git-mergetool.sh - git - Git at Google

 #!/bin/sh
 #
 # This program resolves merge conflicts in git
 #
 # Copyright (c) 2006 Theodore Y. Ts'o
 #
 # This file is licensed under the GPL v2, or a later version
 # at the discretion of Junio C Hamano.
 #

 USAGE='[--tool=tool] [file to merge] ...'
 SUBDIRECTORY_OK=Yes
 OPTIONS_SPEC=
 . git-sh-setup
 require_work_tree
 prefix=$(git rev-parse --show-prefix)

 # Returns true if the mode reflects a symlink
 is_symlink () {
     test "$1" = 120000
 }

 local_present () {
     test -n "$local_mode"
 }

 remote_present () {
     test -n "$remote_mode"
 }

 base_present () {
     test -n "$base_mode"
 }

 cleanup_temp_files () {
     if test "$1" = --save-backup ; then
 	mv -- "$BACKUP" "$MERGED.orig"
 	rm -f -- "$LOCAL" "$REMOTE" "$BASE"
     else
 	rm -f -- "$LOCAL" "$REMOTE" "$BASE" "$BACKUP"
     fi
 }

 describe_file () {
     mode="$1"
     branch="$2"
     file="$3"

     printf "  {%s}: " "$branch"
     if test -z "$mode"; then
 	echo "deleted"
     elif is_symlink "$mode" ; then
 	echo "a symbolic link -> '$(cat "$file")'"
     else
 	if base_present; then
 	    echo "modified"
 	else
 	    echo "created"
 	fi
     fi
 }


 resolve_symlink_merge () {
     while true; do
 	printf "Use (l)ocal or (r)emote, or (a)bort? "
 	read ans
 	case "$ans" in
 	    [lL]*)
 		git checkout-index -f --stage=2 -- "$MERGED"
 		git add -- "$MERGED"
 		cleanup_temp_files --save-backup
 		return
 		;;
 	    [rR]*)
 		git checkout-index -f --stage=3 -- "$MERGED"
 		git add -- "$MERGED"
 		cleanup_temp_files --save-backup
 		return
 		;;
 	    [aA]*)
 		exit 1
 		;;
 	    esac
 	done
 }

 resolve_deleted_merge () {
     while true; do
 	if base_present; then
 	    printf "Use (m)odified or (d)eleted file, or (a)bort? "
 	else
 	    printf "Use (c)reated or (d)eleted file, or (a)bort? "
 	fi
 	read ans
 	case "$ans" in
 	    [mMcC]*)
 		git add -- "$MERGED"
 		cleanup_temp_files --save-backup
 		return
 		;;
 	    [dD]*)
 		git rm -- "$MERGED" > /dev/null
 		cleanup_temp_files
 		return
 		;;
 	    [aA]*)
 		exit 1
 		;;
 	    esac
 	done
 }

 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
 }

 merge_file () {
     MERGED="$1"

     f=`git ls-files -u -- "$MERGED"`
     if test -z "$f" ; then
 	if test ! -f "$MERGED" ; then
 	    echo "$MERGED: file not found"
 	else
 	    echo "$MERGED: file does not need merging"
 	fi
 	exit 1
     fi

     ext="$$$(expr "$MERGED" : '.*\(\.[^/]*\)$')"
     BACKUP="./$MERGED.BACKUP.$ext"
     LOCAL="./$MERGED.LOCAL.$ext"
     REMOTE="./$MERGED.REMOTE.$ext"
     BASE="./$MERGED.BASE.$ext"

     mv -- "$MERGED" "$BACKUP"
     cp -- "$BACKUP" "$MERGED"

     base_mode=`git ls-files -u -- "$MERGED" | awk '{if ($3==1) print $1;}'`
     local_mode=`git ls-files -u -- "$MERGED" | awk '{if ($3==2) print $1;}'`
     remote_mode=`git ls-files -u -- "$MERGED" | awk '{if ($3==3) print $1;}'`

     base_present   && git cat-file blob ":1:$prefix$MERGED" >"$BASE" 2>/dev/null
     local_present  && git cat-file blob ":2:$prefix$MERGED" >"$LOCAL" 2>/dev/null
     remote_present && git cat-file blob ":3:$prefix$MERGED" >"$REMOTE" 2>/dev/null

     if test -z "$local_mode" -o -z "$remote_mode"; then
 	echo "Deleted merge conflict for '$MERGED':"
 	describe_file "$local_mode" "local" "$LOCAL"
 	describe_file "$remote_mode" "remote" "$REMOTE"
 	resolve_deleted_merge
 	return
     fi

