249 lines
9.6 KiB
Org Mode
249 lines
9.6 KiB
Org Mode
#+TITLE: Scala layer
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[[file:img/scala.png]] with [[file:img/ensime.png]]
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* Table of Contents :TOC_4_gh:noexport:
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- [[#description][Description]]
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- [[#layer-installation][Layer Installation]]
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- [[#ensime][Ensime]]
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- [[#installation][Installation]]
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- [[#usage][Usage]]
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- [[#scalastyle][Scalastyle]]
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- [[#automatically-show-the-type-of-the-symbol-under-the-cursor][Automatically show the type of the symbol under the cursor]]
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- [[#automatically-insert-asterisk-in-multiline-comments][Automatically insert asterisk in multiline comments]]
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- [[#automatically-replace-arrows-with-unicode-ones][Automatically replace arrows with unicode ones]]
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- [[#disable-auto-start][Disable auto-start]]
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- [[#key-bindings][Key bindings]]
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- [[#ensime-key-bindings][Ensime key bindings]]
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- [[#search][Search]]
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- [[#sbt][sbt]]
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- [[#typecheck][Typecheck]]
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- [[#debug][Debug]]
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- [[#errors][Errors]]
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- [[#goto][Goto]]
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- [[#documentation-inspect][Documentation, Inspect]]
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- [[#server][Server]]
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- [[#refactoring][Refactoring]]
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- [[#tests][Tests]]
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- [[#repl][REPL]]
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* Description
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This layer adds support for the Scala language using the excellent [[https://github.com/ensime][ENSIME]]
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client/server.
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* Layer Installation
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To use this configuration layer, add it to your =~/.spacemacs=. You will need to
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add =scala= to the existing =dotspacemacs-configuration-layers= list in this
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file.
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* Ensime
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[[https://github.com/ensime][ENSIME]] provides IDE-like features, such as refactoring, incremental
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compilation and project-wide type-checking.
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ENSIME requires a configuration file at the root of each Scala project. It
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provides an SBT plugin to generate these files.
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** Installation
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Configure the ENSIME sbt plugin by adding the following to
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=~/.sbt/0.13/plugins/plugins.sbt=:
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#+BEGIN_SRC scala
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addSbtPlugin("org.ensime" % "ensime-sbt" % "0.2.3")
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#+END_SRC
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Please go to [[https://github.com/ensime/ensime-sbt][ensime-sbt Github Page]] to check the latest version of =ensime-sbt= plugin.
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Please note your projects' =project/build.properties= need to use a version newer that =0.13.5= of sbt.
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#+BEGIN_SRC scala
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sbt.version=0.13.9
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#+END_SRC
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** Usage
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1. Create a =.ensime= file at the root of your Scala project using =sbt
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gen-ensime= at the shell.
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2. Run =M-x ensime= within Emacs to start an ENSIME session.
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Each Scala project uses a dedicated ENSIME session, so you only need to run =M-x
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ensime= once per project. Any Scala files you create or visit within the project
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will automatically use ENSIME for the remainder of your editing session.
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* Scalastyle
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[[http://flycheck.readthedocs.org/en/latest/guide/languages.html#el.flycheck-checker.scala-scalastyle][Scalastyle]] provides style-checking and linting. The Emacs functionality is
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provided by Flycheck.
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To use scalastyle,
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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
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2. Customise the =flycheck-scalastyle-jar= variable and set it to the path of
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the jar.
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See the [[http://flycheck.readthedocs.org/en/latest/guide/languages.html#el.flycheck-checker.scala-scalastyle][flycheck documentation]] for up-to-date configuration instructions.
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* Automatically show the type of the symbol under the cursor
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To enable the feature =ensime-print-type-at-point= when cursor moves, set the
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variable =scala-enable-eldoc= to =t=.
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#+BEGIN_SRC emacs-lisp
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(setq-default dotspacemacs-configuration-layers '(
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(scala :variables scala-enable-eldoc t)))
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#+END_SRC
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Enabling this option can cause slow editor performance.
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* Automatically insert asterisk in multiline comments
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To insert a leading asterisk in multiline comments automatically, set the variable =scala-auto-insert-asterisk-in-comments= to =t=.
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#+BEGIN_SRC emacs-lisp
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(setq-default dotspacemacs-configuration-layers '(
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(scala :variables scala-auto-insert-asterisk-in-comments t)))
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#+END_SRC
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* Automatically replace arrows with unicode ones
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To replace ~=>~, =->= and =<-= with unicode arrows =⇒=, =→= and =←=, set the
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variable =scala-use-unicode-arrows= to =t=.
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If in some occasions you don't want the arrows replaced (for example when
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defining compound operators like ~=>>~), you can always undo the change and get
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the ascii arrows back.
