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emacs/lisp/ediff-merg.el
1995-04-07 01:20:53 +00:00

260 lines
9.5 KiB
EmacsLisp

;;; ediff-merg.el --- merging utilities
;;; Copyright (C) 1994, 1995 Free Software Foundation, Inc.
;; Author: Michael Kifer <kifer@cs.sunysb.edu>
;; This file is part of GNU Emacs.
;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to
;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
(require 'ediff-init)
(defvar ediff-default-variant 'default-A
"*The variant to be used as a default for buffer C in merging.
Valid values are the symbols `default-A', `default-B', and `combined'.")
(defvar ediff-combination-pattern
'("#ifdef NEW /* variant A */" "#else /* variant B */" "#endif /* NEW */")
"*Pattern to be used for combining difference regions in buffers A and B.
The value is (STRING1 STRING2 STRING3). The combined text will look like this:
STRING1
diff region from variant A
STRING2
diff region from variant B
STRING3
")
(ediff-defvar-local ediff-show-clashes-only nil
"*If t, show only those diff regions where both buffers disagree with the ancestor.
This means that regions that have status prefer-A or prefer-B will be
skiped over. Nil means show all regions.")
(defsubst ediff-get-combined-region (n)
(concat (nth 0 ediff-combination-pattern) "\n"
(ediff-get-region-contents n 'A ediff-control-buffer)
(nth 1 ediff-combination-pattern) "\n"
(ediff-get-region-contents n 'B ediff-control-buffer)
(nth 2 ediff-combination-pattern) "\n"))
(defsubst ediff-set-state-of-all-diffs-in-all-buffers (ctl-buf)
(let ((n 0))
(while (< n ediff-number-of-differences)
(ediff-set-state-of-diff-in-all-buffers n ctl-buf)
(setq n (1+ n)))))
(defun ediff-set-state-of-diff-in-all-buffers (n ctl-buf)
(let ((regA (ediff-get-region-contents n 'A ctl-buf))
(regB (ediff-get-region-contents n 'B ctl-buf))
(regC (ediff-get-region-contents n 'C ctl-buf)))
(cond ((string= regA regB)
(ediff-set-state-of-diff n 'A "=diff(B)")
(ediff-set-state-of-diff n 'B "=diff(A)")
(ediff-set-state-of-diff n 'C nil))
((string= regA regC)
(ediff-set-state-of-diff n 'A "=diff(C)")
(ediff-set-state-of-diff n 'C "=diff(A)")
(ediff-set-state-of-diff n 'B nil))
((string= regB regC)
(ediff-set-state-of-diff n 'C "=diff(B)")
(ediff-set-state-of-diff n 'B "=diff(C)")
(ediff-set-state-of-diff n 'A nil))
((string= regC (ediff-get-combined-region n))
(ediff-set-state-of-diff n 'A nil)
(ediff-set-state-of-diff n 'B nil)
(ediff-set-state-of-diff n 'C "=diff(A+B)"))
(t (ediff-set-state-of-diff n 'A nil)
(ediff-set-state-of-diff n 'B nil)
(ediff-set-state-of-diff n 'C nil)))
))
;; Go over all diffs starting with DIFF-NUM and copy regions into buffer C
;; according to the state of the difference.
;; Since ediff-copy-diff refuses to copy identical diff regions, there is
;; no need to optimize ediff-do-merge any further.
;;
;; If re-merging, change state of merge in all diffs starting with
;; DIFF-NUM, except those where the state is prefer-* or where it is
;; default-* but the region appears to be modified with respect to its
;; original form.
;; Also, prevent copying when there is a danger of overriding a modified
;; region in buffer C.
(defun ediff-do-merge (diff-num &optional remerging)
(if (< diff-num 0) (setq diff-num 0))
(let ((n diff-num)
(default-state-of-merge (format "%S" ediff-default-variant))
do-not-copy
state-of-merge)
(while (< n ediff-number-of-differences)
(if (= (mod n 10) 0)
(message "%s buffers A & B into C ... region %d of %d"
(if remerging "Re-merging" "Merging")
n
ediff-number-of-differences))
(setq state-of-merge (ediff-get-state-of-merge n))
(setq do-not-copy (string= state-of-merge default-state-of-merge))
(if remerging
(let ((reg-A (ediff-get-region-contents n 'A ediff-control-buffer))
(reg-B (ediff-get-region-contents n 'B ediff-control-buffer))
(reg-C (ediff-get-region-contents n 'C ediff-control-buffer)))
(if (or
;; has been edited since it was first set by default
(and (string= state-of-merge "default-A")
(not (string= reg-A reg-C)))
;; has been edited since first set by default
(and (string= state-of-merge "default-B")
(not (string= reg-B reg-C)))
;; was prefered--ignore
(string-match "prefer" state-of-merge)
;; was combined--ignore
(string= state-of-merge "combined"))
(setq do-not-copy t))
;; change state of merge for this diff, if necessary
(if (and (string-match "default" state-of-merge) (not do-not-copy))
(ediff-set-state-of-merge
n (format "%S" ediff-default-variant)))
))
;; state-of-merge may have changed via ediff-set-state-of-merge, so
;; check it out again
(setq state-of-merge (ediff-get-state-of-merge n))
(or do-not-copy
(if (string= state-of-merge "combined")
;; use n+1 because ediff-combine-diffs works via user numbering
;; of diffs, which is 1+ to what ediff uses internally
(ediff-combine-diffs (1+ n) 'batch)
(ediff-copy-diff n
(if (string-match "-A" state-of-merge) 'A 'B)
'C
'batch)))
(setq n (1+ n)))
(message "Merging buffers A & B into C ... Done")
))
(defun ediff-re-merge ()
"Remerge unmodified diff regions using a new default. Start with the current region."