     if is_symlink "$local_mode" || is_symlink "$remote_mode"; then
 	echo "Symbolic link merge conflict for '$MERGED':"
 	describe_file "$local_mode" "local" "$LOCAL"
 	describe_file "$remote_mode" "remote" "$REMOTE"
 	resolve_symlink_merge
 	return
     fi

     echo "Normal merge conflict for '$MERGED':"
     describe_file "$local_mode" "local" "$LOCAL"
     describe_file "$remote_mode" "remote" "$REMOTE"
     printf "Hit return to start merge resolution tool (%s): " "$merge_tool"
     read ans

     case "$merge_tool" in
 	kdiff3)
 	    if base_present ; then
 		("$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" "$REMOTE" > /dev/null 2>&1)
 	    fi
 	    status=$?
 	    ;;
 	tkdiff)
 	    if base_present ; then
 		"$merge_tool_path" -a "$BASE" -o "$MERGED" "$LOCAL" "$REMOTE"
 	    else
 		"$merge_tool_path" -o "$MERGED" "$LOCAL" "$REMOTE"
 	    fi
 	    status=$?
 	    ;;
 	meld|vimdiff)
 	    touch "$BACKUP"
 	    "$merge_tool_path" "$LOCAL" "$MERGED" "$REMOTE"
 	    check_unchanged
 	    ;;
 	gvimdiff)
 	    touch "$BACKUP"
 	    "$merge_tool_path" -f "$LOCAL" "$MERGED" "$REMOTE"
 	    check_unchanged
 	    ;;
 	xxdiff)
 	    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
 		"$merge_tool_path" -X --show-merged-pane \
 		    -R 'Accel.SaveAsMerged: "Ctrl-S"' \
 		    -R 'Accel.Search: "Ctrl+F"' \
 		    -R 'Accel.SearchForward: "Ctrl-G"' \
 		    --merged-file "$MERGED" "$LOCAL" "$REMOTE"
 	    fi
 	    check_unchanged
 	    ;;
 	opendiff)
 	    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
 	    ;;
 	ecmerge)
 	    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
 	    ;;
 	emerge)
 	    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 "$MERGED")"
 	    fi
 	    status=$?
 	    ;;
 	*)
 	    if test -n "$merge_tool_cmd"; then
 		if test "$merge_tool_trust_exit_code" = "false"; then
 		    touch "$BACKUP"
 		    ( eval $merge_tool_cmd )
 		    check_unchanged
 		else
 		    ( eval $merge_tool_cmd )
 		    status=$?
 		fi
 	    fi
 	    ;;
     esac
     if test "$status" -ne 0; then
 	echo "merge of $MERGED failed" 1>&2
 	mv -- "$BACKUP" "$MERGED"
 	exit 1
     fi

     if test "$merge_keep_backup" = "true"; then
 	mv -- "$BACKUP" "$MERGED.orig"
     else
 	rm -- "$BACKUP"
     fi

     git add -- "$MERGED"
     cleanup_temp_files
 }

 while test $# != 0
 do
     case "$1" in
 	-t|--tool*)
 	    case "$#,$1" in
 		*,*=*)
 		    merge_tool=`expr "z$1" : 'z-[^=]*=\(.*\)'`
 		    ;;
 		1,*)
 		    usage ;;
 		*)
 		    merge_tool="$2"
 		    shift ;;
 	    esac
 	    ;;
 	--)
 	    shift
 	    break
 	    ;;
 	-*)
 	    usage
 	    ;;
 	*)
 	    break
 	    ;;
     esac
     shift
 done

 valid_custom_tool()
 {
     merge_tool_cmd="$(git config mergetool.$1.cmd)"
     test -n "$merge_tool_cmd"
 }

 valid_tool() {
 	case "$1" in
 		kdiff3 | tkdiff | xxdiff | meld | opendiff | emerge | vimdiff | gvimdiff | ecmerge)
 			;; # happy
 		*)
 			if ! valid_custom_tool "$1"; then
 				return 1
 			fi
 			;;
 	esac
 }

 init_merge_tool_path() {
 	merge_tool_path=`git config mergetool.$1.path`
 	if test -z "$merge_tool_path" ; then
 		case "$1" in
 			emerge)
 				merge_tool_path=emacs
 				;;
 			*)
 				merge_tool_path=$1
 				;;
 		esac
 	fi
 }


 if test -z "$merge_tool"; then
     merge_tool=`git config merge.tool`
     if test -n "$merge_tool" && ! valid_tool "$merge_tool"; then
 	    echo >&2 "git config option merge.tool set to unknown tool: $merge_tool"
 	    echo >&2 "Resetting to default..."
 	    unset merge_tool
     fi
 fi

