modif watch script to watch_plotly,

- run with `npm run watch`
- supports 'require' (for test_dashboard)

Author: etpinard

tasks/util/format_bundle_msg.js

@@ -0,0 +1,39 @@
+var prettySize = require('prettysize');
+
+
+/** 
+ *  Format the on-bundle output message
+ *
+ * @param {browserify instance} b
+ * @param {string} bundleName name of the bundle built
+ */
+module.exports = function formatBundleMsg(b, bundleName) {
+    var msgParts = [
+        bundleName, ':', '',
+        'written', 'in', '', 'sec',
+        '[', '', '', '', ']'
+    ];
+
+    b.on('bytes', function(bytes) { 
+        msgParts[2] = prettySize(bytes, true); 
+    });
+
+    b.on('time', function(time) {
+        msgParts[5] = (time / 1000).toFixed(2);
+    });
+
+    b.on('log', function() { 
+        var date = new Date();
+
+        // get locale date
+        msgParts[msgParts.length-4] = date.toLocaleDateString();
+
+        // get locale time
+        msgParts[msgParts.length-3] = date.toLocaleTimeString();
+
+        // get time zone code
+        msgParts[msgParts.length-2] = date.toString().match(/\(([A-Za-z\s].*)\)/)[1];
+
+        console.log(msgParts.join(' '));
+    });
+};

tasks/util/set_watchify_output.js

@@ -0,0 +1,63 @@
+var fs = require('fs');
+
+var browserify = require('browserify');
+var watchify = require('watchify');
+
+var compressAttributes = require('./util/compress_attributes');
+var formatBundleMsg = require('./util/format_bundle_msg');
+var constants = require('./util/constants');
+
+/**
+ * Make a browserify bundle function watched by watchify.
+ *
+ * @param {function} onFirstBundleCallback executed when first bundle is completed
+ *
+ */
+function makeWatchifiedBundle(onFirstBundleCallback) {
+    var b = browserify(constants.pathToPlotlySrc, {
+        debug: true,
+        standalone: 'Plotly',
+        transform: [compressAttributes],
+        cache: {},
+        packageCache: {},
+        plugin: [watchify]
+    });
+
+    var firstBundle = true;
+
+    if(firstBundle) {
+        console.log([
+            '***',
+            'Building the first bundle, this should take ~10 seconds',
+            '***\n'
+        ].join(' '));
+    }
+
+    b.on('update', bundle);
+    formatBundleMsg(b, 'plotly.js');
+
+    function bundle() {
+        b.bundle(function(err) {
+            if(err) console.error(JSON.stringify(String(err)));
+
+            if(firstBundle) {
+                onFirstBundleCallback();
+                firstBundle = false;
+            }
+        })
+        .pipe(
+            fs.createWriteStream(constants.pathToPlotlyDist)
+        );
+    }
+
+    return bundle;
+}
+
+// call watchifiedBundle if ran in CLI
+if(process.argv[1] === __filename) {
+    var watchifiedBundle = makeWatchifiedBundle(function() {});
+    watchifiedBundle();
+}
+
+// export if required in
+module.exports = makeWatchifiedBundle;