[Tcsh] various color ls-F fixes

[Luke Mewburn]

I found another intermittent ln=target bug, which I thought I'd
already caught and fixed.

Fixed in commit e113c39 in the same pull request.


Luke.

On 23-03-12 20:25, Luke Mewburn wrote:
  | I noticed that the color ls-F support had various niggles and bugs,
  | especially with the GNU ls LS_COLORS or FreeBSD/macOS ls LSCOLORS,
  | so I fixed the problems.
  | 
  | I've created a pull request with a bunch of changes related to color ls-F:
  | 	https://github.com/tcsh-org/tcsh/pull/71
  | 
  | Details:
  | 
  | - Improve color ls-F documentation
  | 	- clarify missing is for orphaned (broken) symlinks
  | 	- document LSCOLORS (it previous wasn't)
  | 
  | - Extended the testsuite:
  | 	- added more comments and keywords (-k ...)
  | 	- move ls-F tests to own ls-F.at
  | 	- add color ls-F tests (see CLICOLOR_FORCE)
  | 
  | - On startup, use LS_COLORS in preference to LSCOLORS. This is a
  |   behaviour change, but given that LS_COLORS provides more features
  |   than LSCOLORS, platforms generally only set one or the other,
  |   tcsh had LS_COLORS first, and LSCOLORS wasn't documented,
  |   I thought it was a reasonble change.
  | 
  | - Implement CLICOLOR_FORCE, to force color ls even if output isn't
  |   to a terminal.  This was needed for the color ls-F testsuite.
  |   I followed the FreeBSD / macOS behaviour (which uses the presence
  |   to enable force), because that appears to be the original canonical
  |   implementation. Some random websites claim it should be
  |   CLICOLOR_FORCE=1 and CLICOLOR_FORCE=0 disables, but there wasn't
  |   an obvious example of prior art.
  | 
  | - Fix LSCOLORS bold mode support. The bug appears to be in original
  |   LSCOLORS implementation in commit dcedb93 on 2012-06-21 (which
  |   determined the bold status but didn't use it), and my fix partially
  |   reverted commit abdf5f1 on 2015-05-28 which removed that unused variable.
  | 
  | - Fix 'ls-F directory' when using LS_COLORS ln=target. The new code
  |   is simpler than the bespoke readlink() chasing - it just uses
  |   filetype() with stat() instead of lstat().
  | 
  | - Fix resetting of ln=target on unsetenv LS_COLORS or setenv LSCOLORS.
  | 
  | - I updated "Fixes" with sample entries.
  | 
  | 
  | In the future I may enhance color ls-F to to support
  | more features from LSCOLORS / LS_COLORS:
  | 
  | LSCOLORS	LS_COLORS	Description
  | entry 8		su=		setuid executable
  | entry 9		sg=		setgid executable
  | entry 10	tw=		directory o+w,+t
  | entry 11	ow=		directory o+w
  |  (n/a)		st=		directory +t
  |  		mh=		regular file extra links
  | 		ca=		file with capability (linux only?)
  | 
  | 
  | 
  | cheers,
  | Luke.



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