Andrew's git - gitweb.git/blob

6e611e94a467ba3b3e1f56624807e231e865bce7
   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] [-y|--no-prompt|--prompt] [file to merge] ...'
  12SUBDIRECTORY_OK=Yes
  13OPTIONS_SPEC=
  14. git-sh-setup
  15require_work_tree
  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" "$MERGED.orig"
  37        rm -f -- "$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 "$ans" in
  68            [lL]*)
  69                git checkout-index -f --stage=2 -- "$MERGED"
  70                git add -- "$MERGED"
  71                cleanup_temp_files --save-backup
  72                return 0
  73                ;;
  74            [rR]*)
  75                git checkout-index -f --stage=3 -- "$MERGED"
  76                git add -- "$MERGED"
  77                cleanup_temp_files --save-backup
  78                return 0
  79                ;;
  80            [aA]*)
  81                return 1
  82                ;;
  83            esac
  84        done
  85}
  86
  87resolve_deleted_merge () {
  88    while true; do
  89        if base_present; then
  90            printf "Use (m)odified or (d)eleted file, or (a)bort? "
  91        else
  92            printf "Use (c)reated or (d)eleted file, or (a)bort? "
  93        fi
  94        read ans
  95        case "$ans" in
  96            [mMcC]*)
  97                git add -- "$MERGED"
  98                cleanup_temp_files --save-backup
  99                return 0
 100                ;;
 101            [dD]*)
 102                git rm -- "$MERGED" > /dev/null
 103                cleanup_temp_files
 104                return 0
 105                ;;
 106            [aA]*)
 107                return 1
 108                ;;
 109            esac
 110        done
 111}
 112
 113check_unchanged () {
 114    if test "$MERGED" -nt "$BACKUP" ; then
 115        status=0;
 116    else
 117        while true; do
 118            echo "$MERGED seems unchanged."
 119            printf "Was the merge successful? [y/n] "
 120            read answer < /dev/tty
 121            case "$answer" in
 122                y*|Y*) status=0; break ;;
 123                n*|N*) status=1; break ;;
 124            esac
 125        done
 126    fi
 127}
 128
 129checkout_staged_file () {
 130    tmpfile=$(expr "$(git checkout-index --temp --stage="$1" "$2")" : '\([^     ]*\)    ')
 131
 132    if test $? -eq 0 -a -n "$tmpfile" ; then
 133        mv -- "$(git rev-parse --show-cdup)$tmpfile" "$3"
 134    fi
 135}
 136
 137merge_file () {
 138    MERGED="$1"
 139
 140    f=`git ls-files -u -- "$MERGED"`
 141    if test -z "$f" ; then
 142        if test ! -f "$MERGED" ; then
 143            echo "$MERGED: file not found"
 144        else
 145            echo "$MERGED: file does not need merging"
 146        fi
 147        return 1
 148    fi
 149
 150    ext="$$$(expr "$MERGED" : '.*\(\.[^/]*\)$')"
 151    BACKUP="./$MERGED.BACKUP.$ext"
 152    LOCAL="./$MERGED.LOCAL.$ext"
 153    REMOTE="./$MERGED.REMOTE.$ext"
 154    BASE="./$MERGED.BASE.$ext"
 155
 156    mv -- "$MERGED" "$BACKUP"
 157    cp -- "$BACKUP" "$MERGED"
 158
 159    base_mode=`git ls-files -u -- "$MERGED" | awk '{if ($3==1) print $1;}'`
 160    local_mode=`git ls-files -u -- "$MERGED" | awk '{if ($3==2) print $1;}'`
 161    remote_mode=`git ls-files -u -- "$MERGED" | awk '{if ($3==3) print $1;}'`
 162
 163    base_present   && checkout_staged_file 1 "$MERGED" "$BASE"
 164    local_present  && checkout_staged_file 2 "$MERGED" "$LOCAL"
 165    remote_present && checkout_staged_file 3 "$MERGED" "$REMOTE"
 166
 167    if test -z "$local_mode" -o -z "$remote_mode"; then
 168        echo "Deleted merge conflict for '$MERGED':"
 169        describe_file "$local_mode" "local" "$LOCAL"
