Insert predefined text at cursor position - visual-studio-code

Question

I want to insert some text at the cursor's position but I didn't find the required code at the API docs.
Is there any function that I could put the parameters within, which solves my problem? This is just for testing.
import * as vscode from 'vscode';
var fs = require('fs');
var flow = require('xml-flow');
var inFile = fs.createReadStream('./your-xml-file.xml');
var xmlStream = flow(inFile);
// this method is called when your extension is activated
// your extension is activated the very first time the command is executed
export function activate(context: vscode.ExtensionContext) {
// Use the console to output diagnostic information (console.log) and errors (console.error)
// This line of code will only be executed once when your extension is activated
console.log('Congratulations, your extension "intrexx-js-lib" is now active!');
// The command has been defined in the package.json file
// Now provide the implementation of the command with registerCommand
// The commandId parameter must match the command field in package.json
let disposable = vscode.commands.registerCommand('intrexx-js-lib.start', () => {
const editor = vscode.window.activeTextEditor;
if(!editor){
vscode.window.showErrorMessage("Editor does not exist!");
return;
}
if (editor.selection.isEmpty) {
const position:vscode.Position = editor.selection.active;
//vscode.window.showInformationMessage(`line: ${position.line} character: ${position.character}`);
}
});
context.subscriptions.push(disposable);
}
// this method is called when your extension is deactivated
export function deactivate() {}

Answer 1

Although rioV8's code works, if any text is selected it will overwrite that text. If you want to ensure that no text is deleted by the insert operation, use edit.insert instead. For rioV8's second example, that means doing this:
vscode.commands.registerTextEditorCommand('intrexx-js-lib.start', (editor, edit) => {
editor.selections.forEach((selection, i) => {
let text = "FooBar " + i;
edit.insert(selection.active, text); // insert at current cursor
})
});

Answer 2

Use a different command register function, it gives you a TextEditorEdit:
vscode.commands.registerTextEditorCommand('intrexx-js-lib.start', (editor, edit) => {
let text = "FooBar";
edit.replace(editor.selection, text);
});
For use with multiple cursors, you'll have to iterate over editor.selections:
vscode.commands.registerTextEditorCommand('intrexx-js-lib.start', (editor, edit) => {
editor.selections.forEach((selection, i) => {
let text = "FooBar " + i
edit.replace(selection, text)
})
});