add string menu functions

code to handle menu string options from Anton clock settings.js

apps/suw/settings.js

@@ -11,25 +11,37 @@
     require('Storage').writeJSON(FILE, settings);
   }
 
+  // Helper method which uses int-based menu item for set of string values
+  function stringItems(startvalue, writer, values) {
+    return {
+      value: (startvalue === undefined ? 0 : values.indexOf(startvalue)),
+      format: v => values[v],
+      min: 0,
+      max: values.length - 1,
+      wrap: true,
+      step: 1,
+      onchange: v => {
+        writer(values[v]);
+        writeSettings();
+      }
+    };
+  }
+
+  // Helper method which breaks string set settings down to local settings object
+  function stringInSettings(name, values) {
+    return stringItems(settings[name], v => settings[name] = v, values);
+  }
+  
   // Show the menu
   E.showMenu({
     "" : { "title" : "Seaside Watch" },
     "< Back" : () => back(),
-    'Tide type': {
-      value: "high"|settings.nextTideType,  // !! converts undefined to false
-      format: v => v?"high":"low ",
-      onchange: v => {
-        settings.nextTideType = v;
-        print(v);
-        writeSettings();
-      }
-    },
+     "Tide type": stringInSettings("nextTideType", ["high", "low "]),
     'Hour': {
       value: 0|settings.nextTideHour,  // 0| converts undefined to 0
       min: 0, max: 23,
       onchange: v => {
         settings.nextTideHour = v;
-        print(v);
         writeSettings();
       }
     },
@@ -38,7 +50,6 @@
       min: 0, max: 59,
       onchange: v => {
         settings.nextTideMin = v;
-        print(v);
         writeSettings();
       }
     },