 170        describe_file "$remote_mode" "remote" "$REMOTE"
 171        resolve_deleted_merge
 172        return
 173    fi
 174
 175    if is_symlink "$local_mode" || is_symlink "$remote_mode"; then
 176        echo "Symbolic link merge conflict for '$MERGED':"
 177        describe_file "$local_mode" "local" "$LOCAL"
 178        describe_file "$remote_mode" "remote" "$REMOTE"
 179        resolve_symlink_merge
 180        return
 181    fi
 182
 183    echo "Normal merge conflict for '$MERGED':"
 184    describe_file "$local_mode" "local" "$LOCAL"
 185    describe_file "$remote_mode" "remote" "$REMOTE"
 186    if "$prompt" = true; then
 187        printf "Hit return to start merge resolution tool (%s): " "$merge_tool"
 188        read ans
 189    fi
 190
 191    case "$merge_tool" in
 192        kdiff3)
 193            if base_present ; then
 194                ("$merge_tool_path" --auto --L1 "$MERGED (Base)" --L2 "$MERGED (Local)" --L3 "$MERGED (Remote)" \
 195                    -o "$MERGED" "$BASE" "$LOCAL" "$REMOTE" > /dev/null 2>&1)
 196            else
 197                ("$merge_tool_path" --auto --L1 "$MERGED (Local)" --L2 "$MERGED (Remote)" \
 198                    -o "$MERGED" "$LOCAL" "$REMOTE" > /dev/null 2>&1)
 199            fi
 200            status=$?
 201            ;;
 202        tkdiff)
 203            if base_present ; then
 204                "$merge_tool_path" -a "$BASE" -o "$MERGED" "$LOCAL" "$REMOTE"
 205            else
 206                "$merge_tool_path" -o "$MERGED" "$LOCAL" "$REMOTE"
 207            fi
 208            status=$?
 209            ;;
 210        meld)
 211            touch "$BACKUP"
 212            "$merge_tool_path" "$LOCAL" "$MERGED" "$REMOTE"
 213            check_unchanged
 214            ;;
 215        vimdiff)
 216            touch "$BACKUP"
 217            "$merge_tool_path" -d -c "wincmd l" "$LOCAL" "$MERGED" "$REMOTE"
 218            check_unchanged
 219            ;;
 220        gvimdiff)
 221            touch "$BACKUP"
 222            "$merge_tool_path" -d -c "wincmd l" -f "$LOCAL" "$MERGED" "$REMOTE"
 223            check_unchanged
 224            ;;
 225        xxdiff)
 226            touch "$BACKUP"
 227            if base_present ; then
 228                "$merge_tool_path" -X --show-merged-pane \
 229                    -R 'Accel.SaveAsMerged: "Ctrl-S"' \
 230                    -R 'Accel.Search: "Ctrl+F"' \
 231                    -R 'Accel.SearchForward: "Ctrl-G"' \
 232                    --merged-file "$MERGED" "$LOCAL" "$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 "$MERGED" "$LOCAL" "$REMOTE"
 239            fi
 240            check_unchanged
 241            ;;
 242        opendiff)
 243            touch "$BACKUP"
 244            if base_present; then
 245                "$merge_tool_path" "$LOCAL" "$REMOTE" -ancestor "$BASE" -merge "$MERGED" | cat
 246            else
 247                "$merge_tool_path" "$LOCAL" "$REMOTE" -merge "$MERGED" | cat
 248            fi
 249            check_unchanged
 250            ;;
 251        ecmerge)
 252            touch "$BACKUP"
 253            if base_present; then
 254                "$merge_tool_path" "$BASE" "$LOCAL" "$REMOTE" --default --mode=merge3 --to="$MERGED"
 255            else
 256                "$merge_tool_path" "$LOCAL" "$REMOTE" --default --mode=merge2 --to="$MERGED"
 257            fi
 258            check_unchanged
 259            ;;
 260        emerge)
 261            if base_present ; then
 262                "$merge_tool_path" -f emerge-files-with-ancestor-command "$LOCAL" "$REMOTE" "$BASE" "$(basename "$MERGED")"
 263            else
 264                "$merge_tool_path" -f emerge-files-command "$LOCAL" "$REMOTE" "$(basename "$MERGED")"
 265            fi
 266            status=$?
