1 ;;; ediff-merg.el --- merging utilities
3 ;; Copyright (C) 1994, 1995, 1996, 1997 Free Software Foundation, Inc.
5 ;; Author: Michael Kifer <kifer@cs.sunysb.edu>
7 ;; This file is part of GNU Emacs.
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)
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.
19 ;; You should have received a copy of the GNU General Public License
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.
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
)
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
))
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."
53 (defcustom ediff-default-variant
'combined
54 "*The variant to be used as a default for buffer C in merging.
55 Valid values are the symbols `default-A', `default-B', and `combined'."
56 :type
'(radio (const default-A
) (const default-B
) (const combined
))
59 (defcustom ediff-combination-pattern
60 '("<<<<<<<<<<<<<< variant A" ">>>>>>>>>>>>>> variant B" "======= end of combination")
61 "*Pattern to be used for combining difference regions in buffers A and B.
62 The value is (STRING1 STRING2 STRING3). The combined text will look like this:
65 diff region from variant A
67 diff region from variant B
70 :type
'(list string string string
)
73 (ediff-defvar-local ediff-show-clashes-only nil
74 "*If t, show only those diff regions where both buffers disagree with the ancestor.
75 This means that regions that have status prefer-A or prefer-B will be
76 skiped over. Nil means show all regions.")
78 ;; If ediff-show-clashes-only, check if there is no clash between the ancestor
79 ;; and one of the variants.
80 (defsubst ediff-merge-region-is-non-clash
(n)
81 (and ediff-show-clashes-only
82 (string-match "prefer" (or (ediff-get-state-of-merge n
) ""))))
85 (defsubst ediff-get-combined-region
(n)
86 (concat (nth 0 ediff-combination-pattern
) "\n"
87 (ediff-get-region-contents n
'A ediff-control-buffer
)
88 (nth 1 ediff-combination-pattern
) "\n"
89 (ediff-get-region-contents n
'B ediff-control-buffer
)
90 (nth 2 ediff-combination-pattern
) "\n"))
92 (defsubst ediff-make-combined-diff
(regA regB
)
93 (concat (nth 0 ediff-combination-pattern
) "\n"
95 (nth 1 ediff-combination-pattern
) "\n"
97 (nth 2 ediff-combination-pattern
) "\n"))
99 (defsubst ediff-set-state-of-all-diffs-in-all-buffers
(ctl-buf)
101 (while (< n ediff-number-of-differences
)
102 (ediff-set-state-of-diff-in-all-buffers n ctl-buf
)
105 (defun ediff-set-state-of-diff-in-all-buffers (n ctl-buf
)
106 (let ((regA (ediff-get-region-contents n
'A ctl-buf
))
107 (regB (ediff-get-region-contents n
'B ctl-buf
))
108 (regC (ediff-get-region-contents n
'C ctl-buf
)))
109 (cond ((and (string= regA regB
) (string= regA regC
))
110 (ediff-set-state-of-diff n
'A
"=diff(B)")
111 (ediff-set-state-of-diff n
'B
"=diff(C)")
112 (ediff-set-state-of-diff n
'C
"=diff(A)"))
114 (ediff-set-state-of-diff n
'A
"=diff(B)")
115 (ediff-set-state-of-diff n
'B
"=diff(A)")
116 (ediff-set-state-of-diff n
'C nil
))
118 (ediff-set-state-of-diff n
'A
"=diff(C)")
119 (ediff-set-state-of-diff n
'C
"=diff(A)")
120 (ediff-set-state-of-diff n
'B nil
))
122 (ediff-set-state-of-diff n
'C
"=diff(B)")
123 (ediff-set-state-of-diff n
'B
"=diff(C)")
124 (ediff-set-state-of-diff n
'A nil
))
125 ((string= regC
(ediff-get-combined-region n
))
126 (ediff-set-state-of-diff n
'A nil
)
127 (ediff-set-state-of-diff n
'B nil
)
128 (ediff-set-state-of-diff n
'C
"=diff(A+B)"))
129 (t (ediff-set-state-of-diff n
'A nil
)
130 (ediff-set-state-of-diff n
'B nil
)
131 (ediff-set-state-of-diff n
'C nil
)))
134 (defun ediff-set-merge-mode ()
136 (remove-hook 'local-write-file-hooks
'ediff-set-merge-mode
))
139 ;; Go over all diffs starting with DIFF-NUM and copy regions into buffer C
140 ;; according to the state of the difference.
