#+TITLE: Purescript layer

[[file:img/purescript-logo.png]]

* Table of Contents                                         :TOC_4_gh:noexport:
 - [[#description][Description]]
 - [[#install][Install]]
 - [[#key-bindings][Key bindings]]
   - [[#purescript][Purescript]]
     - [[#imports][Imports]]
     - [[#psc-ide][psc-ide]]
   - [[#repl][REPL]]

* Description

This layer provides basic Purescript editing support for spacemacs
thanks to the following packages:
- [[https://github.com/dysinger/purescript-mode][purescript-mode]]
- [[https://github.com/ardumont/emacs-psci][psci]]
- [[https://github.com/epost/psc-ide-emacs][psc-ide-emacs]]

* Install
To use this configuration layer, add it to your =~/.spacemacs=. You will need to
add =purescript= to the existing =dotspacemacs-configuration-layers= list in this
file.

If you want to get autocompletions and type information you have to install [[https://github.com/kRITZCREEK/psc-ide][psc-ide]].

* Key bindings

** Purescript

*** Imports

| Key Binding | Description                                                   |
|-------------+---------------------------------------------------------------|
| ~SPC m i =~ | Format imports                                                |
| ~SPC m i \~ | Return to where you were editing before navigating to imports |
| ~SPC m i a~ | Align imports                                                 |
| ~SPC m i n~ | Navigate to the imports                                       |

*** psc-ide

| Key Binding | Description                                             |
|-------------+---------------------------------------------------------|
| ~SPC m h t~ | Show type at point                                      |
| ~SPC m m l~ | Load a module with its dependencies into psc-ide-server |
| ~SPC m m s~ | Start psc-ide-server                                    |

** REPL

[[https://github.com/ardumont/emacs-psci][psci]] provides a very basic REPL for purescript. The following key
bindings are available:

| Key Binding | Description                                                                      |
|-------------+----------------------------------------------------------------------------------|
| ~SPC m s b~ | Equivalent of =:m /path/to/current/module/file.purs= - Load <file> for importing |
| ~SPC m s i~ | Launch a psci console buffer                                                     |
| ~SPC m s m~ | Equivalent of =:i your.current.module.name= - Import <module> for use in PSCI    |
| ~SPC m s p~ | Load or reload files defined in the project file .psci                           |