I can't find this suggestion in the archives, but maybe I'm just dense
(these are possibly unrelated statements.-)
PatternLayout allows a format of the form %c{2} to show only the last
two components of the category name. Usually for me, it is the initial
number of components to delete that I know: if I'm logging stuff for
com.acme, removing "com.acme" I can fairly easily recognize subpackages,
as in "util" being a short-hand for com.acme.util. But I don't know in
advance how deep the subpackage nesting goes: %c{1} would work here, but
then fail for "com.acme.analysis.util".
So I would like to see something that lets me strip off a certain number
of initial components. For example, %c{-2} to strip off the initial two
components. Or be able to strip off particular class components, as in
%c{-com.acme,-java.lang} to strip off com.acme and java.lang from
components, but leave other category names alone.
(Of course all this goes for %C as well.)
Ken Arnold
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