class Calc

# File plugins/calc.rb, line 19
def self.calculate(expression)
  result = SafeCalc.evaluate(expression)
  return result[:error] if result[:error]

  result[:value]
end

# File plugins/calc.rb, line 15
def self.usage_message
  "Usage: !calc <expression> — e.g. !calc 2+2*3"
end

# File plugins/calc.rb, line 26
def execute(m, expression)
  text = expression.to_s.strip
  if text.empty?
    m.reply self.class.usage_message
    return
  end

  result = self.class.calculate(text)
  if result.is_a?(String)
    m.reply result
    return
  end

  m.reply "= #{result}"
end