 267            ;;
 268        *)
 269            if test -n "$merge_tool_cmd"; then
 270                if test "$merge_tool_trust_exit_code" = "false"; then
 271                    touch "$BACKUP"
 272                    ( eval $merge_tool_cmd )
 273                    check_unchanged
 274                else
 275                    ( eval $merge_tool_cmd )
 276                    status=$?
 277                fi
 278            fi
 279            ;;
 280    esac
 281    if test "$status" -ne 0; then
 282        echo "merge of $MERGED failed" 1>&2
 283        mv -- "$BACKUP" "$MERGED"
 284
 285        if test "$merge_keep_temporaries" = "false"; then
 286            cleanup_temp_files
 287        fi
 288
 289        return 1
 290    fi
 291
 292    if test "$merge_keep_backup" = "true"; then
 293        mv -- "$BACKUP" "$MERGED.orig"
 294    else
 295        rm -- "$BACKUP"
 296    fi
 297
 298    git add -- "$MERGED"
 299    cleanup_temp_files
 300    return 0
 301}
 302
 303prompt=$(git config --bool mergetool.prompt || echo true)
 304
 305while test $# != 0
 306do
 307    case "$1" in
 308        -t|--tool*)
 309            case "$#,$1" in
 310                *,*=*)
 311                    merge_tool=`expr "z$1" : 'z-[^=]*=\(.*\)'`
 312                    ;;
 313                1,*)
 314                    usage ;;
 315                *)
 316                    merge_tool="$2"
 317                    shift ;;
 318            esac
 319            ;;
 320        -y|--no-prompt)
 321            prompt=false
 322            ;;
 323        --prompt)
 324            prompt=true
 325            ;;
 326        --)
 327            shift
 328            break
 329            ;;
 330        -*)
 331            usage
 332            ;;
 333        *)
 334            break
 335            ;;
 336    esac
 337    shift
 338done
 339
 340valid_custom_tool()
 341{
 342    merge_tool_cmd="$(git config mergetool.$1.cmd)"
 343    test -n "$merge_tool_cmd"
 344}
 345
 346valid_tool() {
 347        case "$1" in
 348                kdiff3 | tkdiff | xxdiff | meld | opendiff | emerge | vimdiff | gvimdiff | ecmerge)
 349                        ;; # happy
 350                *)
 351                        if ! valid_custom_tool "$1"; then
 352                                return 1
 353                        fi
 354                        ;;
 355        esac
 356}
 357
 358init_merge_tool_path() {
 359        merge_tool_path=`git config mergetool.$1.path`
 360        if test -z "$merge_tool_path" ; then
 361                case "$1" in
 362                        vimdiff)
 363                                merge_tool_path=vim
 364                                ;;
 365                        gvimdiff)
 366                                merge_tool_path=gvim
 367                                ;;
 368                        emerge)
 369                                merge_tool_path=emacs
 370                                ;;
 371                        *)
 372                                merge_tool_path=$1
 373                                ;;
 374                esac
 375        fi
 376}
 377
 378prompt_after_failed_merge() {
 379    while true; do
 380        printf "Continue merging other unresolved paths (y/n) ? "
 381        read ans
 382        case "$ans" in
 383
 384            [yY]*)
 385                return 0
 386                ;;
 387
 388            [nN]*)
 389                return 1
 390                ;;
 391        esac
 392    done
 393}
 394
 395if test -z "$merge_tool"; then
 396    merge_tool=`git config merge.tool`
 397    if test -n "$merge_tool" && ! valid_tool "$merge_tool"; then
 398            echo >&2 "git config option merge.tool set to unknown tool: $merge_tool"
 399            echo >&2 "Resetting to default..."
