IMU/Multi: define generic Components that initializes and defines get…

… accessors for IMU controller wrappers, based on components property value

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

lib/imu.js

@@ -19,6 +19,59 @@ var activeDrivers = new Map();
 
 // The presense of this magic number is for computing meters from pressure and elevation (in meters)
 // 0.0000225577
+// TODO: make real const
+var ACCELEROMETER = "accelerometer";
+var ALTIMETER = "altimeter";
+var BAROMETER = "barometer";
+var GYRO = "gyro";
+var HYGROMETER = "hygrometer";
+var MAGNETOMETER = "magnetometer";
+var ORIENTATION = "orientation";
+var THERMOMETER = "thermometer";
+
+
+function Components(controller, options) {
+  var state = priv.get(this);
+  var descriptors = Object.create(null);
+
+  this.components.forEach(function(component) {
+
+    // TODO: Can this be put inside the get accessor?
+    // - Lazy init?
+    state[component] = new Components[component](
+      Object.assign({
+        controller: options.controller || controller,
+        freq: options.freq,
+        board: this.board,
+      }, options)
+    );
+
+    descriptors[component] = {
+      get: function() {
+        return state[component];
+      }
+    };
+
+    if (backwardCompatibilityGarbageHacks[component]) {
+      descriptors[backwardCompatibilityGarbageHacks[component]] = descriptors[component];
+    }
+  });
+
+  Object.defineProperties(this, descriptors);
+}
+
+Components.accelerometer = require("./accelerometer");
+Components.altimeter = require("./altimeter");
+Components.barometer = require("./barometer");
+Components.gyro = require("./gyro");
+Components.hygrometer = require("./hygrometer");
+Components.magnetometer = require("./compass");
+Components.orientation = require("./orientation");
+Components.thermometer = require("./thermometer");
+
+var backwardCompatibilityGarbageHacks = {
+  thermometer: "temperature",
+};
 
 var Drivers = {
   // https://cdn-shop.adafruit.com/product-files/2857/Sensirion_Humidity_SHT3x_Datasheet_digital-767294.pdf