I have started an implementation of m4 in PIR. See http://www.gnu.org/software/m4/m4.html.
Initially I wanted to tackle Ruby or QCL, http://tph.tuwien.ac.at/~oemer/qcl.html. But I found those too intimidating.
The goal is to make a lot of tests work, and eventually getting a drop in replacement for GNU m4.
The plan is to implement everything in PIR, thus building on existing PMCs.
The curious can take look at the present status in: http://www.schmalhofer.info/schmalhofer/bernhard/projects/m4/.
Is there already a testing framework in PIR or PASM? For now I've just tweaked the Makefile from bf.
CU, Bernhard
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