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