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475f9031 | 1 | ;;; ediff-merg.el --- merging utilities |
b578f267 | 2 | |
ddc90f39 | 3 | ;; Copyright (C) 1994, 1995, 1996, 1997 Free Software Foundation, Inc. |
475f9031 KH |
4 | |
5 | ;; Author: Michael Kifer <kifer@cs.sunysb.edu> | |
6 | ||
7 | ;; This file is part of GNU Emacs. | |
8 | ||
9 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
10 | ;; it under the terms of the GNU General Public License as published by | |
11 | ;; the Free Software Foundation; either version 2, or (at your option) | |
12 | ;; any later version. | |
13 | ||
14 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
15 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | ;; GNU General Public License for more details. | |
18 | ||
19 | ;; You should have received a copy of the GNU General Public License | |
b578f267 EN |
20 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
21 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
22 | ;; Boston, MA 02111-1307, USA. | |
475f9031 | 23 | |
b578f267 | 24 | ;;; Code: |
475f9031 | 25 | |
ddc90f39 MK |
26 | (provide 'ediff-merg) |
27 | ||
ddc90f39 MK |
28 | ;; compiler pacifier |
29 | (defvar ediff-window-A) | |
30 | (defvar ediff-window-B) | |
31 | (defvar ediff-window-C) | |
32 | (defvar ediff-merge-window-share) | |
33 | (defvar ediff-window-config-saved) | |
34 | ||
35 | (eval-when-compile | |
36 | (let ((load-path (cons (expand-file-name ".") load-path))) | |
37 | (or (featurep 'ediff-init) | |
38 | (load "ediff-init.el" nil nil 'nosuffix)) | |
39 | (or (featurep 'ediff-util) | |
40 | (load "ediff-util.el" nil nil 'nosuffix)) | |
41 | )) | |
42 | ;; end pacifier | |
43 | ||
475f9031 KH |
44 | (require 'ediff-init) |
45 | ||
1e70790f MK |
46 | (defcustom ediff-quit-merge-hook 'ediff-maybe-save-and-delete-merge |
47 | "*Hooks to run before quitting a merge job. | |
48 | The most common use is to save and delete the merge buffer." | |
49 | :type 'hook | |
50 | :group 'ediff-merge) | |
51 | ||
bbe6126c | 52 | |
ddc90f39 | 53 | (defcustom ediff-default-variant 'combined |
475f9031 | 54 | "*The variant to be used as a default for buffer C in merging. |
ddc90f39 MK |
55 | Valid values are the symbols `default-A', `default-B', and `combined'." |
56 | :type '(radio (const default-A) (const default-B) (const combined)) | |
57 | :group 'ediff-merge) | |
475f9031 | 58 | |
ddc90f39 | 59 | (defcustom ediff-combination-pattern |
086171bf | 60 | '("<<<<<<< variant A" A ">>>>>>> variant B" B "####### Ancestor" Ancestor "======= end") |
475f9031 | 61 | "*Pattern to be used for combining difference regions in buffers A and B. |
086171bf MK |
62 | The value must be a list of the form |
63 | (STRING1 bufspec1 STRING2 bufspec2 STRING3 bufspec3 STRING4) | |
64 | where bufspec is the symbol A, B, or Ancestor. For instance, if the value is | |
65 | '(STRING1 A STRING2 Ancestor STRING3 B STRING4) then the | |
66 | combined text will look like this: | |
475f9031 KH |
67 | |
68 | STRING1 | |
69 | diff region from variant A | |
70 | STRING2 | |
086171bf | 71 | diff region from the ancestor |
475f9031 | 72 | STRING3 |
086171bf MK |
73 | diff region from variant B |
74 | STRING4 | |
ddc90f39 | 75 | " |
086171bf MK |
76 | :type '(choice (list string symbol string symbol string) |
77 | (list string symbol string symbol string symbol string)) | |
ddc90f39 | 78 | :group 'ediff-merge) |
475f9031 | 79 | |
3af0304a | 80 | (defcustom ediff-show-clashes-only nil |
475f9031 KH |
81 | "*If t, show only those diff regions where both buffers disagree with the ancestor. |
82 | This means that regions that have status prefer-A or prefer-B will be | |
