646 lines
26 KiB
Org Mode
646 lines
26 KiB
Org Mode
#+TITLE: Java layer
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[[file:img/java.png]]
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* Table of Contents :TOC_4_gh:noexport:
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- [[#description][Description]]
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- [[#features][Features:]]
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- [[#layer-installation][Layer Installation]]
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- [[#layer][Layer]]
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- [[#choosing-a-backend][Choosing a backend]]
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- [[#backends][Backends]]
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- [[#meghanada][Meghanada]]
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- [[#installation][Installation]]
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- [[#about-maven][About Maven]]
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- [[#eclim][Eclim]]
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- [[#installation-1][Installation]]
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- [[#eclipse][Eclipse]]
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- [[#eclim-1][Eclim]]
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- [[#configuration][Configuration]]
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- [[#usage][Usage]]
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- [[#ensime][ENSIME]]
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- [[#installation-when-using-sbt][Installation when using SBT]]
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- [[#installation-when-using-gradle][Installation when using Gradle]]
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- [[#configuration-1][Configuration]]
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- [[#usage-1][Usage]]
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- [[#issues][Issues]]
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- [[#lsp-java][LSP Java]]
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- [[#usage-2][Usage]]
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- [[#key-bindings][Key bindings]]
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- [[#meghanada-1][Meghanada]]
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- [[#server][Server]]
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- [[#navigation][Navigation]]
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- [[#compilation][Compilation]]
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- [[#tests-junit][Tests (junit)]]
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- [[#refactoring][Refactoring]]
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- [[#tasks][Tasks]]
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- [[#eclim-2][Eclim]]
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- [[#java-mode][Java-mode]]
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- [[#ant][Ant]]
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- [[#project-management][Project management]]
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- [[#eclim-daemon][Eclim daemon]]
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- [[#goto][Goto]]
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- [[#refactoring-1][Refactoring]]
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- [[#documentation-find][Documentation, Find]]
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- [[#errors-problems][Errors (problems)]]
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- [[#tests][Tests]]
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- [[#errors-problems-buffer][Errors (problems) buffer]]
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- [[#projects-buffer][Projects buffer]]
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- [[#ensime-key-bindings][Ensime key bindings]]
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- [[#search][Search]]
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- [[#ensime-search-mode][Ensime Search Mode]]
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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-1][Goto]]
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- [[#print-and-yank-types][Print and yank types]]
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- [[#documentation-inspect][Documentation, Inspect]]
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- [[#server-1][Server]]
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- [[#refactoring-2][Refactoring]]
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- [[#tests-1][Tests]]
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- [[#repl][REPL]]
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- [[#lsp-java-1][LSP Java]]
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- [[#code-intelligence-shorcuts][Code intelligence shorcuts]]
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- [[#debugger-shorcuts][Debugger shorcuts]]
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- [[#maven][Maven]]
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- [[#gradle][Gradle]]
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* Description
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This layer adds support for the Java language.
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** Features:
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- Support for the following backends:
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- [[https://github.com/mopemope/meghanada-emacs][Meghanada]] client/server (default),
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- [[http://eclim.org][Eclim]] client/server,
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- [[https://ensime.github.io/][ENSIME]] client/server.
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- [[https://github.com/emacs-lsp/lsp-java][LSP Java]] client/server.
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- Each provides:
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- Auto-completion using company
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- Linting using flycheck integration
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- Maven and Gradle integration
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* Layer Installation
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** Layer
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To use this configuration layer, add it to your =~/.spacemacs=. You will need to
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add =java= to the existing =dotspacemacs-configuration-layers= list in this
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file.
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** Choosing a backend
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To choose a default backend set the layer variable =java-backend=:
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#+BEGIN_SRC elisp
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(java :variables java-backend 'eclim)
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#+END_SRC
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Backend can be chosen on a per project basis using directory local variables
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(files named =.dir-locals.el= at the root of a project), an example to use the
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=eclim= backend:
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#+BEGIN_SRC elisp
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;;; Directory Local Variables
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;;; For more information see (info "(emacs) Directory Variables")
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((java-mode (java-backend . eclim)))
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#+END_SRC
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*Note:* you can easily add a directory local variable with ~SPC f v d~.
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If you want to use the Ensime backend, you should modify your =~/.spacemacs= to
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use the recommended Ensime version (Stable). Please add the following lines to
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=dotspacemacs/user-init=:
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#+BEGIN_SRC emacs-lisp
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(add-to-list 'configuration-layer-elpa-archives '("melpa-stable" . "stable.melpa.org/packages/"))
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(add-to-list 'package-pinned-packages '(ensime . "melpa-stable"))
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#+END_SRC
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* Backends
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** Meghanada
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Meghanada is composed of a lightweight server and an Emacs minor mode. It
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is unintrusive and integrates with =company= and =flycheck=.
