Andrew's git / gitweb.git / git-mergetool.sh
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git-mergetool.shon commit use a LRU eviction policy for the delta base cache (5e08ecb)
   1#!/bin/sh
   2#
   3# This program resolves merge conflicts in git
   4#
   5# Copyright (c) 2006 Theodore Y. Ts'o
   6#
   7# This file is licensed under the GPL v2, or a later version
   8# at the discretion of Junio C Hammano.
   9#
  10
  11USAGE='[--tool=tool] [file to merge] ...'
  12SUBDIRECTORY_OK=Yes
  13. git-sh-setup
  14require_work_tree
  15
  16# Returns true if the mode reflects a symlink
  17function is_symlink () {
  18    test "$1" = 120000
  19}
  20
  21function local_present () {
  22    test -n "$local_mode"
  23}
  24
  25function remote_present () {
  26    test -n "$remote_mode"
  27}
  28
  29function base_present () {
  30    test -n "$base_mode"
  31}
  32
  33cleanup_temp_files () {
  34    if test "$1" = --save-backup ; then
  35        mv -- "$BACKUP" "$path.orig"
  36        rm -f -- "$LOCAL" "$REMOTE" "$BASE"
  37    else
  38        rm -f -- "$LOCAL" "$REMOTE" "$BASE" "$BACKUP"
  39    fi
  40}
  41
  42function describe_file () {
  43    mode="$1"
  44    branch="$2"
  45    file="$3"
  46
  47    echo -n "    "
  48    if test -z "$mode"; then
  49        echo -n "'$path' was deleted"
  50    elif is_symlink "$mode" ; then
  51        echo -n "'$path' is a symlink containing '"
  52        cat "$file"
  53        echo -n "'"
  54    else
  55        if base_present; then
  56            echo -n "'$path' was created"
  57        else
  58            echo -n "'$path' was modified"
  59        fi
  60    fi
  61    echo " in the $branch branch"
  62}
  63
  64
  65resolve_symlink_merge () {
  66    while /bin/true; do
  67        echo -n "Use (r)emote or (l)ocal, or (a)bort? "
  68        read ans
  69        case "$ans" in
  70            [lL]*)
  71                git-checkout-index -f --stage=2 -- "$path"
  72                git-add -- "$path"
  73                cleanup_temp_files --save-backup
  74                return
  75                ;;
  76           [rR]*)
  77                git-checkout-index -f --stage=3 -- "$path"
  78                git-add -- "$path"
  79                cleanup_temp_files --save-backup
  80                return
  81                ;;
  82            [qQ]*)
  83                exit 1
  84                ;;
  85            esac
  86        done
  87}
  88
  89resolve_deleted_merge () {
  90    while /bin/true; do
  91        echo -n "Use (m)odified or (d)eleted file, or (a)bort? "
  92        read ans
  93        case "$ans" in
  94            [mM]*)
  95                git-add -- "$path"
  96                cleanup_temp_files --save-backup
  97                return
  98                ;;
  99           [dD]*)
 100                git-rm -- "$path"
 101                cleanup_temp_files
 102                return
 103                ;;
 104            [qQ]*)
 105                exit 1
 106                ;;
 107            esac
 108        done
 109}
 110
 111merge_file () {
 112    path="$1"
 113
 114    if test ! -f "$path" ; then
 115        echo "$path: file not found"
 116        exit 1
 117    fi
 118
 119    f=`git-ls-files -u -- "$path"`
 120    if test -z "$f" ; then
 121        echo "$path: file does not need merging"
 122        exit 1
 123    fi
 124
 125    BACKUP="$path.BACKUP.$$"
 126    LOCAL="$path.LOCAL.$$"
 127    REMOTE="$path.REMOTE.$$"
 128    BASE="$path.BASE.$$"
 129
 130    mv -- "$path" "$BACKUP"
 131    cp -- "$BACKUP" "$path"
 132
 133    base_mode=`git ls-files -u -- "$path" | awk '{if ($3==1) print $1;}'`
 134    local_mode=`git ls-files -u -- "$path" | awk '{if ($3==2) print $1;}'`
 135    remote_mode=`git ls-files -u -- "$path" | awk '{if ($3==3) print $1;}'`
