super asset copy / watch WIP, but getting closer

API change to put clean inside options, coinciding with watch
stubbed in serve

Author: bmuenzenmeyer

core/lib/asset_copy.js

@@ -41,11 +41,18 @@ const asset_copier = () => {
       dest,
       options
     ).on(copy.events.COPY_FILE_COMPLETE, (copyOperation) => {
-      console.log(`Moved ${p} to ${dest}`);
+      if (options.debug) {
+        console.log(`Moved ${p} to ${dest}`);
+      }
+      options.emitter.emit('patternlab-file-change', {
+        file: p,
+        dest: dest
+      });
     });
   };
 
   const asset_copy = (assetDirectories, patternlab, options) => {
+
     //take our configured paths and sanitize best we can to only the assets
     const dirs = transform_paths(assetDirectories);
 
@@ -54,24 +61,26 @@ const asset_copier = () => {
 
     const copyOptions =
       {
-        overwrite: true
+        overwrite: true,
+        emitter: patternlab.events,
+        debug: patternlab.config.debug
       };
 
-      console.log(60, dirs)
-
     //loop through each directory asset object (source / public pairing)
     _.each(dirs, (dir, key) => {
 
       //if we want to watch files, do so, otherwise just copy each file
       if (options.watch) {
-        console.log(49, `watching ${path.resolve(basePath, dir.source)}`);
+        if (patternlab.config.debug) {
+          console.log(`Pattern Lab is watching ${path.resolve(basePath, dir.source)} for changes`);
+        }
         const watcher = chokidar.watch(
           path.resolve(basePath, dir.source),
           {
             ignored: /(^|[\/\\])\../,
             ignoreInitial: true,
             awaitWriteFinish : {
-              stabilityThreshold: 1000,
+              stabilityThreshold: 200,
               pollInterval: 100
             }
           }
@@ -95,6 +104,15 @@ const asset_copier = () => {
         copyFile(dir.source, destination, copyOptions);
       }
     });
+
+
+    //we need to special case patterns/**/*.md|.json|.pattern-extensions
+    if (options.watch) {
+      console.log(111, basePath, assetDirectories.source.patterns)
+      const patterns = patternlab.engines.getSupportedFileExtensions().map(dotExtension => path.join(basePath, assetDirectories.source.patterns, `/**/*${dotExtension}`));
+      console.log(112, patterns);
+    }
+
   };
 
   return {

core/lib/patternlab.js

@@ -36,6 +36,7 @@ let fs = require('fs-extra'); // eslint-disable-line
 let ui_builder = require('./ui_builder'); // eslint-disable-line
 let pattern_exporter = new pe(); // eslint-disable-line
 let assetCopier = require('./asset_copy'); // eslint-disable-line
+let serve = require('./serve'); // eslint-disable-line
 
 const pattern_assembler = new pa();
 const lineage_hunter = new lh();
@@ -661,15 +662,15 @@ const patternlab_engine = function (config) {
     v: function () {
       return getVersion();
     },
-    build: function (callback, deletePatternDir, options) {
+    build: function (callback, options) {
       if (patternlab && patternlab.isBusy) {
         console.log('Pattern Lab is busy building a previous run - returning early.');
         return Promise.resolve();
       }
       patternlab.isBusy = true;
-      return buildPatterns(deletePatternDir).then(() => {
+      return buildPatterns(options.cleanPublic).then(() => {
         new ui_builder().buildFrontend(patternlab);
-        assetCopier().copyAssets(patternlab.config.paths, patternlab, {watch: false});
+        assetCopier().copyAssets(patternlab.config.paths, patternlab, options);
         printDebug();
         patternlab.isBusy = false;
         callback();
@@ -701,7 +702,14 @@ const patternlab_engine = function (config) {
     },
     getSupportedTemplateExtensions: function () {
       return getSupportedTemplateExtensions();
-    }
+    },
+    serve: function (options) {
+      options.watch = true;
+      return this.build(() => {}, options).then(function () {
+        serve(patternlab);
+      });
+    },
+    events: patternlab.events
   };
 };
 

core/lib/serve.js

@@ -0,0 +1,14 @@
+"use strict";
+const plutils = require('./utilities');
+const path = require('path');
+const process = require('process');
+const assetCopier = require('./asset_copy');
+
+let copy = require('recursive-copy'); // eslint-disable-line
+let chokidar = require('chokidar'); // eslint-disable-line
+
+const serve = (patternlab) => {
+  console.log('serve');
+};
+
+module.exports = serve;