bump mill to 0.5.0

mill

@@ -3,12 +3,18 @@
 # This is a wrapper script, that automatically download mill from GitHub release pages
 # You can give the required mill version with MILL_VERSION env variable
 # If no version is given, it falls back to the value of DEFAULT_MILL_VERSION
-DEFAULT_MILL_VERSION=0.4.2
+DEFAULT_MILL_VERSION=0.5.0
 
 set -e
 
 if [ -z "$MILL_VERSION" ] ; then
-  MILL_VERSION=$DEFAULT_MILL_VERSION
+  if [ -f ".mill-version" ] ; then
+    MILL_VERSION="$(head -n 1 .mill-version 2> /dev/null)"
+  elif [ -f "mill" ] && [ "$BASH_SOURCE" != "mill" ] ; then
+    MILL_VERSION=$(grep -F "DEFAULT_MILL_VERSION=" "mill" | head -n 1 | cut -d= -f2)
+  else
+    MILL_VERSION=$DEFAULT_MILL_VERSION
+  fi
 fi
 
 MILL_DOWNLOAD_PATH="$HOME/.mill/download"
@@ -17,10 +23,9 @@ MILL_EXEC_PATH="${MILL_DOWNLOAD_PATH}/$MILL_VERSION"
 if [ ! -x "$MILL_EXEC_PATH" ] ; then
   mkdir -p $MILL_DOWNLOAD_PATH
   DOWNLOAD_FILE=$MILL_EXEC_PATH-tmp-download
-  MILL_DOWNLOAD_URL="https://github.com/lihaoyi/mill/releases/download/${MILL_VERSION%%-*}/$MILL_VERSION"
+  MILL_DOWNLOAD_URL="https://github.com/lihaoyi/mill/releases/download/${MILL_VERSION%%-*}/$MILL_VERSION-assembly"
   curl --fail -L -o "$DOWNLOAD_FILE" "$MILL_DOWNLOAD_URL"
   chmod +x "$DOWNLOAD_FILE"
-  mkdir -p "$MILL_DOWNLOAD_PATH"
   mv "$DOWNLOAD_FILE" "$MILL_EXEC_PATH"
   unset DOWNLOAD_FILE
   unset MILL_DOWNLOAD_URL
@@ -29,4 +34,4 @@ fi
 unset MILL_DOWNLOAD_PATH
 unset MILL_VERSION
 
-exec $MILL_EXEC_PATH "$@"
+exec $MILL_EXEC_PATH "$@"