Re: [Lilypond-auto] Issue 3182 in lilypond: Patch: Defuse the obfuscated Scheme programming contest

[David Kastrup]

Marc Hohl <address@hidden> writes:

> If this erroneous use of reduce cannot be resolved quickly, it would
> be best to raise an issue for this.

I can't even judge if it is erroneous (namely leading to wrong results),
and that's what makes it a problem.

> Well, a do loop in scheme felt kinda weird, but map didn't work here
> (I rewrote a bunch of other do loops this way, but here it failed).  I
> didn't manage to iterate over the list (or two lists in this case),
> building up a list of results where a specific element is inserted
> only when certain conditions are fulfilled.

Sounds like a case for "fold" (of which reduce is a variation), and fold
can work over several lists at once.

> Grepping through the code, I found out that reduce would work here,

And that's the worst problem with our incomprehensible code base:
incomprehensible code begets incomprehensible code.  Somewhat
misapplied: De Düwel schitt immer opp den grötsten Hupen.

-- 
David Kastrup