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spacemacs/layers/+lang/scala
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justbur 6eab954afe Use + instead of ! for layer categories 
Helm seems to treat "!" specially in pattern matching, so having a ! in
the pattern string when traversing directories is problematic. This
change fixes #2737, because as far as I can tell "+" has no special
meaning in a helm pattern.

Of course, we can choose a different character, but I'm fond of "+" as
representing "more layers here".
2015-09-11 00:13:51 -04:00
..
img Use + instead of ! for layer categories 2015-09-11 00:13:51 -04:00
funcs.el Use + instead of ! for layer categories 2015-09-11 00:13:51 -04:00
packages.el Use + instead of ! for layer categories 2015-09-11 00:13:51 -04:00
README.org Use + instead of ! for layer categories 2015-09-11 00:13:51 -04:00

README.org

Scala contribution layer for Spacemacs

/TakeV/spacemacs/media/commit/bac79f03b7d8eb8a3c4277371a33cd50b8736e8b/layers/+lang/scala/img/scala.png with /TakeV/spacemacs/media/commit/bac79f03b7d8eb8a3c4277371a33cd50b8736e8b/layers/+lang/scala/img/ensime.png

Table of Contents   TOC@4

Description

This layer adds support for the Scala language using the excellent ENSIME client/server.

Layer Installation

Add this contribution to your ~/.spacemacs.

  (setq-default dotspacemacs-configuration-layers '(scala))

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

  1. Configure the ENSIME sbt plugin by adding the following to ~/.sbt/0.13/plugins/plugins.sbt:

    resolvers += Resolver.sonatypeRepo("snapshots")

addSbtPlugin("org.ensime" % "ensime-sbt" % "0.1.7-SNAPSHOT")
  2. Run sbt at the shell to download and install the plugin.

See the ENSIME quickstart guide for further information.

Usage

  1. Create a .ensime file at the root of your Scala project using sbt gen-ensime 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

Scalastyle provides style-checking and linting. The Emacs functionality is provided by Flycheck.

To use scalastyle,

  1. Download the 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 flycheck documentation for up-to-date configuration instructions.

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 micro-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

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 h t print type 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 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