git-mergetool--lib.sh

   1 #!/bin/sh
   2 # git-mergetool--lib is a library for common merge tool functions
   3 diff_mode() {
   4         test "$TOOL_MODE" = diff
   5 }
   6
   7 merge_mode() {
   8         test "$TOOL_MODE" = merge
   9 }
  10
  11 translate_merge_tool_path () {
  12         case "$1" in
  13         vimdiff|vimdiff2)
  14                 echo vim
  15                 ;;
  16         gvimdiff|gvimdiff2)
  17                 echo gvim
  18                 ;;
  19         emerge)
  20                 echo emacs
  21                 ;;
  22         araxis)
  23                 echo compare
  24                 ;;
  25         *)
  26                 echo "$1"
  27                 ;;
  28         esac
  29 }
  30
  31 check_unchanged () {
  32         if test "$MERGED" -nt "$BACKUP"; then
  33                 status=0
  34         else
  35                 while true; do
  36                         echo "$MERGED seems unchanged."
  37                         printf "Was the merge successful? [y/n] "
  38                         read answer
  39                         case "$answer" in
  40                         y*|Y*) status=0; break ;;
  41                         n*|N*) status=1; break ;;
  42                         esac
  43                 done
  44         fi
  45 }
  46
  47 valid_tool () {
  48         case "$1" in
  49         kdiff3 | tkdiff | xxdiff | meld | opendiff | \
  50         vimdiff | gvimdiff | vimdiff2 | gvimdiff2 | \
  51         emerge | ecmerge | diffuse | araxis | p4merge)
  52                 ;; # happy
  53         tortoisemerge)
  54                 if ! merge_mode; then
  55                         return 1
  56                 fi
  57                 ;;
  58         kompare)
  59                 if ! diff_mode; then
  60                         return 1
  61                 fi
  62                 ;;
  63         *)
  64                 if test -z "$(get_merge_tool_cmd "$1")"; then
  65                         return 1
  66                 fi
  67                 ;;
  68         esac
  69 }
  70
  71 get_merge_tool_cmd () {
  72         # Prints the custom command for a merge tool
  73         if test -n "$1"; then
  74                 merge_tool="$1"
  75         else
  76                 merge_tool="$(get_merge_tool)"
  77         fi
  78         if diff_mode; then
  79                 echo "$(git config difftool.$merge_tool.cmd ||
  80                         git config mergetool.$merge_tool.cmd)"
  81         else
  82                 echo "$(git config mergetool.$merge_tool.cmd)"
  83         fi
  84 }
  85
  86 run_merge_tool () {
  87         merge_tool_path="$(get_merge_tool_path "$1")" || exit
  88         base_present="$2"
  89         status=0
  90
  91         case "$1" in
  92         kdiff3)
  93                 if merge_mode; then
  94                         if $base_present; then
  95                                 ("$merge_tool_path" --auto \
  96                                         --L1 "$MERGED (Base)" \
  97                                         --L2 "$MERGED (Local)" \
  98                                         --L3 "$MERGED (Remote)" \
  99                                         -o "$MERGED" \
 100                                         "$BASE" "$LOCAL" "$REMOTE" \
 101                                 > /dev/null 2>&1)
 102                         else
 103                                 ("$merge_tool_path" --auto \
 104                                         --L1 "$MERGED (Local)" \
 105                                         --L2 "$MERGED (Remote)" \
 106                                         -o "$MERGED" \
 107                                         "$LOCAL" "$REMOTE" \
 108                                 > /dev/null 2>&1)
 109                         fi
 110                         status=$?
 111                 else
 112                         ("$merge_tool_path" --auto \
 113                                 --L1 "$MERGED (A)" \
 114                                 --L2 "$MERGED (B)" "$LOCAL" "$REMOTE" \
 115                         > /dev/null 2>&1)
 116                 fi
 117                 ;;
 118         kompare)
 119                 "$merge_tool_path" "$LOCAL" "$REMOTE"
 120                 ;;
 121         tkdiff)
 122                 if merge_mode; then
 123                         if $base_present; then
 124                                 "$merge_tool_path" -a "$BASE" \
 125                                         -o "$MERGED" "$LOCAL" "$REMOTE"
 126                         else
 127                                 "$merge_tool_path" \
 128                                         -o "$MERGED" "$LOCAL" "$REMOTE"
 129                         fi
 130                         status=$?