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Both =Gradle= and =Maven= projects are compatible with Meghanada.
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Meghanada is the default backend used by this layer, see [[#choosing-a-backend][Choosing a backend]] in
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order to lean how to select a different backend.
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*** Installation
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The Meghanada server will be installed automatically whenever a Java file
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is opened.
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If you get issues with the auto-installation you can either download the last
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version of the server manually [[https://dl.bintray.com/mopemope/meghanada/][there]] or build from source hosted on [[https://github.com/mopemope/meghanada-server][the GitHub
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repository]] and copy the =jar= file to =.emacs.d/.cache/meghanada= folder.
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No additional configuration is necessary!
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*** About Maven
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Maven is not fully supported by Meghanada (but should still work fine for most
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projects). If you encounter disconnection from the server then run =mvn install=
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at the root of your project first.
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** Eclim
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Eclim provides the ability to access Eclipse features such as code completion,
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searching, code validation, and many more.
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*** Installation
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**** Eclipse
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First you need the last version of Eclispe from the [[https://www.eclipse.org/downloads/eclipse-packages/][official Eclipse site]].
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*Note:* if you are on MacOS there some issues between the new native Eclipse
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application installed by the =Eclispe-install.app= wizard and the Eclim
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installer wizard. The recommended way to install Eclipse on MacOS is by using
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=homebrew= or by get the =tar.gz= compressed file instead. With homebrew
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the command line to install Eclipse is =brew cask install eclipse-jee=.
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**** Eclim
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For installation of Eclim check the [[http://eclim.org/install.html#download][official page]] to download the installer
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then double click on it or launch it in the command line with the following
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command (the example is for MacOS, replace the eclispe.home definition by
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your correct location as well as the current version of eclim):
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#+BEGIN_SRC shell
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$ java -Dvim.skip=true -Declipse.home=/Applications/Eclipse.app/Contents/Eclipse -jar eclim_2.6.0.jar install
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#+END_SRC
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*** Configuration
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You may need to set the Eclipse and Eclim paths in your dotfile as layer
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variables or in the =dotspacemacs/user-config=, for instance on MacOS as layer
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variables:
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#+BEGIN_SRC elisp
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(java :variables java-backend 'eclim
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eclim-eclipse-dirs '("/Applications/Eclipse.app/Contents/Eclipse/")
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eclim-executable "/Applications/Eclipse.app/Contents/Eclipse/eclim")
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#+END_SRC
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You can also configure useful other options like the default location for the
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Eclim workspace (default value is =~/workspace=), as shown below:
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#+BEGIN_SRC elisp
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(setq
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;; Specify the workspace to use by default
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eclimd-default-workspace "/path/to/default/eclipse/workspace"
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;; whether autostarting eclimd or not (default nil)
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eclimd-autostart t
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;; Whether or not to block emacs until eclimd is ready (default nil)
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eclimd-wait-for-process t)
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#+END_SRC
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*** Usage
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Start the eclim daemon with ~SPC m D s~ and stop it with ~SPC m D k~. (See
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below.)
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Syntax checking is performed only on demand with ~SPC e e~ to preserve
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perfomance.
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Auto-save feature may freeze Emacs sometimes, use ~C-g~ to unfreeze Emacs or
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atlernatively you can set =dotspacemacs-auto-save-file-location= to nil.
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** ENSIME
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Another backend option is the ENSIME server, which is a lot more responsive than
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Eclim. ENSIME is originally made to work with Scala but it now works with plain
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Java projects as well.
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*** Installation when using SBT
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Find it with your favourite package manager, eg:
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#+BEGIN_SRC shell
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nix-env --install sbt
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#+END_SRC
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or refer to [[http://www.scala-sbt.org/download.html][the sbt installation instructions]].
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*** Installation when using Gradle
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Refer to the [[https://ensime.github.io/build_tools/gradle/][Ensime installation instructions]] to install the =ensime-gradle=
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plugin.
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*** Configuration
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Follow [[https://ensime.github.io/build_tools/sbt/][the ENSIME configuration instructions]]. Spacemacs uses
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the development version of Ensime so follow the appropriate steps.
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To use the build functions under ~SPC m b~ you need to use version =0.13.5= or
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newer of =sbt=, and specify that in your project’s =project/build.properties=.