 if test -z "$merge_tool" ; then
     if test -n "$DISPLAY"; then
         merge_tool_candidates="kdiff3 tkdiff xxdiff meld gvimdiff"
         if test -n "$GNOME_DESKTOP_SESSION_ID" ; then
             merge_tool_candidates="meld $merge_tool_candidates"
         fi
         if test "$KDE_FULL_SESSION" = "true"; then
             merge_tool_candidates="kdiff3 $merge_tool_candidates"
         fi
     fi
     if echo "${VISUAL:-$EDITOR}" | grep 'emacs' > /dev/null 2>&1; then
         merge_tool_candidates="$merge_tool_candidates emerge"
     fi
     if echo "${VISUAL:-$EDITOR}" | grep 'vim' > /dev/null 2>&1; then
         merge_tool_candidates="$merge_tool_candidates vimdiff"
     fi
     merge_tool_candidates="$merge_tool_candidates opendiff emerge vimdiff"
     echo "merge tool candidates: $merge_tool_candidates"
     for i in $merge_tool_candidates; do
         init_merge_tool_path $i
         if type "$merge_tool_path" > /dev/null 2>&1; then
             merge_tool=$i
             break
         fi
     done
     if test -z "$merge_tool" ; then
 	echo "No known merge resolution program available."
 	exit 1
     fi
 else
     if ! valid_tool "$merge_tool"; then
         echo >&2 "Unknown merge_tool $merge_tool"
         exit 1
     fi

     init_merge_tool_path "$merge_tool"

     merge_keep_backup="$(git config --bool merge.keepBackup || echo true)"

     if test -z "$merge_tool_cmd" && ! type "$merge_tool_path" > /dev/null 2>&1; then
         echo "The merge tool $merge_tool is not available as '$merge_tool_path'"
         exit 1
     fi

     if ! test -z "$merge_tool_cmd"; then
         merge_tool_trust_exit_code="$(git config --bool mergetool.$merge_tool.trustExitCode || echo false)"
     fi
 fi


 if test $# -eq 0 ; then
 	files=`git ls-files -u | sed -e 's/^[^	]*	//' | sort -u`
 	if test -z "$files" ; then
 		echo "No files need merging"
 		exit 0
 	fi
 	echo Merging the files: "$files"
 	git ls-files -u |
 	sed -e 's/^[^	]*	//' |
 	sort -u |
 	while IFS= read i
 	do
 		printf "\n"
 		merge_file "$i" < /dev/tty > /dev/tty
 	done
 else
 	while test $# -gt 0; do
 		printf "\n"
 		merge_file "$1"
 		shift
 	done
 fi
 exit 0
	#!/bin/sh
	#
	# This program resolves merge conflicts in git
	#
	# Copyright (c) 2006 Theodore Y. Ts'o
	#
	# This file is licensed under the GPL v2, or a later version
	# at the discretion of Junio C Hamano.
	#

	USAGE='[--tool=tool] [file to merge] ...'
	SUBDIRECTORY_OK=Yes
	OPTIONS_SPEC=
	. git-sh-setup
	require_work_tree
	prefix=$(git rev-parse --show-prefix)

	# Returns true if the mode reflects a symlink
	is_symlink () {
	test "$1" = 120000
	}

	local_present () {
	test -n "$local_mode"
	}

	remote_present () {
	test -n "$remote_mode"
	}

	base_present () {
	test -n "$base_mode"
	}

	cleanup_temp_files () {
	if test "$1" = --save-backup ; then
	mv -- "$BACKUP" "$MERGED.orig"
	rm -f -- "$LOCAL" "$REMOTE" "$BASE"
	else
	rm -f -- "$LOCAL" "$REMOTE" "$BASE" "$BACKUP"
	fi
	}

	describe_file () {
	mode="$1"
	branch="$2"
	file="$3"

	printf " {%s}: " "$branch"
	if test -z "$mode"; then
	echo "deleted"
	elif is_symlink "$mode" ; then
	echo "a symbolic link -> '$(cat "$file")'"
	else
	if base_present; then
	echo "modified"
	else
	echo "created"
	fi
	fi
	}


	resolve_symlink_merge () {
	while true; do
	printf "Use (l)ocal or (r)emote, or (a)bort? "
	read ans
	case "$ans" in
	[lL]*)
	git checkout-index -f --stage=2 -- "$MERGED"
	git add -- "$MERGED"
	cleanup_temp_files --save-backup
	return
	;;
	[rR]*)
	git checkout-index -f --stage=3 -- "$MERGED"
	git add -- "$MERGED"
	cleanup_temp_files --save-backup
	return
	;;
	[aA]*)
	exit 1
	;;
	esac
	done
	}

	resolve_deleted_merge () {
	while true; do
	if base_present; then
	printf "Use (m)odified or (d)eleted file, or (a)bort? "
	else
	printf "Use (c)reated or (d)eleted file, or (a)bort? "
	fi
	read ans
	case "$ans" in
	[mMcC]*)
	git add -- "$MERGED"
	cleanup_temp_files --save-backup
	return
	;;
	[dD]*)
	git rm -- "$MERGED" > /dev/null
	cleanup_temp_files
	return
	;;
	[aA]*)
	exit 1
	;;
	esac
	done
	}

