summaryrefslogtreecommitdiff
path: root/git-mergetool--lib.sh
blob: 51dd0d67ba951873df4f26b1707a1e8a713082b9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
#!/bin/sh
# git-mergetool--lib is a library for common merge tool functions
diff_mode() {
	test "$TOOL_MODE" = diff
}

merge_mode() {
	test "$TOOL_MODE" = merge
}

translate_merge_tool_path () {
	case "$1" in
	vimdiff)
		echo vim
		;;
	gvimdiff)
		echo gvim
		;;
	emerge)
		echo emacs
		;;
	araxis)
		echo compare
		;;
	*)
		echo "$1"
		;;
	esac
}

check_unchanged () {
	if test "$MERGED" -nt "$BACKUP"; then
		status=0
	else
		while true; do
			echo "$MERGED seems unchanged."
			printf "Was the merge successful? [y/n] "
			read answer < /dev/tty
			case "$answer" in
			y*|Y*) status=0; break ;;
			n*|N*) status=1; break ;;
			esac
		done
	fi
}

valid_tool () {
	case "$1" in
	kdiff3 | tkdiff | xxdiff | meld | opendiff | \
	emerge | vimdiff | gvimdiff | ecmerge | diffuse | araxis | p4merge)
		;; # happy
	tortoisemerge)
		if ! merge_mode; then
			return 1
		fi
		;;
	kompare)
		if ! diff_mode; then
			return 1
		fi
		;;
	*)
		if test -z "$(get_merge_tool_cmd "$1")"; then
			return 1
		fi
		;;
	esac
}

get_merge_tool_cmd () {
	# Prints the custom command for a merge tool
	if test -n "$1"; then
		merge_tool="$1"
	else
		merge_tool="$(get_merge_tool)"
	fi
	if diff_mode; then
		echo "$(git config difftool.$merge_tool.cmd ||
		        git config mergetool.$merge_tool.cmd)"
	else
		echo "$(git config mergetool.$merge_tool.cmd)"
	fi
}

run_merge_tool () {
	merge_tool_path="$(get_merge_tool_path "$1")" || exit
	base_present="$2"
	status=0

