Merge pull request #2980 from urbit/lf/webpack-qol

interface: improve webpack dev config

pkg/interface/config/urbitrc-sample

@@ -1,5 +1,6 @@
 module.exports = {
   URBIT_PIERS: [
     "/Users/user/ships/zod/home",
-  ]
+  ],
+  herb: false
 };

pkg/interface/config/webpack.dev.js

@@ -2,6 +2,41 @@ const path = require('path');
 // const HtmlWebpackPlugin = require('html-webpack-plugin');
 // const { CleanWebpackPlugin } = require('clean-webpack-plugin');
 const urbitrc = require('./urbitrc');
+const fs = require('fs');
+const util = require('util');
+const exec = util.promisify(require('child_process').exec);
+
+function copyFile(src,dest) {
+  return new Promise((res,rej) =>
+    fs.copyFile(src,dest, err => err ? rej(err) : res()));
+}
+
+class UrbitShipPlugin {
+  constructor(urbitrc) {
+    this.piers = urbitrc.URBIT_PIERS;
+    this.herb = urbitrc.herb || false;
+  }
+
+  apply(compiler) {
+    compiler.hooks.afterCompile.tapPromise(
+      'UrbitShipPlugin',
+      async (compilation) => {
+        const src = path.resolve(compiler.options.output.path, 'index.js');
+        return Promise.all(this.piers.map(pier => {
+          const dst = path.resolve(pier, 'app/landscape/js/index.js');
+          copyFile(src, dst).then(() => {
+            if(!this.herb) {
+              return;
+            }
+            pier = pier.split('/');
+            const desk = pier.pop();
+            return exec(`herb -p hood -d '+hood/commit %${desk}' ${pier.join('/')}`);
+          });
+        }));
+      }
+    )
+  }
+}
 
 module.exports = {
   mode: 'development',
@@ -49,16 +84,18 @@ module.exports = {
   //   historyApiFallback: true
   // },
   plugins: [
+    new UrbitShipPlugin(urbitrc)
     // new CleanWebpackPlugin(),
     // new HtmlWebpackPlugin({
     //   title: 'Hot Module Replacement',
     //   template: './public/index.html',
     // }),
   ],
+  watch: true,
   output: {
     filename: 'index.js',
     chunkFilename: 'index.js',
-    path: path.resolve(urbitrc.URBIT_PIERS[0] + '/app/landscape/', 'js'),
+    path: path.resolve(__dirname, '../dist'),
     publicPath: '/'
   },
   optimization: {