.gitignore

node_modules

app.coffee

express = require 'express'
request = require 'superagent'

defaultPort = 3000
comic_path = (id) -> "http://www.smbc-comics.com/?db=comics&id=#{id}"

port = process.env['PORT'] or defaultPort
host = if port isnt defaultPort then '0.0.0.0' else '127.0.0.1'

app = express.createServer()
app.set 'views', '.'
app.set 'view options', layout: false

log = (msg) ->
  console.log "[#{(new Date).toISOString()}] #{msg}" 

app.get '/', (req, res) ->
  res.render 'index.jade'
  
app.get '/comic', (req, res) ->
  id = req.query?.comic_id or 1
  res.redirect "/comic/#{id}"

app.get '/comic/:id', (req, res) ->
  id = req.params.id | 0
  log "Rendering /#{id}"
  log "Requesting #{comic_path(id)}"

  request
    .get(comic_path(id))
    .end (get_resp) ->
      comic = /comics\/([0-9-]*)\.gif/.exec(get_resp.text)
      if comic?
        log "Showing comic ID #{comic[1]}"
        res.render 'comic.jade', 
          comic_id: comic[1],
          id: id,
          next_id: id + 1,
          prev_id: id - 1
      else 
        res.redirect '/'


  
log "Listening on port #{host}:#{port}"
app.listen port, host

comic.jade

html
  head
    title SMBC
  body
    div
      img(src="http://www.smbc-comics.com/comics/"+comic_id+".gif")

    div
      a(href="/comic/" + prev_id) Prev
      a(href='/') Main
      a(href="/comic/" + next_id) Next

index.jade

html
  head
    title SMBC 
  body
    h1 SMBC
    form(action='/comic', method='get')
      div
        label(for='comic_id') Enter a comic ID:
        input(id='comic_id', type='text', value='', name='comic_id')
      div
        input(type='submit', value= 'Get comic')

package.json

{
  "name":"smbc-test",
  "version":"0.0.1",
  "private":true,
  "scripts": {
    "start": "coffee app.coffee"
  },
  "dependencies": {
    "coffee-script": ">=1.3.3",
    "express":">=2.0.0",
    "jade":">=0.26.3",
    "superagent":">=0.0.1"
  },
  "engines": {
    "node": "~0.6.0"
  }
}

Procfile

web: coffee app.coffee