1#!/bin/sh
2#
3# This program resolves merge conflicts in git
4#
5# Copyright (c) 2006 Theodore Y. Ts'o
6#
7# This file is licensed under the GPL v2, or a later version
8# at the discretion of Junio C Hamano.
9#
10
11USAGE='[--tool=tool] [-y|--no-prompt|--prompt] [file to merge] ...'
12SUBDIRECTORY_OK=Yes
13OPTIONS_SPEC=
14. git-sh-setup
15require_work_tree
16prefix=$(git rev-parse --show-prefix)
17
18# Returns true if the mode reflects a symlink
19is_symlink () {
20 test "$1" = 120000
21}
22
23local_present () {
24 test -n "$local_mode"
25}
26
27remote_present () {
28 test -n "$remote_mode"
29}
30
31base_present () {
32 test -n "$base_mode"
33}
34
35cleanup_temp_files () {
36 if test "$1" = --save-backup ; then
37 mv -- "$BACKUP" "$MERGED.orig"
38 rm -f -- "$LOCAL" "$REMOTE" "$BASE"
39 else
40 rm -f -- "$LOCAL" "$REMOTE" "$BASE" "$BACKUP"
41 fi
42}
43
44describe_file () {
45 mode="$1"
46 branch="$2"
47 file="$3"
48
49 printf " {%s}: " "$branch"
50 if test -z "$mode"; then
51 echo "deleted"
52 elif is_symlink "$mode" ; then
53 echo "a symbolic link -> '$(cat "$file")'"
54 else
55 if base_present; then
56 echo "modified"
57 else
58 echo "created"
59 fi
60 fi
61}
62
63
64resolve_symlink_merge () {
65 while true; do
66 printf "Use (l)ocal or (r)emote, or (a)bort? "
67 read ans
68 case "$ans" in
69 [lL]*)
70 git checkout-index -f --stage=2 -- "$MERGED"
71 git add -- "$MERGED"
72 cleanup_temp_files --save-backup
73 return 0
74 ;;
75 [rR]*)
76 git checkout-index -f --stage=3 -- "$MERGED"
77 git add -- "$MERGED"
78 cleanup_temp_files --save-backup
79 return 0
80 ;;
81 [aA]*)
82 return 1
83 ;;
84 esac
85 done
86}
87
88resolve_deleted_merge () {
89 while true; do
90 if base_present; then
91 printf "Use (m)odified or (d)eleted file, or (a)bort? "
92 else
93 printf "Use (c)reated or (d)eleted file, or (a)bort? "
94 fi
95 read ans
96 case "$ans" in
97 [mMcC]*)
98 git add -- "$MERGED"
99 cleanup_temp_files --save-backup
100 return 0
101 ;;
102 [dD]*)
103 git rm -- "$MERGED" > /dev/null
104 cleanup_temp_files
105 return 0
106 ;;
107 [aA]*)
108 return 1
109 ;;
110 esac
111 done
112}
113
114check_unchanged () {
115 if test "$MERGED" -nt "$BACKUP" ; then
116 status=0;
117 else
118 while true; do
119 echo "$MERGED seems unchanged."
