 (if (and (string-match "\\(default\\|combined\\)" state-of-merge)
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151 (not do-not-copy))
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152 (ediff-set-state-of-merge
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153 n (format "%S" ediff-default-variant)))
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154 ))
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155
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156 ;; state-of-merge may have changed via ediff-set-state-of-merge, so
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157 ;; check it once again
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158 (setq state-of-merge (ediff-get-state-of-merge n))
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159
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160 (or do-not-copy
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161 (if (string= state-of-merge "combined")
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162 ;; use n+1 because ediff-combine-diffs works via user numbering
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163 ;; of diffs, which is 1+ to what ediff uses internally
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164 (ediff-combine-diffs (1+ n) 'batch)
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165 (ediff-copy-diff
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166 n (if (string-match "-A" state-of-merge) 'A 'B) 'C 'batch)))
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167 (setq n (1+ n)))
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168 (message "Merging buffers A & B into C ... Done")
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169 ))
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170
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171
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172 (defun ediff-re-merge ()
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173 "Remerge unmodified diff regions using a new default. Start with the current region."
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174 (interactive)
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175 (let* ((default-variant-alist
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176 (list '("default-A") '("default-B") '("combined")))
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177 (actual-alist
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178 (delete (list (symbol-name ediff-default-variant))
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179 default-variant-alist)))
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180 (setq ediff-default-variant
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181 (intern
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182 (completing-read
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183 (format "Current merge default is `%S'. New default: "
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184 ediff-default-variant)
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185 actual-alist nil 'must-match)))
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186 (ediff-do-merge ediff-current-difference 'remerge)
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187 (ediff-recenter)
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188 ))
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189
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190 (defun ediff-shrink-window-C (arg)
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191 "Shrink window C to just one line.
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192 With a prefix argument, returns window C to its normal size.
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193 Used only for merging jobs."
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194 (interactive "P")
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195 (if (not ediff-merge-job)
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196 (error "ediff-shrink-window-C can be used only for merging jobs"))
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197 (cond ((eq arg '-) (setq arg -1))
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198 ((not (numberp arg)) (setq arg nil)))
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199 (cond ((null arg)
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200 (let ((ediff-merge-window-share
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201 (if (< (window-height ediff-window-C) 3)
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202 ediff-merge-window-share 0)))
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203 (setq ediff-window-config-saved "") ; force redisplay
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204 (ediff-recenter 'no-rehighlight)))
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205 ((and (< arg 0) (> (window-height ediff-window-C) 2))
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206 (setq ediff-merge-window-share (* ediff-merge-window-share 0.9))
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207 (setq ediff-window-config-saved "") ; force redisplay
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208 (ediff-recenter 'no-rehighlight))
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209 ((and (> arg 0) (> (window-height ediff-window-A) 2))
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210 (setq ediff-merge-window-share (* ediff-merge-window-share 1.1))
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211 (setq ediff-window-config-saved "") ; force redisplay
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212 (ediff-recenter 'no-rehighlight))))
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213
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214
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215 ;; N here is the user's region number. It is 1+ what Ediff uses internally.
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216 (defun ediff-combine-diffs (n &optional batch-invocation)
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217 "Combine Nth diff regions of buffers A and B and place the combination in C.
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218 N is a prefix argument. If nil, combine the current difference regions.
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219 Combining is done according to the specifications in variable
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220 `ediff-combination-pattern'."
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221 (interactive "P")
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222 (setq n (if (numberp n) (1- n) ediff-current-difference))
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223
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224 (let (regA regB reg-combined)
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225 (setq regA (ediff-get-region-contents n 'A ediff-control-buffer)
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226 regB (ediff-get-region-contents n 'B ediff-control-buffer))
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227
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228 (setq reg-combined (ediff-make-combined-diff regA regB))
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229
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230 (ediff-copy-diff n nil 'C batch-invocation reg-combined))
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231 (or batch-invocation (ediff-jump-to-difference (1+ n))))
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232
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233
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234 ;; Checks if the region in buff C looks like a combination of the regions
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235 ;; in buffers A and B. Returns a list (reg-a-beg reg-a-end reg-b-beg reg-b-end)
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236 ;; These refer to where the copies of region A and B start and end in buffer C
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237 (defun ediff-looks-like-combined-merge (region-num)
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238 (if ediff-merge-job
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239 (let ((combined (string-match (regexp-quote "(A+B)")
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240 (or (ediff-get-state-of-diff region-num 'C)
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241 "")))
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242 (reg-beg (ediff-get-diff-posn 'C 'beg region-num))
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243 (reg-end (ediff-get-diff-posn 'C 'end region-num))
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244 (pat1 (nth 0 ediff-combination-pattern))
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245 (pat2 (nth 1 ediff-combination-pattern))
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246 (pat3 (nth 2 ediff-combination-pattern))
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247 reg-a-beg reg-a-end reg-b-beg reg-b-end reg-c-beg reg-c-end)
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248
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249 (if combined
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250 (ediff-eval-in-buffer ediff-buffer-C
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251 (goto-char reg-beg)
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252 (search-forward pat1 reg-end 'noerror)
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253 (setq reg-a-beg (match-beginning 0))
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254 (setq reg-a-end (match-end 0))
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255 (search-forward pat2 reg-end 'noerror)
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256 (setq reg-b-beg (match-beginning 0))
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257 (setq reg-b-end (match-end 0))
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258 (search-forward pat3 reg-end 'noerror)
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259 (setq reg-c-beg (match-beginning 0))
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260 (setq reg-c-end (match-end 0))))
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261
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262 (if (and reg-a-beg reg-a-end reg-b-beg reg-b-end)
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263 (list reg-a-beg reg-a-end reg-b-beg reg-b-end reg-c-beg reg-c-end))
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264 )))
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265
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266
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267 (provide 'ediff-merg)
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268
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269 ;; ediff-merg.el ends here
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