 400            unset merge_tool
 401    fi
 402fi
 403
 404if test -z "$merge_tool" ; then
 405    if test -n "$DISPLAY"; then
 406        if test -n "$GNOME_DESKTOP_SESSION_ID" ; then
 407            merge_tool_candidates="meld kdiff3 tkdiff xxdiff gvimdiff"
 408        else
 409            merge_tool_candidates="kdiff3 tkdiff xxdiff meld gvimdiff"
 410        fi
 411    fi
 412    if echo "${VISUAL:-$EDITOR}" | grep 'emacs' > /dev/null 2>&1; then
 413        merge_tool_candidates="$merge_tool_candidates emerge opendiff vimdiff"
 414    elif echo "${VISUAL:-$EDITOR}" | grep 'vim' > /dev/null 2>&1; then
 415        merge_tool_candidates="$merge_tool_candidates vimdiff opendiff emerge"
 416    else
 417        merge_tool_candidates="$merge_tool_candidates opendiff emerge vimdiff"
 418    fi
 419    echo "merge tool candidates: $merge_tool_candidates"
 420    for i in $merge_tool_candidates; do
 421        init_merge_tool_path $i
 422        if type "$merge_tool_path" > /dev/null 2>&1; then
 423            merge_tool=$i
 424            break
 425        fi
 426    done
 427    if test -z "$merge_tool" ; then
 428        echo "No known merge resolution program available."
 429        exit 1
 430    fi
 431else
 432    if ! valid_tool "$merge_tool"; then
 433        echo >&2 "Unknown merge_tool $merge_tool"
 434        exit 1
 435    fi
 436
 437    init_merge_tool_path "$merge_tool"
 438
 439    merge_keep_backup="$(git config --bool merge.keepBackup || echo true)"
 440    merge_keep_temporaries="$(git config --bool mergetool.keepTemporaries || echo false)"
 441
 442    if test -z "$merge_tool_cmd" && ! type "$merge_tool_path" > /dev/null 2>&1; then
 443        echo "The merge tool $merge_tool is not available as '$merge_tool_path'"
 444        exit 1
 445    fi
 446
 447    if ! test -z "$merge_tool_cmd"; then
 448        merge_tool_trust_exit_code="$(git config --bool mergetool.$merge_tool.trustExitCode || echo false)"
 449    fi
 450fi
 451
 452last_status=0
 453rollup_status=0
 454
 455if test $# -eq 0 ; then
 456    files=`git ls-files -u | sed -e 's/^[^      ]*      //' | sort -u`
 457    if test -z "$files" ; then
 458        echo "No files need merging"
 459        exit 0
 460    fi
 461    echo Merging the files: "$files"
 462    git ls-files -u |
 463    sed -e 's/^[^       ]*      //' |
 464    sort -u |
 465    while IFS= read i
 466    do
 467        if test $last_status -ne 0; then
 468            prompt_after_failed_merge < /dev/tty || exit 1
 469        fi
 470        printf "\n"
 471        merge_file "$i" < /dev/tty > /dev/tty
 472        last_status=$?
 473        if test $last_status -ne 0; then
 474            rollup_status=1
 475        fi
 476    done
 477else
 478    while test $# -gt 0; do
 479        if test $last_status -ne 0; then
 480            prompt_after_failed_merge || exit 1
 481        fi
 482        printf "\n"
 483        merge_file "$1"
 484        last_status=$?
 485        if test $last_status -ne 0; then
 486            rollup_status=1
 487        fi
 488        shift
 489    done
 490fi
 491
 492exit $rollup_status