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p4merge « mergetools - git.kernel.org/pub/scm/git/git.git - Unnamed repository; edit this file 'description' to name the repository.
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diff_cmd () {
	empty_file=

	# p4merge does not like /dev/null
	if test "/dev/null" = "$LOCAL"
	then
		LOCAL="$(create_empty_file)"
	fi
	if test "/dev/null" = "$REMOTE"
	then
		REMOTE="$(create_empty_file)"
	fi

	"$merge_tool_path" "$LOCAL" "$REMOTE"

	if test -n "$empty_file"
	then
		rm -f "$empty_file"
	fi
}

merge_cmd () {
	touch "$BACKUP"
	$base_present || >"$BASE"
	"$merge_tool_path" "$BASE" "$LOCAL" "$REMOTE" "$MERGED"
	check_unchanged
}

create_empty_file () {
	empty_file="${TMPDIR:-/tmp}/git-difftool-p4merge-empty-file.$$"
	>"$empty_file"

	printf "$empty_file"
}