Add invert mode for holiday.rb

[cruelsmith]

Will return every day of the year that are not holidays:

• Added options to adjust the time of these days.
• Added options to skip spefic week days.

Replaced fixed half day for chrismas and new year with the option to add additional holidays that should be respected int he output.

Needed since icinga2 has issues with excludes

[fbrehm]

Hi @cruelsmith ,

which version of Ruby did you use for testing? I have tested tho following Ruby versions:

• 2.7.6p219
• 2.7.8p225
• 3.0.2p107

With all those ruby versions there it not possible to use the options '--invert' and '--date-range':
frank.brehm@jumphost ~/Develop/github-dpx/monitoring-checks (add_inverted_get_holidays) > /opt/puppetlabs/puppet/bin/ruby get_holidays.rb --invert 'XXXX' 2024 Traceback (most recent call last): get_holidays.rb:102:in

': undefined method -' for nil:NilClass (NoMethodError) 1 frank.brehm@jumphost ~/Develop/github-dpx/monitoring-checks (add_inverted_get_holidays) > /opt/puppetlabs/puppet/bin/ruby get_holidays.rb --date-range 'XXXX' 2024 Traceback (most recent call last): get_holidays.rb:102:in ': undefined method -' for nil:NilClass (NoMethodError) 1 frank.brehm@jumphost ~/Develop/github-dpx/monitoring-checks (add_inverted_get_holidays) >

Btw., it would be nice to use a working hash bang, e.g. '#!/usr/bin/env ruby'. Otherwise the script would be interpreted by your current shell with the appropriate error messages, if you are calling it directly.

Cheers Frank

[cruelsmith]

Closing the PR since it can not solve or workaround the underlying icinga2 issue: Icinga/icinga2#9781
It can only be fixed by upstream since every possible time definition as we would need for this one here is currently broken.