Debug tools

Closes #18

README.md

@@ -4,6 +4,8 @@ Displays errors, warnings, and other inspections inline. Highlights the backgrou
 
 By default, the plugin shows **Errors**, **Warnings**, **Weak Warnings**, **Server Problems**, **Grammar Errors**, **Typos**, and other inspections with a high enough severity level. Configure visible severities in **Settings | Tools | Inspection Lens**.
 
+Left-click an inspection to show quick fixes. Middle-click an inspection to navigate to the relevant code in the editor.
+
 Inspired by [Error Lens](https://marketplace.visualstudio.com/items?itemName=usernamehw.errorlens) for Visual Studio Code, and [Inline Error](https://plugins.jetbrains.com/plugin/17302-inlineerror) for IntelliJ Platform.
 
 ![Inspection Lens Screenshot](.github/readme/intellij.png)

build.gradle.kts

@@ -8,7 +8,7 @@ plugins {
 }
 
 group = "com.chylex.intellij.inspectionlens"
-version = "1.4.1"
+version = "1.5"
 
 repositories {
 	mavenCentral()

src/main/kotlin/com/chylex/intellij/inspectionlens/debug/ShowColorEditorAction.kt

@@ -0,0 +1,274 @@
+package com.chylex.intellij.inspectionlens.debug
+
+import com.chylex.intellij.inspectionlens.editor.lens.ColorGenerator
+import com.chylex.intellij.inspectionlens.editor.lens.ColorMode
+import com.chylex.intellij.inspectionlens.editor.lens.EditorLens
+import com.chylex.intellij.inspectionlens.editor.lens.LensSeverity
+import com.intellij.codeInsight.daemon.impl.HighlightInfo
+import com.intellij.codeInsight.daemon.impl.HighlightInfoType
+import com.intellij.grazie.ide.TextProblemSeverities
+import com.intellij.lang.annotation.HighlightSeverity
+import com.intellij.openapi.Disposable
+import com.intellij.openapi.actionSystem.ActionUpdateThread
+import com.intellij.openapi.actionSystem.AnAction
+import com.intellij.openapi.actionSystem.AnActionEvent
+import com.intellij.openapi.components.service
+import com.intellij.openapi.editor.Editor
+import com.intellij.openapi.editor.EditorFactory
+import com.intellij.openapi.editor.colors.EditorColorsManager
+import com.intellij.openapi.editor.colors.EditorColorsScheme
+import com.intellij.openapi.editor.event.CaretEvent
+import com.intellij.openapi.editor.event.CaretListener
+import com.intellij.openapi.editor.event.SelectionEvent
+import com.intellij.openapi.editor.event.SelectionListener
+import com.intellij.openapi.editor.ex.EditorEx
+import com.intellij.openapi.project.Project
+import com.intellij.openapi.ui.DialogPanel
+import com.intellij.openapi.ui.DialogWrapper
+import com.intellij.openapi.util.Disposer
+import com.intellij.openapi.util.Key
+import com.intellij.spellchecker.SpellCheckerSeveritiesProvider
+import com.intellij.ui.ColorUtil
+import com.intellij.ui.dsl.builder.Align
+import com.intellij.ui.dsl.builder.Cell
+import com.intellij.ui.dsl.builder.LabelPosition
+import com.intellij.ui.dsl.builder.Row
+import com.intellij.ui.dsl.builder.panel
+import com.intellij.ui.dsl.builder.selected
+import javax.swing.Action
+import javax.swing.JSlider
+
+class ShowColorEditorAction : AnAction() {
+	override fun getActionUpdateThread(): ActionUpdateThread {
+		return ActionUpdateThread.BGT
+	}
+	
+	override fun actionPerformed(e: AnActionEvent) {
+		Dialog(e.project).show()
+	}
+	
+	private class Dialog(project: Project?) : DialogWrapper(project) {
+		private val editorSyncer = EditorSyncer(disposable)
+		
+		init {
+			title = "Inspection Lens - Color Editor"
+			init()
+		}
+		
+		@Suppress("DuplicatedCode")
+		override fun createCenterPanel(): DialogPanel {
+			return panel {
+				row {
+					for (scheme in EditorColorsManager.getInstance().allSchemes.sortedWith(compareBy({ ColorUtil.isDark(it.defaultBackground) }, { it.displayName }))) {
+						createEditor(scheme)
+					}
+				}.resizableRow()
+				
+				row {
+					val generateColors = checkBox("Generate colors")
+						.selected(ColorGenerator.useGenerator)
+						.onChanged {
+							ColorGenerator.useGenerator = it.isSelected
+							refreshColors()
+						}
+					
+					slider(0, 15, 1, 5)
+						.label("Light theme desaturation", LabelPosition.TOP)
+						.enabledIf(generateColors.selected)
+						.bindColorValue(ColorGenerator::lightThemeDesaturation) { ColorGenerator.lightThemeDesaturation = it }
+					
+					slider(0, 15, 1, 5)
+						.label("Dark theme desaturation", LabelPosition.TOP)
+						.enabledIf(generateColors.selected)
+						.bindColorValue(ColorGenerator::darkThemeDesaturation) { ColorGenerator.darkThemeDesaturation = it }
+					
+					slider(0, 100, 5, 25)
+						.label("Light theme threshold", LabelPosition.TOP)
+						.enabledIf(generateColors.selected)
+						.bindColorValue(ColorGenerator::lightThemeThreshold) { ColorGenerator.lightThemeThreshold = it }
+					
+					slider(0, 100, 5, 25)
+						.label("Dark theme threshold", LabelPosition.TOP)
+						.enabledIf(generateColors.selected)
+						.bindColorValue(ColorGenerator::darkThemeThreshold) { ColorGenerator.darkThemeThreshold = it }
+					
+					slider(0, 25, 1, 5)
+						.label("Light theme line alpha", LabelPosition.TOP)
+						.enabledIf(generateColors.selected)
+						.bindColorValue(ColorGenerator::lightThemeLineAlpha) { ColorGenerator.lightThemeLineAlpha = it }