3af0304a MK |
83 | skiped over. Nil means show all regions." |
84 | :type 'boolean | |
85 | :group 'ediff-merge | |
86 | ) | |
87 | (make-variable-buffer-local 'ediff-show-clashes-only) | |
88 | ||
89 | (defcustom ediff-skip-merge-regions-that-differ-from-default nil | |
90 | "*If t, show only the regions that have not been changed by the user. | |
91 | A region is considered to have been changed if it is different from the current | |
92 | default (`default-A', `default-B', `combined') and it hasn't been marked as | |
93 | `prefer-A' or `prefer-B'. | |
94 | A region is considered to have been changed also when it is marked as | |
95 | as `prefer-A', but is different from the corresponding difference region in | |
96 | Buffer A or if it is marked as `prefer-B' and is different from the region in | |
97 | Buffer B." | |
98 | :type 'boolean | |
99 | :group 'ediff-merge | |
100 | ) | |
101 | (make-variable-buffer-local 'ediff-skip-merge-regions-that-differ-from-default) | |
475f9031 | 102 | |
8e41a31c MK |
103 | ;; If ediff-show-clashes-only, check if there is no clash between the ancestor |
104 | ;; and one of the variants. | |
105 | (defsubst ediff-merge-region-is-non-clash (n) | |
106 | (and ediff-show-clashes-only | |
107 | (string-match "prefer" (or (ediff-get-state-of-merge n) "")))) | |
108 | ||
3af0304a MK |
109 | ;; If ediff-skip-changed-regions, check if the merge region differs from |
110 | ;; the current default. If a region is different from the default, it means | |
111 | ;; that the user has made determination as to how to merge for this particular | |
112 | ;; region. | |
113 | (defsubst ediff-skip-merge-region-if-changed-from-default-p (n) | |
114 | (and ediff-skip-merge-regions-that-differ-from-default | |
115 | (ediff-merge-changed-from-default-p n 'prefers-too))) | |
116 | ||
117 | ||
086171bf MK |
118 | (defun ediff-get-combined-region (n) |
119 | (let ((pattern-list ediff-combination-pattern) | |
120 | (combo-region "") | |
121 | (err-msg | |
122 | "ediff-combination-pattern: Invalid format. Please consult the documentation") | |
123 | diff-region region-delim region-spec) | |
124 | ||
125 | (if (< (length pattern-list) 5) | |
126 | (error err-msg)) | |
127 | ||
128 | (while (> (length pattern-list) 2) | |
129 | (setq region-delim (nth 0 pattern-list) | |
130 | region-spec (nth 1 pattern-list)) | |
131 | (or (and (stringp region-delim) (memq region-spec '(A B Ancestor))) | |
132 | (error err-msg)) | |
133 | ||
134 | (condition-case err | |
135 | (setq combo-region | |
136 | (concat combo-region | |
137 | region-delim "\n" | |
138 | (ediff-get-region-contents | |
139 | n region-spec ediff-control-buffer))) | |
140 | (error "")) | |
141 | (setq pattern-list (cdr (cdr pattern-list))) | |
142 | ) | |
143 | ||
144 | (setq region-delim (nth 0 pattern-list)) | |
145 | (or (stringp region-delim) | |
146 | (error err-msg)) | |
147 | (setq combo-region (concat combo-region region-delim "\n")) | |
148 | )) | |
149 | ||
150 | ;;(defsubst ediff-make-combined-diff (regA regB) | |
151 | ;; (concat (nth 0 ediff-combination-pattern) "\n" | |
152 | ;; regA | |
153 | ;; (nth 1 ediff-combination-pattern) "\n" | |
154 | ;; regB | |
155 | ;; (nth 2 ediff-combination-pattern) "\n")) | |
009650b3 | 156 | |
475f9031 KH |
157 | (defsubst ediff-set-state-of-all-diffs-in-all-buffers (ctl-buf) |
158 | (let ((n 0)) | |
159 | (while (< n ediff-number-of-differences) | |
160 | (ediff-set-state-of-diff-in-all-buffers n ctl-buf) | |
161 | (setq n (1+ n))))) | |
162 | ||
163 | (defun ediff-set-state-of-diff-in-all-buffers (n ctl-buf) | |
