Andrew's git - gitweb.git/blob

   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 Hamano.
   9#
  10
  11USAGE='[--tool=tool] [file to merge] ...'
  12SUBDIRECTORY_OK=Yes
  13. git-sh-setup
  14require_work_tree
  15prefix=$(git rev-parse --show-prefix)
  16
  17# Returns true if the mode reflects a symlink
  18is_symlink () {
  19    test "$1" = 120000
  20}
  21
  22local_present () {
  23    test -n "$local_mode"
  24}
  25
  26remote_present () {
  27    test -n "$remote_mode"
  28}
  29
  30base_present () {
  31    test -n "$base_mode"
  32}
  33
  34cleanup_temp_files () {
  35    if test "$1" = --save-backup ; then
  36        mv -- "$BACKUP" "$path.orig"
  37        rm -f -- "$LOCAL" "$REMOTE" "$BASE"
  38    else
  39        rm -f -- "$LOCAL" "$REMOTE" "$BASE" "$BACKUP"
  40    fi
  41}
  42
  43describe_file () {
  44    mode="$1"
  45    branch="$2"
  46    file="$3"
  47
  48    printf "  {%s}: " "$branch"
  49    if test -z "$mode"; then
  50        echo "deleted"
  51    elif is_symlink "$mode" ; then
  52        echo "a symbolic link -> '$(cat "$file")'"
  53    else
  54        if base_present; then
  55            echo "modified"
  56        else
  57            echo "created"
  58        fi
  59    fi
  60}
  61
  62
  63resolve_symlink_merge () {
  64    while true; do
  65        printf "Use (l)ocal or (r)emote, or (a)bort? "
  66        read ans
  67        case "$ans" in
  68            [lL]*)
  69                git checkout-index -f --stage=2 -- "$path"
  70                git add -- "$path"
  71                cleanup_temp_files --save-backup
  72                return
  73                ;;
  74            [rR]*)
  75                git checkout-index -f --stage=3 -- "$path"
  76                git add -- "$path"
  77                cleanup_temp_files --save-backup
  78                return
  79                ;;
  80            [aA]*)
  81                exit 1
  82                ;;
  83            esac
  84        done
  85}
  86
  87resolve_deleted_merge () {
  88    while true; do
  89        if base_present; then
  90            printf "Use (m)odified or (d)eleted file, or (a)bort? "
  91        else
  92            printf "Use (c)reated or (d)eleted file, or (a)bort? "
  93        fi
  94        read ans
  95        case "$ans" in
  96            [mMcC]*)
  97                git add -- "$path"
  98                cleanup_temp_files --save-backup
  99                return
 100                ;;
 101            [dD]*)
 102                git rm -- "$path" > /dev/null
 103                cleanup_temp_files
 104                return
 105                ;;
 106            [aA]*)
 107                exit 1
 108                ;;
 109            esac
 110        done
 111}
 112
 113check_unchanged () {
 114    if test "$path" -nt "$BACKUP" ; then
 115        status=0;
 116    else
 117        while true; do
 118            echo "$path seems unchanged."
 119            printf "Was the merge successful? [y/n] "
 120            read answer < /dev/tty
 121            case "$answer" in
 122                y*|Y*) status=0; break ;;
 123                n*|N*) status=1; break ;;
 124            esac
 125        done
 126    fi
 127}
 128
 129save_backup () {
 130    if test "$status" -eq 0; then
 131        mv -- "$BACKUP" "$path.orig"
 132    fi
 133}
 134
 135remove_backup () {
 136    if test "$status" -eq 0; then
 137        rm "$BACKUP"
 138    fi
 139}
 140
 141merge_file () {
 142    path="$1"
 143
 144    f=`git ls-files -u -- "$path"`
 145    if test -z "$f" ; then
 146        if test ! -f "$path" ; then
 147            echo "$path: file not found"
 148        else
 149            echo "$path: file does not need merging"
 150        fi
 151        exit 1
 152    fi
 153
 154    BACKUP="$path.BACKUP.$$"
 155    LOCAL="$path.LOCAL.$$"
 156    REMOTE="$path.REMOTE.$$"
 157    BASE="$path.BASE.$$"
 158
 159    mv -- "$path" "$BACKUP"
 160    cp -- "$BACKUP" "$path"
 161
 162    base_mode=`git ls-files -u -- "$path" | awk '{if ($3==1) print $1;}'`
 163    local_mode=`git ls-files -u -- "$path" | awk '{if ($3==2) print $1;}'`
 164    remote_mode=`git ls-files -u -- "$path" | awk '{if ($3==3) print $1;}'`
 165
 166    base_present   && git cat-file blob ":1:$prefix$path" >"$BASE" 2>/dev/null
