git-merge: no reason to use cpio anymore
[git] / git-mergetool.sh
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
11 USAGE='[--tool=tool] [file to merge] ...'
12 SUBDIRECTORY_OK=Yes
13 . git-sh-setup
14 require_work_tree
15
16 # Returns true if the mode reflects a symlink
17 is_symlink () {
18     test "$1" = 120000
19 }
20
21 local_present () {
22     test -n "$local_mode"
23 }
24
25 remote_present () {
26     test -n "$remote_mode"
27 }
28
29 base_present () {
30     test -n "$base_mode"
31 }
32
33 cleanup_temp_files () {
34     if test "$1" = --save-backup ; then
35         mv -- "$BACKUP" "$path.orig"
36         rm -f -- "$LOCAL" "$REMOTE" "$BASE"
37     else
38         rm -f -- "$LOCAL" "$REMOTE" "$BASE" "$BACKUP"
39     fi
40 }
41
42 describe_file () {
43     mode="$1"
44     branch="$2"
45     file="$3"
46
47     printf "  {%s}: " "$branch"
48     if test -z "$mode"; then
49         echo "deleted"
50     elif is_symlink "$mode" ; then
51         echo "a symbolic link -> '$(cat "$file")'"
52     else
53         if base_present; then
54             echo "modified"
55         else
56             echo "created"
57         fi
58     fi
59 }
60
61
62 resolve_symlink_merge () {
63     while true; do
64         printf "Use (l)ocal or (r)emote, or (a)bort? "
65         read ans
66         case "$ans" in
67             [lL]*)
68                 git checkout-index -f --stage=2 -- "$path"
69                 git add -- "$path"
70                 cleanup_temp_files --save-backup
71                 return
72                 ;;
73             [rR]*)
74                 git checkout-index -f --stage=3 -- "$path"
75                 git add -- "$path"
76                 cleanup_temp_files --save-backup
77                 return
78                 ;;
79             [aA]*)
80                 exit 1
81                 ;;
82             esac
83         done
84 }
85
86 resolve_deleted_merge () {
87     while true; do
88         if base_present; then
89             printf "Use (m)odified or (d)eleted file, or (a)bort? "
90         else
91             printf "Use (c)reated or (d)eleted file, or (a)bort? "
92         fi
93         read ans
94         case "$ans" in
95             [mMcC]*)
96                 git add -- "$path"
97                 cleanup_temp_files --save-backup
98                 return
99                 ;;
100             [dD]*)
101                 git rm -- "$path" > /dev/null
102                 cleanup_temp_files
103                 return
104                 ;;
105             [aA]*)
106                 exit 1
107                 ;;
108             esac
109         done
110 }
111
112 check_unchanged () {
113     if test "$path" -nt "$BACKUP" ; then
114         status=0;
115     else
116         while true; do
117             echo "$path seems unchanged."
118             printf "Was the merge successful? [y/n] "
119             read answer < /dev/tty
120             case "$answer" in
121                 y*|Y*) status=0; break ;;
122                 n*|N*) status=1; break ;;
123             esac
124         done
125     fi
126 }
127
128 save_backup () {
129     if test "$status" -eq 0; then
130         mv -- "$BACKUP" "$path.orig"
131     fi
132 }
133
134 remove_backup () {
135     if test "$status" -eq 0; then
136         rm "$BACKUP"
137     fi
138 }
139
140 merge_file () {
141     path="$1"
142
143     f=`git ls-files -u -- "$path"`
144     if test -z "$f" ; then
145         if test ! -f "$path" ; then
146             echo "$path: file not found"
147         else
148             echo "$path: file does not need merging"
149         fi
150         exit 1
151     fi
152
153     BACKUP="$path.BACKUP.$$"
154     LOCAL="$path.LOCAL.$$"
155     REMOTE="$path.REMOTE.$$"
156     BASE="$path.BASE.$$"
157
158     mv -- "$path" "$BACKUP"
159     cp -- "$BACKUP" "$path"
160
161     base_mode=`git ls-files -u -- "$path" | awk '{if ($3==1) print $1;}'`
162     local_mode=`git ls-files -u -- "$path" | awk '{if ($3==2) print $1;}'`