+					
+					slider(0, 25, 1, 5)
+						.label("Dark theme line alpha", LabelPosition.TOP)
+						.enabledIf(generateColors.selected)
+						.bindColorValue(ColorGenerator::darkThemeLineAlpha) { ColorGenerator.darkThemeLineAlpha = it }
+				}
+			}
+		}
+		
+		private fun Row.createEditor(scheme: EditorColorsScheme) {
+			val editor = createPreviewEditor(scheme, disposable)
+			editorSyncer.add(editor)
+			
+			panel {
+				row {
+					cell(editor.component)
+						.label(scheme.displayName, LabelPosition.TOP)
+						.align(Align.FILL)
+						.resizableColumn()
+				}.resizableRow()
+			}.resizableColumn()
+		}
+		
+		private fun Cell<JSlider>.bindColorValue(getter: () -> Int, setter: (Int) -> Unit): Cell<JSlider> {
+			return applyToComponent {
+				value = getter()
+				toolTipText = value.toString()
+				
+				addChangeListener {
+					toolTipText = value.toString()
+					setter(value)
+					refreshColors()
+				}
+			}
+		}
+		
+		private fun refreshColors() {
+			for (severity in LensSeverity.values()) {
+				severity.refreshColors()
+			}
+			
+			for (editor in editorSyncer.editors) {
+				recreateLenses(editor)
+			}
+		}
+		
+		override fun createActions(): Array<Action> {
+			return arrayOf(okAction)
+		}
+		
+		override fun getDimensionServiceKey(): String {
+			return this::class.java.name
+		}
+	}
+	
+	private class EditorSyncer(private val disposable: Disposable) {
+		val editors = mutableListOf<Editor>()
+		
+		fun add(editor: Editor) {
+			editors.add(editor)
+			
+			editor.caretModel.addCaretListener(object : CaretListener {
+				override fun caretPositionChanged(event: CaretEvent) {
+					syncCarets(editor)
+				}
+				
+				override fun caretAdded(event: CaretEvent) {
+					syncCarets(editor)
+				}
+				
+				override fun caretRemoved(event: CaretEvent) {
+					syncCarets(editor)
+				}
+			}, disposable)
+			
+			editor.selectionModel.addSelectionListener(object : SelectionListener {
+				override fun selectionChanged(e: SelectionEvent) {
+					syncCarets(editor)
+				}
+			}, disposable)
+		}
+		
+		private var isSyncing = false
+		
+		private fun syncCarets(mainEditor: Editor) {
+			val caretsAndSelections = mainEditor.caretModel.caretsAndSelections
+			
+			syncEditors(mainEditor) {
+				it.caretModel.caretsAndSelections = caretsAndSelections
+			}
+		}
+		
+		private inline fun syncEditors(mainEditor: Editor, action: (Editor) -> Unit) {
+			if (isSyncing) {
+				return
+			}
+			
+			isSyncing = true
+			try {
+				for (editor in editors) {
+					if (editor !== mainEditor) {
+						action(editor)
+					}
+				}
+			} finally {
+				isSyncing = false
+			}
+		}
+	}
+	
+	private companion object {
+		private val SEVERITIES = listOf(
+			HighlightSeverity.ERROR,
+			HighlightSeverity.WARNING,
+			HighlightSeverity.WEAK_WARNING,
+			HighlightSeverity.GENERIC_SERVER_ERROR_OR_WARNING,
+			TextProblemSeverities.STYLE_SUGGESTION,
+			SpellCheckerSeveritiesProvider.TYPO,
+			HighlightSeverity("Other", 50)
+		)
+		
+		private val LENSES_KEY = Key.create<MutableList<EditorLens>>("InspectionLens.ShowColorEditorAction.Lenses")
+		
+		private fun createPreviewEditor(scheme: EditorColorsScheme, disposable: Disposable): Editor {
+			val editorFactory = EditorFactory.getInstance()
+			
+			val document = editorFactory.createDocument(('A'..'Z').take(SEVERITIES.size * 3).joinToString(separator = "\n", postfix = "\n\n") { "$it = 0;" })
+			val editor = editorFactory.createViewer(document) as EditorEx
+			
+			editor.colorsScheme = scheme
+			editor.caretModel.moveToOffset(editor.document.textLength)
+			
+			with(editor.settings) {
+				additionalColumnsCount = 0
+				additionalLinesCount = 0
+				isIndentGuidesShown = false
+				isLineMarkerAreaShown = false
+				isLineNumbersShown = true
+				isRightMarginShown = false
+				isWhitespacesShown = true
+				setGutterIconsShown(false)
+			}
+			
+			ColorMode.setForEditor(editor, if (ColorUtil.isDark(scheme.defaultBackground)) ColorMode.ALWAYS_DARK else ColorMode.ALWAYS_LIGHT)
+			recreateLenses(editor)
+			
+			Disposer.register(disposable) { editorFactory.releaseEditor(editor) }
+			return editor
+		}
+		
+		private fun recreateLenses(editor: Editor) {
+			LENSES_KEY.get(editor)?.forEach(EditorLens::hide)
+			
+			val lenses = mutableListOf<EditorLens>()
+			LENSES_KEY.set(editor, lenses)
+			
+			for ((index, severity) in SEVERITIES.withIndex()) {
+				addLens(editor, severity, index, lenses)
+				addLens(editor, severity, (index * 2) + 1 + SEVERITIES.size, lenses)
+			}
+		}
+		
+		private fun addLens(editor: Editor, severity: HighlightSeverity, line: Int, list: MutableList<EditorLens>) {
+			val startOffset = editor.document.getLineStartOffset(line)
+			val endOffset = editor.document.getLineEndOffset(line)
+			
+			val highlightInfo = HighlightInfo.newHighlightInfo(HighlightInfoType.ERROR)
+				.severity(severity)
+				.range(startOffset, endOffset)
+				.descriptionAndTooltip("Example - ${severity.displayCapitalizedName}")
+				.createUnconditionally()
+			
+			EditorLens.show(editor, highlightInfo, service())?.let(list::add)
+		}
+	}
+}

