Refactor script definition loading error handling

reenable logging of failures
suppress loading from failed contributors

idea/idea-core/src/org/jetbrains/kotlin/idea/core/script/ScriptDefinitionsManager.kt

@@ -69,6 +69,8 @@ class ScriptDefinitionsManager(private val project: Project) : LazyScriptDefinit
     private var definitionsByContributor = mutableMapOf<ScriptDefinitionContributor, List<KotlinScriptDefinition>>()
     private var definitions: List<KotlinScriptDefinition>? = null
 
+    private val failedContributorsHashes = HashSet<Int>()
+
     private val scriptDefinitionsCacheLock = ReentrantReadWriteLock()
     private val scriptDefinitionsCache = SLRUMap<String, KotlinScriptDefinition>(10, 10)
 
@@ -195,13 +197,14 @@ class ScriptDefinitionsManager(private val project: Project) : LazyScriptDefinit
     }
 
     private fun ScriptDefinitionContributor.safeGetDefinitions(): List<KotlinScriptDefinition> {
-        return try {
-            getDefinitions()
+        if (!failedContributorsHashes.contains(this@safeGetDefinitions.hashCode())) try {
+            return getDefinitions()
         } catch (t: Throwable) {
-            // TODO: review exception handling
-            // possibly log, see KT-19276
-            emptyList()
+            // reporting failed loading only once
+            LOG.error("[kts] cannot load script definitions using $this", t)
+            failedContributorsHashes.add(this@safeGetDefinitions.hashCode())
         }
+        return emptyList()
     }
 
     companion object {

idea/idea-gradle/src/org/jetbrains/kotlin/idea/core/script/GradleScriptTemplateProvider.kt

@@ -17,6 +17,7 @@
 package org.jetbrains.kotlin.idea.core.script
 
 import com.intellij.execution.configurations.CommandLineTokenizer
+import com.intellij.openapi.diagnostic.Logger
 import com.intellij.openapi.externalSystem.model.task.ExternalSystemTaskId
 import com.intellij.openapi.externalSystem.model.task.ExternalSystemTaskNotificationListenerAdapter
 import com.intellij.openapi.externalSystem.model.task.ExternalSystemTaskType
@@ -37,6 +38,7 @@ import org.jetbrains.plugins.gradle.settings.GradleProjectSettings
 import org.jetbrains.plugins.gradle.settings.GradleSettingsListener
 import org.jetbrains.plugins.gradle.util.GradleConstants
 import java.io.File
+import java.lang.IllegalStateException
 import java.util.*
 import java.util.concurrent.atomic.AtomicBoolean
 import kotlin.collections.LinkedHashSet
@@ -157,6 +159,10 @@ class GradleScriptDefinitionsContributor(private val project: Project) : ScriptD
     } catch (t: Throwable) {
         // TODO: review exception handling
         failedToLoad.set(true)
+        if (t is IllegalStateException) {
+            Logger.getInstance(GradleScriptDefinitionsContributor::class.java)
+                .info("[kts] error loading gradle script templates: ${t.message}")
+        }
         listOf(ErrorGradleScriptDefinition(t.message))
     }
 
@@ -191,7 +197,7 @@ class GradleScriptDefinitionsContributor(private val project: Project) : ScriptD
         if (gradleSettings.getLinkedProjectsSettings().isEmpty()) error("Project '${project.name}' isn't linked with Gradle")
 
         val projectSettings = gradleSettings.getLinkedProjectsSettings().filterIsInstance<GradleProjectSettings>().firstOrNull()
-                ?: error("Project '${project.name}' isn't linked with Gradle")
+            ?: error("Project '${project.name}' isn't linked with Gradle")
 
         val gradleExeSettings = ExternalSystemApiUtil.getExecutionSettings<GradleExecutionSettings>(
             project,