From 4653ffc07b876a75e6f2fe4f9de64a0423a9afc3 Mon Sep 17 00:00:00 2001
From: David Peer <david.peer@outlook.com>
Date: Thu, 8 Sep 2022 16:00:46 +0200
Subject: [PATCH] Show calendar week

---
 apps/bwclk/ChangeLog     |  3 ++-
 apps/bwclk/app.js        | 16 +++++++++++++++-
 apps/bwclk/metadata.json |  2 +-
 3 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/apps/bwclk/ChangeLog b/apps/bwclk/ChangeLog
index 81aab5050..59bf9eb96 100644
--- a/apps/bwclk/ChangeLog
+++ b/apps/bwclk/ChangeLog
@@ -17,4 +17,5 @@
 0.17: Fix - Step count was no more shown in the menu.
 0.18: Set timer for an agenda entry by simply clicking in the middle of the screen. Only one timer can be set.
 0.19: Fix - Compatibility with "Digital clock widget"
-0.20: Better handling of async data such as getPressure.
\ No newline at end of file
+0.20: Better handling of async data such as getPressure.
+0.21: On the default menu the week of year can be shown.
\ No newline at end of file
diff --git a/apps/bwclk/app.js b/apps/bwclk/app.js
index 0a955cf7f..cd1979e98 100644
--- a/apps/bwclk/app.js
+++ b/apps/bwclk/app.js
@@ -198,6 +198,7 @@ function imgMountain() {
 var menu = [
   [
     function(){ return [ null, null ] },
+    function(){ return [ "Week " + weekOfYear(), null ] },
   ],
   [
     function(){ return [ "Bangle", imgWatch() ] },
@@ -423,6 +424,19 @@ function getWeather(){
   };
 }
 
+// From https://weeknumber.com/how-to/javascript
+function weekOfYear() {
+    var date = new Date();
+    date.setHours(0, 0, 0, 0);
+    // Thursday in current week decides the year.
+    date.setDate(date.getDate() + 3 - (date.getDay() + 6) % 7);
+    // January 4 is always in week 1.
+    var week1 = new Date(date.getFullYear(), 0, 4);
+    // Adjust to Thursday in week 1 and count number of weeks from date to week1.
+    return 1 + Math.round(((date.getTime() - week1.getTime()) / 86400000
+                          - 3 + (week1.getDay() + 6) % 7) / 7);
+}
+
 
 function isAlarmEnabled(idx){
   try{
@@ -600,7 +614,7 @@ function drawTime(){
     }
 
     var imgWidth = 0;
-    if(menuImg !== undefined){
+    if(menuImg){
       imgWidth = 24.0;
       var strWidth = g.stringWidth(menuText);
       var scale = imgWidth / menuImg.width;
diff --git a/apps/bwclk/metadata.json b/apps/bwclk/metadata.json
index 919ecad13..b6896ab5e 100644
--- a/apps/bwclk/metadata.json
+++ b/apps/bwclk/metadata.json
@@ -1,7 +1,7 @@
 {
   "id": "bwclk",
   "name": "BW Clock",
-  "version": "0.20",
+  "version": "0.21",
   "description": "A very minimalistic clock to mainly show date and time.",
   "readme": "README.md",
   "icon": "app.png",