src/main/kotlin/com/chylex/intellij/inspectionlens/editor/EditorLensFeatures.kt

@@ -2,6 +2,7 @@ package com.chylex.intellij.inspectionlens.editor
 
 import com.intellij.openapi.Disposable
 import com.intellij.openapi.editor.Editor
+import com.intellij.openapi.editor.ex.FoldingModelEx
 import com.intellij.openapi.editor.ex.MarkupModelEx
 import com.intellij.openapi.editor.impl.DocumentMarkupModel
 import com.intellij.openapi.util.Disposer
@@ -13,6 +14,7 @@ import com.intellij.openapi.util.Key
 internal class EditorLensFeatures private constructor(
 	editor: Editor,
 	private val markupModel: MarkupModelEx,
+	foldingModel: FoldingModelEx?,
 	disposable: Disposable
 ) {
 	private val lensManager = EditorLensManager(editor)
@@ -22,6 +24,8 @@ internal class EditorLensFeatures private constructor(
 	init {
 		markupModel.addMarkupModelListener(disposable, markupModelListener)
 		markupModelListener.showAllValid(markupModel.allHighlighters)
+		
+		foldingModel?.addListener(LensFoldingModelListener(lensManager), disposable)
 	}
 	
 	private fun refresh() {
@@ -38,7 +42,8 @@ internal class EditorLensFeatures private constructor(
 			}
 			
 			val markupModel = DocumentMarkupModel.forDocument(editor.document, editor.project, false) as? MarkupModelEx ?: return
-			val features = EditorLensFeatures(editor, markupModel, disposable)
+			val foldingModel = editor.foldingModel as? FoldingModelEx
+			val features = EditorLensFeatures(editor, markupModel, foldingModel, disposable)
 			
 			editor.putUserData(EDITOR_KEY, features)
 			Disposer.register(disposable) { editor.putUserData(EDITOR_KEY, null) }

src/main/kotlin/com/chylex/intellij/inspectionlens/editor/EditorLensManager.kt

@@ -56,6 +56,10 @@ internal class EditorLensManager(private val editor: Editor) {
 		}
 	}
 	
+	fun onFoldRegionsChanged() {
+		lenses.values.forEach(EditorLens::onFoldRegionsChanged)
+	}
+	
 	sealed interface Command {
 		fun apply(lensManager: EditorLensManager)
 		

src/main/kotlin/com/chylex/intellij/inspectionlens/editor/LensFoldingModelListener.kt

@@ -0,0 +1,12 @@
+package com.chylex.intellij.inspectionlens.editor
+
+import com.intellij.openapi.editor.ex.FoldingListener
+
+/**
+ * Listens for code folding events and reports them to [EditorLensManager].
+ */
+internal class LensFoldingModelListener(private val lensManager: EditorLensManager) : FoldingListener {
+	override fun onFoldProcessingEnd() {
+		lensManager.onFoldRegionsChanged()
+	}
+}