 131                 else
 132                         "$merge_tool_path" "$LOCAL" "$REMOTE"
 133                 fi
 134                 ;;
 135         p4merge)
 136                 if merge_mode; then
 137                     touch "$BACKUP"
 138                         if $base_present; then
 139                                 "$merge_tool_path" "$BASE" "$LOCAL" "$REMOTE" "$MERGED"
 140                         else
 141                                 "$merge_tool_path" "$LOCAL" "$LOCAL" "$REMOTE" "$MERGED"
 142                         fi
 143                         check_unchanged
 144                 else
 145                         "$merge_tool_path" "$LOCAL" "$REMOTE"
 146                 fi
 147                 ;;
 148         meld)
 149                 if merge_mode; then
 150                         touch "$BACKUP"
 151                         "$merge_tool_path" "$LOCAL" "$MERGED" "$REMOTE"
 152                         check_unchanged
 153                 else
 154                         "$merge_tool_path" "$LOCAL" "$REMOTE"
 155                 fi
 156                 ;;
 157         diffuse)
 158                 if merge_mode; then
 159                         touch "$BACKUP"
 160                         if $base_present; then
 161                                 "$merge_tool_path" \
 162                                         "$LOCAL" "$MERGED" "$REMOTE" \
 163                                         "$BASE" | cat
 164                         else
 165                                 "$merge_tool_path" \
 166                                         "$LOCAL" "$MERGED" "$REMOTE" | cat
 167                         fi
 168                         check_unchanged
 169                 else
 170                         "$merge_tool_path" "$LOCAL" "$REMOTE" | cat
 171                 fi
 172                 ;;
 173         vimdiff|gvimdiff)
 174                 if merge_mode; then
 175                         touch "$BACKUP"
 176                         if $base_present; then
 177                                 "$merge_tool_path" -f -d -c "wincmd J" \
 178                                         "$MERGED" "$LOCAL" "$BASE" "$REMOTE"
 179                         else
 180                                 "$merge_tool_path" -f -d -c "wincmd l" \
 181                                         "$LOCAL" "$MERGED" "$REMOTE"
 182                         fi
 183                         check_unchanged
 184                 else
 185                         "$merge_tool_path" -R -f -d -c "wincmd l" \
 186                                 "$LOCAL" "$REMOTE"
 187                 fi
 188                 ;;
 189         vimdiff2|gvimdiff2)
 190                 if merge_mode; then
 191                         touch "$BACKUP"
 192                         "$merge_tool_path" -f -d -c "wincmd l" \
 193                                 "$LOCAL" "$MERGED" "$REMOTE"
 194                         check_unchanged
 195                 else
 196                         "$merge_tool_path" -R -f -d -c "wincmd l" \
 197                                 "$LOCAL" "$REMOTE"
 198                 fi
 199                 ;;
 200         xxdiff)
 201                 if merge_mode; then
 202                         touch "$BACKUP"
 203                         if $base_present; then
 204                                 "$merge_tool_path" -X --show-merged-pane \
 205                                         -R 'Accel.SaveAsMerged: "Ctrl-S"' \
 206                                         -R 'Accel.Search: "Ctrl+F"' \
 207                                         -R 'Accel.SearchForward: "Ctrl-G"' \
 208                                         --merged-file "$MERGED" \
 209                                         "$LOCAL" "$BASE" "$REMOTE"
 210                         else
 211                                 "$merge_tool_path" -X $extra \
 212                                         -R 'Accel.SaveAsMerged: "Ctrl-S"' \
 213                                         -R 'Accel.Search: "Ctrl+F"' \
 214                                         -R 'Accel.SearchForward: "Ctrl-G"' \
 215                                         --merged-file "$MERGED" \
 216                                         "$LOCAL" "$REMOTE"
 217                         fi
 218                         check_unchanged
 219                 else
 220                         "$merge_tool_path" \
 221                                 -R 'Accel.Search: "Ctrl+F"' \
 222                                 -R 'Accel.SearchForward: "Ctrl-G"' \
 223                                 "$LOCAL" "$REMOTE"
 224                 fi
 225                 ;;
 226         opendiff)
 227                 if merge_mode; then
 228                         touch "$BACKUP"