164 | (let ((regA (ediff-get-region-contents n 'A ctl-buf)) | |
165 | (regB (ediff-get-region-contents n 'B ctl-buf)) | |
166 | (regC (ediff-get-region-contents n 'C ctl-buf))) | |
13340e24 KH |
167 | (cond ((and (string= regA regB) (string= regA regC)) |
168 | (ediff-set-state-of-diff n 'A "=diff(B)") | |
169 | (ediff-set-state-of-diff n 'B "=diff(C)") | |
170 | (ediff-set-state-of-diff n 'C "=diff(A)")) | |
171 | ((string= regA regB) | |
475f9031 KH |
172 | (ediff-set-state-of-diff n 'A "=diff(B)") |
173 | (ediff-set-state-of-diff n 'B "=diff(A)") | |
174 | (ediff-set-state-of-diff n 'C nil)) | |
175 | ((string= regA regC) | |
176 | (ediff-set-state-of-diff n 'A "=diff(C)") | |
177 | (ediff-set-state-of-diff n 'C "=diff(A)") | |
178 | (ediff-set-state-of-diff n 'B nil)) | |
179 | ((string= regB regC) | |
180 | (ediff-set-state-of-diff n 'C "=diff(B)") | |
181 | (ediff-set-state-of-diff n 'B "=diff(C)") | |
182 | (ediff-set-state-of-diff n 'A nil)) | |
183 | ((string= regC (ediff-get-combined-region n)) | |
184 | (ediff-set-state-of-diff n 'A nil) | |
185 | (ediff-set-state-of-diff n 'B nil) | |
186 | (ediff-set-state-of-diff n 'C "=diff(A+B)")) | |
187 | (t (ediff-set-state-of-diff n 'A nil) | |
188 | (ediff-set-state-of-diff n 'B nil) | |
189 | (ediff-set-state-of-diff n 'C nil))) | |
190 | )) | |
13340e24 KH |
191 | |
192 | (defun ediff-set-merge-mode () | |
13340e24 KH |
193 | (normal-mode t) |
194 | (remove-hook 'local-write-file-hooks 'ediff-set-merge-mode)) | |
c439fb30 | 195 | |
475f9031 KH |
196 | |
197 | ;; Go over all diffs starting with DIFF-NUM and copy regions into buffer C | |
198 | ;; according to the state of the difference. | |
199 | ;; Since ediff-copy-diff refuses to copy identical diff regions, there is | |
200 | ;; no need to optimize ediff-do-merge any further. | |
201 | ;; | |
202 | ;; If re-merging, change state of merge in all diffs starting with | |
203 | ;; DIFF-NUM, except those where the state is prefer-* or where it is | |
13340e24 KH |
204 | ;; `default-*' or `combined' but the buf C region appears to be modified |
205 | ;; since last set by default. | |
475f9031 KH |
206 | (defun ediff-do-merge (diff-num &optional remerging) |
207 | (if (< diff-num 0) (setq diff-num 0)) | |
208 | (let ((n diff-num) | |
bbe6126c | 209 | ;;(default-state-of-merge (format "%S" ediff-default-variant)) |
13340e24 | 210 | do-not-copy state-of-merge) |
475f9031 | 211 | (while (< n ediff-number-of-differences) |
bbe6126c | 212 | (setq do-not-copy nil) ; reset after each cycle |
475f9031 KH |
213 | (if (= (mod n 10) 0) |
214 | (message "%s buffers A & B into C ... region %d of %d" | |
215 | (if remerging "Re-merging" "Merging") | |
216 | n | |
217 | ediff-number-of-differences)) | |
218 | ||
219 | (setq state-of-merge (ediff-get-state-of-merge n)) | |
475f9031 KH |
220 | |
221 | (if remerging | |
222 | (let ((reg-A (ediff-get-region-contents n 'A ediff-control-buffer)) | |
223 | (reg-B (ediff-get-region-contents n 'B ediff-control-buffer)) | |
224 | (reg-C (ediff-get-region-contents n 'C ediff-control-buffer))) | |
225 | ||
bbe6126c | 226 | ;; if region was edited since it was first set by default |
3af0304a MK |
227 | (if (or (ediff-merge-changed-from-default-p n) |
228 | ;; was preferred | |
13340e24 | 229 | (string-match "prefer" state-of-merge)) |
3af0304a | 230 | ;; then ignore |
475f9031 KH |
231 | (setq do-not-copy t)) |
232 | ||
233 | ;; change state of merge for this diff, if necessary | |
13340e24 KH |
234 | (if (and (string-match "\\(default\\|combined\\)" state-of-merge) |
235 | (not do-not-copy)) | |
475f9031 KH |
236 | (ediff-set-state-of-merge |
