add log.js module for renderer logging

main/log.js

@@ -0,0 +1,31 @@
+module.exports = log
+module.exports.error = error
+
+/**
+ * In the main electron process, we do not use console.log() statements because they do
+ * not show up in a convenient location when running the packaged (i.e. production)
+ * version of the app. Instead use this module, which sends the logs to the main window
+ * where they can be viewed in Developer Tools.
+ */
+
+var electron = require('electron')
+
+var windows = require('./windows')
+
+var app = electron.app
+
+function log (...args) {
+  if (app.ipcReady) {
+    windows.main.send('log', ...args)
+  } else {
+    app.on('ipcReady', () => windows.main.send('log', ...args))
+  }
+}
+
+function error (...args) {
+  if (app.ipcReady) {
+    windows.main.send('error', ...args)
+  } else {
+    app.on('ipcReady', () => windows.main.send('error', ...args))
+  }
+}