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Use Trello as a CMS to create & manage a website
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README.md

Husky CMS

Use Trello as a CMS to create & manage a website.

Features

  • Use Trello cards to represent the pages, blog posts and projects on your site
  • Pages render the markdown in your card's description
  • Setup a blog, which is a Trello list, then quickly add and author posts
  • Showcase projects, which is a different Trello list, then filter and view them
  • Configurable structure, showing only the pages you want
  • Content caching so you don't get rate limited and page loads are fast
  • Plugin system for dynamically adding your own page types

Table of contents

Setup

Prerequisites

  • Know how to use docker & docker-compose
  • A Trello account and board to author your content
  • Understand JSON

Steps

  1. Get a Trello authentication key & token
  2. Get your TRELLO_APP_KEY from trello.com/app-key
  3. Using your key, get your TRELLO_TOKEN from https://trello.com/1/authorize?expiration=never&scope=read&response_type=token&name=Husky%20CMS&key=__YOUR_KEY_HERE__
  4. Make a Trello board for your site's content
    • Add 4 lists: Draft, Pages, Blog, Projects and get the ids for them
    • You'll need to get the id's of your lists to pass them to Husky
      • Open a card on the list you want to get the id of
      • Add .json onto the end of the url & reload
      • Copy the text and paste it into a JSON formatter
      • Find the value for idList in the parsed json
  5. Create a docker-compose.yml using your auth and the ids of those lists
version: '3'

services:
  redis:
    image: redis:4-alpine
    restart: unless-stopped

  husky-site:
    image: unplatform/husky-cms:latest
    restart: unless-stopped
    ports:
      - 3000:3000
    environment:
      SITE_NAME: FancySite
      REDIS_URL: redis://redis
      TRELLO_APP_KEY: your_trello_app_key
      TRELLO_TOKEN: your_trello_app_key
      PAGE_LIST: list_id_for_pages
      PROJECT_LIST: list_id_for_projects
      BLOG_LIST: list_id_for_blog_posts
  1. Run docker-compose up -d

  2. Visit localhost:3000

  3. Add cards to your board and see how the site changes

Configuring

You can set different combinations of lists. If you just have PROJECT_LIST or BLOG_LIST set, the site will just contain that page. If you have PAGE_LIST set, the site will show multiple pages.

Important – When using PAGE_LIST, Husky uses a card named Home as the root page of your site.

Page options

Blog and project pages have extra environment variables to configure their render.

BLOG_SLUG & PROJECT_SLUG are used to determine the url basis for the page and sub pages.

BLOG_NAME & PROJECT_NAME is used for the navigation name. You can set to empty string, '', to the page from navigation.

BLOG_TITLE, BLOG_SUBTITLE, PROJECT_TITLE & PROJECT_SUBTITLE configure the bulma hero on the root page. Again you can set to an empty string, '', to hide the hero.

Multi page mode

If you want more that one of a blog or project page you can set BLOG_LIST or PROJECT_LIST to a csv of ids instead of just one.

When in multi-page mode, each list id becomes a root-level page with the index added on the end. For example, /projects_1, /projects_2 and /projects_1.

Plugins

Husky uses plugins to add different page types, for examples see server/modules. To add your own plugins, mount them in with a docker volume.

volumes:
  - ./my_plugin.js:/app/plugins/my_plugin.js
  - ./my_template.pug:/app/plugins/templates/my_template.pug

There are two types of plugin, Page plugins & Content plugins.

Page plugins

A page plugin adds a type of page to Husky, optionaly rendered if it's variables are set. It'll appear in the nav along the top, or at the root if just this page's variables are set.

Here's an example page plugin, my_plugin.js

function route(ctx) {
  const message = process.env.MESSAGE
  ctx.renderPug('my_template', 'My Page', { message })
}

module.exports = function(husky, utils) {
  husky.registerPage('my_page', {
    name: 'My Page',
    templates: ['my_template'],
    variables: ['MESSAGE'],
    routes: {
      './': route
    }
  })
}

And its corresponding template, my_template.pug

.hero.is-large.is-primary
  .hero-body
    .container
      h1.title Page says: #{message}

This adds a custom page type, my_page, which shows when the MESSAGE environment variable is set. If only the MESSAGE variable is set, it will be the only and root page, / otherwise it will be at /my_page and appear as My Page.

The pug template is rendered inside the site skeleton, which has the theme loaded along with the nav bar and footer above and below it.

Your plugin should expose a single function via module.exports, which takes a husky instance and utils object as parameters.

If you want to serve static files, you can always mount them into /app/static.

Husky modifies Koa's context:

field type use
ctx.sitemode string If the site is serving a specific page or any
ctx.skipCache bool Whether to skip using the trello cache i.e. ?nocache
ctx.pages card[] The page cards from the list with id PAGE_LIST
ctx.sitetree node[] The sitetree nodes for the active pages
ctx.husky husky The husky reference

It also adds these methods for rendering / errors

ctx.renderPug(template, title, data)
ctx.notFound()

Content plugins

A content plugin lets your customise how a card is rendered into html.

let pageviews = {}

module.exports = function(husky, utils) {
  husky.registerContentType('pageviews', {
    parser: card => {
      if (!pageviews[card.id]) {
        pageviews[card.id] = 0
      }

      return `<p> Page views: ${++pageviews[card.id]}`
    },
    order: 75
  })
}

This registers a plugin which adds the pageviews at the bottom of each page. Here is the available config:

By default each blob is wrapped in a <div class="content-TYPE">, where TYPE is your plugin name.

field type use
parser func The parser function, takes a card and returns html
order number Where to put this content, 0 being earlier, 100 later
noWrapper boolean If you don't want the content to be wrapped in a div

Fetching cards

Husky periodically fetches cards from Trello and puts them into redis at a predefined interval. Internally this uses the husky.fetchCards(listId) method.

Whenever you call this method, husky will remember your listId and periodically fetch new cards.

The default interval is 5000 milliseconds but you can override this by setting the POLL_INTERVAL environment variable. Set it to the number of milliseconds you want to wait between fetches.

let cards = await husky.fetchCards('your_list_id')

Development

# Setup your ENV, using the same environment variables from above
cp .env.example .env

# Startup a development redis database
# -> Runs on port 6379 on localhosts
docker-compose up -d

# Startup the dev server
# > This will watch for changes in /app and rebuild js/sass assets
# > This will NOT watch js for changes in /server, you need to restart it for that
# > This will recompile .pug templates when NODE_ENV=development is set
npm run dev

# Deploy docker images
# > Uses REGISTRY file & package version to tag the image and push to dockerhub
# > More info: https://docs.npmjs.com/cli/version
npm version # major | minor | patch

Environment

The server behaves differently depending on what NODE_ENV is set

development

  • .pug files will be compiled for each request, so you always get the latest version
  • Requests to trello will not be cached
  • .js & .sass assets will be hot-reloaded, meaning they will update in the browser on save

production

  • .pug files will be compiled once at startup
  • Requests to Trello will be cached for 10 minutes
  • .js & .css assets will be optimised and minimised

Ideas & further work

  • Display card's attachments, for example:
    • A carousel of images
    • A preview of a git repo
    • Embedding a youtube video
  • Use linked cards to nest pages and create a page hierarchy
  • Different page templates
  • Commenting / voting using the Trello API
  • Use No-Cache headers rather than ?nocache
  • Use the board's theme to colour the site
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