mailmap: simplify map_user() interface
[gitweb.git] / git-mergetool.sh
index 87fa88af5526c8e27b823a65ca15bee4085f8ef2..c50e18a8998c1f4ca1449e1733f76cb769f501b9 100755 (executable)
 # at the discretion of Junio C Hamano.
 #
 
-USAGE='[--tool=tool] [-y|--no-prompt|--prompt] [file to merge] ...'
+USAGE='[--tool=tool] [--tool-help] [-y|--no-prompt|--prompt] [file to merge] ...'
 SUBDIRECTORY_OK=Yes
 OPTIONS_SPEC=
+TOOL_MODE=merge
 . git-sh-setup
+. git-mergetool--lib
 require_work_tree
 
 # Returns true if the mode reflects a symlink
 is_symlink () {
-    test "$1" = 120000
+       test "$1" = 120000
+}
+
+is_submodule () {
+       test "$1" = 160000
 }
 
 local_present () {
-    test -n "$local_mode"
+       test -n "$local_mode"
 }
 
 remote_present () {
-    test -n "$remote_mode"
+       test -n "$remote_mode"
 }
 
 base_present () {
-    test -n "$base_mode"
+       test -n "$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
+       if test "$1" = --save-backup
+       then
+               rm -rf -- "$MERGED.orig"
+               test -e "$BACKUP" && mv -- "$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"
+       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")'"
+       elif is_submodule "$mode"
+       then
+               echo "submodule commit $file"
+       elif base_present
+       then
+               echo "modified file"
        else
-           echo "created"
+               echo "created file"
        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 -- "$MERGED"
-               cleanup_temp_files --save-backup
-               return 0
-               ;;
-           [rR]*)
-               git checkout-index -f --stage=3 -- "$MERGED"
-               git add -- "$MERGED"
-               cleanup_temp_files --save-backup
-               return 0
-               ;;
-           [aA]*)
-               return 1
-               ;;
-           esac
+       while true
+       do
+               printf "Use (l)ocal or (r)emote, or (a)bort? "
+               read ans || return 1
+               case "$ans" in
+               [lL]*)
+                       git checkout-index -f --stage=2 -- "$MERGED"
+                       git add -- "$MERGED"
+                       cleanup_temp_files --save-backup
+                       return 0
+                       ;;
+               [rR]*)
+                       git checkout-index -f --stage=3 -- "$MERGED"
+                       git add -- "$MERGED"
+                       cleanup_temp_files --save-backup
+                       return 0
+                       ;;
+               [aA]*)
+                       return 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 0
-               ;;
-           [dD]*)
-               git rm -- "$MERGED" > /dev/null
-               cleanup_temp_files
-               return 0
-               ;;
-           [aA]*)
-               return 1
-               ;;
-           esac
+       while true
+       do
+               if base_present
+               then
+                       printf "Use (m)odified or (d)eleted file, or (a)bort? "
+               else
+                       printf "Use (c)reated or (d)eleted file, or (a)bort? "
+               fi
+               read ans || return 1
+               case "$ans" in
+               [mMcC]*)
+                       git add -- "$MERGED"
+                       cleanup_temp_files --save-backup
+                       return 0
+                       ;;
+               [dD]*)
+                       git rm -- "$MERGED" > /dev/null
+                       cleanup_temp_files
+                       return 0
+                       ;;
+               [aA]*)
+                       return 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
+resolve_submodule_merge () {
+       while true
+       do
+               printf "Use (l)ocal or (r)emote, or (a)bort? "
+               read ans || return 1
+               case "$ans" in
+               [lL]*)
+                       if ! local_present
+                       then
+                               if test -n "$(git ls-tree HEAD -- "$MERGED")"
+                               then
+                                       # Local isn't present, but it's a subdirectory
+                                       git ls-tree --full-name -r HEAD -- "$MERGED" |
+                                       git update-index --index-info || exit $?
+                               else
+                                       test -e "$MERGED" && mv -- "$MERGED" "$BACKUP"
+                                       git update-index --force-remove "$MERGED"
+                                       cleanup_temp_files --save-backup
+                               fi
+                       elif is_submodule "$local_mode"
+                       then
+                               stage_submodule "$MERGED" "$local_sha1"
+                       else
+                               git checkout-index -f --stage=2 -- "$MERGED"
+                               git add -- "$MERGED"
+                       fi
+                       return 0
+                       ;;
+               [rR]*)
+                       if ! remote_present
+                       then
+                               if test -n "$(git ls-tree MERGE_HEAD -- "$MERGED")"
+                               then
+                                       # Remote isn't present, but it's a subdirectory
+                                       git ls-tree --full-name -r MERGE_HEAD -- "$MERGED" |
+                                       git update-index --index-info || exit $?
+                               else
+                                       test -e "$MERGED" && mv -- "$MERGED" "$BACKUP"
+                                       git update-index --force-remove "$MERGED"
+                               fi
+                       elif is_submodule "$remote_mode"
+                       then
+                               ! is_submodule "$local_mode" &&
+                               test -e "$MERGED" &&
+                               mv -- "$MERGED" "$BACKUP"
+                               stage_submodule "$MERGED" "$remote_sha1"
+                       else
+                               test -e "$MERGED" && mv -- "$MERGED" "$BACKUP"
+                               git checkout-index -f --stage=3 -- "$MERGED"
+                               git add -- "$MERGED"
+                       fi
+                       cleanup_temp_files --save-backup
+                       return 0
+                       ;;
+               [aA]*)
+                       return 1
+                       ;;
+               esac
        done
-    fi
+}
+
+stage_submodule () {
+       path="$1"
+       submodule_sha1="$2"
+       mkdir -p "$path" ||
+       die "fatal: unable to create directory for module at $path"
+       # Find $path relative to work tree
+       work_tree_root=$(cd_to_toplevel && pwd)
+       work_rel_path=$(cd "$path" &&
+               GIT_WORK_TREE="${work_tree_root}" git rev-parse --show-prefix
+       )
+       test -n "$work_rel_path" ||
+       die "fatal: unable to get path of module $path relative to work tree"
+       git update-index --add --replace --cacheinfo 160000 "$submodule_sha1" "${work_rel_path%/}" || die
 }
 