src/main/kotlin/com/chylex/intellij/inspectionlens/editor/lens/ColorGenerator.kt

@@ -0,0 +1,80 @@
+package com.chylex.intellij.inspectionlens.editor.lens
+
+import com.intellij.ui.ColorUtil
+import java.awt.Color
+import java.util.Locale
+import kotlin.math.abs
+import kotlin.math.pow
+
+internal object ColorGenerator {
+	private const val HACK_BRIGHTNESS_STEP = 1.025F
+	
+	var useGenerator = false
+	var lightThemeDesaturation = 1
+	var lightThemeThreshold = 32
+	var lightThemeLineAlpha = 10
+	var darkThemeDesaturation = 2
+	var darkThemeThreshold = 62
+	var darkThemeLineAlpha = 13
+	
+	data class Theme(
+		val lightThemeTextColor: Color,
+		val lightThemeLineColor: Color,
+		val darkThemeTextColor: Color,
+		val darkThemeLineColor: Color,
+	)
+
+	fun generate(name: String, baseColor: Color): Theme {
+		val lightThemeTextColor: Color = findColorWithPerceivedBrightness("$name / Light", baseColor, lightThemeDesaturation, 50 downTo -50) { it <= lightThemeThreshold }
+		val darkThemeTextColor: Color = findColorWithPerceivedBrightness("$name / Dark", baseColor, darkThemeDesaturation, -50..50) { it >= darkThemeThreshold }
+		
+		val lightThemeLineColor = ColorUtil.toAlpha(lightThemeTextColor, lightThemeLineAlpha)
+		val darkThemeLineColor = ColorUtil.toAlpha(darkThemeTextColor, darkThemeLineAlpha)
+		
+		return Theme(lightThemeTextColor, lightThemeLineColor, darkThemeTextColor, darkThemeLineColor)
+	}
+	
+	private fun findColorWithPerceivedBrightness(name: String, baseColor: Color, desaturation: Int, steps: IntProgression, testPerceivedBrightness: (Double) -> Boolean): Color {
+		var finalColor = baseColor
+		var finalBrightening = 0
+		var finalPerceivedBrightness = 0.0
+		
+		for (brightening in steps) {
+			finalColor = ColorUtil.desaturate(ColorUtil.hackBrightness(baseColor, abs(brightening), if (brightening < 0) 1F / HACK_BRIGHTNESS_STEP else HACK_BRIGHTNESS_STEP), desaturation)
+			finalBrightening = brightening
+			finalPerceivedBrightness = getPerceivedBrightness(finalColor)
+			
+			if (testPerceivedBrightness(finalPerceivedBrightness)) {
+				break
+			}
+		}
+		
+		println("$name - ${baseColor.red},${baseColor.green},${baseColor.blue} --> step $finalBrightening; brightness ${String.format(Locale.ROOT, "%.2f", finalPerceivedBrightness)}; color ${finalColor.red},${finalColor.green},${finalColor.blue}")
+		return finalColor
+	}
+	
+	private fun getLuminance(r: Double, g: Double, b: Double): Double {
+		return 0.2126 * srgbToLinearRgb(r) + 0.7152 * srgbToLinearRgb(g) + 0.0722 * srgbToLinearRgb(b)
+	}
+	
+	private fun srgbToLinearRgb(channel: Double): Double {
+		return if (channel <= 0.04045)
+			channel / 12.92
+		else
+			((channel + 0.055) / 1.055).pow(2.4)
+	}
+	
+	private fun getPerceivedBrightness(luminance: Double): Double {
+		return if (luminance <= (216.0 / 24389.0))
+			luminance * (24389.0 / 27.0)
+		else
+			luminance.pow(1.0 / 3.0) * 116 - 16
+	}
+	
+	private fun getPerceivedBrightness(color: Color): Double {
+		val r = color.red / 255.0
+		val g = color.green / 255.0
+		val b = color.blue / 255.0
+		return getPerceivedBrightness(getLuminance(r, g, b))
+	}
+}

src/main/kotlin/com/chylex/intellij/inspectionlens/editor/lens/ColorMode.kt

@@ -0,0 +1,35 @@
+package com.chylex.intellij.inspectionlens.editor.lens
+
+import com.intellij.openapi.editor.Editor
+import com.intellij.openapi.util.Key
+import com.intellij.ui.JBColor
+import java.awt.Color
+import java.util.EnumMap
+
+internal enum class ColorMode {
+	AUTO,
+	ALWAYS_LIGHT,
+	ALWAYS_DARK;
+	
+	companion object {
+		private val KEY = Key.create<ColorMode>("InspectionLens.ColorMode")
+		
+		fun getFromEditor(editor: Editor): ColorMode {
+			return KEY.get(editor, AUTO)
+		}
+		
+		fun setForEditor(editor: Editor, colorMode: ColorMode) {
+			KEY.set(editor, colorMode)
+		}
+		
+		inline fun createColorAttributes(lightThemeColor: Color, darkThemeColor: Color, attributesFactory: (JBColor) -> LensSeverityTextAttributes): EnumMap<ColorMode, LensSeverityTextAttributes> {
+			val result = EnumMap<ColorMode, LensSeverityTextAttributes>(ColorMode::class.java)
+			
+			result[AUTO] = attributesFactory(JBColor(lightThemeColor, darkThemeColor))
+			result[ALWAYS_LIGHT] = attributesFactory(JBColor(lightThemeColor, lightThemeColor))
+			result[ALWAYS_DARK] = attributesFactory(JBColor(darkThemeColor, darkThemeColor))
+			
+			return result
+		}
+	}
+}

src/main/kotlin/com/chylex/intellij/inspectionlens/editor/lens/EditorLens.kt

@@ -4,15 +4,18 @@ import com.chylex.intellij.inspectionlens.settings.LensSettingsState
 import com.intellij.codeInsight.daemon.impl.HighlightInfo
 import com.intellij.openapi.editor.Editor
 
-internal class EditorLens private constructor(private var inlay: EditorLensInlay, private var lineBackground: EditorLensLineBackground) {
+internal class EditorLens private constructor(private var inlay: EditorLensInlay, private var lineBackground: EditorLensLineBackground, private var severity: LensSeverity) {
 	fun update(info: HighlightInfo, settings: LensSettingsState): Boolean {
 		val editor = inlay.editor
+		val oldSeverity = severity
+		
+		severity = LensSeverity.from(info.severity)
 		
 		if (!inlay.tryUpdate(info)) {
 			inlay = EditorLensInlay.show(editor, info, settings) ?: return false
 		}
 		