 167    local_present  && git cat-file blob ":2:$prefix$path" >"$LOCAL" 2>/dev/null
 168    remote_present && git cat-file blob ":3:$prefix$path" >"$REMOTE" 2>/dev/null
 169
 170    if test -z "$local_mode" -o -z "$remote_mode"; then
 171        echo "Deleted merge conflict for '$path':"
 172        describe_file "$local_mode" "local" "$LOCAL"
 173        describe_file "$remote_mode" "remote" "$REMOTE"
 174        resolve_deleted_merge
 175        return
 176    fi
 177
 178    if is_symlink "$local_mode" || is_symlink "$remote_mode"; then
 179        echo "Symbolic link merge conflict for '$path':"
 180        describe_file "$local_mode" "local" "$LOCAL"
 181        describe_file "$remote_mode" "remote" "$REMOTE"
 182        resolve_symlink_merge
 183        return
 184    fi
 185
 186    echo "Normal merge conflict for '$path':"
 187    describe_file "$local_mode" "local" "$LOCAL"
 188    describe_file "$remote_mode" "remote" "$REMOTE"
 189    printf "Hit return to start merge resolution tool (%s): " "$merge_tool"
 190    read ans
 191
 192    case "$merge_tool" in
 193        kdiff3)
 194            if base_present ; then
 195                ("$merge_tool_path" --auto --L1 "$path (Base)" --L2 "$path (Local)" --L3 "$path (Remote)" \
 196                    -o "$path" -- "$BASE" "$LOCAL" "$REMOTE" > /dev/null 2>&1)
 197            else
 198                ("$merge_tool_path" --auto --L1 "$path (Local)" --L2 "$path (Remote)" \
 199                    -o "$path" -- "$LOCAL" "$REMOTE" > /dev/null 2>&1)
 200            fi
 201            status=$?
 202            remove_backup
 203            ;;
 204        tkdiff)
 205            if base_present ; then
 206                "$merge_tool_path" -a "$BASE" -o "$path" -- "$LOCAL" "$REMOTE"
 207            else
 208                "$merge_tool_path" -o "$path" -- "$LOCAL" "$REMOTE"
 209            fi
 210            status=$?
 211            save_backup
 212            ;;
 213        meld|vimdiff)
 214            touch "$BACKUP"
 215            "$merge_tool_path" -- "$LOCAL" "$path" "$REMOTE"
 216            check_unchanged
 217            save_backup
 218            ;;
 219        gvimdiff)
 220                touch "$BACKUP"
 221                "$merge_tool_path" -f -- "$LOCAL" "$path" "$REMOTE"
 222                check_unchanged
 223                save_backup
 224                ;;
 225        xxdiff)
 226            touch "$BACKUP"
 227            if base_present ; then
 228                "$merge_tool_path" -X --show-merged-pane \
 229                    -R 'Accel.SaveAsMerged: "Ctrl-S"' \
 230                    -R 'Accel.Search: "Ctrl+F"' \
 231                    -R 'Accel.SearchForward: "Ctrl-G"' \
 232                    --merged-file "$path" -- "$LOCAL" "$BASE" "$REMOTE"
 233            else
 234                "$merge_tool_path" -X --show-merged-pane \
 235                    -R 'Accel.SaveAsMerged: "Ctrl-S"' \
 236                    -R 'Accel.Search: "Ctrl+F"' \
 237                    -R 'Accel.SearchForward: "Ctrl-G"' \
 238                    --merged-file "$path" -- "$LOCAL" "$REMOTE"
 239            fi
 240            check_unchanged
 241            save_backup
 242            ;;
 243        opendiff)
 244            touch "$BACKUP"
 245            if base_present; then
 246                "$merge_tool_path" "$LOCAL" "$REMOTE" -ancestor "$BASE" -merge "$path" | cat
 247            else
 248                "$merge_tool_path" "$LOCAL" "$REMOTE" -merge "$path" | cat
 249            fi
 250            check_unchanged
 251            save_backup
 252            ;;
 253        ecmerge)
 254            touch "$BACKUP"
 255            if base_present; then
 256                "$merge_tool_path" "$BASE" "$LOCAL" "$REMOTE" --mode=merge3 --to="$path"
 257            else
 258                "$merge_tool_path" "$LOCAL" "$REMOTE" --mode=merge2 --to="$path"
 259            fi
 260            check_unchanged
 261            save_backup
 262            ;;
 263        emerge)
 264            if base_present ; then
 265                "$merge_tool_path" -f emerge-files-with-ancestor-command "$LOCAL" "$REMOTE" "$BASE" "$(basename "$path")"
 266            else
 267                "$merge_tool_path" -f emerge-files-command "$LOCAL" "$REMOTE" "$(basename "$path")"
 268            fi
 269            status=$?
