1 files changed, 16 insertions, 0 deletions
diff --git a/src/index.js b/src/index.js
index f691930..e811be0 100644
--- a/src/index.js
+++ b/src/index.js
@@ -29,6 +29,22 @@ router.get('/post/:filename', async function (ctx) {
   })
 })
 
+const tags = new Map()
+for (let [, post] of posts) {
+  if (post.data.has('tags')) {
+    for (let tag of post.data.get('tags')) {
+      tags.set(tag, (tags.get(tag) || []).concat([post]))
+    }
+  }
+}
+router.get('/tags/:tag', async function (ctx) {
+  ctx.assert(tags.has(ctx.params.tag), 404, 'Tag not found')
+  await ctx.render('tag', {
+    tag: ctx.params.tag,
+    posts: tags.get(ctx.params.tag)
+  })
+})
+
 app.use(router.routes()).use(router.allowedMethods())
 
 module.exports = app