	case "$1" in
	kdiff3)
		if merge_mode; then
			if $base_present; then
				("$merge_tool_path" --auto \
					--L1 "$MERGED (Base)" \
					--L2 "$MERGED (Local)" \
					--L3 "$MERGED (Remote)" \
					-o "$MERGED" \
					"$BASE" "$LOCAL" "$REMOTE" \
				> /dev/null 2>&1)
			else
				("$merge_tool_path" --auto \
					--L1 "$MERGED (Local)" \
					--L2 "$MERGED (Remote)" \
					-o "$MERGED" \
					"$LOCAL" "$REMOTE" \
				> /dev/null 2>&1)
			fi
			status=$?
		else
			("$merge_tool_path" --auto \
				--L1 "$MERGED (A)" \
				--L2 "$MERGED (B)" "$LOCAL" "$REMOTE" \
			> /dev/null 2>&1)
		fi
		;;
	kompare)
		"$merge_tool_path" "$LOCAL" "$REMOTE"
		;;
	tkdiff)
		if merge_mode; then
			if $base_present; then
				"$merge_tool_path" -a "$BASE" \
					-o "$MERGED" "$LOCAL" "$REMOTE"
			else
				"$merge_tool_path" \
					-o "$MERGED" "$LOCAL" "$REMOTE"
			fi
			status=$?
		else
			"$merge_tool_path" "$LOCAL" "$REMOTE"
		fi
		;;
	p4merge)
		if merge_mode; then
		    touch "$BACKUP"
			if $base_present; then
				"$merge_tool_path" "$BASE" "$LOCAL" "$REMOTE" "$MERGED"
			else
				"$merge_tool_path" "$LOCAL" "$LOCAL" "$REMOTE" "$MERGED"
			fi
			check_unchanged
		else
			"$merge_tool_path" "$LOCAL" "$REMOTE"
		fi
		;;
	meld)
		if merge_mode; then
			touch "$BACKUP"
			"$merge_tool_path" "$LOCAL" "$MERGED" "$REMOTE"
			check_unchanged
		else
			"$merge_tool_path" "$LOCAL" "$REMOTE"
		fi
		;;
	diffuse)
		if merge_mode; then
			touch "$BACKUP"
			if $base_present; then
				"$merge_tool_path" \
					"$LOCAL" "$MERGED" "$REMOTE" \
					"$BASE" | cat
			else
				"$merge_tool_path" \
					"$LOCAL" "$MERGED" "$REMOTE" | cat
			fi
			check_unchanged
		else
			"$merge_tool_path" "$LOCAL" "$REMOTE" | cat
		fi
		;;
	vimdiff)
		if merge_mode; then
			touch "$BACKUP"
			"$merge_tool_path" -d -c "wincmd l" \
				"$LOCAL" "$MERGED" "$REMOTE"
			check_unchanged
		else
			"$merge_tool_path" -d -c "wincmd l" \
				"$LOCAL" "$REMOTE"
		fi
		;;
	gvimdiff)
		if merge_mode; then
			touch "$BACKUP"
			"$merge_tool_path" -d -c "wincmd l" -f \
				"$LOCAL" "$MERGED" "$REMOTE"
			check_unchanged
		else
			"$merge_tool_path" -d -c "wincmd l" -f \
				"$LOCAL" "$REMOTE"
		fi
		;;
	xxdiff)
		if merge_mode; then
			touch "$BACKUP"
			if $base_present; then
				"$merge_tool_path" -X --show-merged-pane \
					-R 'Accel.SaveAsMerged: "Ctrl-S"' \
					-R 'Accel.Search: "Ctrl+F"' \
					-R 'Accel.SearchForward: "Ctrl-G"' \
					--merged-file "$MERGED" \
					"$LOCAL" "$BASE" "$REMOTE"
			else
				"$merge_tool_path" -X $extra \
					-R 'Accel.SaveAsMerged: "Ctrl-S"' \
					-R 'Accel.Search: "Ctrl+F"' \
					-R 'Accel.SearchForward: "Ctrl-G"' \
					--merged-file "$MERGED" \
					"$LOCAL" "$REMOTE"
			fi
			check_unchanged
		else
			"$merge_tool_path" \
				-R 'Accel.Search: "Ctrl+F"' \
				-R 'Accel.SearchForward: "Ctrl-G"' \
				"$LOCAL" "$REMOTE"
		fi
		;;
	opendiff)
		if merge_mode; then
			touch "$BACKUP"
			if $base_present; then
				"$merge_tool_path" "$LOCAL" "$REMOTE" \
					-ancestor "$BASE" \
					-merge "$MERGED" | cat
			else
				"$merge_tool_path" "$LOCAL" "$REMOTE" \
					-merge "$MERGED" | cat
			fi
			check_unchanged
		else
			"$merge_tool_path" "$LOCAL" "$REMOTE" | cat
		fi
		;;
	ecmerge)
		if merge_mode; then
			touch "$BACKUP"
			if $base_present; then
				"$merge_tool_path" "$BASE" "$LOCAL" "$REMOTE" \
					--default --mode=merge3 --to="$MERGED"
			else
				"$merge_tool_path" "$LOCAL" "$REMOTE" \
					--default --mode=merge2 --to="$MERGED"
			fi
			check_unchanged
		else
			"$merge_tool_path" --default --mode=diff2 \
				"$LOCAL" "$REMOTE"
		fi
		;;
	emerge)
		if merge_mode; then
			if $base_present; then
				"$merge_tool_path" \
					-f emerge-files-with-ancestor-command \
					"$LOCAL" "$REMOTE" "$BASE" \
					"$(basename "$MERGED")"
			else
				"$merge_tool_path" \
					-f emerge-files-command \
					"$LOCAL" "$REMOTE" \
					"$(basename "$MERGED")"
			fi
			status=$?
		else
			"$merge_tool_path" -f emerge-files-command \
				"$LOCAL" "$REMOTE"
		fi
		;;
	tortoisemerge)
		if $base_present; then
			touch "$BACKUP"
			"$merge_tool_path" \
				-base:"$BASE" -mine:"$LOCAL" \
				-theirs:"$REMOTE" -merged:"$MERGED"
			check_unchanged
		else
			echo "TortoiseMerge cannot be used without a base" 1>&2
			status=1
		fi
		;;
	araxis)
		if merge_mode; then
			touch "$BACKUP"
			if $base_present; then
				"$merge_tool_path" -wait -merge -3 -a1 \
					"$BASE" "$LOCAL" "$REMOTE" "$MERGED" \
					>/dev/null 2>&1
			else
				"$merge_tool_path" -wait -2 \
					"$LOCAL" "$REMOTE" "$MERGED" \
					>/dev/null 2>&1
			fi
			check_unchanged
		else
			"$merge_tool_path" -wait -2 "$LOCAL" "$REMOTE" \
				>/dev/null 2>&1
		fi
		;;
	*)
		merge_tool_cmd="$(get_merge_tool_cmd "$1")"
		if test -z "$merge_tool_cmd"; then
			if merge_mode; then
				status=1
			fi
			break
		fi
		if merge_mode; then
			trust_exit_code="$(git config --bool \
				mergetool."$1".trustExitCode || echo false)"
			if test "$trust_exit_code" = "false"; then
				touch "$BACKUP"
				( eval $merge_tool_cmd )
				check_unchanged
			else
				( eval $merge_tool_cmd )
				status=$?
			fi
		else
			( eval $merge_tool_cmd )
		fi
		;;
	esac
	return $status
}

