wip: use right launcher in bin/scala

bin/common

@@ -9,15 +9,43 @@ target="$1"
 
 shift # Mutates $@ by deleting the first element ($1)
 
+unset cygwin mingw msys darwin
+
+# COLUMNS is used together with command line option '-pageWidth'.
+if command -v tput >/dev/null 2>&1; then
+  export COLUMNS="$(tput -Tdumb cols)"
+fi
+
+case "`uname`" in
+  CYGWIN*) cygwin=true
+          ;;
+  MINGW*) mingw=true
+          ;;
+  MSYS*) msys=true
+          ;;
+  Darwin*) darwin=true
+           ;;
+esac
+
+unset DIST_PROJECT DIST_DIR
+
+if [[ ${cygwin-} || ${mingw-} || ${msys-} ]]; then
+  DIST_PROJECT="dist-win-x64"
+  DIST_DIR="dist/win-x64"
+else
+  DIST_PROJECT="dist"
+  DIST_DIR="dist"
+fi
+
 # Marker file used to obtain the date of latest call to sbt-back
-version="$ROOT/dist/target/pack/VERSION"
+version="$ROOT/$DIST_DIR/target/pack/VERSION"
 
 # Create the target if absent or if file changed in ROOT/compiler
 new_files="$(find "$ROOT/compiler" \( -iname "*.scala" -o -iname "*.java" \) -newer "$version" 2> /dev/null)"
 
 if [ ! -f "$version" ] || [ ! -z "$new_files" ]; then
   echo "Building Dotty..."
-  (cd $ROOT && sbt "dist/pack")
+  (cd $ROOT && sbt "$DIST_PROJECT/pack")
 fi
 
-"$target" "$@"
+"$ROOT/$DIST_DIR/target/pack/bin/$target" "$@"

bin/scala

@@ -35,4 +35,4 @@ scala_args() {
   echo "--power ${CLI_ARGS[@]} ${SCRIPT_ARGS[@]}"
 }
 
-"$ROOT/bin/common" "$ROOT/dist/target/pack/bin/scala" $(scala_args "$@")
+"$ROOT/bin/common" "scala" $(scala_args "$@")

bin/scalac

@@ -2,4 +2,4 @@
 
 ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")" >& /dev/null && pwd)/.."
 
-"$ROOT/bin/common" "$ROOT/dist/target/pack/bin/scalac" "$@"
+"$ROOT/bin/common" "scalac" "$@"

bin/scaladoc

@@ -2,4 +2,4 @@
 
 ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")" >& /dev/null && pwd)/.."
 
-"$ROOT/bin/common" "$ROOT/dist/target/pack/bin/scaladoc" "$@"
+"$ROOT/bin/common" "scaladoc" "$@"

dist/bin/scala

@@ -61,6 +61,7 @@ eval "${SCALA_CLI_CMD_BASH[@]}" \
   "--cli-default-scala-version \"$SCALA_VERSION\"" \
   "-r \"$MVN_REPOSITORY\"" \
   "${scala_args[@]}"
+
 scala_exit_status=$?
 
 onExit

dist/bin/scala.bat

@@ -19,6 +19,8 @@ if not %_EXITCODE%==0 goto end
 
 call :setScalaOpts
 
+call "%_PROG_HOME%\bin\cli-common-platform.bat"
+
 @rem SCALA_CLI_CMD_WIN is an array, set in cli-common-platform.bat
 call %SCALA_CLI_CMD_WIN% "--prog-name" "scala" "--cli-default-scala-version" "%_SCALA_VERSION%" "-r" "%MVN_REPOSITORY%" %*
 
@@ -41,20 +43,8 @@ if not "%char%"==":" (
   goto :findColon
 )
 
-@REM set _PROG_HOME to the substring from the first colon to the end
-set "_PROG_HOME_SUB=!_PROG_HOME:~%index%!"
-@REM strip initial character
-set "_PROG_HOME_SUB=!_PROG_HOME_SUB:~1!"
-
-@REM set drive to substring from 0 to the first colon
-set "_PROG_HOME_DRIVE=!_PROG_HOME:~0,%index%!"
-
-
-
 set "_SCALA_VERSION="
-set "MVN_REPOSITORY=file://%_PROG_HOME_DRIVE%\%_PROG_HOME_SUB:\=/%/maven2"
-
-call "%_PROG_HOME%\bin\cli-common-platform.bat"
+set "MVN_REPOSITORY=file:///%_PROG_HOME:\=/%/maven2"
 
 @rem read for version:=_SCALA_VERSION in VERSION_FILE
 FOR /F "usebackq delims=" %%G IN ("%_PROG_HOME%\VERSION") DO (