Don't load if no shadcn, error notif on config parse

src/main/kotlin/com/github/warningimhack3r/intellijshadcnplugin/backend/sources/Source.kt

@@ -29,7 +29,11 @@ abstract class Source<C : Config>(val project: Project, private val serializer:
     // Utility methods
     protected fun getLocalConfig(): C {
         return FileManager(project).getFileContentsAtPath("components.json")?.let {
-            Json.decodeFromString(serializer, it)
+            try {
+                Json.decodeFromString(serializer, it)
+            } catch (e: Exception) {
+                throw UnparseableConfigException(project, "Unable to parse components.json", e)
+            }
         } ?: throw NoSuchFileException("components.json not found")
     }
 

src/main/kotlin/com/github/warningimhack3r/intellijshadcnplugin/backend/sources/UnparseableConfigException.kt

@@ -0,0 +1,19 @@
+package com.github.warningimhack3r.intellijshadcnplugin.backend.sources
+
+import com.github.warningimhack3r.intellijshadcnplugin.notifications.NotificationManager
+import com.intellij.notification.NotificationType
+import com.intellij.openapi.project.Project
+
+class UnparseableConfigException(
+    project: Project,
+    message: String? = null,
+    cause: Throwable? = null
+) : Exception(message, cause) {
+    init {
+        NotificationManager(project).sendNotification(
+            "Unparseable configuration file",
+            "Your <code>components.json</code> file could not be parsed.<br />Please check that it is a valid JSON and that it contains the correct fields.",
+            NotificationType.ERROR
+        )
+    }
+}

src/main/kotlin/com/github/warningimhack3r/intellijshadcnplugin/ui/ISPToolWindow.kt

@@ -1,5 +1,6 @@
 package com.github.warningimhack3r.intellijshadcnplugin.ui
 
+import com.github.warningimhack3r.intellijshadcnplugin.backend.SourceScanner
 import com.github.warningimhack3r.intellijshadcnplugin.backend.helpers.FileManager
 import com.intellij.openapi.application.ApplicationManager
 import com.intellij.openapi.application.runReadAction
@@ -15,7 +16,7 @@ import kotlinx.coroutines.async
 import kotlinx.coroutines.future.asCompletableFuture
 import javax.swing.SwingConstants
 
-class ISPToolWindow: ToolWindowFactory {
+class ISPToolWindow : ToolWindowFactory {
     override fun init(toolWindow: ToolWindow) {
         ApplicationManager.getApplication().invokeLater {
             toolWindow.setIcon(ISPIcons.logo)
@@ -27,11 +28,15 @@ class ISPToolWindow: ToolWindowFactory {
         with(toolWindow.contentManager) {
             addContent(factory.createContent(SimpleToolWindowPanel(true).apply {
                 GlobalScope.async {
-                    return@async runReadAction {
-                        FileManager(project).getVirtualFilesByName("package.json").size
-                    }
-                }.asCompletableFuture().thenApplyAsync { count ->
-                    if (count > 1) {
+                    return@async Pair(runReadAction {
+                        SourceScanner.findShadcnImplementation(project)
+                    } != null, runReadAction {
+                        FileManager(project).getVirtualFilesByName("package.json")
+                    }.size)
+                }.asCompletableFuture().thenApplyAsync { (hasShadcn, count) ->
+                    if (!hasShadcn) {
+                        add(JBLabel("No shadcn/ui implementation detected.", SwingConstants.CENTER))
+                    } else if (count > 1) {
                         add(JBLabel("Multiple projects detected, not supported yet.", SwingConstants.CENTER))
                     } else {
                         add(ISPWindowContents(project).panel())