git-mergetool--lib.sh


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

#!/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 () {
	echo "$1"
}

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

valid_tool_config () {
	if test -n "$(get_merge_tool_cmd "$1")"
	then
		return 0
	else
		return 1
	fi
}

valid_tool () {
	setup_tool "$1" || valid_tool_config "$1"
}

setup_tool () {
	case "$1" in
	vim*|gvim*)
		tool=vim
		;;
	*)
		tool="$1"
		;;
	esac
	mergetools="$(git --exec-path)/mergetools"

	# Load the default definitions
	. "$mergetools/defaults"
	if ! test -f "$mergetools/$tool"
	then
		return 1
	fi

	# Load the redefined functions
	. "$mergetools/$tool"

	if merge_mode && ! can_merge
	then
		echo "error: '$tool' can not be used to resolve merges" >&2
		exit 1
	elif diff_mode && ! can_diff
	then
		echo "error: '$tool' can only be used to resolve merges" >&2
		exit 1
	fi
	return 0
}

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

# Entry point for running tools
run_merge_tool () {
	# If GIT_PREFIX is empty then we cannot use it in tools
	# that expect to be able to chdir() to its value.
	GIT_PREFIX=${GIT_PREFIX:-.}
	export GIT_PREFIX

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

	# Bring tool-specific functions into scope
	setup_tool "$1"

	if merge_mode
	then
		merge_cmd "$1"
	else
		diff_cmd "$1"
	fi
	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 bc3"
	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.
	merge_tool="$1"
	if ! valid_tool "$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"
}