141 ;; Since ediff-copy-diff refuses to copy identical diff regions, there is
142 ;; no need to optimize ediff-do-merge any further.
144 ;; If re-merging, change state of merge in all diffs starting with
145 ;; DIFF-NUM, except those where the state is prefer-* or where it is
146 ;; `default-*' or `combined' but the buf C region appears to be modified
147 ;; since last set by default.
148 (defun ediff-do-merge (diff-num &optional remerging
)
149 (if (< diff-num
0) (setq diff-num
0))
151 ;;(default-state-of-merge (format "%S" ediff-default-variant))
152 do-not-copy state-of-merge
)
153 (while (< n ediff-number-of-differences
)
154 (setq do-not-copy nil
) ; reset after each cycle
156 (message "%s buffers A & B into C ... region %d of %d"
157 (if remerging
"Re-merging" "Merging")
159 ediff-number-of-differences
))
161 (setq state-of-merge
(ediff-get-state-of-merge n
))
164 (let ((reg-A (ediff-get-region-contents n
'A ediff-control-buffer
))
165 (reg-B (ediff-get-region-contents n
'B ediff-control-buffer
))
166 (reg-C (ediff-get-region-contents n
'C ediff-control-buffer
)))
168 ;; if region was edited since it was first set by default
169 (if (or (and (string= state-of-merge
"default-A")
170 (not (string= reg-A reg-C
)))
171 ;; was edited since first set by default
172 (and (string= state-of-merge
"default-B")
173 (not (string= reg-B reg-C
)))
174 ;; was edited since first set by default
175 (and (string= state-of-merge
"combined")
177 (ediff-make-combined-diff reg-A reg-B
) reg-C
)))
178 ;; was preferred--ignore
179 (string-match "prefer" state-of-merge
))
180 (setq do-not-copy t
))
182 ;; change state of merge for this diff, if necessary
183 (if (and (string-match "\\(default\\|combined\\)" state-of-merge
)
185 (ediff-set-state-of-merge
186 n
(format "%S" ediff-default-variant
)))
189 ;; state-of-merge may have changed via ediff-set-state-of-merge, so
190 ;; check it once again
191 (setq state-of-merge
(ediff-get-state-of-merge n
))
194 (if (string= state-of-merge
"combined")
195 ;; use n+1 because ediff-combine-diffs works via user numbering
196 ;; of diffs, which is 1+ to what ediff uses internally
197 (ediff-combine-diffs (1+ n
) 'batch
)
199 n
(if (string-match "-A" state-of-merge
) 'A
'B
) 'C
'batch
)))
201 (message "Merging buffers A & B into C ... Done")
205 (defun ediff-re-merge ()
206 "Remerge unmodified diff regions using a new default. Start with the current region."
208 (let* ((default-variant-alist
209 (list '("default-A") '("default-B") '("combined")))
211 (delete (list (symbol-name ediff-default-variant
))
212 default-variant-alist
)))
213 (setq ediff-default-variant
216 (format "Current merge default is `%S'. New default: "
217 ediff-default-variant
)
218 actual-alist nil
'must-match
)))
219 (ediff-do-merge ediff-current-difference
'remerge
)
223 (defun ediff-shrink-window-C (arg)
224 "Shrink window C to just one line.
