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475f9031 | 1 | ;;; ediff-merg.el --- merging utilities |
732be465 | 2 | ;;; Copyright (C) 1994, 1995 Free Software Foundation, Inc. |
475f9031 KH |
3 | |
4 | ;; Author: Michael Kifer <kifer@cs.sunysb.edu> | |
5 | ||
6 | ;; This file is part of GNU Emacs. | |
7 | ||
8 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
9 | ;; it under the terms of the GNU General Public License as published by | |
10 | ;; the Free Software Foundation; either version 2, or (at your option) | |
11 | ;; any later version. | |
12 | ||
13 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
14 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | ;; GNU General Public License for more details. | |
17 | ||
18 | ;; You should have received a copy of the GNU General Public License | |
19 | ;; along with GNU Emacs; see the file COPYING. If not, write to | |
20 | ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
21 | ||
22 | ||
23 | (require 'ediff-init) | |
24 | ||
475f9031 KH |
25 | (defvar ediff-default-variant 'default-A |
26 | "*The variant to be used as a default for buffer C in merging. | |
27 | Valid values are the symbols `default-A', `default-B', and `combined'.") | |
28 | ||
29 | (defvar ediff-combination-pattern | |
30 | '("#ifdef NEW /* variant A */" "#else /* variant B */" "#endif /* NEW */") | |
31 | "*Pattern to be used for combining difference regions in buffers A and B. | |
32 | The value is (STRING1 STRING2 STRING3). The combined text will look like this: | |
33 | ||
34 | STRING1 | |
35 | diff region from variant A | |
36 | STRING2 | |
37 | diff region from variant B | |
38 | STRING3 | |
39 | ") | |
40 | ||
41 | (ediff-defvar-local ediff-show-clashes-only nil | |
42 | "*If t, show only those diff regions where both buffers disagree with the ancestor. | |
43 | This means that regions that have status prefer-A or prefer-B will be | |
44 | skiped over. Nil means show all regions.") | |
45 | ||
46 | ||
47 | (defsubst ediff-get-combined-region (n) | |
48 | (concat (nth 0 ediff-combination-pattern) "\n" | |
49 | (ediff-get-region-contents n 'A ediff-control-buffer) | |
50 | (nth 1 ediff-combination-pattern) "\n" | |
51 | (ediff-get-region-contents n 'B ediff-control-buffer) | |
52 | (nth 2 ediff-combination-pattern) "\n")) | |
53 | ||
54 | (defsubst ediff-set-state-of-all-diffs-in-all-buffers (ctl-buf) | |
55 | (let ((n 0)) | |
56 | (while (< n ediff-number-of-differences) | |
57 | (ediff-set-state-of-diff-in-all-buffers n ctl-buf) | |
58 | (setq n (1+ n))))) | |
59 | ||
60 | (defun ediff-set-state-of-diff-in-all-buffers (n ctl-buf) | |
61 | (let ((regA (ediff-get-region-contents n 'A ctl-buf)) | |
62 | (regB (ediff-get-region-contents n 'B ctl-buf)) | |
63 | (regC (ediff-get-region-contents n 'C ctl-buf))) | |
13340e24 KH |
64 | (cond ((and (string= regA regB) (string= regA regC)) |
65 | (ediff-set-state-of-diff n 'A "=diff(B)") | |
66 | (ediff-set-state-of-diff n 'B "=diff(C)") | |
67 | (ediff-set-state-of-diff n 'C "=diff(A)")) | |
68 | ((string= regA regB) | |
475f9031 KH |
69 | (ediff-set-state-of-diff n 'A "=diff(B)") |
70 | (ediff-set-state-of-diff n 'B "=diff(A)") | |
71 | (ediff-set-state-of-diff n 'C nil)) | |
72 | ((string= regA regC) | |
73 | (ediff-set-state-of-diff n 'A "=diff(C)") | |
74 | (ediff-set-state-of-diff n 'C "=diff(A)") | |
75 | (ediff-set-state-of-diff n 'B nil)) | |
76 | ((string= regB regC) | |
77 | (ediff-set-state-of-diff n 'C "=diff(B)") | |
78 | (ediff-set-state-of-diff n 'B "=diff(C)") | |
79 | (ediff-set-state-of-diff n 'A nil)) | |
80 | ((string= regC (ediff-get-combined-region n)) | |
81 | (ediff-set-state-of-diff n 'A nil) | |
82 | (ediff-set-state-of-diff n 'B nil) | |
83 | (ediff-set-state-of-diff n 'C "=diff(A+B)")) | |
84 | (t (ediff-set-state-of-diff n 'A nil) | |
85 | (ediff-set-state-of-diff n 'B nil) | |
86 | (ediff-set-state-of-diff n 'C nil))) | |
87 | )) | |
13340e24 KH |
88 | |
89 | (defun ediff-set-merge-mode () | |
