#+TITLE: Clojure contribution layer for Spacemacs

[[file:img/clojure.png]] [[file:img/cider.png]]

* Table of Contents                                                  :TOC@4:
 - [[#description][Description]]
 - [[#features][Features]]
 - [[#install][Install]]
   - [[#layer][Layer]]
   - [[#pretty-symbols][Pretty Symbols]]
   - [[#cider-and-clj-refactor][CIDER and clj-refactor]]
     - [[#quick-start-with-lein][Quick Start with lein]]
     - [[#more-details][More details]]
 - [[#key-bindings][Key Bindings]]
   - [[#leader][Leader]]
     - [[#documentation][Documentation]]
     - [[#evaluation][Evaluation]]
     - [[#goto][Goto]]
     - [[#repl][REPL]]
     - [[#tests][Tests]]
     - [[#toggles][Toggles]]
     - [[#debugging][Debugging]]
     - [[#refactoring][Refactoring]]
     - [[#reformatting][Reformatting]]
   - [[#cider-buffers][CIDER Buffers]]
     - [[#stacktrace-mode][stacktrace-mode]]
     - [[#inspector-mode][inspector-mode]]
     - [[#test-report-mode][test-report-mode]]

* Description

This layer adds support for [[http://clojure.org][Clojure]] language using [[https://github.com/clojure-emacs/cider][CIDER]].

* Features

- REPL via [[https://github.com/clojure-emacs/cider][CIDER]]
- Refactoring via [[https://github.com/clojure-emacs/clj-refactor.el][clj-refactor]]
- Automatic formatting via [[https://github.com/gstamp/align-cljlet][align-cljlet]]
  
* Install

** Layer

To use this contribution add it to your =~/.spacemacs=

#+BEGIN_SRC emacs-lisp
  (setq-default dotspacemacs-configuration-layers '(clojure))
#+END_SRC

** Pretty Symbols

Pretty symbols for anonymous functions, set literals and partial, like =(λ [a]
(+ a 5))=, =ƒ(+ % 5)=, =∈{2 4 6}= and =Ƥ=.

To enable this feature, add the following snippet to the
=dotspacemacs/user-config= section of your =~/.spacemacs= file:

#+BEGIN_SRC emacs-lisp
  (setq clojure-enable-fancify-symbols t)
#+END_SRC

Or set this variable when loading the configuration layer:
#+BEGIN_SRC emacs-lisp
  (setq-default dotspacemacs-configuration-layers
  '((clojure :variables clojure-enable-fancify-symbols t)))
#+END_SRC

** CIDER and clj-refactor

*** Quick Start with lein

- Install =lein= via your OS package manager.
- Create a file =~/.lein/profiles.clj= with the following content:
  
#+BEGIN_SRC clojure
  {:user {:plugins [[cider/cider-nrepl "0.10.0-SNAPSHOT"]
                    [refactor-nrepl "1.2.0-SNAPSHOT"]]
          :dependencies [[alembic "0.3.2"]
                         [org.clojure/tools.nrepl "0.2.10"]]}}
#+END_SRC

- After creating your project with ~lein new app <projectname>~ or
  importing an existing project, run ~SPC m s i~ in any of the clojure
  source files to connect to the Cider REPL.

*** More details

More info regarding installation of nREPL middleware can be found here:
- CIDER: [[https://github.com/clojure-emacs/cider#installation][cider_install]]
- clj-refactor: [[https://github.com/clojure-emacs/refactor-nrepl][refactor-nrepl]]
  
* Key Bindings

** Leader

*** Documentation

| Key Binding | Description    |
|-------------+----------------|
| ~SPC m h g~ | cider grimoire |
| ~SPC m h h~ | cider doc      |
| ~SPC m h j~ | cider javadoc  |

*** Evaluation

| Key Binding | Description                            |
|-------------+----------------------------------------|
| ~SPC m e b~ | eval buffer                            |
| ~SPC m e e~ | eval last sexp                         |
| ~SPC m e f~ | eval function at point                 |
| ~SPC m e r~ | eval region                            |
| ~SPC m e w~ | eval last sexp and replace with result |

*** Goto

| Key Binding | Description   |
|-------------+---------------|
| ~SPC m g b~ | go back       |
| ~SPC m g g~ | goto var      |
| ~SPC m g e~ | goto error    |
| ~SPC m g r~ | goto resource |

*** REPL

| Key Binding | Description                                                  |
|-------------+--------------------------------------------------------------|
| ~SPC m s b~ | send and eval buffer in REPL                                 |
| ~SPC m s B~ | send and eval buffer and switch to REPL in =insert state=    |
| ~SPC m s c~ | connect to REPL (cider-connect)                              |
| ~SPC m s e~ | send and eval last sexp in REPL                              |
| ~SPC m s E~ | send and eval last sexp and switch to REPL in =insert state= |
| ~SPC m s f~ | send and eval function in REPL                               |
| ~SPC m s F~ | send and eval function and switch to REPL in =insert state=  |
| ~SPC m s i~ | start REPL (cider-jack-in)                                   |
| ~SPC m s n~ | send and eval ns form in REPL                                |
| ~SPC m s N~ | send and eval ns form and switch to REPL in =insert state=   |
| ~SPC m s q~ | kill REPL (cider-quit)                                       |
| ~SPC m s r~ | send and eval region in REPL                                 |
| ~SPC m s R~ | send and eval region and switch to REPL in =insert state=    |
| ~SPC m s s~ | switch to REPL                                               |

