editing psi task done

courseSection/psi/editPSI/src/Task.kt

@@ -0,0 +1,18 @@
+import com.intellij.openapi.command.WriteCommandAction
+import com.intellij.psi.PsiFile
+import com.intellij.psi.util.PsiTreeUtil
+import org.jetbrains.kotlin.psi.KtNamedFunction
+
+
+fun editFunctionName(psiFile: PsiFile, currentName: String, newName: String) {
+    val project = psiFile.project
+
+    WriteCommandAction.runWriteCommandAction(project) {
+        val functions = PsiTreeUtil.findChildrenOfType(psiFile, KtNamedFunction::class.java)
+        for (function in functions) {
+            if (function.name == currentName) {
+                function.setName(newName)
+            }
+        }
+    }
+}

courseSection/psi/editPSI/task-info.yaml

@@ -0,0 +1,6 @@
+type: edu
+files:
+  - name: src/Task.kt
+    visible: true
+  - name: test/Tests.kt
+    visible: false

courseSection/psi/editPSI/task.md

@@ -0,0 +1,48 @@
+
+This is a task description file.
+Its content will be displayed to a learner
+in the **Task Description** window.
+
+It supports both Markdown and HTML.
+To toggle the format, you can rename **task.md**
+to **task.html**, or vice versa.
+The default task description format can be changed
+in **Preferences | Tools | Education**,
+but this will not affect any existing task description files.
+
+The following features are available in
+**task.md/task.html** which are specific to the JetBrains Academy plugin:
+
+- Hints can be added anywhere in the task text.
+  Type "hint" and press Tab.
+  Hints should be added to an empty line in the task text.
+  In hints you can use both HTML and Markdown.
+<div class="hint">
+
+Text of your hint
+
+</div>
+
+- You may need to refer your learners to a particular lesson,
+task, or file. To achieve this, you can use the in-course links.
+Specify the path using the `[link_text](course://lesson1/task1/file1)` format.
+
+- You can insert shortcuts in the task description.
+While **task.html/task.md** is open, right-click anywhere
+on the **Editor** tab and choose the **Insert shortcut** option
+from the context menu.
+For example: &shortcut:FileStructurePopup;.
+
+- Insert the &percnt;`IDE_NAME`&percnt; macro,
+which will be replaced by the actual IDE name.
+For example, **%IDE_NAME%**.
+
+- Insert PSI elements, by using links like
+`[element_description](psi_element://link.to.element)`.
+To get such a link, right-click the class or method
+and select **Copy Reference**.
+Then press &shortcut:EditorPaste; to insert the link where appropriate.
+For example, a [link to the "contains" method](psi_element://java.lang.String#contains).
+
+- You can add link to file using **full path** like this:
+  `[file_link](file://lesson1/task1/file.txt)`.

courseSection/psi/editPSI/test/Tests.kt

@@ -0,0 +1,24 @@
+import com.intellij.psi.util.PsiTreeUtil
+import com.intellij.testFramework.fixtures.BasePlatformTestCase
+import org.jetbrains.kotlin.psi.KtNamedFunction
+
+class Test : BasePlatformTestCase() {
+
+    fun testSolution() {
+        var file = myFixture.configureByText("MyClass.kt", """
+            fun sayHello() {
+                println("Hello")
+            }
+            
+            fun sayGoodbye() {
+                println("Goodbye")
+            }
+        """.trimIndent())
+
+        editFunctionName(file, "sayHello", "greetings")
+
+        val functions = PsiTreeUtil.findChildrenOfType(file, KtNamedFunction::class.java)
+        val hasNewFunction = functions.any { it.name == "greetings" }
+        assertTrue(hasNewFunction)
+    }
+}

courseSection/psi/lesson-info.yaml

@@ -4,3 +4,4 @@ content:
   - Try PSI Viewer
   - Accessing PSI Elements
   - Count number of classes
+  - editPSI