163     remote_mode=`git ls-files -u -- "$path" | awk '{if ($3==3) print $1;}'`
164
165     base_present   && git cat-file blob ":1:$path" > "$BASE" 2>/dev/null
166     local_present  && git cat-file blob ":2:$path" > "$LOCAL" 2>/dev/null
167     remote_present && git cat-file blob ":3:$path" > "$REMOTE" 2>/dev/null
168
169     if test -z "$local_mode" -o -z "$remote_mode"; then
170         echo "Deleted merge conflict for '$path':"
171         describe_file "$local_mode" "local" "$LOCAL"
172         describe_file "$remote_mode" "remote" "$REMOTE"
173         resolve_deleted_merge
174         return
175     fi
176
177     if is_symlink "$local_mode" || is_symlink "$remote_mode"; then
178         echo "Symbolic link merge conflict for '$path':"
179         describe_file "$local_mode" "local" "$LOCAL"
180         describe_file "$remote_mode" "remote" "$REMOTE"
181         resolve_symlink_merge
182         return
183     fi
184
185     echo "Normal merge conflict for '$path':"
186     describe_file "$local_mode" "local" "$LOCAL"
187     describe_file "$remote_mode" "remote" "$REMOTE"
188     printf "Hit return to start merge resolution tool (%s): " "$merge_tool"
189     read ans
190
191     case "$merge_tool" in
192         kdiff3)
193             if base_present ; then
194                 (kdiff3 --auto --L1 "$path (Base)" -L2 "$path (Local)" --L3 "$path (Remote)" \
195                     -o "$path" -- "$BASE" "$LOCAL" "$REMOTE" > /dev/null 2>&1)
196             else
197                 (kdiff3 --auto -L1 "$path (Local)" --L2 "$path (Remote)" \
198                     -o "$path" -- "$LOCAL" "$REMOTE" > /dev/null 2>&1)
199             fi
200             status=$?
201             remove_backup
202             ;;
203         tkdiff)
204             if base_present ; then
205                 tkdiff -a "$BASE" -o "$path" -- "$LOCAL" "$REMOTE"
206             else
207                 tkdiff -o "$path" -- "$LOCAL" "$REMOTE"
208             fi
209             status=$?
210             save_backup
211             ;;
212         meld|vimdiff)
213             touch "$BACKUP"
214             $merge_tool -- "$LOCAL" "$path" "$REMOTE"
215             check_unchanged
216             save_backup
217             ;;
218         gvimdiff)
219                 touch "$BACKUP"
220                 gvimdiff -f -- "$LOCAL" "$path" "$REMOTE"
221                 check_unchanged
222                 save_backup
223                 ;;
224         xxdiff)
225             touch "$BACKUP"
226             if base_present ; then
227                 xxdiff -X --show-merged-pane \
228                     -R 'Accel.SaveAsMerged: "Ctrl-S"' \
229                     -R 'Accel.Search: "Ctrl+F"' \
230                     -R 'Accel.SearchForward: "Ctrl-G"' \
231                     --merged-file "$path" -- "$LOCAL" "$BASE" "$REMOTE"
232             else
233                 xxdiff -X --show-merged-pane \
234                     -R 'Accel.SaveAsMerged: "Ctrl-S"' \
235                     -R 'Accel.Search: "Ctrl+F"' \
236                     -R 'Accel.SearchForward: "Ctrl-G"' \
237                     --merged-file "$path" -- "$LOCAL" "$REMOTE"
238             fi
239             check_unchanged
240             save_backup
241             ;;
242         opendiff)
243             touch "$BACKUP"
244             if base_present; then
245                 opendiff "$LOCAL" "$REMOTE" -ancestor "$BASE" -merge "$path" | cat
246             else
247                 opendiff "$LOCAL" "$REMOTE" -merge "$path" | cat
248             fi
249             check_unchanged
250             save_backup
251             ;;
252         emerge)
253             if base_present ; then
254                 emacs -f emerge-files-with-ancestor-command "$LOCAL" "$REMOTE" "$BASE" "$path"
255             else
256                 emacs -f emerge-files-command "$LOCAL" "$REMOTE" "$path"
257             fi
258             status=$?
