change code structure

src/lib/utils/fileIo.js

@@ -0,0 +1,71 @@
+export default {
+  exportToFile (str, fileName, type = 'octet/stream') {
+    // Create downloader
+    const downloader = document.createElement('a')
+    const blob = new Blob([str], { type })
+    const url = URL.createObjectURL(blob)
+    downloader.href = url
+    downloader.download = fileName
+
+    // Trigger click
+    downloader.click()
+
+    // Clean up
+    URL.revokeObjectURL(url)
+  },
+
+  /**
+   * Note: if user press Cancel in file choosing dialog
+   * it will be an unsettled promise. But it's grabbed by
+   * the garbage collector (tested with FinalizationRegistry).
+   */
+  getFileFromUser (type) {
+    return new Promise(resolve => {
+      const uploader = document.createElement('input')
+
+      uploader.type = 'file'
+      uploader.accept = type
+
+      uploader.addEventListener('change', () => {
+        const file = uploader.files[0]
+        resolve(file)
+      })
+
+      uploader.click()
+    })
+  },
+
+  importFile () {
+    const reader = new FileReader()
+
+    return this.getFileFromUser('.json')
+      .then(file => {
+        return new Promise((resolve, reject) => {
+          reader.onload = e => {
+            resolve(e.target.result)
+          }
+          reader.readAsText(file)
+        })
+      })
+  },
+
+  readFile (path) {
+    return fetch(path)
+  },
+
+  readAsArrayBuffer (file) {
+    const fileReader = new FileReader()
+
+    return new Promise((resolve, reject) => {
+      fileReader.onerror = () => {
+        fileReader.abort()
+        reject(new Error('Problem parsing input file.'))
+      }
+
+      fileReader.onload = () => {
+        resolve(fileReader.result)
+      }
+      fileReader.readAsArrayBuffer(file)
+    })
+  }
+}

src/lib/utils/time.js

@@ -0,0 +1,36 @@
+export default {
+  getPeriod (start, end) {
+    let diff = end.getTime() - start.getTime()
+    let result = ''
+
+    const days = Math.floor(diff / (1000 * 60 * 60 * 24))
+    diff -= days * (1000 * 60 * 60 * 24)
+    if (days) {
+      result += days + ' d '
+    }
+
+    const hours = Math.floor(diff / (1000 * 60 * 60))
+    diff -= hours * (1000 * 60 * 60)
+    if (hours) {
+      result += hours + ' h '
+    }
+
+    const mins = Math.floor(diff / (1000 * 60))
+    diff -= mins * (1000 * 60)
+    if (mins) {
+      result += mins + ' m '
+    }
+
+    const seconds = Math.floor(diff / (1000))
+    diff -= seconds * (1000)
+    if (seconds) {
+      result += seconds + ' s '
+    }
+
+    if (diff) {
+      result += diff + ' ms '
+    }
+
+    return result.replace(/\s$/, '')
+  }
+}