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