 checkout_staged_file () {
-    tmpfile=$(expr "$(git checkout-index --temp --stage="$1" "$2")" : '\([^    ]*\)    ')
+       tmpfile=$(expr \
+               "$(git checkout-index --temp --stage="$1" "$2" 2>/dev/null)" \
+               : '\([^ ]*\)    ')
 
-    if test $? -eq 0 -a -n "$tmpfile" ; then
-       mv -- "$(git rev-parse --show-cdup)$tmpfile" "$3"
-    fi
+       if test $? -eq 0 -a -n "$tmpfile"
+       then
+               mv -- "$(git rev-parse --show-cdup)$tmpfile" "$3"
+       else
+               >"$3"
+       fi
 }
 
 merge_file () {
-    MERGED="$1"
+       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
+               return 1
+       fi
 
-    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"
+       ext="$$$(expr "$MERGED" : '.*\(\.[^/]*\)$')"
+       BACKUP="./$MERGED.BACKUP.$ext"
+       LOCAL="./$MERGED.LOCAL.$ext"
+       REMOTE="./$MERGED.REMOTE.$ext"
+       BASE="./$MERGED.BASE.$ext"
+
+       base_mode=$(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 $1;}')
+
+       if is_submodule "$local_mode" || is_submodule "$remote_mode"
+       then
+               echo "Submodule merge conflict for '$MERGED':"
+               local_sha1=$(git ls-files -u -- "$MERGED" | awk '{if ($3==2) print $2;}')
+               remote_sha1=$(git ls-files -u -- "$MERGED" | awk '{if ($3==3) print $2;}')
+               describe_file "$local_mode" "local" "$local_sha1"
+               describe_file "$remote_mode" "remote" "$remote_sha1"
+               resolve_submodule_merge
+               return
        fi
-       return 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"
 
-    mv -- "$MERGED" "$BACKUP"
-    cp -- "$BACKUP" "$MERGED"
+       checkout_staged_file 1 "$MERGED" "$BASE"
+       checkout_staged_file 2 "$MERGED" "$LOCAL"
+       checkout_staged_file 3 "$MERGED" "$REMOTE"
 
-    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 $1;}'`
+       if test -z "$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
 
-    base_present   && checkout_staged_file 1 "$MERGED" "$BASE"
-    local_present  && checkout_staged_file 2 "$MERGED" "$LOCAL"
-    remote_present && checkout_staged_file 3 "$MERGED" "$REMOTE"
+       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
 
