Merge pull request #1 from mars/react-app-env-vars

Support custom `REACT_APP_*` env vars during build

bin/compile

@@ -15,6 +15,19 @@ CACHE_DIR=$2
 ENV_DIR=$3
 BP_DIR=`cd $(dirname $0); cd ..; pwd`
 
+export_env_dir() {
+  local env_dir=$1
+  local whitelist_regex=${2:-''}
+  local blacklist_regex=${3:-'^(PATH|GIT_DIR|CPATH|CPPATH|LD_PRELOAD|LIBRARY_PATH|IFS)$'}
+  if [ -d "$env_dir" ]; then
+    for e in $(ls $env_dir); do
+      echo "$e" | grep -E "$whitelist_regex" | grep -qvE "$blacklist_regex" &&
+      export "$e=$(cat $env_dir/$e)"
+      :
+    done
+  fi
+}
+
 cd $BUILD_DIR
 
 # Set the web root to the build/ directory
@@ -26,5 +39,9 @@ else
   echo '{ "root": "build/" }' > static.json
 fi
 
+# Support custom `REACT_APP_*` env vars during build.
+# https://github.com/facebookincubator/create-react-app/blob/v0.2.3/template/README.md#adding-custom-environment-variables
+export_env_dir "$ENV_DIR" '^REACT_APP_'
+
 # Build the javascript bundle
 npm run build