*** Tests

| Key Binding | Description                        |
|-------------+------------------------------------|
| ~SPC m t a~ | run all tests in namespace         |
| ~SPC m t r~ | re-run test failures for namespace |
| ~SPC m t t~ | run test at point                  |

*** Toggles

| Key Binding | Description                 |
|-------------+-----------------------------|
| ~SPC m T f~   | toggle REPL font-locking    |
| ~SPC m T p~   | toggle REPL pretty-printing |
| ~SPC m T i~   | toggle indentation style    |

*** Debugging

| Key Binding | Description                    |
|-------------+--------------------------------|
| ~SPC m d r~   | reload namepspaces             |
| ~SPC m d b~   | instrument expression at point |
| ~SPC m d e~   | display last stacktrace        |
| ~SPC m d i~   | inspect expression at point    |

*** Refactoring

| Key Binding   | Description                 |
|---------------+-----------------------------|
| ~SPC m r ?~   | describe refactoring        |
| ~SPC m r a d~ | add declaration             |
| ~SPC m r a i~ | add import to ns            |
| ~SPC m r a m~ | add missing libspec         |
| ~SPC m r a p~ | add project dependency      |
| ~SPC m r a r~ | add require to ns           |
| ~SPC m r a u~ | add use to ns               |
| ~SPC m r c c~ | cycle coll                  |
| ~SPC m r c i~ | cycle if                    |
| ~SPC m r c n~ | clean ns                    |
| ~SPC m r c p~ | cycle privacy               |
| ~SPC m r d k~ | destructure keys            |
| ~SPC m r e f~ | extract function            |
| ~SPC m r e c~ | extract constant            |
| ~SPC m r e l~ | expand let                  |
| ~SPC m r f u~ | find usages                 |
| ~SPC m r f e~ | create fn from example      |
| ~SPC m r h d~ | hotload dependency          |
| ~SPC m r i l~ | introduce let               |
| ~SPC m r i s~ | inline symbol               |
| ~SPC m r m f~ | move form                   |
| ~SPC m r m l~ | move to let                 |
| ~SPC m r p c~ | project clean               |
| ~SPC m r p f~ | promote function            |
| ~SPC m r r d~ | remove debug fns            |
| ~SPC m r r f~ | rename file                 |
| ~SPC m r r l~ | remove let                  |
| ~SPC m r r r~ | remove unused requires      |
| ~SPC m r r s~ | rename symbol               |
| ~SPC m r r u~ | replace use                 |
| ~SPC m r s n~ | sort ns                     |
| ~SPC m r s p~ | sort project dependencies   |
| ~SPC m r s r~ | stop referring              |
| ~SPC m r s c~ | show changelog              |
| ~SPC m r t f~ | thread first all            |
| ~SPC m r t h~ | thread                      |
| ~SPC m r t l~ | thread last all             |
| ~SPC m r u a~ | unwind all                  |
| ~SPC m r u p~ | update project dependencies |
| ~SPC m r u w~ | unwind                      |

*** Reformatting

- Forms currently handled:
  - let
  - when-let
  - if-let
  - binding
  - loop
  - with-open
  - literal hashes {}
  - defroute
  - cond
  - condp (except :>> subforms)
  
More info at [[https://github.com/gstamp/align-cljlet][align-cljlet]].

| Key Binding | Description           |
|-------------+-----------------------|
| ~SPC m f l~ | reformat current form |

** CIDER Buffers

In general, ~q~ should always quit the popped up buffer.

*** stacktrace-mode

| Key Binding | Description         |
|-------------+---------------------|
| ~C-j~       | next cause          |
| ~C-k~       | previous cause      |
| ~TAB~       | cycle current cause |
| ~0~         | cycle all causes    |
| ~1~         | cycle cause 1       |
| ~2~         | cycle cause 2       |
| ~3~         | cycle cause 3       |
| ~4~         | cycle cause 4       |
| ~5~         | cycle cause 5       |
| ~a~         | toggle all          |
| ~c~         | toggle clj          |
| ~d~         | toggle duplicates   |
| ~J~         | toggle java         |
| ~r~         | toggle repl         |
| ~T~         | toggle tooling      |

*** inspector-mode

| Key Binding | Description                     |
|-------------+---------------------------------|
| ~TAB~       | next inspectable object         |
| ~Shift-TAB~ | previous inspectable object     |
| ~RET~       | inspect object                  |
| ~L~         | pop to the parent object        |
| ~n~         | next page in paginated view     |
| ~N~         | previous page in paginated view |
| ~r~         | refresh                         |
| ~s~         | set a new page size             |

*** test-report-mode

| Key Binding | Description       |
|-------------+-------------------|
| ~C-j~       | next result       |
| ~C-k~       | previous result   |
| ~RET~       | jump to test      |
| ~d~         | ediff test result |
| ~e~         | show stacktrace   |
| ~r~         | rerun tests       |
| ~t~         | run test          |
| ~T~         | run tests         |