 136
 137    base_present   && git cat-file blob ":1:$path" > "$BASE" 2>/dev/null
 138    local_present  && git cat-file blob ":2:$path" > "$LOCAL" 2>/dev/null
 139    remote_present && git cat-file blob ":3:$path" > "$REMOTE" 2>/dev/null
 140
 141    if test -z "$local_mode" -o -z "$remote_mode"; then
 142        echo "Deleted merge conflict for $path:"
 143        describe_file "$local_mode" "local" "$LOCAL"
 144        describe_file "$remote_mode" "remote" "$REMOTE"
 145        resolve_deleted_merge
 146        return
 147    fi
 148
 149    if is_symlink "$local_mode" || is_symlink "$remote_mode"; then
 150        echo "Symlink merge conflict for $path:"
 151        describe_file "$local_mode" "local" "$LOCAL"
 152        describe_file "$remote_mode" "remote" "$REMOTE"
 153        resolve_symlink_merge
 154        return
 155    fi
 156
 157    echo "Normal merge conflict for $path:"
 158    describe_file "$local_mode" "local" "$LOCAL"
 159    describe_file "$remote_mode" "remote" "$REMOTE"
 160    echo -n "Hit return to start merge resolution tool ($merge_tool): "
 161    read ans
 162
 163    case "$merge_tool" in
 164        kdiff3)
 165            if base_present ; then
 166                (kdiff3 --auto --L1 "$path (Base)" -L2 "$path (Local)" --L3 "$path (Remote)" \
 167                    -o "$path" -- "$BASE" "$LOCAL" "$REMOTE" > /dev/null 2>&1)
 168            else
 169                (kdiff3 --auto -L1 "$path (Local)" --L2 "$path (Remote)" \
 170                    -o "$path" -- "$LOCAL" "$REMOTE" > /dev/null 2>&1)
 171            fi
 172            status=$?
 173            if test "$status" -eq 0; then
 174                rm "$BACKUP"
 175            fi
 176            ;;
 177        tkdiff)
 178            if base_present ; then
 179                tkdiff -a "$BASE" -o "$path" -- "$LOCAL" "$REMOTE"
 180            else
 181                tkdiff -o "$path" -- "$LOCAL" "$REMOTE"
 182            fi
 183            status=$?
 184            if test "$status" -eq 0; then
 185                mv -- "$BACKUP" "$path.orig"
 186            fi
 187            ;;
 188        meld|vimdiff)
 189            touch "$BACKUP"
 190            $merge_tool -- "$LOCAL" "$path" "$REMOTE"
 191            if test "$path" -nt "$BACKUP" ; then
 192                status=0;
 193            else
 194                while true; do
 195                    echo "$path seems unchanged."
 196                    echo -n "Was the merge successful? [y/n] "
 197                    read answer < /dev/tty
 198                    case "$answer" in
 199                        y*|Y*) status=0; break ;;
 200                        n*|N*) status=1; break ;;
 201                    esac
 202                done
 203            fi
 204            if test "$status" -eq 0; then
 205                mv -- "$BACKUP" "$path.orig"
 206            fi
 207            ;;
 208        xxdiff)
 209            touch "$BACKUP"
 210            if base_present ; then
 211                xxdiff -X --show-merged-pane \
 212                    -R 'Accel.SaveAsMerged: "Ctrl-S"' \
 213                    -R 'Accel.Search: "Ctrl+F"' \
 214                    -R 'Accel.SearchForward: "Ctrl-G"' \
 215                    --merged-file "$path" -- "$LOCAL" "$BASE" "$REMOTE"
 216            else
 217                xxdiff -X --show-merged-pane \
 218                    -R 'Accel.SaveAsMerged: "Ctrl-S"' \
 219                    -R 'Accel.Search: "Ctrl+F"' \
 220                    -R 'Accel.SearchForward: "Ctrl-G"' \
 221                    --merged-file "$path" -- "$LOCAL" "$REMOTE"
 222            fi
 223            if test "$path" -nt "$BACKUP" ; then
 224                status=0;
 225            else
 226                while true; do
 227                    echo "$path seems unchanged."
