git-mergetool.sh

   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
  11 USAGE='[--tool=tool] [-y|--no-prompt|--prompt] [file to merge] ...'
  12 SUBDIRECTORY_OK=Yes
  13 OPTIONS_SPEC=
  14 . git-sh-setup
  15 require_work_tree
  16
  17 # Returns true if the mode reflects a symlink
  18 is_symlink () {
  19     test "$1" = 120000
  20 }
  21
  22 local_present () {
  23     test -n "$local_mode"
  24 }
  25
  26 remote_present () {
  27     test -n "$remote_mode"
  28 }
  29
  30 base_present () {
  31     test -n "$base_mode"
  32 }
  33
  34 cleanup_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
  43 describe_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
  63 resolve_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 -- "$MERGED"
  77                 cleanup_temp_files --save-backup
  78                 return 0
  79                 ;;
  80             [aA]*)
  81                 return 1
  82                 ;;
  83             esac
  84         done
  85 }
  86
  87 resolve_deleted_merge () {
  88     while true; do
  89         if base_present; then
  90             printf "Use (m)odified or (d)eleted file, or (a)bort? "
  91         else
  92             printf "Use (c)reated or (d)eleted file, or (a)bort? "
  93         fi
  94         read ans
  95         case "$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
 113 check_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
 129 checkout_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
 137 merge_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 -- "$MERGED"
 299     cleanup_temp_files
 300     return 0
 301 }
 302
 303 prompt=$(git config --bool mergetool.prompt || echo true)
 304
 305 while test $# != 0
 306 do
 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="$2"
 317                     shift ;;
 318             esac
 319             ;;
 320         -y|--no-prompt)
 321             prompt=false
 322             ;;
 323         --prompt)
 324             prompt=true
 325             ;;
 326         --)
 327             shift
 328             break
 329             ;;
 330         -*)
 331             usage
 332             ;;
 333         *)
 334             break
 335             ;;
 336     esac
 337     shift
 338 done
 339
 340 valid_custom_tool()
 341 {
 342     merge_tool_cmd="$(git config mergetool.$1.cmd)"
 343     test -n "$merge_tool_cmd"
 344 }
 345
 346 valid_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
 358 init_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=$1
 373                                 ;;
 374                 esac
 375         fi
 376 }
 377
 378 prompt_after_failed_merge() {
 379     while true; do
 380         printf "Continue merging other unresolved paths (y/n) ? "
 381         read ans
 382         case "$ans" in
 383
 384             [yY]*)
 385                 return 0
 386                 ;;
 387
 388             [nN]*)
 389                 return 1
 390                 ;;
 391         esac
 392     done
 393 }
 394
 395 if 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: $merge_tool"
 399             echo >&2 "Resetting to default..."
 400             unset merge_tool
 401     fi
 402 fi
 403
 404 if test -z "$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
 431 else
 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
 450 fi
 451
 452 last_status=0
 453 rollup_status=0
 454
 455 if 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
 477 else
 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
 490 fi
 491
 492 exit $rollup_status