Fixes exception when the IDE has no foreground color for given attribute

Resolves #121

Author: Roboroads

CHANGELOG.md

@@ -8,6 +8,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 ### Changes
 - Merged changes from JetBrains plugin template
 - [[#120]](https://github.com/Roboroads/laravel-tinker/issues/120) Changes remote tip text in settings
+### Fixed
+- [[#121]](https://github.com/Roboroads/laravel-tinker/issues/121) Exception when the IDE has no foreground color for given attribute
 ## [2.3.0]
 ### Added
 - [[#112]](https://github.com/Roboroads/laravel-tinker/issues/112) Adds <kbd>Open new console</kbd> and <kbd>Reopen last console</kbd> actions to the tinker output toolwindow.

src/main/kotlin/nl/deschepers/laraveltinker/toolwindow/TinkerOutputToolwindow.kt

@@ -1,6 +1,8 @@
 package nl.deschepers.laraveltinker.toolwindow
 
 import com.intellij.openapi.editor.DefaultLanguageHighlighterColors
+import com.intellij.openapi.editor.HighlighterColors
+import com.intellij.openapi.editor.colors.EditorColorsManager
 import com.intellij.openapi.wm.ToolWindow
 import nl.deschepers.laraveltinker.Strings
 import nl.deschepers.laraveltinker.settings.GlobalSettingsState
@@ -83,7 +85,7 @@ class TinkerOutputToolwindow(private val toolWindow: ToolWindow) {
     }
 
     private fun updateView() {
-        val color = toHex(DefaultLanguageHighlighterColors.LABEL.defaultAttributes.foregroundColor)
+        val color = toHex(HighlighterColors.TEXT.defaultAttributes.foregroundColor ?: Color.BLACK)
         val timeString = if (pluginSettings.showExecutionStarted) Strings.get("lt.started.at", outputTime) else ""
         val highlightedOutput = highlightSyntax("\n" + sanitizeOutput(outputText))
 
@@ -138,10 +140,10 @@ class TinkerOutputToolwindow(private val toolWindow: ToolWindow) {
     }
 
     private fun highlightSyntax(text: String): String {
-        val stringColor = DefaultLanguageHighlighterColors.STRING.defaultAttributes.foregroundColor
-        val numberColor = DefaultLanguageHighlighterColors.NUMBER.defaultAttributes.foregroundColor
+        val stringColor = DefaultLanguageHighlighterColors.STRING.defaultAttributes.foregroundColor ?: Color.BLACK
+        val numberColor = DefaultLanguageHighlighterColors.NUMBER.defaultAttributes.foregroundColor ?: Color.BLACK
         val propColor = DefaultLanguageHighlighterColors.INSTANCE_FIELD.defaultAttributes
-            .foregroundColor
+            .foregroundColor ?: Color.BLACK
 
         val regex = Regex("(.*\n=>)(.*)", RegexOption.DOT_MATCHES_ALL)