237 | n (format "%S" ediff-default-variant))) | |
238 | )) | |
239 | ||
240 | ;; state-of-merge may have changed via ediff-set-state-of-merge, so | |
13340e24 | 241 | ;; check it once again |
475f9031 KH |
242 | (setq state-of-merge (ediff-get-state-of-merge n)) |
243 | ||
244 | (or do-not-copy | |
245 | (if (string= state-of-merge "combined") | |
246 | ;; use n+1 because ediff-combine-diffs works via user numbering | |
247 | ;; of diffs, which is 1+ to what ediff uses internally | |
248 | (ediff-combine-diffs (1+ n) 'batch) | |
13340e24 KH |
249 | (ediff-copy-diff |
250 | n (if (string-match "-A" state-of-merge) 'A 'B) 'C 'batch))) | |
475f9031 KH |
251 | (setq n (1+ n))) |
252 | (message "Merging buffers A & B into C ... Done") | |
253 | )) | |
254 | ||
255 | ||
256 | (defun ediff-re-merge () | |
3af0304a | 257 | "Remerge unmodified diff regions using a new default. Start with the current region." |
475f9031 KH |
258 | (interactive) |
259 | (let* ((default-variant-alist | |
260 | (list '("default-A") '("default-B") '("combined"))) | |
261 | (actual-alist | |
262 | (delete (list (symbol-name ediff-default-variant)) | |
263 | default-variant-alist))) | |
264 | (setq ediff-default-variant | |
265 | (intern | |
266 | (completing-read | |
3af0304a | 267 | (format "Current merge default is `%S'. New default: " |
475f9031 KH |
268 | ediff-default-variant) |
269 | actual-alist nil 'must-match))) | |
270 | (ediff-do-merge ediff-current-difference 'remerge) | |
271 | (ediff-recenter) | |
272 | )) | |
273 | ||
274 | (defun ediff-shrink-window-C (arg) | |
275 | "Shrink window C to just one line. | |
276 | With a prefix argument, returns window C to its normal size. | |
277 | Used only for merging jobs." | |
278 | (interactive "P") | |
279 | (if (not ediff-merge-job) | |
280 | (error "ediff-shrink-window-C can be used only for merging jobs")) | |
281 | (cond ((eq arg '-) (setq arg -1)) | |
282 | ((not (numberp arg)) (setq arg nil))) | |
283 | (cond ((null arg) | |
284 | (let ((ediff-merge-window-share | |
285 | (if (< (window-height ediff-window-C) 3) | |
286 | ediff-merge-window-share 0))) | |
287 | (setq ediff-window-config-saved "") ; force redisplay | |
288 | (ediff-recenter 'no-rehighlight))) | |
289 | ((and (< arg 0) (> (window-height ediff-window-C) 2)) | |
290 | (setq ediff-merge-window-share (* ediff-merge-window-share 0.9)) | |
291 | (setq ediff-window-config-saved "") ; force redisplay | |
292 | (ediff-recenter 'no-rehighlight)) | |
293 | ((and (> arg 0) (> (window-height ediff-window-A) 2)) | |
294 | (setq ediff-merge-window-share (* ediff-merge-window-share 1.1)) | |
295 | (setq ediff-window-config-saved "") ; force redisplay | |
296 | (ediff-recenter 'no-rehighlight)))) | |
297 | ||
298 | ||
3af0304a | 299 | ;; N here is the user's region number. It is 1+ what Ediff uses internally. |
475f9031 KH |
300 | (defun ediff-combine-diffs (n &optional batch-invocation) |
301 | "Combine Nth diff regions of buffers A and B and place the combination in C. | |
3af0304a | 302 | N is a prefix argument. If nil, combine the current difference regions. |
4ae69eac MK |
303 | Combining is done according to the specifications in variable |
304 | `ediff-combination-pattern'." | |
475f9031 | 305 | (interactive "P") |
4ae69eac | 306 | (setq n (if (numberp n) (1- n) ediff-current-difference)) |
475f9031 KH |
307 | |
308 | (let (regA regB reg-combined) | |
086171bf MK |
309 | ;;(setq regA (ediff-get-region-contents n 'A ediff-control-buffer) |
310 | ;; regB (ediff-get-region-contents n 'B ediff-control-buffer)) | |
311 | ;;(setq reg-combined (ediff-make-combined-diff regA regB)) | |