 270            save_backup
 271            ;;
 272    esac
 273    if test "$status" -ne 0; then
 274        echo "merge of $path failed" 1>&2
 275        mv -- "$BACKUP" "$path"
 276        exit 1
 277    fi
 278    git add -- "$path"
 279    cleanup_temp_files
 280}
 281
 282while test $# != 0
 283do
 284    case "$1" in
 285        -t|--tool*)
 286            case "$#,$1" in
 287                *,*=*)
 288                    merge_tool=`expr "z$1" : 'z-[^=]*=\(.*\)'`
 289                    ;;
 290                1,*)
 291                    usage ;;
 292                *)
 293                    merge_tool="$2"
 294                    shift ;;
 295            esac
 296            ;;
 297        --)
 298            break
 299            ;;
 300        -*)
 301            usage
 302            ;;
 303        *)
 304            break
 305            ;;
 306    esac
 307    shift
 308done
 309
 310valid_tool() {
 311        case "$1" in
 312                kdiff3 | tkdiff | xxdiff | meld | opendiff | emerge | vimdiff | gvimdiff | ecmerge)
 313                        ;; # happy
 314                *)
 315                        return 1
 316                        ;;
 317        esac
 318}
 319
 320init_merge_tool_path() {
 321        merge_tool_path=`git config mergetool.$1.path`
 322        if test -z "$merge_tool_path" ; then
 323                case "$1" in
 324                        emerge)
 325                                merge_tool_path=emacs
 326                                ;;
 327                        *)
 328                                merge_tool_path=$1
 329                                ;;
 330                esac
 331        fi
 332}
 333
 334
 335if test -z "$merge_tool"; then
 336    merge_tool=`git config merge.tool`
 337    if test -n "$merge_tool" && ! valid_tool "$merge_tool"; then
 338            echo >&2 "git config option merge.tool set to unknown tool: $merge_tool"
 339            echo >&2 "Resetting to default..."
 340            unset merge_tool
 341    fi
 342fi
 343
 344if test -z "$merge_tool" ; then
 345    if test -n "$DISPLAY"; then
 346        merge_tool_candidates="kdiff3 tkdiff xxdiff meld gvimdiff"
 347        if test -n "$GNOME_DESKTOP_SESSION_ID" ; then
 348            merge_tool_candidates="meld $merge_tool_candidates"
 349        fi
 350        if test "$KDE_FULL_SESSION" = "true"; then
 351            merge_tool_candidates="kdiff3 $merge_tool_candidates"
 352        fi
 353    fi
 354    if echo "${VISUAL:-$EDITOR}" | grep 'emacs' > /dev/null 2>&1; then
 355        merge_tool_candidates="$merge_tool_candidates emerge"
 356    fi
 357    if echo "${VISUAL:-$EDITOR}" | grep 'vim' > /dev/null 2>&1; then
 358        merge_tool_candidates="$merge_tool_candidates vimdiff"
 359    fi
 360    merge_tool_candidates="$merge_tool_candidates opendiff emerge vimdiff"
 361    echo "merge tool candidates: $merge_tool_candidates"
 362    for i in $merge_tool_candidates; do
 363        init_merge_tool_path $i
 364        if type "$merge_tool_path" > /dev/null 2>&1; then
 365            merge_tool=$i
 366            break
 367        fi
 368    done
 369    if test -z "$merge_tool" ; then
 370        echo "No known merge resolution program available."
 371        exit 1
 372    fi
 373else
 374    if ! valid_tool "$merge_tool"; then
 375        echo >&2 "Unknown merge_tool $merge_tool"
 376        exit 1
 377    fi
 378
 379    init_merge_tool_path "$merge_tool"
 380
 381    if ! type "$merge_tool_path" > /dev/null 2>&1; then
 382        echo "The merge tool $merge_tool is not available as '$merge_tool_path'"
 383        exit 1
 384    fi
 385fi
 386
 387
 388if test $# -eq 0 ; then
 389        files=`git ls-files -u | sed -e 's/^[^  ]*      //' | sort -u`
 390        if test -z "$files" ; then
 391                echo "No files need merging"
 392                exit 0
 393        fi
 394        echo Merging the files: $files
 395        git ls-files -u | sed -e 's/^[^ ]*      //' | sort -u | while read i
 396        do
 397                printf "\n"
 398                merge_file "$i" < /dev/tty > /dev/tty
 399        done
 400else
 401        while test $# -gt 0; do
 402                printf "\n"
 403                merge_file "$1"
 404                shift
 405        done
 406fi
 407exit 0