Add helper script for analyzing usage stats exports

contrib/process-usage-stats-export.js

@@ -0,0 +1,45 @@
+const { resolve } = require('path')
+const { readFileSync } = require('fs')
+
+const data = JSON.parse(readFileSync(resolve(__dirname, 'timelimit-usage-stats-export.json')))
+const events = data.events
+  .map((item) => item.native)
+  .map((event) => {
+    // fix wrong exported instanceIds
+    const binary = Buffer.from(event.binary, 'base64')
+    const instanceId = binary.readUInt32LE(8)
+
+    return {...event, instanceId}
+  })
+
+const instanceIdToApp = new Map()
+
+for (event of events) {
+  function printStatus(message) {
+    let apps = []
+
+    for(const app of instanceIdToApp.values()) {
+      apps.push(app)
+    }
+
+    console.log(new Date(event.timestamp) + ': ' + message + ' -> ' + (apps.join(', ') || 'none'))
+  }
+
+  if (event.type === 27 /* reboot */) {
+    instanceIdToApp.clear()
+
+    printStatus('reboot')
+  } else if (event.type === 1 /* move to foreground */) {
+    instanceIdToApp.set(event.instanceId, event.packageName + ':' + event.className)
+
+    printStatus('start ' + event.instanceId)
+  } else if (event.type === 2 /* move to background */) {
+    instanceIdToApp.delete(event.instanceId)
+
+    printStatus('stop ' + event.instanceId)
+  } else if (event.type === 23 /* stopped */) {
+    instanceIdToApp.delete(event.instanceId)
+
+    printStatus('kill ' + event.instanceId)
+  }
+}