249 lines
10 KiB
Org Mode
249 lines
10 KiB
Org Mode
#+TITLE: Scala layer
|
|
|
|
[[file:img/scala.png]] with [[file:img/ensime.png]]
|
|
|
|
* Table of Contents :TOC_4_gh:noexport:
|
|
- [[#description][Description]]
|
|
- [[#layer-installation][Layer Installation]]
|
|
- [[#ensime][Ensime]]
|
|
- [[#installation][Installation]]
|
|
- [[#usage][Usage]]
|
|
- [[#scalastyle][Scalastyle]]
|
|
- [[#use-java-doc-style][Use Java doc-style]]
|
|
- [[#automatically-show-the-type-of-the-symbol-under-the-cursor][Automatically show the type of the symbol under the cursor]]
|
|
- [[#automatically-insert-asterisk-in-multiline-comments][Automatically insert asterisk in multiline comments]]
|
|
- [[#automatically-replace-arrows-with-unicode-ones][Automatically replace arrows with unicode ones]]
|
|
- [[#disable-auto-start][Disable auto-start]]
|
|
- [[#key-bindings][Key bindings]]
|
|
- [[#ensime-key-bindings][Ensime key bindings]]
|
|
- [[#search][Search]]
|
|
- [[#sbt][sbt]]
|
|
- [[#typecheck][Typecheck]]
|
|
- [[#debug][Debug]]
|
|
- [[#errors][Errors]]
|
|
- [[#goto][Goto]]
|
|
- [[#print-and-yank-types][Print and yank types]]
|
|
- [[#documentation-inspect][Documentation, Inspect]]
|
|
- [[#server][Server]]
|
|
- [[#refactoring][Refactoring]]
|
|
- [[#tests][Tests]]
|
|
- [[#repl][REPL]]
|
|
|
|
* Description
|
|
This layer adds support for the Scala language using the excellent [[https://github.com/ensime][ENSIME]]
|
|
client/server.
|
|
|
|
* Layer Installation
|
|
To use this configuration layer, add it to your =~/.spacemacs=. You will need to
|
|
add =scala= to the existing =dotspacemacs-configuration-layers= list in this
|
|
file.
|
|
|
|
* Ensime
|
|
[[https://github.com/ensime][ENSIME]] provides IDE-like features, such as refactoring, incremental
|
|
compilation and project-wide type-checking.
|
|
|
|
ENSIME requires a configuration file at the root of each Scala project. It
|
|
provides an SBT plugin to generate these files.
|
|
|
|
** Installation
|
|
Refer to the [[https://ensime.github.io/build_tools/sbt/][Ensime installation instructions]] to install the =ensime-sbt= plugin.
|
|
|
|
Please note you have to use a version newer that =0.13.5= of =sbt= in your project's
|
|
=project/build.properties=. For example,
|
|
|
|
#+BEGIN_SRC scala
|
|
sbt.version=0.13.11
|
|
#+END_SRC
|
|
|
|
** Usage
|
|
1. Create a =.ensime= file at the root of your Scala project using =sbt
|
|
ensimeConfig= and =sbt ensimeConfigProject= at the shell.
|
|
2. Run =M-x ensime= within Emacs to start an ENSIME session.
|
|
|
|
Each Scala project uses a dedicated ENSIME session, so you only need to run =M-x
|
|
ensime= once per project. Any Scala files you create or visit within the project
|
|
will automatically use ENSIME for the remainder of your editing session.
|
|
|
|
* Scalastyle
|
|
[[http://flycheck.readthedocs.org/en/latest/guide/languages.html#el.flycheck-checker.scala-scalastyle][Scalastyle]] provides style-checking and linting. The Emacs functionality is
|
|
provided by Flycheck.
|
|
|
|
To use scalastyle,
|
|
|
|
1. Download the [[https://oss.sonatype.org/content/repositories/releases/org/scalastyle/scalastyle_2.11/0.6.0/][scalastyle jar]] and put it somewhere sensible
|
|
2. Customise the =flycheck-scalastyle-jar= variable and set it to the path of
|
|
the jar.
