Intellij IDEA is a Java IDE that supports Scala. It has two editions and uses a project/module structure to organize code. Key features include code completion, navigation, refactoring, version control integration with Git/GitHub, and support for build tools like SBT. The document provides tips on setting preferences and keymaps, importing and working with SBT projects, debugging, and improving performance for large codebases.

1. Intellij IDEA
Intro, Tips and Tricks
vitojeng
vito@is-land.com.tw
2017.11.21

2. Intro
● IntelliJ IDEA is a Java integrated development environment (IDE) for developing
computer software. (wikipedia)
● Two editions
○ Ultimate Edition
○ Community Edition - opensourced in github
○ Comparison matrix
● We use community edition in this talk.

3. Languages support
Rust(WIP)

4. User Interface
● Default IDE Layout
○ Menu & Toolbar
○ Navigation bar
○ Status bar
○ Editor
○ Tool Windows
● Keymap
● Help

5. Help

6. ● Project(What is project?)
○ Configuration format
■ Directory-based(.idea/, *.xml)
■ File-based(.ipr, *.iws)
● Module(What is a module?)
○ .iml
● Version control(if you want)
○ .xml , .ipr, .iml
○ Exclude:
■ workspace.xml
■ *.iws
Project & Module concept
Intellij
Window 1
Window 2
Project A
Project B
Module A1
Module A2
Module B1
Module B2

7. Choose a Suitable Keymap is Important
Mac OS X 10.5+ : If you are using IntelliJ
IDEA only on Mac OS, we recommend
choosing the schema named “Mac OS X
10.5+”.
Mac OS X : The default “Mac OS X” schema
is recommended if you use IntelliJ IDEA on
other platforms too as the bindings are more
alike to the default Windows/Linux schema.
I use Mac OS X keymap in multi-platforms.

8. Scala Guidelines
● https://www.jetbrains.com/help/idea/
scala.html
● Search help

9. New Project in Intellij IDEA(without SBT)
● Just Play Scala !
● New Project Wizard
○ File | New | Project...
■ Java - Add Scala Libraries
■ Scala - IDEA-based Scala project

10. New / Import Project in Intellij IDEA(with SBT)
● Many Scala project use SBT.
● New Project Wizard
○ File | New | Project...
■ SBT-based Scala project
● Import Project Wizard
○ File | New | Project from Existing Sources...
■ choose a folder(existing SBT project)
● Import project from external model (SBT/Gradle/Maven)

11. Working with SBT
● Tool Windows
○ Project
○ SBT
○ SBT Shell
● Attach debugger to SBT
Shell

12. Working with Scala Worksheet
● REPL mode in Intellij IDEA
● How about Ammonite support ?
○ Look like there will be something in 2017.3(public preview)
○ Stay tuned ! (github, youtrack)

13. Desugar Scala
● Code | Desugar Scala code ...
● Show Diff

14. Work with Git / Github
● Import Git / Github project
○ Command line
■ $ git clone
■ File | New | Project from Existing Sources...
■ Import SBT project
○ User interface
■ File | New | Project from Version Control | Github
■ SBT project detected: Import SBT project

15. Work with Git / Github
● Mutiple Version Control in the same Project
○ Mutiple git repo
○ Mix with different version control

16. Work with Git / Github
● Switch Branch
● Local Changes
● Log
● Show History
● Show Diff

17. ● Keyboard Shortcuts You Cannot Miss
● Example
● Help | Keymap Reference
Keymap & Keyboard Shortcuts

18. Menu - Edit | Find / Replace
● Find... / Replace...
● Find in Path... / Replace in Path...
● Find Usages
● Search Structurally...

19. Menu - View
● Quick Definition
● Quick Documentation
● Recent Files
● Compare With...

20. Menu - Navigate
● Class...
● File...
● Symbol...
● Select In...
● File Structure

21. Menu - Code
● Generate...
● Surround With...
● Unwrap/Remove...
● Desugar Scala code...

22. Menu - Refactor

23. Menu - Build / Run / Tools

24. Look into Large Project
● Add Scope
○ Preferences | Appearance & Behavior | Scopes
● Edit | Find | Find in Path...
○ Use Scope
○ Filter
● Edit | Find | Search Structurally...
● Navigate | Type Hierarchy
● Navigate | Method Hierarchy
● Navigate | Call Hierarchy

25. Look into Large Project
● Menu: Analyze
○ Analyze Dependencies ...
○ Analyze Backward Dependencies ...
○

26. Markdown support

27. Performance
● Intellij IDEA's cache is sometimes not quite right enough to cause performance
issue.
○ Rebuild cache
■ File | Invalidate Caches / Restart
● Too many Scala classes may cause very slow editor response
○ Turn off some inspections of Scala
■ Preferences | Editor | Inspections | Scala Category

28. Join ScalaTaiwan Gitter Room!
https://gitter.im/ScalaTaiwan/ScalaTaiwan

29. Thank you !