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 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         xxdiff)
 219             touch "$BACKUP"
 220             if base_present ; then
 221                 xxdiff -X --show-merged-pane \
 222                     -R 'Accel.SaveAsMerged: "Ctrl-S"' \
 223                     -R 'Accel.Search: "Ctrl+F"' \
 224                     -R 'Accel.SearchForward: "Ctrl-G"' \
 225                     --merged-file "$path" -- "$LOCAL" "$BASE" "$REMOTE"
 226             else
 227                 xxdiff -X --show-merged-pane \
 228                     -R 'Accel.SaveAsMerged: "Ctrl-S"' \
 229                     -R 'Accel.Search: "Ctrl+F"' \
 230                     -R 'Accel.SearchForward: "Ctrl-G"' \
 231                     --merged-file "$path" -- "$LOCAL" "$REMOTE"
 232             fi
 233             check_unchanged
 234             save_backup
 235             ;;
 236         opendiff)
 237             touch "$BACKUP"
 238             if base_present; then
 239                 opendiff "$LOCAL" "$REMOTE" -ancestor "$BASE" -merge "$path" | cat
 240             else
 241                 opendiff "$LOCAL" "$REMOTE" -merge "$path" | cat
 242             fi
 243             check_unchanged
 244             save_backup
 245             ;;
 246         emerge)
 247             if base_present ; then
 248                 emacs -f emerge-files-with-ancestor-command "$LOCAL" "$REMOTE" "$BASE" "$path"
 249             else
 250                 emacs -f emerge-files-command "$LOCAL" "$REMOTE" "$path"
 251             fi
 252             status=$?
 253             save_backup
 254             ;;
 255     esac
 256     if test "$status" -ne 0; then
 257         echo "merge of $path failed" 1>&2
 258         mv -- "$BACKUP" "$path"
 259         exit 1
 260     fi
 261     git add -- "$path"
 262     cleanup_temp_files
 263 }
 264
 265 while case $# in 0) break ;; esac
 266 do
 267     case "$1" in
 268         -t|--tool*)
 269             case "$#,$1" in
 270                 *,*=*)
 271                     merge_tool=`expr "z$1" : 'z-[^=]*=\(.*\)'`
 272                     ;;
 273                 1,*)
 274                     usage ;;
 275                 *)
 276                     merge_tool="$2"
 277                     shift ;;
 278             esac
 279             ;;
 280         --)
 281             break
 282             ;;
 283         -*)
 284             usage
 285             ;;
 286         *)
 287             break
 288             ;;
 289     esac
 290     shift
 291 done
 292
 293 if test -z "$merge_tool"; then
 294     merge_tool=`git-config merge.tool`
 295     case "$merge_tool" in
 296         kdiff3 | tkdiff | xxdiff | meld | opendiff | emerge | vimdiff | "")
 297             ;; # happy
 298         *)
 299             echo >&2 "git config option merge.tool set to unknown tool: $merge_tool"
 300             echo >&2 "Resetting to default..."
 301             unset merge_tool
 302             ;;
 303     esac
 304 fi
 305
 306 if test -z "$merge_tool" ; then
 307     if type kdiff3 >/dev/null 2>&1 && test -n "$DISPLAY"; then
 308         merge_tool="kdiff3";
 309     elif type tkdiff >/dev/null 2>&1 && test -n "$DISPLAY"; then
 310         merge_tool=tkdiff
 311     elif type xxdiff >/dev/null 2>&1 && test -n "$DISPLAY"; then
 312         merge_tool=xxdiff
 313     elif type meld >/dev/null 2>&1 && test -n "$DISPLAY"; then
 314         merge_tool=meld
 315     elif type opendiff >/dev/null 2>&1; then
 316         merge_tool=opendiff
 317     elif type emacs >/dev/null 2>&1; then
 318         merge_tool=emerge
 319     elif type vimdiff >/dev/null 2>&1; then
 320         merge_tool=vimdiff
 321     else
 322         echo "No available merge resolution programs available."
 323         exit 1
 324     fi
 325 fi
 326
 327 case "$merge_tool" in
 328     kdiff3|tkdiff|meld|xxdiff|vimdiff|opendiff)
 329         if ! type "$merge_tool" > /dev/null 2>&1; then
 330             echo "The merge tool $merge_tool is not available"
 331             exit 1
 332         fi
 333         ;;
 334     emerge)
 335         if ! type "emacs" > /dev/null 2>&1; then
 336             echo "Emacs is not available"
 337             exit 1
 338         fi
 339         ;;
 340     *)
 341         echo "Unknown merge tool: $merge_tool"
 342         exit 1
 343         ;;
 344 esac
 345
 346 if test $# -eq 0 ; then
 347         files=`git ls-files -u | sed -e 's/^[^  ]*      //' | sort -u`
 348         if test -z "$files" ; then
 349                 echo "No files need merging"
 350                 exit 0
 351         fi
 352         echo Merging the files: $files
 353         git ls-files -u | sed -e 's/^[^ ]*      //' | sort -u | while read i
 354         do
 355                 printf "\n"
 356                 merge_file "$i" < /dev/tty > /dev/tty
 357         done
 358 else
 359         while test $# -gt 0; do
 360                 printf "\n"
 361                 merge_file "$1"
 362                 shift
 363         done
 364 fi
 365 exit 0