|
|
|
|
See the [[http://flycheck.readthedocs.org/en/latest/guide/languages.html#el.flycheck-checker.scala-scalastyle][flycheck documentation]] for up-to-date configuration instructions.
|
|
|
|
** Use Java doc-style
|
|
To enable =java-doc-style=, set the variable =scala-indent:use-javadoc-style= to =t=
|
|
|
|
#+BEGIN_SRC emacs-lisp
|
|
(setq-default dotspacemacs-configuration-layers '(
|
|
(scala :variables scala-indent:use-javadoc-style t)))
|
|
#+END_SRC
|
|
|
|
* Automatically show the type of the symbol under the cursor
|
|
To enable the feature =ensime-print-type-at-point= when cursor moves, set the
|
|
variable =scala-enable-eldoc= to =t=.
|
|
|
|
#+BEGIN_SRC emacs-lisp
|
|
(setq-default dotspacemacs-configuration-layers '(
|
|
(scala :variables scala-use-java-doc-style t)))
|
|
#+END_SRC
|
|
|
|
Enabling this option can cause slow editor performance.
|
|
|
|
* Automatically insert asterisk in multiline comments
|
|
To insert a leading asterisk in multiline comments automatically, set the variable =scala-auto-insert-asterisk-in-comments= to =t=.
|
|
|
|
#+BEGIN_SRC emacs-lisp
|
|
(setq-default dotspacemacs-configuration-layers '(
|
|
(scala :variables scala-auto-insert-asterisk-in-comments t)))
|
|
#+END_SRC
|
|
|
|
* Automatically replace arrows with unicode ones
|
|
To replace ~=>~, =->= and =<-= with unicode arrows =⇒=, =→= and =←=, set the
|
|
variable =scala-use-unicode-arrows= to =t=.
|
|
|
|
If in some occasions you don't want the arrows replaced (for example when
|
|
defining compound operators like ~=>>~), you can always undo the change and get
|
|
the ascii arrows back.
|
|
|
|
#+BEGIN_SRC emacs-lisp
|
|
(setq-default dotspacemacs-configuration-layers '(
|
|
(scala :variables scala-use-unicode-arrows t)))
|
|
#+END_SRC
|
|
|
|
* Disable auto-start
|
|
If you prefer not to have Ensime start when you load a scala file, you can
|
|
disable it with
|
|
|
|
#+BEGIN_SRC emacs-lisp
|
|
(setq-default dotspacemacs-configuration-layers '(
|
|
(scala :variables scala-auto-start-ensime nil)))
|
|
#+END_SRC
|
|
|
|
* Key bindings
|
|
** Ensime key bindings
|
|
*** Search
|
|
|
|
| Key Binding | Description |
|
|
|-------------+-----------------------------------------------------|
|
|
| ~SPC m /~ | incremental search using =ensime-scalex= major mode |
|
|
| ~SPC m ?~ | incremental search in all live buffers |
|
|
|
|
*** sbt
|
|
|
|
| Key Binding | Description |
|
|
|-------------+---------------------|
|
|
| ~SPC m b c~ | compile command |
|
|
| ~SPC m b C~ | clean command |
|
|
| ~SPC m b i~ | switch to sbt shell |
|
|
| ~SPC m b p~ | package command |
|
|
| ~SPC m b r~ | run command |
|
|
|
|
*** Typecheck
|
|
|
|
| Key Binding | Description |
|
|
|-------------+---------------------------------|
|
|
| ~SPC m c t~ | type check the current file |
|
|
| ~SPC m c T~ | type check all the open buffers |
|
|
|
|
*** Debug
|
|
|
|
| Key Binding | Description |
|
|
|-------------+-----------------------------|
|
|
| ~SPC m d A~ | Attach to a remote debugger |
|
|
| ~SPC m d b~ | set breakpoint |
|
|
| ~SPC m d B~ | clear breakpoint |
|
|
| ~SPC m d C~ | clear all breakpoints |
|
|
| ~SPC m d c~ | continue |
|
|
| ~SPC m d d~ | start a debug session |
|
|
| ~SPC m d i~ | inspect value at point |
