dev: copy shortcuts, magic login links, improved settings page

constants/common.ts

@@ -107,3 +107,75 @@ export const addSpaceIfCamelCase = (str: string) => {
 export const replaceUnderscoreIfSnakeCase = (str: string) => {
   return str.replace(/_/g, " ");
 };
+
+const fallbackCopyTextToClipboard = (text: string) => {
+  var textArea = document.createElement("textarea");
+  textArea.value = text;
+
+  // Avoid scrolling to bottom
+  textArea.style.top = "0";
+  textArea.style.left = "0";
+  textArea.style.position = "fixed";
+
+  document.body.appendChild(textArea);
+  textArea.focus();
+  textArea.select();
+
+  try {
+    // FIXME: Even though we are using this as a fallback, execCommand is deprecated 👎. We should find a better way to do this.
+    // https://developer.mozilla.org/en-US/docs/Web/API/Document/execCommand
+    var successful = document.execCommand("copy");
+    var msg = successful ? "successful" : "unsuccessful";
+    console.log("Fallback: Copying text command was " + msg);
+  } catch (err) {
+    console.error("Fallback: Oops, unable to copy", err);
+  }
+
+  document.body.removeChild(textArea);
+};
+export const copyTextToClipboard = async (text: string) => {
+  if (!navigator.clipboard) {
+    fallbackCopyTextToClipboard(text);
+    return;
+  }
+  await navigator.clipboard.writeText(text);
+};
+
+const wordsVector = (str: string) => {
+  const words = str.split(" ");
+  const vector: any = {};
+  for (let i = 0; i < words.length; i++) {
+    const word = words[i];
+    if (vector[word]) {
+      vector[word] += 1;
+    } else {
+      vector[word] = 1;
+    }
+  }
+  return vector;
+};
+
+export const cosineSimilarity = (a: string, b: string) => {
+  const vectorA = wordsVector(a.trim());
+  const vectorB = wordsVector(b.trim());
+
+  const vectorAKeys = Object.keys(vectorA);
+  const vectorBKeys = Object.keys(vectorB);
+
+  const union = vectorAKeys.concat(vectorBKeys);
+
+  let dotProduct = 0;
+  let magnitudeA = 0;
+  let magnitudeB = 0;
+
+  for (let i = 0; i < union.length; i++) {
+    const key = union[i];
+    const valueA = vectorA[key] || 0;
+    const valueB = vectorB[key] || 0;
+    dotProduct += valueA * valueB;
+    magnitudeA += valueA * valueA;
+    magnitudeB += valueB * valueB;
+  }
+
+  return dotProduct / Math.sqrt(magnitudeA * magnitudeB);
+};