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For example,
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#+BEGIN_SRC scala
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sbt.version=0.13.11
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#+END_SRC
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*** Usage
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~SPC SPC spacemacs/ensime-gen-and-restart~ or ~SPC m D r~ generates a new config
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for a project and starts the server. Afterwards ~SPC SPC ensime~ or ~SPC m D s~
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will suffice do the trick.
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*** Issues
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ENSIME is originally built for Scala, so support for java is not complete, in
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particular refactoring doesn’t work.
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** LSP Java
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LSP Java is the Java adapter for [[https://github.com/emacs-lsp/lsp-mode][LSP Mode]] which is the Emacs client for [[https://github.com/Microsoft/language-server-protocol][Language Server Protocol]].
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*** Usage
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Open a java file and the ~lsp-java~ will automatically download the server
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and ask you which projects you want to import.
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* Key bindings
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** Meghanada
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*** Server
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| Key binding | Description |
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|-------------+----------------------------------------------|
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| ~SPC m D c~ | Connect to server |
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| ~SPC m D d~ | Disconnect from server |
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| ~SPC m D i~ | Install server (should be done automatically |
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| ~SPC m D k~ | Kill server |
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| ~SPC m D l~ | Clear server cache |
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| ~SPC m D p~ | Ping server |
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| ~SPC m D r~ | Restart server |
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| ~SPC m D s~ | Start server |
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| ~SPC m D u~ | Update server |
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| ~SPC m D v~ | Print version of the server |
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*** Navigation
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| Key binding | Description |
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|-------------+--------------------------------|
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| ~SPC m g b~ | Jump back to previous location |
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| ~SPC m g g~ | Jump to declaration |
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*** Compilation
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| Key binding | Description |
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|-------------+-----------------------|
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| ~SPC m c b~ | Compile file (buffer) |
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| ~SPC m c c~ | Compile project |
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*** Tests (junit)
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| Key binding | Description |
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|-------------+-----------------------------|
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| ~SPC m t a~ | Run all tests |
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| ~SPC m t c~ | Run test class around point |
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| ~SPC m t l~ | Run last tests |
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| ~SPC m t t~ | Run test cause around point |
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*** Refactoring
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| Key binding | Description |
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|-------------+----------------------------------------|
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| ~SPC m =~ | Beautify code |
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| ~SPC m r i~ | Optimize imports |
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| ~SPC m r I~ | Import all |
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| ~SPC m r n~ | Create a new class, interface, or enum |
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*** Tasks
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| Key binding | Description |
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|-------------+-------------|
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| ~SPC m x :~ | Run task |
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** Eclim
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*** Java-mode
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**** Ant
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| Key binding | Description |
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|-------------+-----------------|
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| ~SPC m a a~ | Run Ant |
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| ~SPC m a c~ | Clear Ant cache |
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| ~SPC m a r~ | Run Ant |
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| ~SPC m a v~ | Validate |
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**** Project management
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| Key binding | Description |
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|-------------+--------------------------------|
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| ~SPC m p b~ | Build project |
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| ~SPC m p c~ | Create project |
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| ~SPC m p d~ | Delete project |
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| ~SPC m p g~ | Open file in current project |
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| ~SPC m p i~ | Import project |
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| ~SPC m p j~ | Information about project |
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| ~SPC m p k~ | Close project |
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| ~SPC m p o~ | Open project |