90 | ;; by Stig@hackvan.com | |
91 | (normal-mode t) | |
92 | (remove-hook 'local-write-file-hooks 'ediff-set-merge-mode)) | |
475f9031 KH |
93 | |
94 | ;; Go over all diffs starting with DIFF-NUM and copy regions into buffer C | |
95 | ;; according to the state of the difference. | |
96 | ;; Since ediff-copy-diff refuses to copy identical diff regions, there is | |
97 | ;; no need to optimize ediff-do-merge any further. | |
98 | ;; | |
99 | ;; If re-merging, change state of merge in all diffs starting with | |
100 | ;; DIFF-NUM, except those where the state is prefer-* or where it is | |
13340e24 KH |
101 | ;; `default-*' or `combined' but the buf C region appears to be modified |
102 | ;; since last set by default. | |
475f9031 KH |
103 | (defun ediff-do-merge (diff-num &optional remerging) |
104 | (if (< diff-num 0) (setq diff-num 0)) | |
105 | (let ((n diff-num) | |
106 | (default-state-of-merge (format "%S" ediff-default-variant)) | |
13340e24 | 107 | do-not-copy state-of-merge) |
475f9031 | 108 | (while (< n ediff-number-of-differences) |
475f9031 KH |
109 | (if (= (mod n 10) 0) |
110 | (message "%s buffers A & B into C ... region %d of %d" | |
111 | (if remerging "Re-merging" "Merging") | |
112 | n | |
113 | ediff-number-of-differences)) | |
114 | ||
115 | (setq state-of-merge (ediff-get-state-of-merge n)) | |
116 | (setq do-not-copy (string= state-of-merge default-state-of-merge)) | |
117 | ||
118 | (if remerging | |
119 | (let ((reg-A (ediff-get-region-contents n 'A ediff-control-buffer)) | |
120 | (reg-B (ediff-get-region-contents n 'B ediff-control-buffer)) | |
121 | (reg-C (ediff-get-region-contents n 'C ediff-control-buffer))) | |
122 | ||
13340e24 KH |
123 | ;;; was edited since first set by default |
124 | (if (or (and (string= state-of-merge "default-A") | |
475f9031 | 125 | (not (string= reg-A reg-C))) |
13340e24 KH |
126 | ;; was edited since first set by default |
127 | (and (string= state-of-merge "default-B") | |
128 | (not (string= reg-B reg-C))) | |
129 | ;; was edited since first set by default | |
130 | (and (string= state-of-merge "combined") | |
131 | (not (string= | |
132 | (ediff-make-combined-diff reg-A reg-B) reg-C))) | |
133 | ;; was prefered--ignore | |
134 | (string-match "prefer" state-of-merge)) | |
475f9031 KH |
135 | (setq do-not-copy t)) |
136 | ||
137 | ;; change state of merge for this diff, if necessary | |
13340e24 KH |
138 | (if (and (string-match "\\(default\\|combined\\)" state-of-merge) |
139 | (not do-not-copy)) | |
475f9031 KH |
140 | (ediff-set-state-of-merge |
141 | n (format "%S" ediff-default-variant))) | |
142 | )) | |
143 | ||
144 | ;; state-of-merge may have changed via ediff-set-state-of-merge, so | |
13340e24 | 145 | ;; check it once again |
475f9031 KH |
146 | (setq state-of-merge (ediff-get-state-of-merge n)) |
147 | ||
148 | (or do-not-copy | |
149 | (if (string= state-of-merge "combined") | |
150 | ;; use n+1 because ediff-combine-diffs works via user numbering | |
151 | ;; of diffs, which is 1+ to what ediff uses internally | |
152 | (ediff-combine-diffs (1+ n) 'batch) | |
13340e24 KH |
153 | (ediff-copy-diff |
154 | n (if (string-match "-A" state-of-merge) 'A 'B) 'C 'batch))) | |
475f9031 KH |
155 | (setq n (1+ n))) |
156 | (message "Merging buffers A & B into C ... Done") | |
157 | )) | |
158 | ||
159 | ||
160 | (defun ediff-re-merge () | |
161 | "Remerge unmodified diff regions using a new default. Start with the current region." | |
162 | (interactive) | |
163 | (let* ((default-variant-alist | |
164 | (list '("default-A") '("default-B") '("combined"))) | |
165 | (actual-alist | |
166 | (delete (list (symbol-name ediff-default-variant)) | |
167 | default-variant-alist))) | |
168 | (setq ediff-default-variant | |
169 | (intern | |
170 | (completing-read | |
171 | (format "Current merge default is `%S'. New default: " | |
172 | ediff-default-variant) | |
173 | actual-alist nil 'must-match))) | |
174 | (ediff-do-merge ediff-current-difference 'remerge) | |
175 | (ediff-recenter) | |