	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
	}

	merge_file () {
	MERGED="$1"

	f=`git ls-files -u -- "$MERGED"`
	if test -z "$f" ; then
	if test ! -f "$MERGED" ; then
	echo "$MERGED: file not found"
	else
	echo "$MERGED: file does not need merging"
	fi
	exit 1
	fi

	ext="$$$(expr "$MERGED" : '.\(\.[^/]\)$')"
	BACKUP="./$MERGED.BACKUP.$ext"
	LOCAL="./$MERGED.LOCAL.$ext"
	REMOTE="./$MERGED.REMOTE.$ext"
	BASE="./$MERGED.BASE.$ext"

	mv -- "$MERGED" "$BACKUP"
	cp -- "$BACKUP" "$MERGED"

	base_mode=`git ls-files -u -- "$MERGED" \| awk '{if ($3==1) print $1;}'`
	local_mode=`git ls-files -u -- "$MERGED" \| awk '{if ($3==2) print $1;}'`
	remote_mode=`git ls-files -u -- "$MERGED" \| awk '{if ($3==3) print $1;}'`

	base_present && git cat-file blob ":1:$prefix$MERGED" >"$BASE" 2>/dev/null
	local_present && git cat-file blob ":2:$prefix$MERGED" >"$LOCAL" 2>/dev/null
	remote_present && git cat-file blob ":3:$prefix$MERGED" >"$REMOTE" 2>/dev/null

	if test -z "$local_mode" -o -z "$remote_mode"; then
	echo "Deleted merge conflict for '$MERGED':"
	describe_file "$local_mode" "local" "$LOCAL"
	describe_file "$remote_mode" "remote" "$REMOTE"
	resolve_deleted_merge
	return
	fi

	if is_symlink "$local_mode" \|\| is_symlink "$remote_mode"; then
	echo "Symbolic link merge conflict for '$MERGED':"
	describe_file "$local_mode" "local" "$LOCAL"
	describe_file "$remote_mode" "remote" "$REMOTE"
	resolve_symlink_merge
	return
	fi

	echo "Normal merge conflict for '$MERGED':"
	describe_file "$local_mode" "local" "$LOCAL"
	describe_file "$remote_mode" "remote" "$REMOTE"
	printf "Hit return to start merge resolution tool (%s): " "$merge_tool"
	read ans

	case "$merge_tool" in
	kdiff3)
	if base_present ; then
	("$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" "$REMOTE" > /dev/null 2>&1)
	fi
	status=$?
	;;
	tkdiff)
	if base_present ; then
	"$merge_tool_path" -a "$BASE" -o "$MERGED" "$LOCAL" "$REMOTE"
	else
	"$merge_tool_path" -o "$MERGED" "$LOCAL" "$REMOTE"
	fi
	status=$?
	;;
	meld\|vimdiff)
	touch "$BACKUP"
	"$merge_tool_path" "$LOCAL" "$MERGED" "$REMOTE"
	check_unchanged
	;;
	gvimdiff)
	touch "$BACKUP"
	"$merge_tool_path" -f "$LOCAL" "$MERGED" "$REMOTE"
	check_unchanged
	;;
	xxdiff)
	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
	"$merge_tool_path" -X --show-merged-pane \
	-R 'Accel.SaveAsMerged: "Ctrl-S"' \
	-R 'Accel.Search: "Ctrl+F"' \
	-R 'Accel.SearchForward: "Ctrl-G"' \
	--merged-file "$MERGED" "$LOCAL" "$REMOTE"
	fi
	check_unchanged
	;;
	opendiff)
	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
	;;
	ecmerge)
	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
	;;
	emerge)
	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 "$MERGED")"
	fi
	status=$?
	;;
	*)
	if test -n "$merge_tool_cmd"; then
	if test "$merge_tool_trust_exit_code" = "false"; then
	touch "$BACKUP"
	( eval $merge_tool_cmd )
	check_unchanged
	else
	( eval $merge_tool_cmd )
	status=$?
	fi
	fi
	;;
	esac
	if test "$status" -ne 0; then
	echo "merge of $MERGED failed" 1>&2
	mv -- "$BACKUP" "$MERGED"
	exit 1
	fi

