feat: make group array generic

packages/core/utils/grouping.js

@@ -0,0 +1,68 @@
+import "../types";
+import fastsort from "fast-sort";
+import {
+  getWeekGroupFromTimestamp,
+  months,
+  getLastWeekTimestamp,
+  get7DayTimestamp,
+} from "./date";
+
+/**
+ *
+ * @param {GroupOptions} options
+ * @returns sort selectors
+ */
+const getSortSelectors = (options) => [
+  { desc: (t) => t.conflicted },
+  { desc: (t) => t.pinned },
+  { [options.sortDirection]: (item) => item[options.sortBy] },
+];
+
+const TIMESTAMPS = {
+  recent: () => getLastWeekTimestamp(7),
+  lastWeek: () => getLastWeekTimestamp(7) - get7DayTimestamp(), //seven day timestamp value
+};
+
+const KEY_SELECTORS = {
+  abc: (item) => item.title[0].toUpperCase(),
+  month: (item, groupBy) => months[new Date(item[groupBy]).getMonth()],
+  week: (item, groupBy) => getWeekGroupFromTimestamp(item[groupBy]),
+  year: (item, groupBy) => new Date(item[groupBy]).getFullYear().toString(),
+  default: (item, groupBy) =>
+    item[groupBy] >= TIMESTAMPS.recent()
+      ? "Recent"
+      : item[groupBy] >= TIMESTAMPS.lastWeek()
+      ? "Last week"
+      : "Older",
+};
+
+/**
+ * @param {any[]} array
+ * @param {GroupOptions} options
+ * @returns Grouped array
+ */
+export function groupArray(array, options) {
+  const keySelector = KEY_SELECTORS[options.groupId];
+  if (sortSelector) fastsort(array).by(getSortSelectors(options));
+
+  let groups = new Map();
+  array.forEach((item) => {
+    let groupTitle = item.pinned
+      ? "Pinned"
+      : item.conflicted
+      ? "Conflicted"
+      : keySelector(item, options.groupBy);
+
+    let group = groups.get(groupTitle) || [];
+    group.push(item);
+    groups.set(groupTitle, group);
+  });
+
+  let items = [];
+  groups.forEach((groupItems, groupTitle) => {
+    let group = { title: groupTitle, type: "header" };
+    items.push(group);
+    groupItems.forEach((item) => items.push(item));
+  });
+  return items;
+}