Add ability to attach files and images to messages

public/scripts/utils.js

@@ -512,6 +512,38 @@ export function trimToStartSentence(input) {
     return input;
 }
 
+/**
+ * Format bytes as human-readable text.
+ *
+ * @param bytes Number of bytes.
+ * @param si True to use metric (SI) units, aka powers of 1000. False to use
+ *           binary (IEC), aka powers of 1024.
+ * @param dp Number of decimal places to display.
+ *
+ * @return Formatted string.
+ */
+export function humanFileSize(bytes, si = false, dp = 1) {
+    const thresh = si ? 1000 : 1024;
+
+    if (Math.abs(bytes) < thresh) {
+        return bytes + ' B';
+    }
+
+    const units = si
+        ? ['kB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB']
+        : ['KiB', 'MiB', 'GiB', 'TiB', 'PiB', 'EiB', 'ZiB', 'YiB'];
+    let u = -1;
+    const r = 10 ** dp;
+
+    do {
+        bytes /= thresh;
+        ++u;
+    } while (Math.round(Math.abs(bytes) * r) / r >= thresh && u < units.length - 1);
+
+
+    return bytes.toFixed(dp) + ' ' + units[u];
+}
+
 /**
  * Counts the number of occurrences of a character in a string.
  * @param {string} string The string to count occurrences in.