diff --git a/.gitignore b/.gitignore
index f2c451d..c06397f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,7 @@
 build/**
 !build/.gitignore
 !build/ci/Dockerfile
+!build/utils.sh
 src/greeter-resources.h
 src/config.h
 cmake-build-debug
diff --git a/build/utils.sh b/build/utils.sh
new file mode 100755
index 0000000..8ee57a2
--- /dev/null
+++ b/build/utils.sh
@@ -0,0 +1,28 @@
+#!/bin/bash
+
+
+combine_javascript_sources() {
+	cd "${MESON_SOURCE_ROOT}/src/gresource/js" && {
+		cat _vendor/moment-with-locales.min.js \
+			LightDMObjects.js \
+			Greeter.js \
+			GreeterConfig.js \
+			ThemeUtils.js \
+			ThemeHeartbeat.js > bundle.js
+	}
+}
+
+list_javascript_sources() {
+	cd "${MESON_SOURCE_ROOT}/src" && find gresource/js -type f -name '*.js' -print
+}
+
+
+case "$1" in
+	combine-js)
+		combine_javascript_sources
+	;;
+
+	get-js-files)
+		list_javascript_sources
+	;;
+esac
diff --git a/circle.yml b/circle.yml
index 3905ed4..ceb76ed 100644
--- a/circle.yml
+++ b/circle.yml
@@ -7,9 +7,9 @@ dependencies:
   cache_directories:
     - ~/docker
   override:
-    - if [[ -e ~/docker/image.tar ]]; then docker load -i ~/docker/image.tar; fi
-    - docker build --rm=false -t antergos/ci-ubuntu build/ci
-    - mkdir -p ~/docker; docker save antergos/ci-ubuntu > ~/docker/image.tar
+    - '[[ -e ~/docker/image.tar ]] && docker load -i ~/docker/image.tar'
+    - '[[ -e ~/docker/image.tar ]] || docker build --rm=false -t antergos/ci-ubuntu build/ci'
+    - '[[ -e ~/docker/image.tar ]] || mkdir -p ~/docker; docker save antergos/ci-ubuntu > ~/docker/image.tar'
 
 test:
   override: