add MapColor preview-color gutter icons

src/main/kotlin/insight/MapColorLineMarkerProvider.kt

@@ -0,0 +1,9 @@
+package com.demonwav.mcdev.insight
+
+import com.intellij.psi.PsiElement
+import java.awt.Color
+import org.jetbrains.uast.UElement
+
+class MapColorLineMarkerProvider : ColorLineMarkerProvider.CommonLineMarkerProvider() {
+    override fun findColor(element:PsiElement): Pair<Color, UElement>? = element.findMapColor()
+}

src/main/kotlin/insight/MapColorUtil.kt

@@ -0,0 +1,27 @@
+package com.demonwav.mcdev.insight
+
+import com.intellij.psi.PsiElement
+import java.awt.Color
+import org.jetbrains.uast.UCallExpression
+import org.jetbrains.uast.UElement
+import org.jetbrains.uast.UIdentifier
+import org.jetbrains.uast.getParentOfType
+import org.jetbrains.uast.toUElementOfType
+
+fun PsiElement.findMapColor(): Pair<Color, UElement>? {
+    val identifier = this.toUElementOfType<UIdentifier>()
+        ?: return null
+
+    val call = identifier.getParentOfType<UCallExpression>()
+        ?: return null
+
+    if (call.resolve()?.containingClass?.qualifiedName != "net.minecraft.world.level.material.MapColor") {
+        return null
+    }
+
+    val params = call.valueArguments
+    val argb = (params.getOrNull(1)?.evaluate() as? Number)?.toInt() ?: return null
+    @Suppress("UseJBColor")
+    return Color(argb, false) to call
+}
+

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

@@ -368,6 +368,8 @@
                                         implementationClass="com.demonwav.mcdev.insight.ColorLineMarkerProvider"/>
         <codeInsight.lineMarkerProvider language=""
                                         implementationClass="com.demonwav.mcdev.insight.PluginLineMarkerProvider"/>
+        <codeInsight.lineMarkerProvider language=""
+                                        implementationClass="com.demonwav.mcdev.insight.MapColorLineMarkerProvider"/>
 
         <!-- Project-independent Annotators-->
         <annotator language="UAST" implementationClass="com.demonwav.mcdev.insight.ListenerEventAnnotator"/>