	if test "$merge_keep_backup" = "true"; then
	mv -- "$BACKUP" "$MERGED.orig"
	else
	rm -- "$BACKUP"
	fi

	git add -- "$MERGED"
	cleanup_temp_files
	}

	while test $# != 0
	do
	case "$1" in
	-t\|--tool*)
	case "$#,$1" in
	,=*)
	merge_tool=`expr "z$1" : 'z-[^=]=\(.\)'`
	;;
	1,*)
	usage ;;
	*)
	merge_tool="$2"
	shift ;;
	esac
	;;
	--)
	shift
	break
	;;
	-*)
	usage
	;;
	*)
	break
	;;
	esac
	shift
	done

	valid_custom_tool()
	{
	merge_tool_cmd="$(git config mergetool.$1.cmd)"
	test -n "$merge_tool_cmd"
	}

	valid_tool() {
	case "$1" in
	kdiff3 \| tkdiff \| xxdiff \| meld \| opendiff \| emerge \| vimdiff \| gvimdiff \| ecmerge)
	;; # happy
	*)
	if ! valid_custom_tool "$1"; then
	return 1
	fi
	;;
	esac
	}

	init_merge_tool_path() {
	merge_tool_path=`git config mergetool.$1.path`
	if test -z "$merge_tool_path" ; then
	case "$1" in
	emerge)
	merge_tool_path=emacs
	;;
	*)
	merge_tool_path=$1
	;;
	esac
	fi
	}


	if test -z "$merge_tool"; then
	merge_tool=`git config merge.tool`
	if test -n "$merge_tool" && ! valid_tool "$merge_tool"; then
	echo >&2 "git config option merge.tool set to unknown tool: $merge_tool"
	echo >&2 "Resetting to default..."
	unset merge_tool
	fi
	fi

	if test -z "$merge_tool" ; then
	if test -n "$DISPLAY"; then
	merge_tool_candidates="kdiff3 tkdiff xxdiff meld gvimdiff"
	if test -n "$GNOME_DESKTOP_SESSION_ID" ; then
	merge_tool_candidates="meld $merge_tool_candidates"
	fi
	if test "$KDE_FULL_SESSION" = "true"; then
	merge_tool_candidates="kdiff3 $merge_tool_candidates"
	fi
	fi
	if echo "${VISUAL:-$EDITOR}" \| grep 'emacs' > /dev/null 2>&1; then
	merge_tool_candidates="$merge_tool_candidates emerge"
	fi
	if echo "${VISUAL:-$EDITOR}" \| grep 'vim' > /dev/null 2>&1; then
	merge_tool_candidates="$merge_tool_candidates vimdiff"
	fi
	merge_tool_candidates="$merge_tool_candidates opendiff emerge vimdiff"
	echo "merge tool candidates: $merge_tool_candidates"
	for i in $merge_tool_candidates; do
	init_merge_tool_path $i
	if type "$merge_tool_path" > /dev/null 2>&1; then
	merge_tool=$i
	break
	fi
	done
	if test -z "$merge_tool" ; then
	echo "No known merge resolution program available."
	exit 1
	fi
	else
	if ! valid_tool "$merge_tool"; then
	echo >&2 "Unknown merge_tool $merge_tool"
	exit 1
	fi

	init_merge_tool_path "$merge_tool"

	merge_keep_backup="$(git config --bool merge.keepBackup \|\| echo true)"

	if test -z "$merge_tool_cmd" && ! type "$merge_tool_path" > /dev/null 2>&1; then
	echo "The merge tool $merge_tool is not available as '$merge_tool_path'"
	exit 1
	fi

	if ! test -z "$merge_tool_cmd"; then
	merge_tool_trust_exit_code="$(git config --bool mergetool.$merge_tool.trustExitCode \|\| echo false)"
	fi
	fi


	if test $# -eq 0 ; then
	files=`git ls-files -u \| sed -e 's/^[^ ]* //' \| sort -u`
	if test -z "$files" ; then
	echo "No files need merging"
	exit 0
	fi
	echo Merging the files: "$files"
	git ls-files -u \|
	sed -e 's/^[^ ]* //' \|
	sort -u \|
	while IFS= read i
	do
	printf "\n"
	merge_file "$i" < /dev/tty > /dev/tty
	done
	else
	while test $# -gt 0; do
	printf "\n"
	merge_file "$1"
	shift
	done
	fi
	exit 0