Follow-up Comment #1, bug #64100 (project findutils):
This is quite a sizeable chunk of the available namespace.
I suggest instead we agree a compatible way to extend things while staying
mostly out of each other's way. Here's a strawman:
%{ns/ns/path:keyword:flags}
Here "flags" is the usual size and so on. ns/ns/path is just a namespace
which serves to prevent collision and keyword describes the data to be
formatted. For example,
%{gnu/find:version:-20}
might print the version number of a file, left-justified in a column of width
20. Other implementations of course would be welcome to implement formatting
for gnu/find:version of course.
We put the flags after ! instead of before the { so that we don't have to skip
over flags to look at the keyword, and then have to go back to parse and
understand the flags.
I'm not sure that using : twice inside {} is a great idea because a different
choice would probably make parsing easier. Since my first choice was !, I
changed my mind because of the need/difficulty of escaping ! on Unix systems.
So I fell back on : but maybe there's a better choice.
This idea, by the way, is why GNU find's documentation lists %{ as reserved
for future use.
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