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#+BEGIN_SRC emacs-lisp
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(setq-default dotspacemacs-configuration-layers '(
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(scala :variables scala-use-unicode-arrows t)))
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* Disable auto-start
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If you prefer not to have Ensime start when you load a scala file, you can
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disable it with
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#+BEGIN_SRC emacs-lisp
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(setq-default dotspacemacs-configuration-layers '(
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(scala :variables scala-auto-start-ensime nil)))
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#+END_SRC
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* Key bindings
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** Ensime key bindings
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*** Search
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| Key Binding | Description |
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|-------------+-----------------------------------------------------|
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| ~SPC m /~ | incremental search using =ensime-scalex= major mode |
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| ~SPC m ?~ | incremental search in all live buffers |
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*** sbt
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| Key Binding | Description |
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|-------------+---------------------|
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| ~SPC m b c~ | compile command |
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| ~SPC m b C~ | clean command |
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| ~SPC m b i~ | switch to sbt shell |
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| ~SPC m b p~ | package command |
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| ~SPC m b r~ | run command |
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*** Typecheck
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| Key Binding | Description |
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|-------------+---------------------------------|
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| ~SPC m c t~ | type check the current file |
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| ~SPC m c T~ | type check all the open buffers |
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*** Debug
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| Key Binding | Description |
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|-------------+-----------------------------|
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| ~SPC m d A~ | Attach to a remote debugger |
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| ~SPC m d b~ | set breakpoint |
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| ~SPC m d B~ | clear breakpoint |
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| ~SPC m d C~ | clear all breakpoints |
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| ~SPC m d c~ | continue |
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| ~SPC m d d~ | start a debug session |
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| ~SPC m d i~ | inspect value at point |
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| ~SPC m d l~ | list local variables |
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| ~SPC m d n~ | next |
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| ~SPC m d o~ | step out |
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| ~SPC m d q~ | quit |
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| ~SPC m d r~ | run |
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| ~SPC m d s~ | step |
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| ~SPC m d t~ | backtrace |
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*Note:* These key bindings need a transient-state, PR welcome :-)
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*** Errors
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| Key Binding | Description |
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|-------------+----------------------------------------------------|
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| ~SPC m e e~ | print error at point |
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| ~SPC m e l~ | show all errors and warnings |
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| ~SPC m e s~ | switch to buffer containing the stack trace parser |
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*** Goto
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| Key Binding | Description |
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|-------------+----------------------|
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| ~SPC m g g~ | go to definition |
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| ~SPC m g i~ | go to implementation |
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| ~SPC m g t~ | go to test |
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*** Documentation, Inspect
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| Key Binding | Description |
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|-------------+----------------------------------------|
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| ~SPC m h h~ | show documentation for symbol at point |
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| ~SPC m h u~ | show uses for symbol at point |
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| ~SPC m h t~ | print type at point |
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| ~SPC m i i~ | inspect type at point |
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| ~SPC m i I~ | inspect type in other frame |
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| ~SPC m i p~ | inspect project package |
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| ~SPC m i y~ | yank type at point |
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*** Server
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| Key Binding | Description |
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|-------------+--------------------------------------------------------|
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| ~SPC m n F~ | reload open files |
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| ~SPC m n s~ | start ensime server |
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| ~SPC m n S~ | regenerate the =.ensime= and restart the ensime server |
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*** Refactoring
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| Key Binding | Description |
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|-------------+----------------------------------------------------------------------|
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| ~SPC m r a~ | add type annotation |
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| ~SPC m r f~ | format source |
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| ~SPC m r d~ | get rid of an intermediate variable (=ensime-refactor-inline-local=) |
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| ~SPC m r D~ | get rid of an intermediate variable (=ensime-undo-peek=) |
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| ~SPC m r i~ | organize imports |
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| ~SPC m r m~ | extract a range of code into a method |
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| ~SPC m r r~ | rename a symbol project wide |
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| ~SPC m r t~ | import type at point |
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| ~SPC m r v~ | extract a range of code into a variable |
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| ~SPC m z~ | expand/contract region |
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*** Tests
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| Key Binding | Description |
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|-------------+--------------------------|
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| ~SPC m t a~ | test command (sbt) |
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| ~SPC m t r~ | test quick command (sbt) |
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| ~SPC m t t~ | test only (sbt) |
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*** REPL
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| Key Binding | Description |
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|-------------+---------------------------------------------------------------------|
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| ~SPC m s a~ | ask for a file to be loaded in the REPL |
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| ~SPC m s b~ | send buffer to the REPL |
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| ~SPC m s B~ | send buffer to the REPL and focus the REPL buffer in =insert state= |
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| ~SPC m s i~ | start or switch to the REPL inferior process |
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| ~SPC m s r~ | send region to the REPL |
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| ~SPC m s R~ | send region to the REPL and focus the REPL buffer in =insert state= |
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