-    if test -z "$local_mode" -o -z "$remote_mode"; then
-       echo "Deleted merge conflict for '$MERGED':"
+       echo "Normal merge conflict for '$MERGED':"
        describe_file "$local_mode" "local" "$LOCAL"
        describe_file "$remote_mode" "remote" "$REMOTE"
-       resolve_deleted_merge
-       return
-    fi
+       if "$prompt" = true
+       then
+               printf "Hit return to start merge resolution tool (%s): " "$merge_tool"
+               read ans || return 1
+       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"
-    if "$prompt" = true; then
-       printf "Hit return to start merge resolution tool (%s): " "$merge_tool"
-       read ans
-    fi
-
-    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)
-           touch "$BACKUP"
-           "$merge_tool_path" "$LOCAL" "$MERGED" "$REMOTE"
-           check_unchanged
-           ;;
-       vimdiff)
-           touch "$BACKUP"
-           "$merge_tool_path" -c "wincmd l" "$LOCAL" "$MERGED" "$REMOTE"
-           check_unchanged
-           ;;
-       gvimdiff)
-           touch "$BACKUP"
-           "$merge_tool_path" -c "wincmd l" -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 $merge_tool_cmd )
-                   status=$?
+       if base_present
+       then
+               present=true
+       else
+               present=false
+       fi
+
+       if ! run_merge_tool "$merge_tool" "$present"
+       then
+               echo "merge of $MERGED failed" 1>&2
+               mv -- "$BACKUP" "$MERGED"
+
+               if test "$merge_keep_temporaries" = "false"
+               then
+                       cleanup_temp_files
                fi
-           fi
-           ;;
-    esac
-    if test "$status" -ne 0; then
-       echo "merge of $MERGED failed" 1>&2
-       mv -- "$BACKUP" "$MERGED"
-
-       if test "$merge_keep_temporaries" = "false"; then
-           cleanup_temp_files
+
+               return 1
        fi
 
-       return 1
-    fi
+       if test "$merge_keep_backup" = "true"
+       then
+               mv -- "$BACKUP" "$MERGED.orig"
+       else
+               rm -- "$BACKUP"
+       fi
 
-    if test "$merge_keep_backup" = "true"; then
-       mv -- "$BACKUP" "$MERGED.orig"
-    else
-       rm -- "$BACKUP"
-    fi
+       git add -- "$MERGED"
+       cleanup_temp_files
+       return 0
+}
 
-    git add -- "$MERGED"
-    cleanup_temp_files
-    return 0
+show_tool_help () {
+       TOOL_MODE=merge
+       list_merge_tool_candidates
+       unavailable= available= LF='
+'
+       for i in $tools
+       do
+               merge_tool_path=$(translate_merge_tool_path "$i")
+               if type "$merge_tool_path" >/dev/null 2>&1
+               then
+                       available="$available$i$LF"
+               else
+                       unavailable="$unavailable$i$LF"
+               fi
+       done
+       if test -n "$available"
+       then
+               echo "'git mergetool --tool=<tool>' may be set to one of the following:"
+               echo "$available" | sort | sed -e 's/^/ /'
+       else
+               echo "No suitable tool for 'git mergetool --tool=<tool>' found."
+       fi
+       if test -n "$unavailable"
+       then
+               echo
+               echo 'The following tools are valid, but not currently available:'
+               echo "$unavailable" | sort | sed -e 's/^/       /'
+       fi
+       if test -n "$unavailable$available"
+       then
+               echo
+               echo "Some of the tools listed above only work in a windowed"
+               echo "environment. If run in a terminal-only session, they will fail."
+       fi
+       exit 0
 }
 
 prompt=$(git config --bool mergetool.prompt || echo true)
 
