require 'byebug/command'

module Byebug
  #
  # Stop tracing a global variable.
  #
  class UntracevarCommand < Command
    self.allow_in_post_mortem = false

    def regexp
      /^\s* untr(?:acevar)? (?:\s+ (\S+))? \s*$/x
    end

    def execute
      var = @match[1]
      if global_variables.include?(:"#{var}")
        eval("untrace_var(:\"#{var}\")")
        puts pr('trace.messages.undo', var: var)
      else
        errmsg pr('trace.errors.not_global', var: var)
      end
    end

    class << self
      def names
        %w(untracevar)
      end

      def description
        prettify <<-EOD
          untr[acevar] <variable>

          Stop tracing global variable <variable>.
        EOD
      end
    end
  end
end