ensurer

ensurer.js

function Ensure (check, action)
{
	return function ensurer (data)
	{
		return capture(() => check(data))
		.then(so =>
		{
			if (! so)
			{
				if (! action)
				{
					throw new TypeError('Ensure: cannot handle')
				}

				return capture(() => action(data))
			}
		})
	}
}

Ensure.directory_exists = () =>
{
	var fs = require('fs-sync')

	return Ensure(fs.exists, fs.mkdir)
}

Ensure.directory_must_exist = () =>
{
	var exists = require('fs-sync').exists

	return Ensure(dir =>
	{
		if (! exists(dir))
		{
			throw new TypeError('directory_must_exist')
		}

		return true
	})
}