remicharms: errors.cr at tip

File src/remicharms/errors.cr from the latest check-in

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#### RemiCharms
#### Based on CL-Charms
#### Copyright (C) 2023 Remilia Scarlet <remilia@posteo.jp>
#### Copyright (c) 2014 Robert Smith <quad@symbo1ics.com>
####
#### This program is free software: you can redistribute it and/or
#### modify it under the terms of the GNU Affero General Public
#### License as published by the Free Software Foundation, either
#### version 3 of the License, or (at your option) any later version.
####
#### This program is distributed in the hope that it will be useful,
#### but WITHOUT ANY WARRANTY; without even the implied warranty of
#### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
#### Affero General Public License for more details.
####
#### You should have received a copy of the GNU Affero General Public License
#### along with this program.  If not, see <https://www.gnu.org/licenses/>.

module RemiCharms
  # Represents an error that occurs within the RemiCharms library.
  class Error < ::Exception
  end

  @[AlwaysInline]
  protected def self.checkStatus(value, errorMsg : String? = nil)
    if value == NCurses::ERR
      raise Error.new(errorMsg || "Error in curses call: (returned value: #{value})")
    end
    value
  end
end