 228                    echo -n "Was the merge successful? [y/n] "
 229                    read answer < /dev/tty
 230                    case "$answer" in
 231                        y*|Y*) status=0; break ;;
 232                        n*|N*) status=1; break ;;
 233                    esac
 234                done
 235            fi
 236            if test "$status" -eq 0; then
 237                mv -- "$BACKUP" "$path.orig"
 238            fi
 239            ;;
 240        emerge)
 241            if base_present ; then
 242                emacs -f emerge-files-with-ancestor-command "$LOCAL" "$REMOTE" "$BASE" "$path"
 243            else
 244                emacs -f emerge-files-command "$LOCAL" "$REMOTE" "$path"
 245            fi
 246            status=$?
 247            if test "$status" -eq 0; then
 248                mv -- "$BACKUP" "$path.orig"
 249            fi
 250            ;;
 251    esac
 252    if test "$status" -ne 0; then
 253        echo "merge of $path failed" 1>&2
 254        mv -- "$BACKUP" "$path"
 255        exit 1
 256    fi
 257    git add -- "$path"
 258    cleanup_temp_files
 259}
 260
 261while case $# in 0) break ;; esac
 262do
 263    case "$1" in
 264        -t|--tool*)
 265            case "$#,$1" in
 266                *,*=*)
 267                    merge_tool=`expr "z$1" : 'z-[^=]*=\(.*\)'`
 268                    ;;
 269                1,*)
 270                    usage ;;
 271                *)
 272                    merge_tool="$2"
 273                    shift ;;
 274            esac
 275            ;;
 276        --)
 277            break
 278            ;;
 279        -*)
 280            usage
 281            ;;
 282        *)
 283            break
 284            ;;
 285    esac
 286    shift
 287done
 288
 289if test -z "$merge_tool"; then
 290    merge_tool=`git-config merge.tool`
 291    case "$merge_tool" in
 292        kdiff3 | tkdiff | xxdiff | meld | emerge | vimdiff)
 293            ;; # happy
 294        *)
 295            echo >&2 "git config option merge.tool set to unknown tool: $merge_tool"
 296            echo >&2 "Resetting to default..."
 297            unset merge_tool
 298            ;;
 299    esac
 300fi
 301
 302if test -z "$merge_tool" ; then
 303    if type kdiff3 >/dev/null 2>&1 && test -n "$DISPLAY"; then
 304        merge_tool="kdiff3";
 305    elif type tkdiff >/dev/null 2>&1 && test -n "$DISPLAY"; then
 306        merge_tool=tkdiff
 307    elif type xxdiff >/dev/null 2>&1 && test -n "$DISPLAY"; then
 308        merge_tool=xxdiff
 309    elif type meld >/dev/null 2>&1 && test -n "$DISPLAY"; then
 310        merge_tool=meld
 311    elif type emacs >/dev/null 2>&1; then
 312        merge_tool=emerge
 313    elif type vimdiff >/dev/null 2>&1; then
 314        merge_tool=vimdiff
 315    else
 316        echo "No available merge resolution programs available."
 317        exit 1
 318    fi
 319fi
 320
 321case "$merge_tool" in
 322    kdiff3|tkdiff|meld|xxdiff|vimdiff)
 323        if ! type "$merge_tool" > /dev/null 2>&1; then
 324            echo "The merge tool $merge_tool is not available"
 325            exit 1
 326        fi
 327        ;;
 328    emerge)
 329        if ! type "emacs" > /dev/null 2>&1; then
 330            echo "Emacs is not available"
 331            exit 1
 332        fi
 333        ;;
 334    *)
 335        echo "Unknown merge tool: $merge_tool"
 336        exit 1
 337        ;;
 338esac
 339
 340if test $# -eq 0 ; then
 341        files=`git ls-files -u | sed -e 's/^[^  ]*      //' | sort -u`
 342        if test -z "$files" ; then
 343                echo "No files need merging"
 344                exit 0
 345        fi
 346        echo Merging the files: $files
 347        git ls-files -u | sed -e 's/^[^ ]*      //' | sort -u | while read i
 348        do
 349                echo ""
 350                merge_file "$i" < /dev/tty > /dev/tty
 351        done
 352else
 353        while test $# -gt 0; do
 354                echo ""
 355                merge_file "$1"
 356                shift
 357        done
 358fi
 359exit 0