1. Plugin and Play
PLUGINS THAT SUPPORT THE FULL SPECTRUM OF KOTLIN FEATURES
19-5-2022
by
Simone
de
Gijt
2. Introduction
Simone de Gijt
2016
2017
2018
2019
2020
2021
…
- Kotlin 1.0 released
- Started working in IT
Google announces that Kotlin is the preferred language of
Android app developers
- Signs contract @ OpenValue
- Starts working with Kotlin
Twitter: @de_gijt
3. What to
expect?
Kover
Code covarage
Options
Advantages / Disadvantages
Ktlint
Linter
Options
Adventages / Disadvantages
Live demo of configurations
Twitter: @de_gijt
4. Kover
{kof· fer}
Kover - Gradle plugin for Kotlin code coverage agents:
IntelliJ and JaCoCo.
Twitter: @de_gijt
6. Options
JaCoCo
Existing tool
Well-known and widely
recognized format
Has some quirks regarding
Kotlin
Twitter: @de_gijt
IntelliJ IDEA
Available in IntelliJ IDEA
Handles Kotlin well
Only available in IntelliJ
IDEA
9. Advantages Kover
Provided by JetBrains
Fully integrated with the Gradle toolchain and multiplatform projects.
Kotlin Android support without the need to divide into build types and flavours
Customizable filters for instrumented classes
Handles specific Kotlin features
Inline functions
Directory structure
…
Twitter: @de_gijt
10. Disadvantages
Still in an experimental state
Only available for Gradle (not Maven)
Engine Jacoco doesn’t support Kotlin
Directory Structure
Verification is only on LINE-level
Twitter: @de_gijt
13. Advantages
It saves time!
It saves energy
It simplifies your process
Twitter: @de_gijt
14. Plugin options
JLLeitschuh:
Gradle wrapper over
the pinterest project
Adds special tasks
Twitter: @de_gijt
Pinterest:
Static code analysis
tool that is used to
analyse the Kotlin
code for you.
Follows the official
Kotlin code style
GantSign:
Maven wrapper
over the
pinterest
project
15. Detekt
{de· tect}
Detekt - A static code analysis tool for
the Kotlin programming language.
Twitter: @de_gijt
László Kövér is a Hungarian politician and the current speaker of the National Assembly of Hungary.
Kover is pronounced the same as the Dutch word for suitcase.
https://github.com/Kotlin/kotlinx-kover
Source:
Kover – The Code Coverage Plugin https://www.youtube.com/watch?v=jNu5LY9HIbw
Sources:
Kover – The Code Coverage Plugin https://www.youtube.com/watch?v=jNu5LY9HIbw
https://github.com/Kotlin/kotlinx-kover
https://kotlinlang.org/docs/multiplatform.html
Sources
https://blog.mindorks.com/code-formatting-in-kotlin-using-ktlint
https://github.com/JLLeitschuh/ktlint-gradle
https://github.com/pinterest/ktlint
https://github.com/gantsign/ktlint-maven-plugin
https://megalinter.github.io/latest/installation/
JLLeitschuh: The plugin can be applied to any project, but only activates if that project has the kotlin plugin applied
Check tasks support change files to be checked incrementally. On the first run, the task will check all files in the source set, on subsequent runs it will check only added/modified files.
IntelliJ IDEA: recommended to work with the ktlint install from brew
ComplexCondition
Demo Kover:
Start with JaCoCo
Show you can not see the class in the report (because of directory structure)
Show inline function is not ”covered”
Show IntelliJ
Add Kover to the plugins
Run report
Open as HTML and show that you now can see the class-file including the coverage of the inline function
Show that test classes are also tested by default
Unmute integrationtests -> no additional config like with jacoco
Standard: test is without Kover -> add config
Show that you can exclude classes from Kover (both extension + report)
Show kover config
koverVerify
Maybe subprojects (merged reports)
Demo ktlint:
Basic project without a lint; show format-error in service -> build -> no issues
Add ktlint (normal plugin) to project: show all new tasks
Show that if you only want intellij idea tasks you can add -idea in the plugin: build, after ktlintCheck
2 options:
Create baseline: ktlintGenerateBaseline
Format via: ktlintFormat / option+command+l
Git integration:
addKtlintCheckGitPreCommitHook
addKtlintFormatGitPreCommitHook
Add plugin Nick Badal
Actions on save
Additional config file:
Without editorconfig file or ktlint plugin the rules of preferences are applied (KOTLIN)
You can overwrite this by the editorconfig file (no extra config needed)
Source:
https://medium.com/@vanniktech/writing-your-first-ktlint-rule-5a1707f4ca5b
