widbaroalarm: keep interval

Do not immediately measure on start

apps/widbaroalarm/ChangeLog

@@ -9,3 +9,5 @@
 0.06: Fix exception
 0.07: Ensure barometer gets turned off after a few readings (isBarometerOn broken in 2v16)
 0.08: Compatibility with hideable Widgets
+0.09: Do not immediately measure on start, keep interval
+      Add plot history to settings

apps/widbaroalarm/metadata.json

@@ -2,7 +2,7 @@
   "id": "widbaroalarm",
   "name": "Barometer Alarm Widget",
   "shortName": "Barometer Alarm",
-  "version": "0.08",
+  "version": "0.09",
   "description": "A widget that can alarm on when the pressure reaches defined thresholds.",
   "icon": "widget.png",
   "type": "widget",

apps/widbaroalarm/settings.js

@@ -107,7 +107,7 @@
         return x + " min";
       }
     },
-    'Log graph': () => {E.showMenu(); draw();},
+    'Plot history': () => {E.showMenu(); draw();},
     };
     E.showMenu(menu);
   }

apps/widbaroalarm/widget.js

@@ -293,8 +293,18 @@ WIDGETS["baroalarm"] = {
   draw : draw
 };
 
-if (interval > 0) {
-  setInterval(getPressureValue, interval * 60000);
+// delay pressure measurement by interval-lastrun
+const lastRun = history3.length > 0 ? history3[history3.length-1].ts : 0;
+const lastRunAgo = Math.round(Date.now() / 1000) - lastRun;
+let diffNextRun = interval*60-lastRunAgo;
+if (diffNextRun < 0) {
+  diffNextRun = 0; // run asap
 }
-getPressureValue();
+setTimeout(() => {
+  if (interval > 0) {
+    setInterval(getPressureValue, interval * 60000);
+  }
+  getPressureValue();
+}, diffNextRun*1000);
+
 })();