VSCode extension - how to alter file's text

Question

I have an extension that grabs the open file\'s text and alters it. Once the text is altered, how do I put it back into the file that is displayed in VSCode?

Answer 1

The API you can use here is TextEditor.edit, whose definition is

edit(callback: (editBuilder: TextEditorEdit) => void, options?: {   undoStopBefore: boolean; undoStopAfter: boolean; }): Thenable;

It asks for a callback as the first parameter and in the callback, you can make edits to the document by visiting editBuilder.

I put a sample extension in https://github.com/Microsoft/vscode-extension-samples/tree/master/document-editing-sample which reverses the content in current selection, which is basically a simple use TextEditor.edit.