[cli-repl] Optimize System.in to send "change indicator" message only when readLine is called

compiler/cli/src/org/jetbrains/kotlin/cli/jvm/repl/messages/ReplSystemInWrapper.kt

@@ -25,30 +25,30 @@ public class ReplSystemInWrapper(
 ) : InputStream() {
     private var isXmlIncomplete = true
     private var isLastScriptByteProcessed = false
+    private var isReadLineStartSent = false
     private var byteBuilder = ByteArrayOutputStream()
     private var curBytePos = 0
     private var inputByteArray = byteArrayOf()
 
-    private val isReachBufferEnd: Boolean
+    private val isAtBufferEnd: Boolean
         get() = curBytePos == inputByteArray.size()
 
     var isReplScriptExecuting = false
-        set(value) {
-            if (value)
-                replWriter.printlnReadLineStart()
-            else
-                replWriter.printlnReadLineEnd()
-
-            $isReplScriptExecuting = value
-        }
 
     override fun read(): Int {
         if (isLastScriptByteProcessed && isReplScriptExecuting) {
             isLastScriptByteProcessed = false
+            isReadLineStartSent = false
+            replWriter.printlnReadLineEnd()
             return -1
         }
 
         while (isXmlIncomplete) {
+            if (isReplScriptExecuting && !isReadLineStartSent) {
+                replWriter.printlnReadLineStart()
+                isReadLineStartSent = true
+            }
+
             byteBuilder.write(stdin.read())
 
             if (byteBuilder.toString().endsWith(END_LINE)) {
@@ -77,7 +77,7 @@ public class ReplSystemInWrapper(
     }
 
     private fun resetBufferIfNeeded() {
-        if (isReachBufferEnd) {
+        if (isAtBufferEnd) {
             isXmlIncomplete = true
             byteBuilder = ByteArrayOutputStream()
             curBytePos = 0

idea/idea-repl/src/org/jetbrains/kotlin/console/KotlinConsoleRunner.kt

@@ -18,14 +18,25 @@ package org.jetbrains.kotlin.console
 
 import com.intellij.execution.Executor
 import com.intellij.execution.configurations.GeneralCommandLine
-import com.intellij.execution.console.*
-import com.intellij.execution.process.*
+import com.intellij.execution.console.ConsoleExecuteAction
+import com.intellij.execution.console.LanguageConsoleBuilder
+import com.intellij.execution.console.LanguageConsoleView
+import com.intellij.execution.console.ProcessBackedConsoleExecuteActionHandler
+import com.intellij.execution.process.OSProcessHandler
+import com.intellij.execution.process.ProcessAdapter
+import com.intellij.execution.process.ProcessEvent
 import com.intellij.execution.runners.AbstractConsoleRunnerWithHistory
 import com.intellij.execution.ui.RunContentDescriptor
-import com.intellij.openapi.actionSystem.*
+import com.intellij.openapi.actionSystem.AnAction
+import com.intellij.openapi.actionSystem.CommonShortcuts
+import com.intellij.openapi.actionSystem.DefaultActionGroup
+import com.intellij.openapi.command.WriteCommandAction
 import com.intellij.openapi.editor.colors.EditorColors
 import com.intellij.openapi.editor.ex.EditorEx
-import com.intellij.openapi.editor.markup.*
+import com.intellij.openapi.editor.markup.HighlighterLayer
+import com.intellij.openapi.editor.markup.HighlighterTargetArea
+import com.intellij.openapi.editor.markup.RangeHighlighter
+import com.intellij.openapi.editor.markup.TextAttributes
 import com.intellij.openapi.module.Module
 import com.intellij.openapi.project.Project
 import com.intellij.openapi.util.Disposer
@@ -172,7 +183,7 @@ public class KotlinConsoleRunner(
         return indicatorHighlighter apply { gutterIconRenderer = indicator }
     }
 
-    fun changeConsoleEditorIndicator(newIconWithTooltip: IconWithTooltip) {
+    fun changeConsoleEditorIndicator(newIconWithTooltip: IconWithTooltip) = WriteCommandAction.runWriteCommandAction(project) {
         consoleEditorHighlighter.gutterIconRenderer = KotlinConsoleIndicatorRenderer(newIconWithTooltip)
     }
 

idea/idea-repl/src/org/jetbrains/kotlin/console/highlight/KotlinHistoryHighlighter.kt

@@ -17,7 +17,6 @@
 package org.jetbrains.kotlin.console.highlight
 
 import com.intellij.execution.console.LanguageConsoleImpl
-import com.intellij.openapi.command.WriteCommandAction
 import com.intellij.openapi.editor.ex.EditorEx
 import com.intellij.openapi.editor.ex.util.EditorUtil
 import com.intellij.openapi.editor.markup.HighlighterLayer
@@ -32,12 +31,10 @@ public class KotlinHistoryHighlighter(private val runner: KotlinConsoleRunner )
 
     var isReadLineMode: Boolean = false
         set(value) {
-            WriteCommandAction.runWriteCommandAction(runner.project) {
-                if (value)
-                    runner.changeConsoleEditorIndicator(ReplIcons.EDITOR_READLINE_INDICATOR)
-                else
-                    runner.changeConsoleEditorIndicator(ReplIcons.EDITOR_INDICATOR)
-            }
+            if (value)
+                runner.changeConsoleEditorIndicator(ReplIcons.EDITOR_READLINE_INDICATOR)
+            else
+                runner.changeConsoleEditorIndicator(ReplIcons.EDITOR_INDICATOR)
 
             $isReadLineMode = value
         }