fix: add initial K2-backed scope code completions

Signed-off-by: Akash Yadav <akashyadav@appdevforall.org>

Author: itsaky-adfa

lsp/java/src/main/java/com/itsaky/androidide/lsp/java/edits/BaseJavaEditHandler.kt

@@ -30,11 +30,11 @@ import io.github.rosemoe.sora.widget.CodeEditor
  */
 open class BaseJavaEditHandler : DefaultEditHandler() {
 
-  override fun executeCommand(editor: CodeEditor, command: Command?) {
-    if (editor is ILspEditor) {
-      editor.executeCommand(command)
-      return
-    }
-    super.executeCommand(editor, command)
-  }
+	override fun executeCommand(editor: CodeEditor, command: Command?) {
+		if (editor is ILspEditor) {
+			editor.executeCommand(command)
+			return
+		}
+		super.executeCommand(editor, command)
+	}
 }

lsp/kotlin/build.gradle.kts

@@ -38,6 +38,7 @@ dependencies {
 
 	implementation(projects.lsp.api)
 	implementation(projects.lsp.models)
+	implementation(projects.editorApi)
 	implementation(projects.eventbusEvents)
 	implementation(projects.subprojects.kotlinAnalysisApi)
 	implementation(projects.shared)

lsp/kotlin/src/main/java/com/itsaky/androidide/lsp/kotlin/KotlinLanguageServer.kt

@@ -29,6 +29,7 @@ import com.itsaky.androidide.lsp.api.ILanguageServer
 import com.itsaky.androidide.lsp.api.IServerSettings
 import com.itsaky.androidide.lsp.kotlin.compiler.Compiler
 import com.itsaky.androidide.lsp.kotlin.compiler.KotlinProjectModel
+import com.itsaky.androidide.lsp.kotlin.completion.complete
 import com.itsaky.androidide.lsp.kotlin.diagnostic.collectDiagnosticsFor
 import com.itsaky.androidide.lsp.models.CompletionParams
 import com.itsaky.androidide.lsp.models.CompletionResult
@@ -160,7 +161,14 @@ class KotlinLanguageServer : ILanguageServer {
 	}
 
 	override fun complete(params: CompletionParams?): CompletionResult {
-		return CompletionResult.EMPTY
+		if (params == null) {
+			logger.warn("Cannot complete for null params")
+			return CompletionResult.EMPTY
+		}
+
+		logger.debug("complete(position={}, file={})", params.position, params.file)
+		return compiler?.compilationEnvironmentFor(params.file)?.complete(params)
+			?: CompletionResult.EMPTY
 	}
 
 	override suspend fun findReferences(params: ReferenceParams): ReferenceResult {
@@ -268,7 +276,6 @@ class KotlinLanguageServer : ILanguageServer {
 
 		compiler?.compilationEnvironmentFor(event.changedFile)?.apply {
 			val content = FileManager.getDocumentContents(event.changedFile)
-			logger.info("Notifying KtFileManager for file {} with contents {}", event.changedFile, content)
 			fileManager.onFileContentChanged(event.changedFile, content)
 		}
 

lsp/kotlin/src/main/java/com/itsaky/androidide/lsp/kotlin/completion/BaseKotlinEditHandler.kt

@@ -0,0 +1,23 @@
+package com.itsaky.androidide.lsp.kotlin.completion
+
+import com.itsaky.androidide.editor.api.ILspEditor
+import com.itsaky.androidide.lsp.edits.DefaultEditHandler
+import com.itsaky.androidide.lsp.models.Command
+import io.github.rosemoe.sora.widget.CodeEditor
+
+/**
+ * Implementation of [DefaultEditHandler] which avoids reflection in
+ * [DefaultEditHandler.executeCommand].
+ *
+ * @author Akash Yadav
+ */
+open class BaseKotlinEditHandler : DefaultEditHandler() {
+
+	override fun executeCommand(editor: CodeEditor, command: Command?) {
+		if (editor is ILspEditor) {
+			editor.executeCommand(command)
+			return
+		}
+		super.executeCommand(editor, command)
+	}
+}

lsp/kotlin/src/main/java/com/itsaky/androidide/lsp/kotlin/completion/CompletionContext.kt

@@ -0,0 +1,17 @@
+package com.itsaky.androidide.lsp.kotlin.completion
+
+/**
+ * The context for the providing code completions in a file.
+ */
+enum class CompletionContext {
+
+	/**
+	 * Scope completions (local variables, parameters, etc.)
+	 */
+	Scope,
+
+	/**
+	 * Member completions (properties, member functions, extension functions, etc.)
+	 */
+	Member,
+}

lsp/kotlin/src/main/java/com/itsaky/androidide/lsp/kotlin/completion/KotlinCompletionItem.kt

@@ -0,0 +1,50 @@
+package com.itsaky.androidide.lsp.kotlin.completion
+
+import com.itsaky.androidide.lsp.edits.IEditHandler
+import com.itsaky.androidide.lsp.models.Command
+import com.itsaky.androidide.lsp.models.CompletionItem
+import com.itsaky.androidide.lsp.models.CompletionItemKind
+import com.itsaky.androidide.lsp.models.ICompletionData
+import com.itsaky.androidide.lsp.models.InsertTextFormat
+import com.itsaky.androidide.lsp.models.MatchLevel
+import com.itsaky.androidide.lsp.models.TextEdit
+
+class KotlinCompletionItem(
+	ideLabel: String,
+	detail: String,
+	insertText: String?,
+	insertTextFormat: InsertTextFormat?,
+	sortText: String?,
+	command: Command?,
+	completionKind: CompletionItemKind,
+	matchLevel: MatchLevel,
+	additionalTextEdits: List<TextEdit>?,
+	data: ICompletionData?,
+	editHandler: IEditHandler = BaseKotlinEditHandler()
+) : CompletionItem(
+	ideLabel,
+	detail,
+	insertText,
+	insertTextFormat,
+	sortText,
+	command,
+	completionKind,
+	matchLevel,
+	additionalTextEdits,
+	data,
+	editHandler
+) {
+
+	constructor() : this(
+		"", // label
+		"", // detail
+		null, // insertText
+		null, // insertTextFormat
+		null, // sortText
+		null, // command
+		CompletionItemKind.NONE, // kind
+		MatchLevel.NO_MATCH, // match level
+		ArrayList(), // additionalEdits
+		null // data
+	)
+}