gpsmagcourse: Add settings (untested)

apps/gpsmagcourse/settings.js

@@ -0,0 +1,91 @@
+(function(back) {
+  var FILE = "gpsmagcourse.json";
+  // Load settings
+  const settings = Object.assign({
+    speed: 6, // when lower then this use direction from compass
+    compassSrc: 1, // [off, built-in, magnav]
+    resetCompassOnPwr: true, // reset compass on power on
+    tiltCompensation: true, // tilt compensation on built-in compass
+    showWidget: 2, // 0 = never, 1 = when replacing GPS course with compass course, 2 = when GPS is on
+  }, require("Storage").readJSON(FILE, true) || {});
+
+  let magnavInstalled = true;
+  // Check if magnav is installed
+  try {
+    require("magnav");
+  } catch(err) {
+    // not installed
+    magnavInstalled = false;
+  }
+
+  if (!magnavInstalled) {
+    // adjust settings to work without magnav
+    if (settings.compassSrc === 2) {
+      settings.compassSrc = 1;
+    }
+    if (settings.tiltCompensation) {
+      settings.tiltCompensation = false;
+    }
+  }
+  const compassSrcOpts = ["off", "built-in"];
+  if (magnavInstalled) {
+    compassSrcOpts.push("magnav");
+  }
+
+  function writeSettings() {
+    require('Storage').writeJSON(FILE, settings);
+  }
+
+  const menu = {
+    "" : { "title" : /*LANG*/"GPS/Comp. course" },
+    "< Back" : () => back(),
+    /*LANG*/'Speed threshold': {
+      value: settings.speed,
+      min: 1, max: 20,
+      onchange: v => {
+        settings.speed = v;
+        writeSettings();
+      }
+    },
+    /*LANG*/'Compass source': {
+      value: settings.compassSrc,
+      min: 0, max: compassSrcOpts.length-1,
+      format: v => compassSrcOpts[v],
+      onchange: v => {
+        settings.compassSrc = v;
+        writeSettings();
+      }
+    },
+    /*LANG*/'Reset compass when powered on': {
+      value: !!settings.resetCompassOnPwr,
+      format: v => v?/*LANG*/"On":/*LANG*/"Off",
+      onchange: v => {
+        settings.resetCompassOnPwr = v;
+        writeSettings();
+      }
+    },
+    /*LANG*/'Show Widget': {
+      value: settings.showWidget,
+      min: 0, max: 2,
+      format: v => ["Never", "Active", "GPS on"][v],
+      onchange: v => {
+        settings.showWidget = v;
+        writeSettings();
+      }
+    },
+  };
+
+  if (magnavInstalled) {
+      menu[/*LANG*/'Tilt compensation on built-in compass'] = {
+      value: !!settings.tiltCompensation,
+      format: v => v?/*LANG*/"On":/*LANG*/"Off",
+      onchange: v => {
+        settings.tiltCompensation = v;
+        writeSettings();
+      }
+    };
+  }
+
+  // Show the menu
+  E.showMenu(menu);
+})(load);