Automatically generate sample barcode

runs on `yarn build`

package.json

@@ -56,6 +56,7 @@
     "jest": "^22.4.3",
     "react-test-renderer": "^16.3.2",
     "webpack-bundle-analyzer": "^2.11.1",
-    "webpack-dev-server": "^3.1.3"
+    "webpack-dev-server": "^3.1.3",
+    "webpack-shell-plugin": "^0.5.0"
   }
 }

webpack.common.js

@@ -10,6 +10,7 @@ const HtmlWebpackPluginConfig = new HtmlWebpackPlugin({
   filename: 'index.html',
   inject: 'body'
 })
+const WebpackShellPlugin = require('webpack-shell-plugin');
 
 module.exports = {
   entry: './client/index.jsx',
@@ -27,5 +28,11 @@ module.exports = {
     ]
   },
 
-  plugins: [HtmlWebpackPluginConfig]
+  plugins: [
+      HtmlWebpackPluginConfig,
+      new WebpackShellPlugin({
+        onBuildStart: ['echo "generate sample barcode"'],
+        onBuildEnd: ['python zesje/helpers/pdf_generation_helper.py']
+      })
+    ]
   }

zesje/helpers/pdf_generation_helper.py

@@ -241,3 +241,9 @@ def _add_corner_markers(canv, pagesize, margin=10):
         (left, top, left + length, top),
         (left, top, left, top - length)
     ])
+
+
+if __name__ == "__main__":
+    output_dir = 'zesje/static'
+    image = generate_datamatrix('some_id', 1, 0)
+    image.save(os.path.join(output_dir, 'barcode_example.png'))