colors for cards

src/utils/dom.ts

@@ -170,3 +170,48 @@ export function plural(n: number, one: string, two: string, five: string) {
     return `${n} ${five}`;
   }
 }
+
+export const stringToColour = (str: string) => {
+  let hash = 0;
+
+  for (let i = 0; i < str.length; i++) {
+    hash = str.charCodeAt(i) + ((hash << 5) - hash);
+  }
+
+  let colour = '#';
+
+  for (let i = 0; i < 3; i++) {
+    let value = (hash >> (i * 8)) & 0xff;
+    colour += ('00' + value.toString(16)).substr(-2);
+  }
+
+  return colour;
+};
+
+export const darken = (col: string, amt: number) => {
+  var usePound = false;
+
+  if (col[0] == '#') {
+    col = col.slice(1);
+    usePound = true;
+  }
+
+  var num = parseInt(col, 16);
+
+  var r = (num >> 16) + amt;
+
+  if (r > 255) r = 255;
+  else if (r < 0) r = 0;
+
+  var b = ((num >> 8) & 0x00ff) + amt;
+
+  if (b > 255) b = 255;
+  else if (b < 0) b = 0;
+
+  var g = (num & 0x0000ff) + amt;
+
+  if (g > 255) g = 255;
+  else if (g < 0) g = 0;
+
+  return (usePound ? '#' : '') + (g | (b << 8) | (r << 16)).toString(16);
+};