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| ~SPC m p p~ | Open project management buffer |
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| ~SPC m p r~ | Run project |
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| ~SPC m p u~ | Update project |
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**** Eclim daemon
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| Key binding | Description |
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|-------------+--------------|
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| ~SPC m D k~ | Kill daemon |
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| ~SPC m D s~ | Start daemon |
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**** Goto
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| Key binding | Description |
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|-------------+---------------------------------------------|
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| ~M-,~ | jump back from go to declaration/definition |
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| ~SPC m g g~ | go to declaration |
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| ~SPC m g t~ | go to type definition |
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**** Refactoring
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| Key binding | Description |
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|-------------+----------------------------------------|
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| ~SPC m r c~ | create a constructor |
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| ~SPC m r f~ | format file |
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| ~SPC m r g~ | generate getter and setter |
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| ~SPC m r i~ | optimize imports |
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| ~SPC m r j~ | implement or override a method |
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| ~SPC m r n~ | create a new class, enum, or interface |
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| ~SPC m r r~ | rename symbol |
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**** Documentation, Find
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| Key binding | Description |
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|-------------+----------------------------------------|
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| ~SPC m f f~ | general find in project |
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| ~SPC m h c~ | call hierarchy |
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| ~SPC m h h~ | show documentation for symbol at point |
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| ~SPC m h i~ | view hierarchy |
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| ~SPC m h u~ | show usages for symbol at point |
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**** Errors (problems)
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| Key binding | Description |
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|-------------+----------------------------|
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| ~SPC e e~ | Force an error check |
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| ~SPC e l~ | List errors |
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| ~SPC e n~ | Next error |
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| ~SPC e p~ | Previous error |
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| ~SPC m e e~ | Correct error around point |
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**** Tests
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| Key binding | Description |
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|-------------+---------------------------------------------------------------|
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| ~SPC m t t~ | run JUnit tests for current method or current file or project |
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*** Errors (problems) buffer
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| Key binding | Description |
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|-------------+-------------------------------------|
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| ~RET~ | go to problem place |
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| ~a~ | show all problems |
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| ~e~ | show only errors |
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| ~f~ | show problems only for current file |
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| ~g~ | refresh problems |
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| ~q~ | quit |
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| ~w~ | show only warnings |
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*** Projects buffer
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| Key binding | Description |
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|-------------+--------------------------------------------|
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| ~RET~ | go to current project |
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| ~c~ | go to problem place |
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| ~D~ | delete project |
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| ~g~ | refresh buffer |
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| ~i~ | info about current project |
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| ~I~ | import existing project into the workspace |
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| ~m~ | mark current project |
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| ~M~ | mark all projects |
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| ~N~ | create new project |
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| ~o~ | open project |
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| ~p~ | update project |
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| ~q~ | quit |
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| ~R~ | rename current project |
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| ~u~ | unmark current project |
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| ~U~ | unmark all projects |
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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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*** Ensime Search Mode
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| Key binding | Description |
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|-------------+-------------------------------------------------------------------|
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| ~C-j~ | Move to next match |
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| ~C-k~ | Move to previous match |
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| ~C-i~ | Insert at point import of current result |