guess_merge_tool () {
	if merge_mode; then
		tools="tortoisemerge"
	else
		tools="kompare"
	fi
	if test -n "$DISPLAY"; then
		if test -n "$GNOME_DESKTOP_SESSION_ID" ; then
			tools="meld opendiff kdiff3 tkdiff xxdiff $tools"
		else
			tools="opendiff kdiff3 tkdiff xxdiff meld $tools"
		fi
		tools="$tools gvimdiff diffuse ecmerge p4merge araxis"
	fi
	case "${VISUAL:-$EDITOR}" in
	*vim*)
		tools="$tools vimdiff emerge"
		;;
	*)
		tools="$tools emerge vimdiff"
		;;
	esac
	echo >&2 "merge tool candidates: $tools"

	# Loop over each candidate and stop when a valid merge tool is found.
	for i in $tools
	do
		merge_tool_path="$(translate_merge_tool_path "$i")"
		if type "$merge_tool_path" > /dev/null 2>&1; then
			echo "$i"
			return 0
		fi
	done

	echo >&2 "No known merge resolution program available."
	return 1
}

get_configured_merge_tool () {
	# Diff mode first tries diff.tool and falls back to merge.tool.
	# Merge mode only checks merge.tool
	if diff_mode; then
		merge_tool=$(git config diff.tool || git config merge.tool)
	else
		merge_tool=$(git config merge.tool)
	fi
	if test -n "$merge_tool" && ! valid_tool "$merge_tool"; then
		echo >&2 "git config option $TOOL_MODE.tool set to unknown tool: $merge_tool"
		echo >&2 "Resetting to default..."
		return 1
	fi
	echo "$merge_tool"
}

get_merge_tool_path () {
	# A merge tool has been set, so verify that it's valid.
	if test -n "$1"; then
		merge_tool="$1"
	else
		merge_tool="$(get_merge_tool)"
	fi
	if ! valid_tool "$merge_tool"; then
		echo >&2 "Unknown merge tool $merge_tool"
		exit 1
	fi
	if diff_mode; then
		merge_tool_path=$(git config difftool."$merge_tool".path ||
		                  git config mergetool."$merge_tool".path)
	else
		merge_tool_path=$(git config mergetool."$merge_tool".path)
	fi
	if test -z "$merge_tool_path"; then
		merge_tool_path="$(translate_merge_tool_path "$merge_tool")"
	fi
	if test -z "$(get_merge_tool_cmd "$merge_tool")" &&
	! type "$merge_tool_path" > /dev/null 2>&1; then
		echo >&2 "The $TOOL_MODE tool $merge_tool is not available as"\
		         "'$merge_tool_path'"
		exit 1
	fi
	echo "$merge_tool_path"
}

get_merge_tool () {
	# Check if a merge tool has been configured
	merge_tool=$(get_configured_merge_tool)
	# Try to guess an appropriate merge tool if no tool has been set.
	if test -z "$merge_tool"; then
		merge_tool="$(guess_merge_tool)" || exit
	fi
	echo "$merge_tool"
}