Do a version compare to support older and newer versions of docker-co…

…mpose. (#29)

dsh

@@ -17,6 +17,12 @@ export NGINX_PORT=$(docker port nginx-proxy | awk -F ':' '{print $2}')
 
 # Used as the prefix for docker networking, container naming and nginx hostname.
 export PROJECT=$(basename ${PWD})
+# docker-compose stopped stripping chars from project name in 1.21.0.
+export DOCKER_COMPOSE_VERSION=$(docker-compose -v | awk '{print $3}' | rev | cut -c 2- | rev)
+function version { echo "$@" | awk -F. '{ printf("%d%03d%03d%03d\n", $1,$2,$3,$4); }'; }
+if [ $(version ${DOCKER_COMPOSE_VERSION}) -lt $(version "1.21.0") ]; then
+  export PROJECT=$(echo ${PROJECT} | sed 's/[-_]//g')
+fi
 
 # Determine the OS type of the host machine.
 if [ "$(uname)" == "Darwin" ]; then