 229                         if $base_present; then
 230                                 "$merge_tool_path" "$LOCAL" "$REMOTE" \
 231                                         -ancestor "$BASE" \
 232                                         -merge "$MERGED" | cat
 233                         else
 234                                 "$merge_tool_path" "$LOCAL" "$REMOTE" \
 235                                         -merge "$MERGED" | cat
 236                         fi
 237                         check_unchanged
 238                 else
 239                         "$merge_tool_path" "$LOCAL" "$REMOTE" | cat
 240                 fi
 241                 ;;
 242         ecmerge)
 243                 if merge_mode; then
 244                         touch "$BACKUP"
 245                         if $base_present; then
 246                                 "$merge_tool_path" "$BASE" "$LOCAL" "$REMOTE" \
 247                                         --default --mode=merge3 --to="$MERGED"
 248                         else
 249                                 "$merge_tool_path" "$LOCAL" "$REMOTE" \
 250                                         --default --mode=merge2 --to="$MERGED"
 251                         fi
 252                         check_unchanged
 253                 else
 254                         "$merge_tool_path" --default --mode=diff2 \
 255                                 "$LOCAL" "$REMOTE"
 256                 fi
 257                 ;;
 258         emerge)
 259                 if merge_mode; then
 260                         if $base_present; then
 261                                 "$merge_tool_path" \
 262                                         -f emerge-files-with-ancestor-command \
 263                                         "$LOCAL" "$REMOTE" "$BASE" \
 264                                         "$(basename "$MERGED")"
 265                         else
 266                                 "$merge_tool_path" \
 267                                         -f emerge-files-command \
 268                                         "$LOCAL" "$REMOTE" \
 269                                         "$(basename "$MERGED")"
 270                         fi
 271                         status=$?
 272                 else
 273                         "$merge_tool_path" -f emerge-files-command \
 274                                 "$LOCAL" "$REMOTE"
 275                 fi
 276                 ;;
 277         tortoisemerge)
 278                 if $base_present; then
 279                         touch "$BACKUP"
 280                         "$merge_tool_path" \
 281                                 -base:"$BASE" -mine:"$LOCAL" \
 282                                 -theirs:"$REMOTE" -merged:"$MERGED"
 283                         check_unchanged
 284                 else
 285                         echo "TortoiseMerge cannot be used without a base" 1>&2
 286                         status=1
 287                 fi
 288                 ;;
 289         araxis)
 290                 if merge_mode; then
 291                         touch "$BACKUP"
 292                         if $base_present; then
 293                                 "$merge_tool_path" -wait -merge -3 -a1 \
 294                                         "$BASE" "$LOCAL" "$REMOTE" "$MERGED" \
 295                                         >/dev/null 2>&1
 296                         else
 297                                 "$merge_tool_path" -wait -2 \
 298                                         "$LOCAL" "$REMOTE" "$MERGED" \
 299                                         >/dev/null 2>&1
 300                         fi
 301                         check_unchanged
 302                 else
 303                         "$merge_tool_path" -wait -2 "$LOCAL" "$REMOTE" \
 304                                 >/dev/null 2>&1
 305                 fi
 306                 ;;
 307         *)
 308                 merge_tool_cmd="$(get_merge_tool_cmd "$1")"
 309                 if test -z "$merge_tool_cmd"; then
 310                         if merge_mode; then
 311                                 status=1
 312                         fi
 313                         break
 314                 fi
 315                 if merge_mode; then
 316                         trust_exit_code="$(git config --bool \
 317                                 mergetool."$1".trustExitCode || echo false)"
 318                         if test "$trust_exit_code" = "false"; then
 319                                 touch "$BACKUP"
 320                                 ( eval $merge_tool_cmd )
 321                                 check_unchanged
 322                         else
 323                                 ( eval $merge_tool_cmd )
 324                                 status=$?