120 printf "Was the merge successful? [y/n] "
121 read answer < /dev/tty
122 case "$answer" in
123 y*|Y*) status=0; break ;;
124 n*|N*) status=1; break ;;
125 esac
126 done
127 fi
128}
129
130merge_file () {
131 MERGED="$1"
132
133 f=`git ls-files -u -- "$MERGED"`
134 if test -z "$f" ; then
135 if test ! -f "$MERGED" ; then
136 echo "$MERGED: file not found"
137 else
138 echo "$MERGED: file does not need merging"
139 fi
140 return 1
141 fi
142
143 ext="$$$(expr "$MERGED" : '.*\(\.[^/]*\)$')"
144 BACKUP="./$MERGED.BACKUP.$ext"
145 LOCAL="./$MERGED.LOCAL.$ext"
146 REMOTE="./$MERGED.REMOTE.$ext"
147 BASE="./$MERGED.BASE.$ext"
148
149 mv -- "$MERGED" "$BACKUP"
150 cp -- "$BACKUP" "$MERGED"
151
152 base_mode=`git ls-files -u -- "$MERGED" | awk '{if ($3==1) print $1;}'`
153 local_mode=`git ls-files -u -- "$MERGED" | awk '{if ($3==2) print $1;}'`
154 remote_mode=`git ls-files -u -- "$MERGED" | awk '{if ($3==3) print $1;}'`
155
156 base_present && git cat-file blob ":1:$prefix$MERGED" >"$BASE" 2>/dev/null
157 local_present && git cat-file blob ":2:$prefix$MERGED" >"$LOCAL" 2>/dev/null
158 remote_present && git cat-file blob ":3:$prefix$MERGED" >"$REMOTE" 2>/dev/null
159
160 if test -z "$local_mode" -o -z "$remote_mode"; then
161 echo "Deleted merge conflict for '$MERGED':"
162 describe_file "$local_mode" "local" "$LOCAL"
163 describe_file "$remote_mode" "remote" "$REMOTE"
164 resolve_deleted_merge
165 return
166 fi
167
168 if is_symlink "$local_mode" || is_symlink "$remote_mode"; then
169 echo "Symbolic link merge conflict for '$MERGED':"
170 describe_file "$local_mode" "local" "$LOCAL"
171 describe_file "$remote_mode" "remote" "$REMOTE"
172 resolve_symlink_merge
173 return
174 fi
175
176 echo "Normal merge conflict for '$MERGED':"
177 describe_file "$local_mode" "local" "$LOCAL"
178 describe_file "$remote_mode" "remote" "$REMOTE"
179 if "$prompt" = true; then
180 printf "Hit return to start merge resolution tool (%s): " "$merge_tool"
181 read ans
182 fi
183
184 case "$merge_tool" in
185 kdiff3)
186 if base_present ; then
187 ("$merge_tool_path" --auto --L1 "$MERGED (Base)" --L2 "$MERGED (Local)" --L3 "$MERGED (Remote)" \
188 -o "$MERGED" "$BASE" "$LOCAL" "$REMOTE" > /dev/null 2>&1)
189 else
190 ("$merge_tool_path" --auto --L1 "$MERGED (Local)" --L2 "$MERGED (Remote)" \
191 -o "$MERGED" "$LOCAL" "$REMOTE" > /dev/null 2>&1)
192 fi
193 status=$?
194 ;;
195 tkdiff)
196 if base_present ; then
197 "$merge_tool_path" -a "$BASE" -o "$MERGED" "$LOCAL" "$REMOTE"
198 else
199 "$merge_tool_path" -o "$MERGED" "$LOCAL" "$REMOTE"
200 fi
201 status=$?