225 With a prefix argument, returns window C to its normal size.
226 Used only for merging jobs."
228 (if (not ediff-merge-job
)
229 (error "ediff-shrink-window-C can be used only for merging jobs"))
230 (cond ((eq arg
'-
) (setq arg -
1))
231 ((not (numberp arg
)) (setq arg nil
)))
233 (let ((ediff-merge-window-share
234 (if (< (window-height ediff-window-C
) 3)
235 ediff-merge-window-share
0)))
236 (setq ediff-window-config-saved
"") ; force redisplay
237 (ediff-recenter 'no-rehighlight
)))
238 ((and (< arg
0) (> (window-height ediff-window-C
) 2))
239 (setq ediff-merge-window-share
(* ediff-merge-window-share
0.9))
240 (setq ediff-window-config-saved
"") ; force redisplay
241 (ediff-recenter 'no-rehighlight
))
242 ((and (> arg
0) (> (window-height ediff-window-A
) 2))
243 (setq ediff-merge-window-share
(* ediff-merge-window-share
1.1))
244 (setq ediff-window-config-saved
"") ; force redisplay
245 (ediff-recenter 'no-rehighlight
))))
248 ;; N here is the user's region number. It is 1+ what Ediff uses internally.
249 (defun ediff-combine-diffs (n &optional batch-invocation
)
250 "Combine Nth diff regions of buffers A and B and place the combination in C.
251 N is a prefix argument. If nil, combine the current difference regions.
252 Combining is done according to the specifications in variable
253 `ediff-combination-pattern'."
255 (setq n
(if (numberp n
) (1- n
) ediff-current-difference
))
257 (let (regA regB reg-combined
)
258 (setq regA
(ediff-get-region-contents n
'A ediff-control-buffer
)
259 regB
(ediff-get-region-contents n
'B ediff-control-buffer
))
261 (setq reg-combined
(ediff-make-combined-diff regA regB
))
263 (ediff-copy-diff n nil
'C batch-invocation reg-combined
))
264 (or batch-invocation
(ediff-jump-to-difference (1+ n
))))
267 ;; Checks if the region in buff C looks like a combination of the regions
268 ;; in buffers A and B. Returns a list (reg-a-beg reg-a-end reg-b-beg reg-b-end)
269 ;; These refer to where the copies of region A and B start and end in buffer C
270 (defun ediff-looks-like-combined-merge (region-num)
272 (let ((combined (string-match (regexp-quote "(A+B)")
273 (or (ediff-get-state-of-diff region-num
'C
)
275 (reg-beg (ediff-get-diff-posn 'C
'beg region-num
))
276 (reg-end (ediff-get-diff-posn 'C
'end region-num
))
277 (pat1 (nth 0 ediff-combination-pattern
))
278 (pat2 (nth 1 ediff-combination-pattern
))
279 (pat3 (nth 2 ediff-combination-pattern
))
280 reg-a-beg reg-a-end reg-b-beg reg-b-end reg-c-beg reg-c-end
)
283 (ediff-with-current-buffer ediff-buffer-C
285 (search-forward pat1 reg-end
'noerror
)
286 (setq reg-a-beg
(match-beginning 0))
287 (setq reg-a-end
(match-end 0))
288 (search-forward pat2 reg-end
'noerror
)
289 (setq reg-b-beg
(match-beginning 0))
290 (setq reg-b-end
(match-end 0))
291 (search-forward pat3 reg-end
'noerror
)
292 (setq reg-c-beg
(match-beginning 0))
293 (setq reg-c-end
(match-end 0))))
295 (if (and reg-a-beg reg-a-end reg-b-beg reg-b-end
)
296 (list reg-a-beg reg-a-end reg-b-beg reg-b-end reg-c-beg reg-c-end
))
301 ;;; eval: (put 'ediff-defvar-local 'lisp-indent-hook 'defun)
302 ;;; eval: (put 'ediff-with-current-buffer 'lisp-indent-hook 1)
303 ;;; eval: (put 'ediff-with-current-buffer 'edebug-form-spec '(form body))
306 ;; ediff-merg.el ends here