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| ~RET~ | Jump to the target of the currently selected ensime-search-result |
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| ~C-q~ | Quit ensime search |
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*** sbt
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| Key binding | Description |
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|-------------+---------------------|
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| ~SPC m b .~ | sbt transient state |
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| ~SPC m b b~ | sbt command |
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| ~SPC m b c~ | compile |
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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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*** 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 i~ | inspect value at point |
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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 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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*** Print and yank types
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|-------------+--------------------------------|
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| ~SPC m h T~ | print full type name at point |
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| ~SPC m h t~ | print short type name at point |
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| ~SPC m y T~ | yank full type name at point |
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| ~SPC m y t~ | yank short type name at point |
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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 |
|
||
| ~SPC m h u~ | show uses for symbol at point |
|
||
|
||
*** Server
|
||
|
||
| Key binding | Description |
|
||
|-------------+--------------------------------------------------------|
|
||
| ~SPC m D f~ | reload open files |
|
||
| ~SPC m D r~ | regenerate the =.ensime= and restart the ensime server |
|
||
| ~SPC m D s~ | start ensime server |
|
||
|
||
*** Refactoring
|
||
|
||
| Key binding | Description |
|
||
|-------------+----------------------------------------------------------------------|
|
||
| ~SPC m r a~ | add type annotation |
|
||
| ~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= |
|
||
|
||
** LSP Java
|
||
*** Code intelligence shorcuts
|
||
|
||
| Key binding | Description |
|
||
|---------------+---------------------------------------|
|
||
| ~SPC m g g~ | Go to definition |
|
||
| ~SPC m g r~ | Find references |
|
||
| ~SPC m g R~ | Peek references using ~lsp-ui~ |
|
||
| ~SPC m g d~ | Goto type definition |
|
||
| ~SPC m g a~ | Search type in project |
|
||
| ~SPC m g A~ | Search type in project using ~lsp-ui~ |
|
||
| ~SPC m h h~ | Describe thing at point |
|
||
| ~SPC m e l~ | List project errors/warnings |
|
||
| ~SPC m p u~ | Refresh user settings |
|
||
| ~SPC m e a~ | Execute code action |
|
||
| ~SPC m q r~ | Restart workspace |
|
||
| ~SPC m r o i~ | Organize imports |
|
||
| ~SPC m r r~ | Rename symbol |
|
||
| ~SPC m r a i~ | Add import |
|
||
| ~SPC m r a m~ | Add unimplemented methods |
|
||
| ~SPC m r c p~ | Create parameter |
|
||
| ~SPC m r c f~ | Create field |
|
||
| ~SPC m r e c~ | Extract constant |
|
||
| ~SPC m r e l~ | Extract local |
|
||
| ~SPC m r e m~ | Extract method |
|
||
| ~SPC m c c~ | Build project |
|
||
| ~SPC m a n~ | Actionable notifications |
|
||
| ~SPC m =~ | Format code |
|
||
|
||
*** Debugger shorcuts
|
||
|
||
| Key binding | Description |
|
||
|---------------+---------------------------------|
|
||
| ~SPC m d t t~ | Debug test method |
|
||
| ~SPC m d t c~ | Debug test class |
|
||
| ~SPC m d j~ | Debug java class(main method). |
|
||
|---------------+---------------------------------|
|
||
| ~SPC m t t~ | Run test method |
|
||
| ~SPC m t c~ | Run test class |
|
||
|---------------+---------------------------------|
|
||
| ~SPC m d d d~ | start debugging |
|
||
| ~SPC m d d l~ | debug last configuration |
|
||
| ~SPC m d d r~ | debug recent configuration |
|
||
|---------------+---------------------------------|
|
||
| ~SPC m d c~ | continue |
|
||
| ~SPC m d i~ | step in |
|
||
| ~SPC m d o~ | step out |
|
||
| ~SPC m d s~ | next step |
|
||
| ~SPC m d v~ | inspect value at point |
|
||
| ~SPC m d r~ | restart frame |
|
||
|---------------+---------------------------------|
|
||
| ~SPC m d .~ | debug transient state |
|
||
|---------------+---------------------------------|
|
||
| ~SPC m d a~ | abandon current session |
|
||
| ~SPC m d A~ | abandon all process |
|
||
|---------------+---------------------------------|
|
||
| ~SPC m d e e~ | eval |
|
||
| ~SPC m d e r~ | eval region |
|
||
| ~SPC m d e t~ | eval value at point |
|
||
|---------------+---------------------------------|
|
||
| ~SPC m d S s~ | switch session |
|
||
| ~SPC m d S t~ | switch thread |
|
||
| ~SPC m d S f~ | switch frame |
|
||
|---------------+---------------------------------|
|
||
| ~SPC m d I i~ | inspect |
|
||
| ~SPC m d I r~ | inspect region |
|
||
| ~SPC m d I t~ | inspect value at point |
|
||
|---------------+---------------------------------|
|
||
| ~SPC m d b b~ | toggle a breakpoint |
|
||
| ~SPC m d b c~ | change breakpoint condition |
|
||
| ~SPC m d b l~ | change breakpoint log condition |
|
||
| ~SPC m d b h~ | change breakpoint hit count |
|
||
| ~SPC m d b a~ | add a breakpoint |
|
||
| ~SPC m d b d~ | delete a breakpoint |
|
||
| ~SPC m d b D~ | clear all breakpoints |
|
||
|---------------+---------------------------------|
|
||
| ~SPC m d '_~ | Run debug REPL |
|
||
|---------------+---------------------------------|
|
||
| ~SPC m d w l~ | list local variables |
|
||
| ~SPC m d w o~ | goto output buffer if present |
|
||
| ~SPC m d w s~ | list sessions |
|
||
| ~SPC m d w b~ | list breakpoints |
|
||
|
||
** Maven
|
||
|
||
| Key binding | Description |
|
||
|-----------------+------------------------------------------------------|
|
||
| ~SPC m m c c~ | Compile |
|
||
| ~SPC m m c C~ | Clean |
|
||
| ~SPC m m c r~ | Clean and compile |
|
||
| ~SPC m m g a~ | Switch between class and test file |
|
||
| ~SPC m m g A~ | Switch between class and test file in another window |
|
||
| ~SPC m m t a~ | Run all tests |
|
||
| ~SPC m m t C-a~ | Clean and run all tests |
|
||
| ~SPC m m t b~ | Run current buffer tests |
|
||
| ~SPC m m t i~ | Test and install |
|
||
| ~SPC m m t t~ | Run a specific test |
|
||
|
||
** Gradle
|
||
|
||
| Key binding | Description |
|
||
|---------------+--------------------------|
|
||
| ~SPC m l c c~ | Compile |
|
||
| ~SPC m l c C~ | Clean |
|
||
| ~SPC m l c r~ | Clean and compile |
|
||
| ~SPC m l t a~ | Run all tests |
|
||
| ~SPC m l t b~ | Run current buffer tests |
|
||
| ~SPC m l t t~ | Run a specific test |
|
||
| ~SPC m l x~ | Execute a Gradle task |
|