(interactive)
(let* ((default-variant-alist
(list '("default-A") '("default-B") '("combined")))
(actual-alist
(delete (list (symbol-name ediff-default-variant))
default-variant-alist)))
(setq ediff-default-variant
(intern
(completing-read
(format "Current merge default is `%S'. New default: "
ediff-default-variant)
actual-alist nil 'must-match)))
(ediff-do-merge ediff-current-difference 'remerge)
(ediff-recenter)
))
(defun ediff-shrink-window-C (arg)
"Shrink window C to just one line.
With a prefix argument, returns window C to its normal size.
Used only for merging jobs."
(interactive "P")
(if (not ediff-merge-job)
(error "ediff-shrink-window-C can be used only for merging jobs"))
(cond ((eq arg '-) (setq arg -1))
((not (numberp arg)) (setq arg nil)))
(cond ((null arg)
(let ((ediff-merge-window-share
(if (< (window-height ediff-window-C) 3)
ediff-merge-window-share 0)))
(setq ediff-window-config-saved "") ; force redisplay
(ediff-recenter 'no-rehighlight)))
((and (< arg 0) (> (window-height ediff-window-C) 2))
(setq ediff-merge-window-share (* ediff-merge-window-share 0.9))
(setq ediff-window-config-saved "") ; force redisplay
(ediff-recenter 'no-rehighlight))
((and (> arg 0) (> (window-height ediff-window-A) 2))
(setq ediff-merge-window-share (* ediff-merge-window-share 1.1))
(setq ediff-window-config-saved "") ; force redisplay
(ediff-recenter 'no-rehighlight))))
;; N here is the user's region number. It is 1+ what Ediff uses internally.
(defun ediff-combine-diffs (n &optional batch-invocation)
"Combine Nth diff regions of buffers A and B and place the combination in C.
Combining is done using the list in variable `ediff-combination-pattern'."
(interactive "P")
(setq n (if n (1- n) ediff-current-difference))
(let (regA regB reg-combined)
(setq regA (ediff-get-region-contents n 'A ediff-control-buffer)
regB (ediff-get-region-contents n 'B ediff-control-buffer))
(setq reg-combined (concat (nth 0 ediff-combination-pattern) "\n"
regA
(nth 1 ediff-combination-pattern) "\n"
regB
(nth 2 ediff-combination-pattern) "\n"))
(ediff-copy-diff n nil 'C batch-invocation reg-combined))
(or batch-invocation
(ediff-recenter 'no-rehighlight)))
;; Checks if the region in buff C looks like a combination of the regions
;; in buffers A and B. Returns a list (reg-a-beg reg-a-end reg-b-beg reg-b-end)
;; These refer to where the copies of region A and B start and end in buffer C
(defun ediff-looks-like-combined-merge (region-num)
(if ediff-merge-job
(let ((combined (string-match (regexp-quote "(A+B)")
(or (ediff-get-state-of-diff region-num 'C)
"")))
(reg-beg (ediff-get-diff-posn 'C 'beg region-num))
(reg-end (ediff-get-diff-posn 'C 'end region-num))
(pat1 (nth 0 ediff-combination-pattern))
(pat2 (nth 1 ediff-combination-pattern))
(pat3 (nth 2 ediff-combination-pattern))
reg-a-beg reg-a-end reg-b-beg reg-b-end reg-c-beg reg-c-end)
(if combined
(ediff-eval-in-buffer ediff-buffer-C
(goto-char reg-beg)
(search-forward pat1 reg-end 'noerror)
(setq reg-a-beg (match-beginning 0))
(setq reg-a-end (match-end 0))
(search-forward pat2 reg-end 'noerror)
(setq reg-b-beg (match-beginning 0))
(setq reg-b-end (match-end 0))
(search-forward pat3 reg-end 'noerror)
(setq reg-c-beg (match-beginning 0))
(setq reg-c-end (match-end 0))))
(if (and reg-a-beg reg-a-end reg-b-beg reg-b-end)
(list reg-a-beg reg-a-end reg-b-beg reg-b-end reg-c-beg reg-c-end))
)))
(provide 'ediff-merg)
;; ediff-merg.el ends here