202 ;;
203 meld|vimdiff)
204 touch "$BACKUP"
205 "$merge_tool_path" "$LOCAL" "$MERGED" "$REMOTE"
206 check_unchanged
207 ;;
208 gvimdiff)
209 touch "$BACKUP"
210 "$merge_tool_path" -f "$LOCAL" "$MERGED" "$REMOTE"
211 check_unchanged
212 ;;
213 xxdiff)
214 touch "$BACKUP"
215 if base_present ; then
216 "$merge_tool_path" -X --show-merged-pane \
217 -R 'Accel.SaveAsMerged: "Ctrl-S"' \
218 -R 'Accel.Search: "Ctrl+F"' \
219 -R 'Accel.SearchForward: "Ctrl-G"' \
220 --merged-file "$MERGED" "$LOCAL" "$BASE" "$REMOTE"
221 else
222 "$merge_tool_path" -X --show-merged-pane \
223 -R 'Accel.SaveAsMerged: "Ctrl-S"' \
224 -R 'Accel.Search: "Ctrl+F"' \
225 -R 'Accel.SearchForward: "Ctrl-G"' \
226 --merged-file "$MERGED" "$LOCAL" "$REMOTE"
227 fi
228 check_unchanged
229 ;;
230 opendiff)
231 touch "$BACKUP"
232 if base_present; then
233 "$merge_tool_path" "$LOCAL" "$REMOTE" -ancestor "$BASE" -merge "$MERGED" | cat
234 else
235 "$merge_tool_path" "$LOCAL" "$REMOTE" -merge "$MERGED" | cat
236 fi
237 check_unchanged
238 ;;
239 ecmerge)
240 touch "$BACKUP"
241 if base_present; then
242 "$merge_tool_path" "$BASE" "$LOCAL" "$REMOTE" --default --mode=merge3 --to="$MERGED"
243 else
244 "$merge_tool_path" "$LOCAL" "$REMOTE" --default --mode=merge2 --to="$MERGED"
245 fi
246 check_unchanged
247 ;;
248 emerge)
249 if base_present ; then
250 "$merge_tool_path" -f emerge-files-with-ancestor-command "$LOCAL" "$REMOTE" "$BASE" "$(basename "$MERGED")"
251 else
252 "$merge_tool_path" -f emerge-files-command "$LOCAL" "$REMOTE" "$(basename "$MERGED")"
253 fi
254 status=$?
255 ;;
256 *)
257 if test -n "$merge_tool_cmd"; then
258 if test "$merge_tool_trust_exit_code" = "false"; then
259 touch "$BACKUP"
260 ( eval $merge_tool_cmd )
261 check_unchanged
262 else
263 ( eval $merge_tool_cmd )
264 status=$?
265 fi
266 fi
267 ;;
268 esac
269 if test "$status" -ne 0; then
270 echo "merge of $MERGED failed" 1>&2
271 mv -- "$BACKUP" "$MERGED"
272
273 if test "$merge_keep_temporaries" = "false"; then
274 cleanup_temp_files
275 fi
276
277 return 1
278 fi
279
280 if test "$merge_keep_backup" = "true"; then
281 mv -- "$BACKUP" "$MERGED.orig"
282 else
283 rm -- "$BACKUP"
284 fi
285
286 git add -- "$MERGED"
287 cleanup_temp_files
288 return 0
289}
290
291prompt=$(git config --bool mergetool.prompt || echo true)
292
293while test $# != 0
294do
295 case "$1" in
296 -t|--tool*)
297 case "$#,$1" in
298 *,*=*)
299 merge_tool=`expr "z$1" : 'z-[^=]*=\(.*\)'`
300 ;;
301 1,*)
302 usage ;;
303 *)
304 merge_tool="$2"
305 shift ;;
306 esac
307 ;;
308 -y|--no-prompt)
309 prompt=false
310 ;;
311 --prompt)
312 prompt=true
313 ;;
314 --)
315 break
316 ;;
317 -*)
318 usage
319 ;;
320 *)
321 break
322 ;;
323 esac
324 shift
325done
326
327valid_custom_tool()
328{
329 merge_tool_cmd="$(git config mergetool.$1.cmd)"
330 test -n "$merge_tool_cmd"
331}
332
333valid_tool() {
334 case "$1" in
335 kdiff3 | tkdiff | xxdiff | meld | opendiff | emerge | vimdiff | gvimdiff | ecmerge)
336 ;; # happy
337 *)
338 if ! valid_custom_tool "$1"; then
339 return 1
340 fi
341 ;;
342 esac
343}
344
345init_merge_tool_path() {
346 merge_tool_path=`git config mergetool.$1.path`
347 if test -z "$merge_tool_path" ; then
348 case "$1" in
349 emerge)
350 merge_tool_path=emacs
351 ;;
352 *)
353 merge_tool_path=$1
354 ;;
355 esac
356 fi
357}
358
359prompt_after_failed_merge() {
360 while true; do
361 printf "Continue merging other unresolved paths (y/n) ? "
362 read ans
363 case "$ans" in
364
365 [yY]*)
366 return 0
367 ;;
368
369 [nN]*)
370 return 1
371 ;;
372 esac
373 done
374}
375
376if test -z "$merge_tool"; then
377 merge_tool=`git config merge.tool`
378 if test -n "$merge_tool" && ! valid_tool "$merge_tool"; then
379 echo >&2 "git config option merge.tool set to unknown tool: $merge_tool"
380 echo >&2 "Resetting to default..."