-		if (lineBackground.shouldRecreate(info)) {
+		if (lineBackground.isInvalid || oldSeverity != severity) {
 			lineBackground.hide(editor)
 			lineBackground = EditorLensLineBackground.show(editor, info)
 		}
@@ -20,18 +23,21 @@ internal class EditorLens private constructor(private var inlay: EditorLensInlay
 		return true
 	}
 	
-	fun hide() {
-		val editor = inlay.editor
+	fun onFoldRegionsChanged() {
+		lineBackground.onFoldRegionsChanged(inlay.editor, severity)
+	}
 	
+	fun hide() {
 		inlay.hide()
-		lineBackground.hide(editor)
+		lineBackground.hide(inlay.editor)
 	}
 	
 	companion object {
 		fun show(editor: Editor, info: HighlightInfo, settings: LensSettingsState): EditorLens? {
 			val inlay = EditorLensInlay.show(editor, info, settings) ?: return null
 			val lineBackground = EditorLensLineBackground.show(editor, info)
-			return EditorLens(inlay, lineBackground)
+			val severity = LensSeverity.from(info.severity)
+			return EditorLens(inlay, lineBackground, severity)
 		}
 	}
 }

src/main/kotlin/com/chylex/intellij/inspectionlens/editor/lens/EditorLensInlay.kt

@@ -36,7 +36,9 @@ internal value class EditorLensInlay(private val inlay: Inlay<LensRenderer>) {
 				.disableSoftWrapping(true)
 				.priority(priority)
 			
-			return editor.inlayModel.addAfterLineEndElement(offset, properties, renderer)?.let(::EditorLensInlay)
+			return editor.inlayModel.addAfterLineEndElement(offset, properties, renderer)
+				?.also(renderer::setInlay)
+				?.let(::EditorLensInlay)
 		}
 		
 		/**

src/main/kotlin/com/chylex/intellij/inspectionlens/editor/lens/EditorLensLineBackground.kt

@@ -2,33 +2,21 @@ package com.chylex.intellij.inspectionlens.editor.lens
 
 import com.intellij.codeInsight.daemon.impl.HighlightInfo
 import com.intellij.openapi.editor.Editor
+import com.intellij.openapi.editor.ex.RangeHighlighterEx
 import com.intellij.openapi.editor.markup.HighlighterLayer
 import com.intellij.openapi.editor.markup.HighlighterTargetArea.LINES_IN_RANGE
 import com.intellij.openapi.editor.markup.RangeHighlighter
+import com.intellij.openapi.editor.markup.TextAttributes
 
 @JvmInline
 internal value class EditorLensLineBackground(private val highlighter: RangeHighlighter) {
-	@Suppress("RedundantIf")
-	fun shouldRecreate(info: HighlightInfo): Boolean {
-		if (!highlighter.isValid) {
-			return true
+	val isInvalid
+		get() = !highlighter.isValid
+	
+	fun onFoldRegionsChanged(editor: Editor, severity: LensSeverity) {
+		if (highlighter is RangeHighlighterEx) {
+			highlighter.textAttributes = getAttributes(editor, highlighter.startOffset, highlighter.endOffset, severity)
 		}
-		
-		val severity = LensSeverity.from(info.severity)
-		
-		val currentTextAttributes = highlighter.getTextAttributes(null)
-		val newTextAttributes = severity.lineAttributes
-		if (currentTextAttributes !== newTextAttributes) {
-			return true
-		}
-		
-		val currentLayer = highlighter.layer
-		val newLayer = getHighlightLayer(severity)
-		if (currentLayer != newLayer) {
-			return true
-		}
-		
-		return false
 	}
 	
 	fun hide(editor: Editor) {
@@ -42,12 +30,20 @@ internal value class EditorLensLineBackground(private val highlighter: RangeHigh
 			
 			val severity = LensSeverity.from(info.severity)
 			val layer = getHighlightLayer(severity)
+			val attributes = getAttributes(editor, startOffset, endOffset, severity)
 			
-			return EditorLensLineBackground(editor.markupModel.addRangeHighlighter(startOffset, endOffset, layer, severity.lineAttributes, LINES_IN_RANGE))
+			return EditorLensLineBackground(editor.markupModel.addRangeHighlighter(startOffset, endOffset, layer, attributes, LINES_IN_RANGE))
 		}
 		
 		private fun getHighlightLayer(severity: LensSeverity): Int {
 			return HighlighterLayer.CARET_ROW - 100 - severity.ordinal
 		}
+		
+		private fun getAttributes(editor: Editor, startOffset: Int, endOffset: Int, severity: LensSeverity): TextAttributes? {
+			return if (editor.foldingModel.let { it.isOffsetCollapsed(startOffset) || it.isOffsetCollapsed(endOffset) })
+				null
+			else
+				severity.getLineAttributes(ColorMode.getFromEditor(editor))
+		}
 	}
 }

src/main/kotlin/com/chylex/intellij/inspectionlens/editor/lens/IntentionsPopup.kt

