You can generate this:
But create it visually, by using this (http://asciiflow.com):
The Java based tool that generates the bitmap image from the ASCII graph is called DITAA (DIagrams Through Ascii Art) (http://ditaa.sourceforge.net/).
I personally use the ditaa plugin for Dokuwiki this to embed flowchart diagrams into my Dokuwiki hosted documentation. Dokuwiki is a decently powerful wiki software similar to Mediawiki, etc. One major difference is that it uses flat files instead of an RDBMS. You can use either the flat file standard setup or the Git Backed plugin to have it as part of the SCM. Makes for much easier management and automatic documentation generation!