Steganographic BF

A steganographic programming language interepreted from the length of git commit messages.

How it works

The length of your commit message (without spaces) modulo 8 maps straighforwardly to BF. A quick translation table:

Commit message length mod 8	BF translation
0	<
1	>
2	+
3	-
4	.
5	,
6	[
7	]

Get Started

The commit messages in this repository contain an example script. To build the interpreter, you need a Haskell compiler. For example:

ghc -O2 steg.hs

builds the interpreter. Scripts are interpreted by the commit messages of a specified author from the root of a git project. For this repository:

steg hello

should now give an appropriate output.

Do I have to type the commit messages manually?

There is a basic translation tool from BF which can be built as follows:

ghc bf2steg.hs
bf2steg $BF_FILE.bf $AUTHOR_NAME

which results in a shell script that can populate a repository with empty commits, but appropriate commit messages from a given BF source code. Running source $AUTHOR_NAME.sh then should yield the program.

A bundled script to translate from git commit messages to BF for a given author is also provided.

ghc steg2bf.hs
steg2bf $AUTHOR_NAME

With the above translation tools, it should be possible to do all sorts, like write steganographic BF via C using a C to BF compiler, or make a steganographic version of Conway's Game of Life. A source for quality BF programs can be found here.