 325                         fi
 326                 else
 327                         ( eval $merge_tool_cmd )
 328                 fi
 329                 ;;
 330         esac
 331         return $status
 332 }
 333
 334 guess_merge_tool () {
 335         if merge_mode; then
 336                 tools="tortoisemerge"
 337         else
 338                 tools="kompare"
 339         fi
 340         if test -n "$DISPLAY"; then
 341                 if test -n "$GNOME_DESKTOP_SESSION_ID" ; then
 342                         tools="meld opendiff kdiff3 tkdiff xxdiff $tools"
 343                 else
 344                         tools="opendiff kdiff3 tkdiff xxdiff meld $tools"
 345                 fi
 346                 tools="$tools gvimdiff diffuse ecmerge p4merge araxis"
 347         fi
 348         case "${VISUAL:-$EDITOR}" in
 349         *vim*)
 350                 tools="$tools vimdiff emerge"
 351                 ;;
 352         *)
 353                 tools="$tools emerge vimdiff"
 354                 ;;
 355         esac
 356         echo >&2 "merge tool candidates: $tools"
 357
 358         # Loop over each candidate and stop when a valid merge tool is found.
 359         for i in $tools
 360         do
 361                 merge_tool_path="$(translate_merge_tool_path "$i")"
 362                 if type "$merge_tool_path" > /dev/null 2>&1; then
 363                         echo "$i"
 364                         return 0
 365                 fi
 366         done
 367
 368         echo >&2 "No known merge resolution program available."
 369         return 1
 370 }
 371
 372 get_configured_merge_tool () {
 373         # Diff mode first tries diff.tool and falls back to merge.tool.
 374         # Merge mode only checks merge.tool
 375         if diff_mode; then
 376                 merge_tool=$(git config diff.tool || git config merge.tool)
 377         else
 378                 merge_tool=$(git config merge.tool)
 379         fi
 380         if test -n "$merge_tool" && ! valid_tool "$merge_tool"; then
 381                 echo >&2 "git config option $TOOL_MODE.tool set to unknown tool: $merge_tool"
 382                 echo >&2 "Resetting to default..."
 383                 return 1
 384         fi
 385         echo "$merge_tool"
 386 }
 387
 388 get_merge_tool_path () {
 389         # A merge tool has been set, so verify that it's valid.
 390         if test -n "$1"; then
 391                 merge_tool="$1"
 392         else
 393                 merge_tool="$(get_merge_tool)"
 394         fi
 395         if ! valid_tool "$merge_tool"; then
 396                 echo >&2 "Unknown merge tool $merge_tool"
 397                 exit 1
 398         fi
 399         if diff_mode; then
 400                 merge_tool_path=$(git config difftool."$merge_tool".path ||
 401                                   git config mergetool."$merge_tool".path)
 402         else
 403                 merge_tool_path=$(git config mergetool."$merge_tool".path)
 404         fi
 405         if test -z "$merge_tool_path"; then
 406                 merge_tool_path="$(translate_merge_tool_path "$merge_tool")"
 407         fi
 408         if test -z "$(get_merge_tool_cmd "$merge_tool")" &&
 409         ! type "$merge_tool_path" > /dev/null 2>&1; then
 410                 echo >&2 "The $TOOL_MODE tool $merge_tool is not available as"\
 411                          "'$merge_tool_path'"
 412                 exit 1
 413         fi
 414         echo "$merge_tool_path"
 415 }
 416
 417 get_merge_tool () {
 418         # Check if a merge tool has been configured
 419         merge_tool=$(get_configured_merge_tool)
 420         # Try to guess an appropriate merge tool if no tool has been set.
 421         if test -z "$merge_tool"; then
 422                 merge_tool="$(guess_merge_tool)" || exit
 423         fi
 424         echo "$merge_tool"
 425 }