Add option to watch for changes to css

README.md

@@ -13,8 +13,14 @@
 
 ## Running (development)
 
+To start the app and watch for changes:
+
     DEBUG=1 ./app.py
 
+To rebuild css whenever the scss changes:
+
+    ./gen-css --watch
+
 ## Notes
 
 tornado templates are like mustache templates -- add the

gen-css

@@ -1,5 +1,14 @@
-#!/bin/sh -x
+#!/bin/sh
+
+opts=$1
 
 cp -a node_modules/uswds/dist/fonts static/
-sass scss/atat.scss > static/assets/atat.css
+
+if [ "$opts" == "--watch" ]; then
+    set -x
+    sass --watch scss/atat.scss:static/assets/atat.css
+else
+    set -x
+    sass scss/atat.scss > static/assets/atat.css
+fi