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