259             save_backup
260             ;;
261     esac
262     if test "$status" -ne 0; then
263         echo "merge of $path failed" 1>&2
264         mv -- "$BACKUP" "$path"
265         exit 1
266     fi
267     git add -- "$path"
268     cleanup_temp_files
269 }
270
271 while case $# in 0) break ;; esac
272 do
273     case "$1" in
274         -t|--tool*)
275             case "$#,$1" in
276                 *,*=*)
277                     merge_tool=`expr "z$1" : 'z-[^=]*=\(.*\)'`
278                     ;;
279                 1,*)
280                     usage ;;
281                 *)
282                     merge_tool="$2"
283                     shift ;;
284             esac
285             ;;
286         --)
287             break
288             ;;
289         -*)
290             usage
291             ;;
292         *)
293             break
294             ;;
295     esac
296     shift
297 done
298
299 if test -z "$merge_tool"; then
300     merge_tool=`git config merge.tool`
301     case "$merge_tool" in
302         kdiff3 | tkdiff | xxdiff | meld | opendiff | emerge | vimdiff | gvimdiff | "")
303             ;; # happy
304         *)
305             echo >&2 "git config option merge.tool set to unknown tool: $merge_tool"
306             echo >&2 "Resetting to default..."
307             unset merge_tool
308             ;;
309     esac
310 fi
311
312 if test -z "$merge_tool" ; then
313     if test -n "$DISPLAY"; then
314         merge_tool_candidates="kdiff3 tkdiff xxdiff meld gvimdiff"
315         if test -n "$GNOME_DESKTOP_SESSION_ID" ; then
316             merge_tool_candidates="meld $merge_tool_candidates"
317         fi
318         if test "$KDE_FULL_SESSION" = "true"; then
319             merge_tool_candidates="kdiff3 $merge_tool_candidates"
320         fi
321     fi
322     if echo "${VISUAL:-$EDITOR}" | grep 'emacs' > /dev/null 2>&1; then
323         merge_tool_candidates="$merge_tool_candidates emerge"
324     fi
325     if echo "${VISUAL:-$EDITOR}" | grep 'vim' > /dev/null 2>&1; then
326         merge_tool_candidates="$merge_tool_candidates vimdiff"
327     fi
328     merge_tool_candidates="$merge_tool_candidates opendiff emerge vimdiff"
329     echo "merge tool candidates: $merge_tool_candidates"
330     for i in $merge_tool_candidates; do
331         if test $i = emerge ; then
332             cmd=emacs
333         else
334             cmd=$i
335         fi
336         if type $cmd > /dev/null 2>&1; then
337             merge_tool=$i
338             break
339         fi
340     done
341     if test -z "$merge_tool" ; then
342         echo "No available merge resolution programs available."
343         exit 1
344     fi
345 fi
346
347 case "$merge_tool" in
348     kdiff3|tkdiff|meld|xxdiff|vimdiff|gvimdiff|opendiff)
349         if ! type "$merge_tool" > /dev/null 2>&1; then
350             echo "The merge tool $merge_tool is not available"
351             exit 1
352         fi
353         ;;
354     emerge)
355         if ! type "emacs" > /dev/null 2>&1; then
356             echo "Emacs is not available"
357             exit 1
358         fi
359         ;;
360     *)
361         echo "Unknown merge tool: $merge_tool"
362         exit 1
363         ;;
364 esac
365
366 if test $# -eq 0 ; then
367         files=`git ls-files -u | sed -e 's/^[^  ]*      //' | sort -u`
368         if test -z "$files" ; then
369                 echo "No files need merging"
370                 exit 0
371         fi
372         echo Merging the files: $files
373         git ls-files -u | sed -e 's/^[^ ]*      //' | sort -u | while read i
374         do
375                 printf "\n"
376                 merge_file "$i" < /dev/tty > /dev/tty
377         done
378 else
379         while test $# -gt 0; do
380                 printf "\n"
381                 merge_file "$1"
382                 shift
383         done
384 fi
385 exit 0