Implemented 'Field to block' action

actions/src/main/java/com/itsaky/androidide/actions/ActionItem.kt

@@ -54,7 +54,7 @@ interface ActionItem {
      *
      * @param data The data containing various information about the event.
      */
-    fun postExec(data: ActionData, result: Any) = Any()
+    fun postExec(data: ActionData, result: Any) = Unit
 
     fun getShowAsActionFlags(data: ActionData): Int = -1
 

lsp/java/src/main/java/com/itsaky/lsp/java/actions/DiagnosticsCodeActionProvider.java

@@ -126,8 +126,6 @@ public class DiagnosticsCodeActionProvider implements ActionProvider {
     private List<Pair<String, Rewrite>> codeActionForDiagnostic(
             CompilerProvider compiler, CompileTask task, Path file, @NonNull DiagnosticItem d) {
         switch (d.getCode()) {
-            case "unused_local":
-                return handleUnusedLocal(task, file, d);
             case "unused_field":
                 return handleUnusedField(task, file, d);
             case "unused_class":

lsp/java/src/main/java/com/itsaky/lsp/java/actions/FieldToBlockAction.kt

@@ -0,0 +1,78 @@
+/*
+ *  This file is part of AndroidIDE.
+ *
+ *  AndroidIDE is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  AndroidIDE is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *   along with AndroidIDE.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.itsaky.lsp.java.actions
+
+import com.itsaky.androidide.actions.ActionData
+import com.itsaky.androidide.utils.Logger
+import com.itsaky.lsp.java.JavaLanguageServer
+import com.itsaky.lsp.java.rewrite.ConvertFieldToBlock
+import com.itsaky.lsp.java.utils.CodeActionUtils.findPosition
+import com.itsaky.lsp.models.DiagnosticItem
+import java.io.File
+
+/** @author Akash Yadav */
+class FieldToBlockAction : BaseCodeAction() {
+
+    override val id: String = "lsp_java_fieldToBlock"
+    override var label: String = "Convert to block"
+    private val diagnosticCode = "unused_field"
+    private val log = Logger.newInstance(javaClass.simpleName)
+
+    override fun prepare(data: ActionData) {
+        super.prepare(data)
+
+        if (!visible) {
+            return
+        }
+
+        if (!hasRequiredData(
+            data, JavaLanguageServer::class.java, DiagnosticItem::class.java, File::class.java)) {
+            markInvisible()
+            return
+        }
+
+        val diagnostic = data.get(DiagnosticItem::class.java)!!
+        if (diagnosticCode != diagnostic.code) {
+            markInvisible()
+            return
+        }
+    }
+
+    override fun execAction(data: ActionData): Any {
+        val server = data[JavaLanguageServer::class.java]!!
+        val diagnostic = data[DiagnosticItem::class.java]!!
+        val file = requirePath(data)
+
+        return server.compiler.compile(file).get {
+            ConvertFieldToBlock(file, findPosition(it, diagnostic.range.start))
+        }
+    }
+
+    override fun postExec(data: ActionData, result: Any) {
+        if (result !is ConvertFieldToBlock) {
+            log.warn("Unable to convert field to block")
+            return
+        }
+
+        val server = data[JavaLanguageServer::class.java]!!
+        val client = server.client!!
+        val file = requireFile(data)
+
+        client.performCodeAction(file, result.asCodeActions(server.compiler, label))
+    }
+}