@@ -0,0 +1,36 @@
+package com.chylex.intellij.inspectionlens.editor.lens
+
+import com.intellij.codeInsight.daemon.impl.IntentionsUI
+import com.intellij.codeInsight.hint.HintManager
+import com.intellij.codeInsight.intention.impl.ShowIntentionActionsHandler
+import com.intellij.lang.LangBundle
+import com.intellij.openapi.editor.Editor
+import com.intellij.openapi.project.Project
+import com.intellij.psi.PsiDocumentManager
+import com.intellij.psi.PsiFile
+import com.intellij.psi.util.PsiUtilBase
+
+internal object IntentionsPopup {
+	fun show(editor: Editor) {
+		if (!tryShow(editor)) {
+			HintManager.getInstance().showInformationHint(editor, LangBundle.message("hint.text.no.context.actions.available.at.this.location"))
+		}
+	}
+	
+	private fun tryShow(editor: Editor): Boolean {
+		val project = editor.project ?: return false
+		val file = PsiUtilBase.getPsiFileInEditor(editor, project) ?: return false
+		
+		PsiDocumentManager.getInstance(project).commitAllDocuments()
+		IntentionsUI.getInstance(project).hide()
+		
+		HANDLER.showIntentionHint(project, editor, file, showFeedbackOnEmptyMenu = true)
+		return true
+	}
+	
+	private val HANDLER = object : ShowIntentionActionsHandler() {
+		public override fun showIntentionHint(project: Project, editor: Editor, file: PsiFile, showFeedbackOnEmptyMenu: Boolean) {
+			super.showIntentionHint(project, editor, file, showFeedbackOnEmptyMenu)
+		}
+	}
+}

src/main/kotlin/com/chylex/intellij/inspectionlens/editor/lens/LensRenderer.kt

@@ -3,61 +3,183 @@ package com.chylex.intellij.inspectionlens.editor.lens
 import com.chylex.intellij.inspectionlens.settings.LensSettingsState
 import com.intellij.codeInsight.daemon.impl.HighlightInfo
 import com.intellij.codeInsight.daemon.impl.HintRenderer
+import com.intellij.codeInsight.hints.presentation.InputHandler
 import com.intellij.openapi.editor.Editor
 import com.intellij.openapi.editor.Inlay
+import com.intellij.openapi.editor.ScrollType
+import com.intellij.openapi.editor.colors.EditorFontType
+import com.intellij.openapi.editor.ex.EditorEx
+import com.intellij.openapi.editor.impl.EditorImpl
 import com.intellij.openapi.editor.markup.TextAttributes
 import com.intellij.openapi.util.text.StringUtil
+import com.intellij.ui.paint.EffectPainter
+import java.awt.Cursor
 import java.awt.Graphics
+import java.awt.Graphics2D
+import java.awt.Point
 import java.awt.Rectangle
+import java.awt.event.MouseEvent
+import java.util.regex.Pattern
+import javax.swing.SwingUtilities
 
 /**
  * Renders the text of an inspection lens.
  */
-class LensRenderer(info: HighlightInfo, settings: LensSettingsState) : HintRenderer(null) {
+class LensRenderer(private var info: HighlightInfo, settings: LensSettingsState) : HintRenderer(null), InputHandler {
 	private val useEditorFont = settings.useEditorFont
+	private lateinit var inlay: Inlay<*>
 	private lateinit var severity: LensSeverity
+	private var extraRightPadding = 0
+	private var hovered = false
 	
 	init {
 		setPropertiesFrom(info)
 	}
 	
+	fun setInlay(inlay: Inlay<*>) {
+		check(!this::inlay.isInitialized) { "Inlay already set" }
+		this.inlay = inlay
+	}
+	
 	fun setPropertiesFrom(info: HighlightInfo) {
-		text = getValidDescriptionText(info.description)
+		this.info = info
+		val description = getValidDescriptionText(info.description)
+		
+		text = description
 		severity = LensSeverity.from(info.severity)
+		extraRightPadding = if (description.lastOrNull() == '.') 2 else 0
 	}
 	
 	override fun paint(inlay: Inlay<*>, g: Graphics, r: Rectangle, textAttributes: TextAttributes) {
 		fixBaselineForTextRendering(r)
 		super.paint(inlay, g, r, textAttributes)
+		
+		if (hovered) {
+			paintHoverEffect(inlay, g, r)
+		}
+	}
+	
+	private fun paintHoverEffect(inlay: Inlay<*>, g: Graphics, r: Rectangle) {
+		val editor = inlay.editor
+		if (editor !is EditorImpl) {
+			return
+		}
+		
+		val font = editor.colorsScheme.getFont(EditorFontType.PLAIN)
+		val x = r.x + TEXT_HORIZONTAL_PADDING
+		val y = r.y + editor.ascent + 1
+		val w = inlay.widthInPixels - UNDERLINE_WIDTH_REDUCTION - extraRightPadding
+		val h = editor.descent
+		
+		g.color = getTextAttributes(editor).foregroundColor
+		EffectPainter.LINE_UNDERSCORE.paint(g as Graphics2D, x, y, w, h, font)
 	}
 	
 	override fun getTextAttributes(editor: Editor): TextAttributes {
-		return severity.textAttributes
+		return severity.getTextAttributes(ColorMode.getFromEditor(editor))
 	}
 	
