import Git from 'simple-git';
import inquirer from 'inquirer';

async function check_workspace_clean() {
    return Git().status().then((result) => {
        if (!result.isClean()) throw new Error('workspace not clean, aborting');
    })
}

export default async () => {
    await check_workspace_clean();

    const result = await Git().branch({'--merged': 'HEAD'});

    const ancestors = result.all;

    const resp = await inquirer.prompt([
        {
            name: 'parent',
            message: 'grand-parent branch: ',
            type: 'list',
            choices: ancestors,
        }
    ])

    console.log(resp);
}