guard-markdown2impress
This little addition to guard allows you to run markdown2impress commands when files are modified.
Install
Make sure you have markdown2impress installed.
Install the gem with:
$ gem install guard
$ gem install guard-markdown2impress
And then add a basic setup to your Guardfile:
$ cd /path/to/your/impress-directory
$ guard init markdown2impress
Then what only you have to do is just watch:
$ guard start
$ vi example.md