 	override fun useEditorFont(): Boolean {
 		return useEditorFont
 	}
 	
+	override fun mouseMoved(event: MouseEvent, translated: Point) {
+		setHovered(isHoveringText(translated))
+	}
+	
+	override fun mouseExited() {
+		setHovered(false)
+	}
+	
+	private fun setHovered(hovered: Boolean) {
+		if (this.hovered == hovered) {
+			return
+		}
+		
+		this.hovered = hovered
+		
+		val editor = inlay.editor
+		if (editor is EditorEx) {
+			val cursor = if (hovered) Cursor.getPredefinedCursor(Cursor.HAND_CURSOR) else null
+			editor.setCustomCursor(this::class.java, cursor)
+		}
+		
+		inlay.repaint()
+	}
+	
+	override fun mousePressed(event: MouseEvent, translated: Point) {
+		if (!isHoveringText(translated)) {
+			return
+		}
+		
+		if (SwingUtilities.isLeftMouseButton(event) || SwingUtilities.isMiddleMouseButton(event)) {
+			event.consume()
+			
+			val editor = inlay.editor
+			moveToOffset(editor, info.actualStartOffset)
+			
+			if (SwingUtilities.isLeftMouseButton(event)) {
+				IntentionsPopup.show(editor)
+			}
+		}
+	}
+	
+	private fun isHoveringText(point: Point): Boolean {
+		return point.x >= HOVER_HORIZONTAL_PADDING
+			&& point.y >= 4
+			&& point.x < inlay.widthInPixels - HOVER_HORIZONTAL_PADDING - extraRightPadding
+			&& point.y < inlay.heightInPixels - 1
+	}
+	
 	private companion object {
+		/**
+		 * [HintRenderer.paintHint] renders padding around text, but not around effects.
+		 */
+		private const val TEXT_HORIZONTAL_PADDING = 7
+		private const val HOVER_HORIZONTAL_PADDING = TEXT_HORIZONTAL_PADDING - 2
+		private const val UNDERLINE_WIDTH_REDUCTION = (TEXT_HORIZONTAL_PADDING * 2) - 1
+		
+		private const val MAX_DESCRIPTION_LENGTH = 120
+		
+		/**
+		 * Kotlin compiler inspections have an `[UPPERCASE_TAG]` at the beginning.
+		 */
+		private val UPPERCASE_TAG_REGEX = Pattern.compile("^\\[[A-Z_]+] ")
+		
 		private fun getValidDescriptionText(text: String?): String {
-			return if (text.isNullOrBlank()) " " else addMissingPeriod(unescapeHtmlEntities(text))
+			return if (text.isNullOrBlank()) " " else addEllipsisOrMissingPeriod(unescapeHtmlEntities(stripUppercaseTag(text)))
 		}
 		
-		private fun unescapeHtmlEntities(potentialHtml: String): String {
-			return potentialHtml.ifContains('&', StringUtil::unescapeXmlEntities)
+		private fun stripUppercaseTag(text: String): String {
+			if (text.startsWith('[')) {
+				val matcher = UPPERCASE_TAG_REGEX.matcher(text)
+				if (matcher.find()) {
+					return text.substring(matcher.end())
+				}
+			}
+			
+			return text
 		}
 		
-		private fun addMissingPeriod(text: String): String {
-			return if (text.endsWith('.')) text else "$text."
+		private fun unescapeHtmlEntities(text: String): String {
+			return if (text.contains('&')) StringUtil.unescapeXmlEntities(text) else text
 		}
 		
-		private inline fun String.ifContains(charToTest: Char, action: (String) -> String): String {
-			return if (this.contains(charToTest)) action(this) else this
+		private fun addEllipsisOrMissingPeriod(text: String): String {
+			return when {
+				text.length > MAX_DESCRIPTION_LENGTH -> text.take(MAX_DESCRIPTION_LENGTH).trimEnd { it.isWhitespace() || it == '.' } + "…"
+				!text.endsWith('.')                  -> "$text."
+				else                                 -> text
+			}
 		}
 		
 		private fun fixBaselineForTextRendering(rect: Rectangle) {
 			rect.y += 1
 		}
+		
+		private fun moveToOffset(editor: Editor, offset: Int) {
+			editor.caretModel.moveToOffset(offset)
+			editor.scrollingModel.scrollToCaret(ScrollType.MAKE_VISIBLE)
+		}
 	}
 }

src/main/kotlin/com/chylex/intellij/inspectionlens/editor/lens/LensSeverity.kt

@@ -2,19 +2,20 @@ package com.chylex.intellij.inspectionlens.editor.lens
 
 import com.chylex.intellij.inspectionlens.InspectionLens
 import com.chylex.intellij.inspectionlens.compatibility.SpellCheckerSupport
+import com.chylex.intellij.inspectionlens.editor.lens.ColorMode.Companion.createColorAttributes
 import com.intellij.lang.annotation.HighlightSeverity
 import com.intellij.ui.ColorUtil
 import com.intellij.ui.ColorUtil.toAlpha
-import com.intellij.ui.JBColor
 import java.awt.Color
 import java.awt.Font
 import java.util.Collections
+import java.util.EnumMap
 
