fix(gui): improve code block rendering and parsing #51

The commit addresses several issues related to code block rendering and parsing in the GUI. It fixes a bug where the foreground color of code blocks was not being set correctly and ensures that the code block component is added to the center panel. Additionally, the commit enhances the code parsing utility to correctly handle empty code blocks within markdown content, treating them as markdown instead of code.

src/main/kotlin/cc/unitmesh/devti/gui/chat/AutoDevInputSection.kt

@@ -4,6 +4,7 @@ import cc.unitmesh.devti.AutoDevBundle
 import cc.unitmesh.devti.AutoDevIcons
 import cc.unitmesh.devti.counit.configurable.customAgentSetting
 import cc.unitmesh.devti.counit.model.CustomAgentConfig
+import cc.unitmesh.devti.counit.model.CustomAgentState
 import cc.unitmesh.devti.llms.tokenizer.Tokenizer
 import cc.unitmesh.devti.llms.tokenizer.TokenizerImpl
 import cc.unitmesh.devti.settings.AutoDevSettingsState
@@ -222,6 +223,7 @@ class AutoDevInputSection(private val project: Project, val disposable: Disposab
     }
 
     fun resetAgent() {
+        (customRag.selectedItem as CustomAgentConfig).state = CustomAgentState.START
         customRag.selectedItem = defaultRag
     }
 

src/main/kotlin/cc/unitmesh/devti/gui/chat/MessageView.kt

@@ -98,8 +98,10 @@ class MessageView(private val message: String, val role: ChatRole, private val d
             }
 
             blockView.initialize()
-            blockView.getComponent()?.setForeground(JBUI.CurrentTheme.Label.foreground())
-            blockView.getComponent()?.let { component -> centerPanel.add(component) }
+            val component = blockView.getComponent() ?: return@forEach
+
+            component.setForeground(JBUI.CurrentTheme.Label.foreground())
+            centerPanel.add(component)
         }
     }
 

src/main/kotlin/cc/unitmesh/devti/util/parser/CodeUtil.kt

@@ -6,7 +6,8 @@ class Code(val language: Language, val text: String, val isComplete: Boolean) {
     companion object {
         fun parse(content: String): Code {
             val regex = Regex("```([\\w#+]*)")
-            val lines = content.lines()
+            // convert content \\n to \n
+            val lines = content.replace("\\n", "\n").lines()
 
             var codeStarted = false
             var codeClosed = false
@@ -48,6 +49,12 @@ class Code(val language: Language, val text: String, val isComplete: Boolean) {
 
             val trimmedCode = codeBuilder.substring(startIndex, endIndex + 1).toString()
             val language = findLanguage(languageId ?: "")
+
+            // if content is not empty, but code is empty, then it's a markdown
+            if (trimmedCode.isEmpty()) {
+                return Code(findLanguage("markdown"), content.replace("\\n", "\n"), codeClosed)
+            }
+
             return Code(language, trimmedCode, codeClosed)
         }
 

src/main/kotlin/com/intellij/temporary/gui/block/CodeBlockView.kt

@@ -38,7 +38,7 @@ import javax.swing.JComponent
 class CodeBlockView(
     private val block: CodeBlock,
     private val project: Project,
-    private val disposable: Disposable
+    private val disposable: Disposable,
 ) :
     MessageBlockView {
     private var editorInfo: CodePartEditorInfo? = null
@@ -103,7 +103,7 @@ class CodeBlockView(
             project: Project,
             file: LightVirtualFile,
             document: Document,
-            disposable: Disposable
+            disposable: Disposable,
         ): EditorEx {
             val editor: EditorEx = ReadAction.compute<EditorEx, Throwable> {
                 EditorFactory.getInstance()
@@ -156,7 +156,7 @@ class CodeBlockView(
             graphProperty: GraphProperty<String>,
             disposable: Disposable,
             language: Language,
-            message: CompletableMessage
+            message: CompletableMessage,
         ): CodePartEditorInfo {
             val forceFoldEditorByDefault = message.getRole() === ChatRole.User
             val createCodeViewerFile = createCodeViewerFile(language, graphProperty.get())

src/main/kotlin/com/intellij/temporary/gui/block/MessageBlock.kt

@@ -69,7 +69,7 @@ class CodeBlock(private val msg: CompletableMessage) : AbstractMessageBlock(msg)
 
     init {
         val language = Language.ANY
-        this.code = Code(language, "", false)
+        this.code = Code(language, msg.text, false)
     }
 
     override fun onContentChanged(content: String) {

src/test/kotlin/cc/unitmesh/devti/parser/CodeUtilTest.kt

@@ -21,13 +21,15 @@ class CodeUtilTest {
         val code = Code.parse(markdown)
 
 //        assertEquals(code.language.id, "java")
-        assertEquals(code.text, """
+        assertEquals(
+            code.text, """
             |public class HelloWorld {
             |    public static void main(String[] args) {
             |        System.out.println("Hello, World");
             |    }
             |}
-        """.trimMargin())
+        """.trimMargin()
+        )
         assertTrue(code.isComplete)
     }
 
@@ -41,11 +43,20 @@ class CodeUtilTest {
         """.trimMargin()
 
         val code = Code.parse(markdown)
-        assertEquals(code.text, """
+        assertEquals(
+            code.text, """
             |public class HelloWorld {
             |    public static void main(String[] args) {
             |        System.out.println("Hello, World");
-        """.trimMargin())
+        """.trimMargin()
+        )
         assertTrue(!code.isComplete)
     }
+
+    @Test
+    fun should_handle_pure_markdown_content() {
+        val content = "```markdown\\nGET /wp/v2/posts\\n```"
+        val code = Code.parse(content)
+        assertEquals(code.text, "GET /wp/v2/posts")
+    }
 }