Various Small Fires and Code

Thursday, October 15, 2015


I've been working steadily on Payasan and I've now got chord note and fret diagram output working for fret diagrams.

As GitHub counts successive commits and helpfully tells you how long your current streak is I haven't felt the need to blog here about each commit. Also while I'm happy with the progress of Payasan, I think it is going to be a highly idiomatic system (i.e. it will make sense for me, but it will be too "special case" for other users) so publicly blogging about it is not a priority.

Friday, September 18, 2015


I've implemented "chordmode" for Payasan patterned after LilyPond's chordmode.

Chordmode is intended as an intermediate layer for working with chords - LilyPond's chordmode is a bit inscrutable at some points and I believe I have a simpler representation for building and manipulating chords.

The implementation points to quite a few horrors in the module organization of Payasan that I will need to address. I already have 70 modules in the src directory which is excessive and I'll have to do something about combining some of them.

Monday, September 14, 2015


Most of the work is now in place for LilyPond percussion notelists. Some work on rendering is still outstanding.

Sunday, September 13, 2015


I've started to add support for LilyPond drum pitches. This work should point out what bits of Payasan need parameterizing on Pitch. The syntax is already polymorphic on pitch and duration, but so far I haven't treated the parsers and renderers systematically.

Friday, September 11, 2015


I've implemented "full score" output for ABC and LilyPond rather than just output of note list fragments.

It is an expectation of Payasan that the output will be hand-edited after generation if the user wants to create proper scores. However, to "debug" note lists after they have been built, transformed, etc. a user needs to generate a "full score" that can be automatically rendered by LilyPond or ABC to see their work.

Thursday, September 10, 2015


I've added transformations for augmentation and diminution to the monophonic note list.

It is a key goal that Payasan should support musical transformations so having these two implemented is a nod in favour of the utility of this version of Payasan.

Sunday, September 6, 2015


I'm working towards adding debugging to the translation steps (LilyPond pitch conversion has had a bug for the best part of a week). I'm not sure what the API should be, but at least with the current temporary implementation I can see where the pitch conversion bug occurs.

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Disambiguating biog as there are a few Stephen Tetley's in the world. I'm neither a cage fighter or yachtsman. I studied Fine Art in the nineties (foundation Bradford 1992, degree Cheltenham 1992 - 95) then Computing part-time at Leeds Met graduating in 2003. I'm the Stephen Tetley on Haskell Cafe and Stackoverflow.