381 unset merge_tool
382 fi
383fi
384
385if test -z "$merge_tool" ; then
386 if test -n "$DISPLAY"; then
387 merge_tool_candidates="kdiff3 tkdiff xxdiff meld gvimdiff"
388 if test -n "$GNOME_DESKTOP_SESSION_ID" ; then
389 merge_tool_candidates="meld $merge_tool_candidates"
390 fi
391 if test "$KDE_FULL_SESSION" = "true"; then
392 merge_tool_candidates="kdiff3 $merge_tool_candidates"
393 fi
394 fi
395 if echo "${VISUAL:-$EDITOR}" | grep 'emacs' > /dev/null 2>&1; then
396 merge_tool_candidates="$merge_tool_candidates emerge"
397 fi
398 if echo "${VISUAL:-$EDITOR}" | grep 'vim' > /dev/null 2>&1; then
399 merge_tool_candidates="$merge_tool_candidates vimdiff"
400 fi
401 merge_tool_candidates="$merge_tool_candidates opendiff emerge vimdiff"
402 echo "merge tool candidates: $merge_tool_candidates"
403 for i in $merge_tool_candidates; do
404 init_merge_tool_path $i
405 if type "$merge_tool_path" > /dev/null 2>&1; then
406 merge_tool=$i
407 break
408 fi
409 done
410 if test -z "$merge_tool" ; then
411 echo "No known merge resolution program available."
412 exit 1
413 fi
414else
415 if ! valid_tool "$merge_tool"; then
416 echo >&2 "Unknown merge_tool $merge_tool"
417 exit 1
418 fi
419
420 init_merge_tool_path "$merge_tool"
421
422 merge_keep_backup="$(git config --bool merge.keepBackup || echo true)"
423 merge_keep_temporaries="$(git config --bool mergetool.keepTemporaries || echo false)"
424
425 if test -z "$merge_tool_cmd" && ! type "$merge_tool_path" > /dev/null 2>&1; then
426 echo "The merge tool $merge_tool is not available as '$merge_tool_path'"
427 exit 1
428 fi
429
430 if ! test -z "$merge_tool_cmd"; then
431 merge_tool_trust_exit_code="$(git config --bool mergetool.$merge_tool.trustExitCode || echo false)"
432 fi
433fi
434
435last_status=0
436rollup_status=0
437
438if test $# -eq 0 ; then
439 files=`git ls-files -u | sed -e 's/^[^ ]* //' | sort -u`
440 if test -z "$files" ; then
441 echo "No files need merging"
442 exit 0
443 fi
444 echo Merging the files: "$files"
445 git ls-files -u |
446 sed -e 's/^[^ ]* //' |
447 sort -u |
448 while IFS= read i
449 do
450 if test $last_status -ne 0; then
451 prompt_after_failed_merge < /dev/tty || exit 1
452 fi
453 printf "\n"
454 merge_file "$i" < /dev/tty > /dev/tty
455 last_status=$?
456 if test $last_status -ne 0; then
457 rollup_status=1
458 fi
459 done
460else
461 while test $# -gt 0; do
462 if test $last_status -ne 0; then
463 prompt_after_failed_merge || exit 1
464 fi
465 printf "\n"
466 merge_file "$1"
467 last_status=$?
468 if test $last_status -ne 0; then
469 rollup_status=1
470 fi
471 shift
472 done
473fi
474
475exit $rollup_status