176 | )) | |
177 | ||
178 | (defun ediff-shrink-window-C (arg) | |
179 | "Shrink window C to just one line. | |
180 | With a prefix argument, returns window C to its normal size. | |
181 | Used only for merging jobs." | |
182 | (interactive "P") | |
183 | (if (not ediff-merge-job) | |
184 | (error "ediff-shrink-window-C can be used only for merging jobs")) | |
185 | (cond ((eq arg '-) (setq arg -1)) | |
186 | ((not (numberp arg)) (setq arg nil))) | |
187 | (cond ((null arg) | |
188 | (let ((ediff-merge-window-share | |
189 | (if (< (window-height ediff-window-C) 3) | |
190 | ediff-merge-window-share 0))) | |
191 | (setq ediff-window-config-saved "") ; force redisplay | |
192 | (ediff-recenter 'no-rehighlight))) | |
193 | ((and (< arg 0) (> (window-height ediff-window-C) 2)) | |
194 | (setq ediff-merge-window-share (* ediff-merge-window-share 0.9)) | |
195 | (setq ediff-window-config-saved "") ; force redisplay | |
196 | (ediff-recenter 'no-rehighlight)) | |
197 | ((and (> arg 0) (> (window-height ediff-window-A) 2)) | |
198 | (setq ediff-merge-window-share (* ediff-merge-window-share 1.1)) | |
199 | (setq ediff-window-config-saved "") ; force redisplay | |
200 | (ediff-recenter 'no-rehighlight)))) | |
201 | ||
202 | ||
203 | ;; N here is the user's region number. It is 1+ what Ediff uses internally. | |
204 | (defun ediff-combine-diffs (n &optional batch-invocation) | |
205 | "Combine Nth diff regions of buffers A and B and place the combination in C. | |
206 | Combining is done using the list in variable `ediff-combination-pattern'." | |
207 | (interactive "P") | |
208 | (setq n (if n (1- n) ediff-current-difference)) | |
209 | ||
210 | (let (regA regB reg-combined) | |
211 | (setq regA (ediff-get-region-contents n 'A ediff-control-buffer) | |
212 | regB (ediff-get-region-contents n 'B ediff-control-buffer)) | |
213 | ||
13340e24 | 214 | (setq reg-combined (ediff-make-combined-diff regA regB)) |
475f9031 KH |
215 | |
216 | (ediff-copy-diff n nil 'C batch-invocation reg-combined)) | |
13340e24 | 217 | (or batch-invocation (ediff-recenter))) |
475f9031 | 218 | |
13340e24 KH |
219 | (defsubst ediff-make-combined-diff (regA regB) |
220 | (concat (nth 0 ediff-combination-pattern) "\n" | |
221 | regA | |
222 | (nth 1 ediff-combination-pattern) "\n" | |
223 | regB | |
224 | (nth 2 ediff-combination-pattern) "\n")) | |
475f9031 KH |
225 | |
226 | ||
227 | ;; Checks if the region in buff C looks like a combination of the regions | |
228 | ;; in buffers A and B. Returns a list (reg-a-beg reg-a-end reg-b-beg reg-b-end) | |
229 | ;; These refer to where the copies of region A and B start and end in buffer C | |
230 | (defun ediff-looks-like-combined-merge (region-num) | |
231 | (if ediff-merge-job | |
232 | (let ((combined (string-match (regexp-quote "(A+B)") | |
233 | (or (ediff-get-state-of-diff region-num 'C) | |
234 | ""))) | |
235 | (reg-beg (ediff-get-diff-posn 'C 'beg region-num)) | |
236 | (reg-end (ediff-get-diff-posn 'C 'end region-num)) | |
237 | (pat1 (nth 0 ediff-combination-pattern)) | |
238 | (pat2 (nth 1 ediff-combination-pattern)) | |
239 | (pat3 (nth 2 ediff-combination-pattern)) | |
240 | reg-a-beg reg-a-end reg-b-beg reg-b-end reg-c-beg reg-c-end) | |
241 | ||
242 | (if combined | |
243 | (ediff-eval-in-buffer ediff-buffer-C | |
244 | (goto-char reg-beg) | |
245 | (search-forward pat1 reg-end 'noerror) | |
246 | (setq reg-a-beg (match-beginning 0)) | |
247 | (setq reg-a-end (match-end 0)) | |
248 | (search-forward pat2 reg-end 'noerror) | |
249 | (setq reg-b-beg (match-beginning 0)) | |
250 | (setq reg-b-end (match-end 0)) | |
251 | (search-forward pat3 reg-end 'noerror) | |
252 | (setq reg-c-beg (match-beginning 0)) | |
253 | (setq reg-c-end (match-end 0)))) | |
254 | ||
255 | (if (and reg-a-beg reg-a-end reg-b-beg reg-b-end) | |
256 | (list reg-a-beg reg-a-end reg-b-beg reg-b-end reg-c-beg reg-c-end)) | |
257 | ))) | |
258 | ||
259 | ||
260 | (provide 'ediff-merg) | |
261 | ||
262 | ;; ediff-merg.el ends here |