 while test $# != 0
 do
-    case "$1" in
+       case "$1" in
+       --tool-help)
+               show_tool_help
+               ;;
        -t|--tool*)
-           case "$#,$1" in
+               case "$#,$1" in
                *,*=*)
-                   merge_tool=`expr "z$1" : 'z-[^=]*=\(.*\)'`
-                   ;;
+                       merge_tool=$(expr "z$1" : 'z-[^=]*=\(.*\)')
+                       ;;
                1,*)
-                   usage ;;
+                       usage ;;
                *)
-                   merge_tool="$2"
-                   shift ;;
-           esac
-           ;;
+                       merge_tool="$2"
+                       shift ;;
+               esac
+               ;;
        -y|--no-prompt)
-           prompt=false
-           ;;
+               prompt=false
+               ;;
        --prompt)
-           prompt=true
-           ;;
+               prompt=true
+               ;;
        --)
-           shift
-           break
-           ;;
+               shift
+               break
+               ;;
        -*)
-           usage
-           ;;
+               usage
+               ;;
        *)
-           break
-           ;;
-    esac
-    shift
+               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 "$1"; then
-                               return 1
-                       fi
+prompt_after_failed_merge () {
+       while true
+       do
+               printf "Continue merging other unresolved paths (y/n) ? "
+               read ans || return 1
+               case "$ans" in
+               [yY]*)
+                       return 0
+                       ;;
+               [nN]*)
+                       return 1
                        ;;
-       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=$1
-                               ;;
                esac
-       fi
-}
-
-prompt_after_failed_merge() {
-    while true; do
-       printf "Continue merging other unresolved paths (y/n) ? "
-       read ans
-       case "$ans" in
-
-           [yY]*)
-               return 0
-               ;;
-
-           [nN]*)
-               return 1
-               ;;
-       esac
-    done
+       done
 }
 
-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: $merge_tool"
-           echo >&2 "Resetting to default..."
-           unset merge_tool
-    fi
+if test -z "$merge_tool"
+then
+       merge_tool=$(get_merge_tool "$merge_tool") || exit
 fi
+merge_keep_backup="$(git config --bool mergetool.keepBackup || echo true)"
+merge_keep_temporaries="$(git config --bool mergetool.keepTemporaries || echo false)"
 
-if test -z "$merge_tool" ; then
-    if test -n "$DISPLAY"; then
-        if test -n "$GNOME_DESKTOP_SESSION_ID" ; then
-            merge_tool_candidates="meld kdiff3 tkdiff xxdiff gvimdiff"
-        else
-            merge_tool_candidates="kdiff3 tkdiff xxdiff meld gvimdiff"
-        fi
-    fi
-    if echo "${VISUAL:-$EDITOR}" | grep 'emacs' > /dev/null 2>&1; then
-        merge_tool_candidates="$merge_tool_candidates emerge opendiff vimdiff"
-    elif echo "${VISUAL:-$EDITOR}" | grep 'vim' > /dev/null 2>&1; then
-        merge_tool_candidates="$merge_tool_candidates vimdiff opendiff emerge"
-    else
-        merge_tool_candidates="$merge_tool_candidates opendiff emerge vimdiff"
-    fi
-    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="$(git config --bool merge.keepBackup || echo true)"
-    merge_keep_temporaries="$(git config --bool mergetool.keepTemporaries || echo false)"
+last_status=0
+rollup_status=0
+files=
 
-    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 $# -eq 0
+then
+       cd_to_toplevel
 
-    if ! test -z "$merge_tool_cmd"; then
-        merge_tool_trust_exit_code="$(git config --bool mergetool.$merge_tool.trustExitCode || echo false)"
-    fi
+       if test -e "$GIT_DIR/MERGE_RR"
+       then
+               files=$(git rerere remaining)
+       else
+               files=$(git ls-files -u | sed -e 's/^[^ ]*      //' | sort -u)
+       fi
+else
+       files=$(git ls-files -u -- "$@" | sed -e 's/^[^ ]*      //' | sort -u)
 fi
 
-last_status=0
-rollup_status=0
-
-if test $# -eq 0 ; then
-    files=`git ls-files -u | sed -e 's/^[^     ]*      //' | sort -u`
-    if test -z "$files" ; then
+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
-       if test $last_status -ne 0; then
-           prompt_after_failed_merge < /dev/tty || exit 1
-       fi
-       printf "\n"
-       merge_file "$i" < /dev/tty > /dev/tty
-       last_status=$?
-       if test $last_status -ne 0; then
-           rollup_status=1
-       fi
-    done
-else
-    while test $# -gt 0; do
-       if test $last_status -ne 0; then
-           prompt_after_failed_merge || exit 1
+fi
+
+printf "Merging:\n"
+printf "$files\n"
+
+IFS='
+'
+for i in $files
+do
+       if test $last_status -ne 0
+       then
+               prompt_after_failed_merge || exit 1
        fi
        printf "\n"
-       merge_file "$1"
+       merge_file "$i"
        last_status=$?
-       if test $last_status -ne 0; then
-           rollup_status=1
+       if test $last_status -ne 0
+       then
+               rollup_status=1
        fi
-       shift
-    done
-fi
+done
 
 exit $rollup_status