Avery Pennarun 7b8fda5e18 minimal/do: add redo-whichdo support and internal unit tests. ...

Adding redo-whichdo wasn't so hard, except that it exposed a bunch of
mistakes in the way minimal/do was choosing .do files.  Most of the
wrong names it tried didn't matter (since they're very unlikely to
exist) except that they produce the wrong redo-whichdo output.

Debugging that took so much effort that I added unit tests for some
functions to make it easier to find problems in the future.

Note: this change apparently makes minimal/do about 50% slower than
before, because the _find_dofiles algorithm got less optimized (but
more readable).  It's still not very slow, and anyway, since it's
minimal/do, I figured readable/correct code probably outweighed a bit
of speed.  (Although if anyone can come up with an algorithm that's
clear *and* works better, I won't turn it down :)  I feel like I must
be doing it the hard way...)

2018-11-02 02:20:52 -04:00

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