feat(talks): Add links to slide urls

src/content.js

@@ -1,4 +1,5 @@
-const talks = require("./talks");
+const schedules = require("./schedules");
+const talks = resolveSlideUrls(require("./talks"), schedules);
 const people = resolveSocialLinks(require("./people"));
 const enums = require("./enums");
 
@@ -44,7 +45,7 @@ module.exports = {
   silverSponsors,
   bronzeSponsors,
   presentations,
-  schedules: require("./schedules"),
+  schedules,
   speakers: associate(speakers, [
     {
       field: "keynotes",
@@ -135,3 +136,49 @@ function resolveSocialLinks(data) {
     social: resolve(o.social, o),
   }));
 }
+
+function resolveSlideUrls(talks, schedules) {
+  const talksArray = Object.values(talks);
+  const sessions = resolveSessions(schedules).filter(s => talksArray.indexOf(s) >= 0);
+
+  return Object.keys(talks).map((slug) => {
+    const talk = talks[slug];
+    const index = sessions.findIndex(t => t === talk);
+
+    return {
+      urls: {
+        slides: resolveSlideUrl(index + 1, slug)
+      },
+      ...talk
+    }
+  });
+}
+
+function resolveSessions(schedules) {
+  return flatten(schedules.map(({ intervals }) => {
+    return flatten(intervals.map(({ sessions }) => sessions));
+  }));
+}
+
+// https://gist.github.com/Integralist/749153aa53fea7168e7e
+function flatten(list) {
+  return list.reduce(
+    (a, b) => a.concat(Array.isArray(b) ? flatten(b) : b), []
+  );
+};
+
+function resolveSlideUrl(index, slug) {
+  return `http://slides.react-finland.fi/2018/${leftFill({ amount: 2, character: 0, input: index })}-${slug}.pdf`
+}
+
+function leftFill({ amount, character, input }) {
+  const realAmount = amount - (input.toString()).length;
+
+  if (realAmount < 1) {
+    return input;
+  }
+
+  const characters = new Array(realAmount).fill(character).join('');
+
+  return characters + input;
+}

src/talks/index.js

@@ -1,2 +1,2 @@
-module.exports = Object.values(require('require-dir')());
+module.exports = require('require-dir')();
 

src/type-defs.js

@@ -31,7 +31,13 @@ module.exports = `
     speakers: [Contact],
     tickets: [Ticket],
     keywords: [String],
-    location: Contact
+    location: Contact,
+    urls: SessionUrls
+  }
+
+  type SessionUrls {
+    slides: String,
+    video: String
   }
 
   type Page {

tests.js

@@ -60,6 +60,20 @@ assert.equal(
   ).title
 );
 
+assert.equal(
+  content.presentations.find(
+    o => o.title === "Declarative state and side effects"
+  ).urls.slides,
+  'http://slides.react-finland.fi/2018/02-christian-alfoni.pdf'
+);
+
+assert.equal(
+  content.keynotes.find(
+    o => o.title === "How React changed everything"
+  ).urls.slides,
+  'http://slides.react-finland.fi/2018/13-ken-wheeler.pdf'
+);
+
 assert.equal(
   content.speakers.find(o => o.name === "Christian Alfoni").presentations[0]
     .title,