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# purescript-halogen-template
This is a template for starting a fresh project using the [purescript-halogen](https://github.com/slamdata/purescript-halogen) library for declarative user interfaces.
## Prerequisites
This guide assumes you already have Git and Node.js installed with `npm` somewhere on your path.
In the PureScript ecosystem [Bower](http://bower.io/) is the most commonly used package manager and we'll be relying on it for this project, so if you don't already have it, you can install it like this:
``` shell
npm install --global bower
```
## Getting started
First clone the repo and step into it:
``` shell
git clone https://github.com/slamdata/purescript-halogen-template.git my-halogen-project
cd my-halogen-project
```
If you already have a global installation of the PureScript compiler and [Pulp](https://github.com/bodil/pulp), you can run:
``` shell
npm install --production
```
If you want to install a local copy of the PureScript compiler and Pulp then just run the usual:
``` shell
npm install
```
`npm install` is required for Halogen due to its dependency on `virtual-dom`. A postinstall script should have installed the remaining Bower dependencies.
## Building
The project can now be built with:
``` shell
npm run build
```
This will build the PureScript source code, run Browserify on the output, and produce a bundled JS file with `virtual-dom` and the PureScript-compiled JS as `dist/app.js`.
This is an alias for the Pulp command:
``` shell
pulp browserify --to dist/app.js
```
If you open `dist/index.html` you should now have a basic working Halogen app.
That's pretty much it. Have fun with Halogen!

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{
"private": true,
"name": "purescript-halogen-template",
"ignore": [
"**/.*",
"node_modules",
"bower_components",
"output",
"dist"
],
"dependencies": {
"purescript-console": "^0.1.0",
"purescript-halogen": "^0.5.14"
}
}

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<!doctype html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:foo="http://www.w3.org/2000/svg">
<head>
<title>My Halogen App</title>
<style>
body {
font-family: sans-serif;
max-width: 800px;
margin: auto;
}
</style>
</head>
<body>
<script src="app.js"></script>
</body>
</html>

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{
"private": true,
"scripts": {
"postinstall": "pulp dep install",
"build": "pulp browserify --to dist/app.js"
},
"dependencies": {
"virtual-dom": "^2.1.1"
},
"devDependencies": {
"pulp": "^7.0.0",
"purescript": "^0.7.6"
}
}

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module Main where
import Prelude
import Control.Monad.Aff (runAff)
import Control.Monad.Eff (Eff())
import Control.Monad.Eff.Exception (throwException)
import Halogen
import Halogen.Util (appendToBody, onLoad)
import qualified Halogen.HTML.Indexed as H
import qualified Halogen.HTML.Events.Indexed as E
data Query a = ToggleState a
type State = { on :: Boolean }
initialState :: State
initialState = { on: false }
ui :: forall g. (Functor g) => Component State Query g
ui = component render eval
where
render :: State -> ComponentHTML Query
render state =
H.div_
[ H.h1_
[ H.text "Hello world!" ]
, H.p_
[ H.text "Why not toggle this button:" ]
, H.button
[ E.onClick (E.input_ ToggleState) ]
[ H.text
if not state.on
then "Don't push me"
else "I said don't push me!"
]
]
eval :: Natural Query (ComponentDSL State Query g)
eval (ToggleState next) = do
modify (\state -> { on: not state.on })
pure next
main :: Eff (HalogenEffects ()) Unit
main = runAff throwException (const (pure unit)) $ do
app <- runUI ui initialState
onLoad $ appendToBody app.node