 /**
  * Determines properties of inspection lenses based on severity.
  */
 @Suppress("UseJBColor", "InspectionUsingGrayColors")
-enum class LensSeverity(baseColor: Color, lightThemeDarkening: Int, darkThemeBrightening: Int) {
+enum class LensSeverity(private val baseColor: Color, private val lightThemeDarkening: Int, private val darkThemeBrightening: Int) {
 	ERROR          (Color(158,  41,  39), lightThemeDarkening = 2, darkThemeBrightening = 4),
 	WARNING        (Color(190, 145,  23), lightThemeDarkening = 5, darkThemeBrightening = 1),
 	WEAK_WARNING   (Color(117, 109,  86), lightThemeDarkening = 4, darkThemeBrightening = 4),
@@ -23,18 +24,37 @@ enum class LensSeverity(baseColor: Color, lightThemeDarkening: Int, darkThemeBri
 	TYPO           (Color( 73, 156,  84), lightThemeDarkening = 4, darkThemeBrightening = 1),
 	OTHER          (Color(128, 128, 128), lightThemeDarkening = 2, darkThemeBrightening = 2);
 	
-	val textAttributes: LensSeverityTextAttributes
-	val lineAttributes: LensSeverityTextAttributes
+	private lateinit var textAttributes: EnumMap<ColorMode, LensSeverityTextAttributes>
+	private lateinit var lineAttributes: EnumMap<ColorMode, LensSeverityTextAttributes>
 	
 	init {
-		val lightThemeColor = ColorUtil.saturate(ColorUtil.darker(baseColor, lightThemeDarkening), 1)
-		val darkThemeColor = ColorUtil.desaturate(ColorUtil.brighter(baseColor, darkThemeBrightening), 2)
+		refreshColors()
+	}
 	
-		val textColor = JBColor(lightThemeColor, darkThemeColor)
-		val lineColor = JBColor(toAlpha(lightThemeColor, 10), toAlpha(darkThemeColor, 13))
+	internal fun refreshColors() {
+		val theme = if (ColorGenerator.useGenerator) {
+			ColorGenerator.generate(name, baseColor)
+		}
+		else {
+			val lightThemeTextColor = ColorUtil.saturate(ColorUtil.darker(baseColor, lightThemeDarkening), 1)
+			val darkThemeTextColor = ColorUtil.desaturate(ColorUtil.brighter(baseColor, darkThemeBrightening), 2)
 			
-		textAttributes = LensSeverityTextAttributes(foregroundColor = textColor, fontStyle = Font.ITALIC)
-		lineAttributes = LensSeverityTextAttributes(backgroundColor = lineColor)
+			val lightThemeLineColor = toAlpha(lightThemeTextColor, 10)
+			val darkThemeLineColor = toAlpha(darkThemeTextColor, 13)
+			
+			ColorGenerator.Theme(lightThemeTextColor, lightThemeLineColor, darkThemeTextColor, darkThemeLineColor)
+		}
+		
+		textAttributes = createColorAttributes(theme.lightThemeTextColor, theme.darkThemeTextColor) { LensSeverityTextAttributes(foregroundColor = it, fontStyle = Font.ITALIC) }
+		lineAttributes = createColorAttributes(theme.lightThemeLineColor, theme.darkThemeLineColor) { LensSeverityTextAttributes(backgroundColor = it) }
+	}
+	
+	internal fun getTextAttributes(colorMode: ColorMode): LensSeverityTextAttributes {
+		return textAttributes.getValue(colorMode)
+	}
+	
+	internal fun getLineAttributes(colorMode: ColorMode): LensSeverityTextAttributes {
+		return lineAttributes.getValue(colorMode)
 	}
 	
 	companion object {

src/main/resources/META-INF/plugin.xml

@@ -8,10 +8,21 @@
     <br><br>
     By default, the plugin shows <b>Errors</b>, <b>Warnings</b>, <b>Weak Warnings</b>, <b>Server Problems</b>, <b>Grammar Errors</b>, <b>Typos</b>, and other inspections with a high enough severity level. Configure visible severities in <b>Settings | Tools | Inspection Lens</a>.
     <br><br>
+    Left-click an inspection to show quick fixes. Middle-click an inspection to navigate to the relevant code in the editor. 
+    <br><br>
     Inspired by <a href="https://marketplace.visualstudio.com/items?itemName=usernamehw.errorlens">Error Lens</a> for VS Code, and <a href="https://plugins.jetbrains.com/plugin/17302-inlineerror">Inline Error</a> for IntelliJ Platform.
   ]]></description>
   
   <change-notes><![CDATA[
+    <b>Version 1.5</b>
+    <ul>
+      <li>Added possibility to left-click an inspection to show quick fixes.</li>
+      <li>Added possibility to middle-click an inspection to navigate to relevant code in the editor.</li>
+      <li>Added option to use UI font instead of editor font.</li>
+      <li>Long inspection descriptions are now truncated to 120 characters.</li>
+      <li>Improved descriptions of Kotlin compiler inspections.</li>
+      <li>Fixed visual artifacts in Rendered Doc comments.</li>
+    </ul>
     <b>Version 1.4.1</b>
     <ul>
       <li>Fixed warnings in usage of IntelliJ SDK.</li>
@@ -81,4 +92,10 @@
   <projectListeners>
     <listener class="com.chylex.intellij.inspectionlens.InspectionLensFileOpenedListener" topic="com.intellij.openapi.fileEditor.FileOpenedSyncListener" />
   </projectListeners>
+  
+  <actions>
+    <action id="com.chylex.intellij.inspectionlens.debug.ShowColorEditorAction" class="com.chylex.intellij.inspectionlens.debug.ShowColorEditorAction" text="Inspection Lens - Show Color Editor">
+      <add-to-group group-id="ToolsMenu" anchor="last" />
+    </action>
+  </actions>
 </idea-plugin>