|
|
| ~SPC m d l~ | list local variables |
|
|
| ~SPC m d n~ | next |
|
|
| ~SPC m d o~ | step out |
|
|
| ~SPC m d q~ | quit |
|
|
| ~SPC m d r~ | run |
|
|
| ~SPC m d s~ | step |
|
|
| ~SPC m d t~ | backtrace |
|
|
*Note:* These key bindings need a transient-state, PR welcome :-)
|
|
|
|
*** Errors
|
|
|
|
| Key Binding | Description |
|
|
|-------------+----------------------------------------------------|
|
|
| ~SPC m e e~ | print error at point |
|
|
| ~SPC m e l~ | show all errors and warnings |
|
|
| ~SPC m e s~ | switch to buffer containing the stack trace parser |
|
|
|
|
*** Goto
|
|
|
|
| Key Binding | Description |
|
|
|-------------+----------------------|
|
|
| ~SPC m g g~ | go to definition |
|
|
| ~SPC m g i~ | go to implementation |
|
|
| ~SPC m g t~ | go to test |
|
|
|
|
*** Print and yank types
|
|
|-------------+--------------------------------|
|
|
| ~SPC m h T~ | print full type name at point |
|
|
| ~SPC m h t~ | print short type name at point |
|
|
| ~SPC m y T~ | yank full type name at point |
|
|
| ~SPC m y t~ | yank short type name at point |
|
|
|
|
*** Documentation, Inspect
|
|
|
|
| Key Binding | Description |
|
|
|-------------+----------------------------------------|
|
|
| ~SPC m h h~ | show documentation for symbol at point |
|
|
| ~SPC m h u~ | show uses for symbol at point |
|
|
| ~SPC m i i~ | inspect type at point |
|
|
| ~SPC m i I~ | inspect type in other frame |
|
|
| ~SPC m i p~ | inspect project package |
|
|
|
|
*** Server
|
|
|
|
| Key Binding | Description |
|
|
|-------------+--------------------------------------------------------|
|
|
| ~SPC m n F~ | reload open files |
|
|
| ~SPC m n s~ | start ensime server |
|
|
| ~SPC m n S~ | regenerate the =.ensime= and restart the ensime server |
|
|
|
|
*** Refactoring
|
|
|
|
| Key Binding | Description |
|
|
|-------------+----------------------------------------------------------------------|
|
|
| ~SPC m r a~ | add type annotation |
|
|
| ~SPC m r f~ | format source |
|
|
| ~SPC m r d~ | get rid of an intermediate variable (=ensime-refactor-inline-local=) |
|
|
| ~SPC m r D~ | get rid of an intermediate variable (=ensime-undo-peek=) |
|
|
| ~SPC m r i~ | organize imports |
|
|
| ~SPC m r m~ | extract a range of code into a method |
|
|
| ~SPC m r r~ | rename a symbol project wide |
|
|
| ~SPC m r t~ | import type at point |
|
|
| ~SPC m r v~ | extract a range of code into a variable |
|
|
| ~SPC m z~ | expand/contract region |
|
|
|
|
*** Tests
|
|
|
|
| Key Binding | Description |
|
|
|-------------+--------------------------|
|
|
| ~SPC m t a~ | test command (sbt) |
|
|
| ~SPC m t r~ | test quick command (sbt) |
|
|
| ~SPC m t t~ | test only (sbt) |
|
|
|
|
*** REPL
|
|
|
|
| Key Binding | Description |
|
|
|-------------+---------------------------------------------------------------------|
|
|
| ~SPC m s a~ | ask for a file to be loaded in the REPL |
|
|
| ~SPC m s b~ | send buffer to the REPL |
|
|
| ~SPC m s B~ | send buffer to the REPL and focus the REPL buffer in =insert state= |
|
|
| ~SPC m s i~ | start or switch to the REPL inferior process |
|
|
| ~SPC m s r~ | send region to the REPL |
|
|
| ~SPC m s R~ | send region to the REPL and focus the REPL buffer in =insert state= |
|