#+TITLE: Hy layer

#+TAGS: general|layer|multi-paradigm|programming

[[file:img/hy.png]]

* Table of Contents                     :TOC_5_gh:noexport:
- [[#description][Description]]
  - [[#features][Features:]]
- [[#install][Install]]
  - [[#layer][Layer]]
  - [[#auto-completion][Auto-completion]]
- [[#key-bindings][Key bindings]]
  - [[#debug][Debug]]
  - [[#repl][REPL]]
  - [[#tests][Tests]]
  - [[#python-environments][Python environments]]

* Description
This layer adds support for the Hy language based on Python.

** Features:
- syntax-highlighting
- Auto-completion
- Code Navigation
- Python test runners (see [[file:../python/README.org][python layer]])
- Virtual Environment using [[https://github.com/jorgenschaefer/pyvenv][pyvenv]] and [[https://github.com/yyuu/pyenv][pyenv]]
- Org Babel support

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

To install =hy= globally:

#+BEGIN_SRC sh
  pip3 install hy
#+END_SRC

** Auto-completion
[[https://github.com/hylang/hy-mode][hy-mode]] relies on [[https://github.com/ekaschalk/jedhy][jedhy]] for auto-completion.

=jedhy= can be installed with:

#+BEGIN_SRC sh
  pip3 install jedhy
#+END_SRC

* Key bindings
** Debug

| Key binding | Description         |
|-------------+---------------------|
| ~SPC m d d~ | insert pdb          |
| ~SPC m d t~ | insert pdb threaded |

** REPL
Start a Hy inferior REPL process with ~SPC m s i~. If =hy= is
available in system executable search paths, =hy= will be used to
launch the shell. You may change your system executable search path
by activating a virtual environment.

Send code to hy REPL commands:

| Key binding | Description                                                     |
|-------------+-----------------------------------------------------------------|
| ~SPC m s b~ | send buffer to the REPL                                         |
| ~SPC m s B~ | send buffer to the REPL and switch to it                        |
| ~SPC m s c~ | send form containing current point to the REPL                  |
| ~SPC m s C~ | send form containing current point to the REPL and switch to it |
| ~SPC m s i~ | start and/or switch to REPL                                     |
| ~SPC m s r~ | send current region to the REPL                                 |
| ~SPC m s R~ | send current region to the REPL and switch to it                |
| ~SPC m s s~ | start and/or swithc to REPL                                     |

** Tests

| Key binding | Description                                          |
|-------------+------------------------------------------------------|
| ~SPC m t a~ | launch all tests of the project                      |
| ~SPC m t A~ | launch all tests of the project in debug mode        |
| ~SPC m t m~ | launch all tests of the current module               |
| ~SPC m t M~ | launch all tests of the current module in debug mode |

** Python environments

| Key binding   | Description                                     |
|---------------+-------------------------------------------------|
| ~SPC m v a~   | activate a virtual environment in any directory |
| ~SPC m v d~   | deactivate active virtual environment           |
| ~SPC m v s~   | set a pyenv environment with [[https://github.com/pyenv/pyenv][pyenv]]              |
| ~SPC m v u~   | unset a pyenv environment with [[https://github.com/pyenv/pyenv][pyenv]]            |
| ~SPC m v w~   | work on virtual environment in =WORKON_HOME=    |
| ~SPC m v p a~ | activate pipenv in current project              |
| ~SPC m v p d~ | deactivate pipenv in current project            |
| ~SPC m v p i~ | install module into pipenv environment          |
| ~SPC m v p o~ | open pipenv module in buffer                    |
| ~SPC m v p s~ | launch pipenv shell in current project          |
| ~SPC m v p u~ | uninstall module from pipenv environment        |