Expensive metadata blocking (-b).
Default should be to probe for all implied needed by filter,sort,format but
introduce an enum for each kind of data query/context and a way to omit/be
empty upon user request. Besides data probes like stat/readlink/ACL/magic,
classifier groups run against the data should also be omittable (maybe only
when there are no filters or all tests within some group/dimension use
similar data that's been omit-requested). This way a user can define a
bunch of expensive-but-fast-enough-most-of-the-time things but have an easy
out to speed-up execution in more expensive contexts like big directories,
eg. "lc -bacl -bmag" or even "lc -sbasic" to revert to basic data only.
The impl can maybe just be to unwind the cf.need system and ensure that a
usable but "empty" default always exists.
Can maybe distribute some lib for VC-status kinding/indirect deps on VC libs.
Symbolic link targets could be abbreviated on a component-by-component basis. { This may be expensive for many symlinks, but abbreviation is already on the expensive side. } Abbreviating multi-component a/b/c names is also buggy.
selinux security context labels (ls -Z) (first do some cligen/selinux.nim:getfilecon,etc. Then should be easy.)
Though current "just has it" kinding works to color by ACL/Linux capability, it'd be nicer to actually format out the text. { Capabilities are short-ish, but ACL spellings are typically not table-friendly. So maybe just caps. }
Make -H take an attr instead of being a bool; Render header only if .len>0. So, space can render without attrs. Leading + can replicate headers across major columns. Best to apply attr to start of 1st header and turn off attrs at end of last so intermediate space is all e.g., underlined.