312 | (setq reg-combined (ediff-get-combined-region n)) | |
475f9031 KH |
313 | |
314 | (ediff-copy-diff n nil 'C batch-invocation reg-combined)) | |
4ae69eac | 315 | (or batch-invocation (ediff-jump-to-difference (1+ n)))) |
475f9031 | 316 | |
475f9031 KH |
317 | |
318 | ;; Checks if the region in buff C looks like a combination of the regions | |
3af0304a | 319 | ;; in buffers A and B. Return a list (reg-a-beg reg-a-end reg-b-beg reg-b-end) |
086171bf MK |
320 | ;; These refer to where the delimiters for region A, B, Ancestor start and end |
321 | ;; in buffer C | |
475f9031 KH |
322 | (defun ediff-looks-like-combined-merge (region-num) |
323 | (if ediff-merge-job | |
324 | (let ((combined (string-match (regexp-quote "(A+B)") | |
325 | (or (ediff-get-state-of-diff region-num 'C) | |
326 | ""))) | |
086171bf MK |
327 | (mrgreg-beg (ediff-get-diff-posn 'C 'beg region-num)) |
328 | (mrgreg-end (ediff-get-diff-posn 'C 'end region-num)) | |
329 | (pattern-list ediff-combination-pattern) | |
330 | delim reg-beg reg-end delim-regs-list) | |
475f9031 KH |
331 | |
332 | (if combined | |
e756eb9f | 333 | (ediff-with-current-buffer ediff-buffer-C |
086171bf MK |
334 | (while pattern-list |
335 | (goto-char mrgreg-beg) | |
336 | (setq delim (nth 0 pattern-list)) | |
337 | (search-forward delim mrgreg-end 'noerror) | |
338 | (setq reg-beg (match-beginning 0)) | |
339 | (setq reg-end (match-end 0)) | |
340 | (if (and reg-beg reg-end) | |
341 | (setq delim-regs-list | |
342 | ;; in reverse | |
343 | (cons reg-end (cons reg-beg delim-regs-list)))) | |
344 | (if (> (length pattern-list) 1) | |
345 | (setq pattern-list (cdr (cdr pattern-list))) | |
346 | (setq pattern-list nil)) | |
347 | ))) | |
348 | ||
349 | (reverse delim-regs-list) | |
475f9031 | 350 | ))) |
086171bf | 351 | |
3af0304a MK |
352 | |
353 | ;; Check if the non-preferred merge has been modified since originally set. | |
354 | ;; This affects only the regions that are marked as default-A/B or combined. | |
355 | ;; If PREFERS-TOO is non-nil, then look at the regions marked as prefers-A/B as | |
356 | ;; well. | |
357 | (defun ediff-merge-changed-from-default-p (diff-num &optional prefers-too) | |
358 | (let ((reg-A (ediff-get-region-contents diff-num 'A ediff-control-buffer)) | |
359 | (reg-B (ediff-get-region-contents diff-num 'B ediff-control-buffer)) | |
360 | (reg-C (ediff-get-region-contents diff-num 'C ediff-control-buffer))) | |
361 | ||
362 | (setq state-of-merge (ediff-get-state-of-merge diff-num)) | |
363 | ||
364 | ;; if region was edited since it was first set by default | |
365 | (or (and (string= state-of-merge "default-A") | |
366 | (not (string= reg-A reg-C))) | |
367 | (and (string= state-of-merge "default-B") | |
368 | (not (string= reg-B reg-C))) | |
369 | (and (string= state-of-merge "combined") | |
086171bf MK |
370 | ;;(not (string= (ediff-make-combined-diff reg-A reg-B) reg-C))) |
371 | (not (string= (ediff-get-combined-region diff-num) reg-C))) | |
3af0304a MK |
372 | (and prefers-too |
373 | (string= state-of-merge "prefer-A") | |
374 | (not (string= reg-A reg-C))) | |
375 | (and prefers-too | |
376 | (string= state-of-merge "prefer-B") | |
377 | (not (string= reg-B reg-C))) | |
378 | ))) | |
475f9031 KH |
379 | |
380 | ||
92c51e07 MK |
381 | ;;; Local Variables: |
382 | ;;; eval: (put 'ediff-defvar-local 'lisp-indent-hook 'defun) | |
e756eb9f MK |
383 | ;;; eval: (put 'ediff-with-current-buffer 'lisp-indent-hook 1) |
384 | ;;; eval: (put 'ediff-with-current-buffer 'edebug-form-spec '(form body)) | |
92c51e07 MK |
385 | ;;; End: |
386 | ||
475f9031 | 387 | ;; ediff-merg.el ends here |