use typescript

src/model.ts

@@ -0,0 +1,78 @@
+import { ring } from "./config"
+
+export type ItemAttributes = {
+  name: string
+  ring: ring
+  quadrant: string
+  title: string
+  featured: boolean
+}
+
+export type Item = ItemAttributes & {
+  featured: boolean
+  body: string
+  info: string
+  flag: 'new' | 'changed' | 'default'
+  revisions: Revision[]
+}
+
+export type Revision = ItemAttributes & {
+  body: string
+  fileName: string
+  release: string
+}
+
+export type Quadrant = {
+  [name: string]: Item[]
+}
+
+export type Radar = {
+  items: Item[]
+  releases: string[]
+}
+
+export type Group = {
+  [quadrant: string]: Quadrant
+}
+
+export const featuredOnly = (items: Item[]) => items.filter(item => item.featured);
+
+export const groupByQuadrants = (items: Item[]): Group =>
+  items.reduce(
+    (quadrants, item: Item) => ({
+      ...quadrants,
+      [item.quadrant]: addItemToQuadrant(quadrants[item.quadrant], item),
+    }),
+    {} as {[k: string]: Quadrant},
+  );
+
+export const groupByFirstLetter = (items: Item[]) => {
+  const index = items.reduce(
+    (letterIndex, item) => ({
+      ...letterIndex,
+      [getFirstLetter(item)]: addItemToList(
+        letterIndex[getFirstLetter(item)],
+        item,
+      ),
+    }),
+    {} as {[k: string]: Item[]},
+  );
+
+  return Object.keys(index)
+    .sort()
+    .map(letter => ({
+      letter,
+      items: index[letter],
+    }));
+};
+
+const addItemToQuadrant = (quadrant: Quadrant = {}, item: Item): Quadrant => ({
+  ...quadrant,
+  [item.ring]: addItemToRing(quadrant[item.ring], item),
+});
+
+const addItemToList = (list: Item[] = [], item: Item) => [...list, item];
+
+const addItemToRing = (ring: Item[] = [], item: Item) => [...ring, item];
+
+export const getFirstLetter = (item: Item) => item.title.substr(0, 1).toUpperCase();