Revision history for Perl module Term::Highlight and script hl.
2006/01/16 - Version 1.0 - first functional version.
2006/02/10 - Version 1.1 - generic approach to 16/256 color terminals.
2006/02/13 - Version 1.2 - basic functionality moved to Highlight.pm,
supports grep option ('-g') with recursive search ('-r'),
reads from STDIN as well as from file list.
2006/02/15 - Version 1.3 - more sophisticated option reset functionality added.
Support for binary files added.
2008/12/16 - Version 1.4 - support for HL_INITSTRING environment variable
which can be used to set common options
(e.g. default hl color) for all cases.
2008/12/19 - Version 1.5 - distributed as perl package (using Makefile.PL),
Highlight.pm now uses strict,
Highlight.pm cleanup from global variable @Patterns
(moved to class implementation),
tagtypes with "xterm" uses "term",
perl pod sections fixed and significantly extended,
'hl -help' cleanup.
2010/08/17 - Version 1.6 - bugfix in hl script.
"Attempt to free unreferenced scalar value" message at exit is
now fixed.
2010/09/17 - Version 1.7 - in hl added possibility to store highlight snippets
in file .hlrc in HOME directory.
2011/09/09 - Version 1.7.1 - hl will not put color escape sequences if output
directed not to STDOUT: this will make it possible to use hl
safely in pipes.
2015/10/25 - Version 1.8 - fixing multiple errors in hl, including:
option '-' did not work when global option '-b' was set,
added global option '-u' to match Unicode characters,
added global option '--' to explicitly separate global and
highlight options.
Highlight.pm version 1.3 - resetting of bold typeface and
background colors could not work.
2016/05/31 - Version 1.8.4 - various fixes related mostly to multiple files
processing.
2016/06/01 - Version 1.8.5 - much faster start time when recursive grep is not
needed.
2016/06/05 - Version 1.8.6 - minor bug fixes and docs updates.
2016/06/26 - Version 1.8.7 - added option '-n' to print line numbers,
file names and line numbers can now be colorized by setting of
an environment variable HL_LOCATION.
Highlight.pm version 1.5 - ignore zero-length matches.
2016/06/27 - Version 1.8.8 - added option '-c' to print context lines around
matches.
2016/06/28 - Version 1.8.9 - fixes in context lines processing
2016/07/14 - Version 1.9.0 - allow natural Unicode symbols in input patterns
when option '-u' is set. Support for granular snippet files to
help hl start faster.
2016/07/21 - Version 1.9.1 - significant speed optimization in the grep mode.
Highlight.pm version 1.6 - added a new interface function.