extension.js

const vscode = require("vscode");
const editor = vscode.window.activeTextEditor;
const rp = require("request-promise");

async function CreateGist() {
  const text = editor.document.getText(editor.selection);

  // User Input to name Gist file
  const gistName = await vscode.window.showInputBox({
    placeHolder: "Name Your GistTest"
  });

  const options = {
    method: "POST",
    uri: "https://api.github.com/gists",
    headers: {
      "User-Agent": "Request-Promise"
    },
    body: {
      description: "the description for this gist",
      public: true,
      files: {}
    },
    json: true
  };

  options.body.files[gistName] = { content: text };

  rp(options).then(r => {
    const parsedUrl = vscode.Uri.parse(r.html_url);
    vscode.commands.executeCommand("vscode.open", parsedUrl);
  });
}

function activate(context) {
  // this code runs whenever your click 'Create Gist' from the context menu in your browser.
  let disposable = vscode.commands.registerCommand(
    "extension.createGist",
    function() {
      CreateGist();
    }
  );

  context.subscriptions.push(disposable);
}
exports.activate = activate;

function deactivate() {}
exports.deactivate = deactivate;