TakuSemba

import java.io.File
import java.nio.file.Files.isDirectory

fun removeHederTemplate(directoryName: String) {
  var files = mutableListOf<File>()
  File(directoryName).listFiles()
      .forEach { file ->
        if (file.isFile()) {
          files.add(file)
        } else if (file.isDirectory()) {

TakuSemba

import java.io.File

fun breakLines(directoryName: String) {
  var files = mutableListOf<File>()
  File(directoryName).listFiles()
      .forEach { file ->
        if (file.isFile()) {
          files.add(file)
        } else if (file.isDirectory()) {
          breakLines(file.getAbsolutePath())

TakuSemba

configurations {
  ktlint
}
dependencies {
  ktlint "com.github.shyiko:ktlint:$KTLINT_VERSION"
}

check.dependsOn ktlint

TakuSemba

task ktlint(type: JavaExec, group: "kotlin verification") {
  description = 'Check Kotlin code style.'
  args 'src/**/*.kt'
  main = 'com.github.shyiko.ktlint.Main'
  classpath = configurations.ktlint + sourceSets.main.output
}

task ktFormat(type: JavaExec, group: "kotlin Formatting") {
  description = 'Fix Kotlin code style deviations.'
  args '-F', 'src/**/*.kt'

TakuSemba

class CustomReporter(private val out: PrintStream) : Reporter {
  private val errors = ArrayList<LintError>()

  override fun onLintError(
      file: String,
      err: LintError,
      corrected: Boolean) {
    errors.add(err)
  }
  override fun afterAll() {

TakuSemba

class CustomReporterProvider : ReporterProvider {
  
  override val id: String = “custom-ktlint-reporter"
  
  override fun get(
      out: PrintStream, 
      opt: Map<String, String>
  ): Reporter = CustomReporter(out)
  
}

TakuSemba

// disable specific rule
import package.* // ktlint-disable no-wildcard-imports
// disable the whole rule
import package.* // ktlint-disable

TakuSemba

[*.{kt,kts}]
# possible values: number (e.g. 2), "unset" (makes ktlint ignore indentation completely)  
indent_size=4
# possible values: number (e.g. 2), "unset"
continuation_indent_size=4
# true (recommended) / false
insert_final_newline=unset
# possible values: number (e.g. 120) (package name, imports & comments are ignored), "off"
# it's automatically set to 100 on `ktlint --android ...` (per Android Kotlin Style Guide)
max_line_length=off

TakuSemba

class CustomRule : Rule("custom-rule") {

  override fun visit(
      node: ASTNode,
      autoCorrect: Boolean,
      emit: (offset: Int, errorMessage: String, canBeAutoCorrected: Boolean) -> Unit
  ) {
    if (isLintError) {
      emit(node.startOffset, "Lint Error Found!!!", false)
    }

TakuSemba

// NG
fun add(a: Int, b: Int) = a + b

// OK
fun add(a: Int, b: Int): Int = a + b