CustomMarkLineMarkerProvider.kt

package de.dieploegers.develop.idea.custommark

import com.intellij.codeInsight.daemon.RelatedItemLineMarkerInfo
import com.intellij.codeInsight.daemon.RelatedItemLineMarkerProvider
import com.intellij.codeInsight.navigation.NavigationGutterIconBuilder
import com.intellij.icons.AllIcons
import com.intellij.ide.util.DefaultPsiElementCellRenderer
import com.intellij.psi.PsiElement
import java.awt.Color

class CustomMarkLineMarkerProvider : RelatedItemLineMarkerProvider() {
    override fun collectNavigationMarkers(elements: MutableList<PsiElement>,
                                          result: MutableCollection<in RelatedItemLineMarkerInfo<PsiElement>>,
                                          forNavigation: Boolean) {
        for (element in elements) {
            if (element.text != null && element.text.matches(Regex(".*abab.*"))) {
                val renderer = DefaultPsiElementCellRenderer()
                renderer.background = Color(255, 0, 0)
                renderer.foreground = Color(255, 255, 255)
                result.add(
                    NavigationGutterIconBuilder.create(AllIcons.General.Gear)
                        .setTarget(element)
                        .setCellRenderer(renderer)
                        .createLineMarkerInfo(element)
                )
            }
        }
    }
}