This is an IDE for a FOUL-like language. FOUL was a language created within the University of Strathclyde's Computer and Information Systems department's CS410 class taught by Dr Conor McBride.
The blog describing certain parts of this is located at http://aworldofcode.blogspot.co.uk/
To run, just download all the files and run
make
./textEditor fileName
Must have gtk2hs package installed with cabal.
cabal install gtk2hs