build a dynamic webapp in Yesod in just three days
This screenscast shows what I built. Scroll down for my Yesod braindump.
I've been astonished how quickly this went together. This is my first time using any sort of web framework, and I used a still unusual one, Yesod. It's my first time using Bootstrap too. It's also the first time I've done any AJAX programming!
Bootstrap was something I'd heard of and seen some suspiciously similar looking sites built with, but it was really a pleasant surprise. Being able to make things that work and look good on the web without struggling with CSS is such a nice change. For the first time, it makes the web feel like a UI toolkit to me.
Overall, I'm really enjoying Yesod, and it's making me productive in new ways.
I also see a lot of potential in Yesod to improve from where it is.
I'm betting this will be integrated into Yesod eventually. They have an active wiki page about it.
There's a WAI library for building local webapps with Yesod, but it was not suitable for my needs (for one thing, it lacks security; for another it kills the haskell program when the web page is closed); so I built my own webapp library. A problem with my current pace of development is that I'm building lots of reusable libraries, but I don't have the time to stabalize them and make them generally available. That one goes in the pile of 2k+ lines of such code.
Yesod needs a version of the Hamlet markup that can be edited by people who only understand html. That means it should allow closing tags, and tabs, and not have nasty whitespace gotchas. I think this would be easy to build, starting from Hamlet. It could be called "Hecate".. I don't have time right now.
The compile time error messages are often beyond atrocious. Seriously, I'm tempted to write a filter to filter out common patterns where there's one line about a syntax error in a Hamlet file sandwitched in between 150 lines of type error gobbly-gook and generated code.
Some really nice things could be done integrating Yesod with Bootstrap. Like the ability to build entire sites by just composing together Bootstrap components, with no need to write a single line of html or css. I'm very tempted to try to build this library.
webpage = bootstrap Dynamic $ do setTitle "FooCorp" login <- getLogin navbar [FixedTop] $ do brand "FooCorp" link AboutR link BlogR nav [PullRight] $ link . maybe LoginR ProfileR login div [ContainerFluid] $ content login where content Nothing = heroUnit $ do para $ "We're the FooCorp for you." button "Register Today" [Primary, Large] SignUpR carousel [ amazingFeatures , aboutFooCorp , pricing ] content (Just user) = do para $ "Welcome back " ++ name user ++ "!" showProfile user