class Byebug::ConditionCommand

def description
  %(cond[ition] <n>[ expr]
    Specify breakpoint number <n> to break only if <expr> is true. <n> is
    an integer and <expr> is an expression to be evaluated whenever
    breakpoint <n> is reached. If no expression is specified, the
    condition is removed.)
end

def execute
  return puts(ConditionCommand.help) unless @match[1]
  breakpoints = Byebug.breakpoints.sort_by { |b| b.id }
  return errmsg('No breakpoints have been set') unless breakpoints.any?
  pos, err = get_int(@match[1], 'Condition', 1)
  return errmsg(err) if err
  breakpoint = breakpoints.find { |b| b.id == pos }
  return errmsg('Invalid breakpoint id. Use "info breakpoint" to find ' \
                'out the correct id') unless breakpoint
  return errmsg("Incorrect expression \"#{@match[2]}\", " \
                'breakpoint not changed') unless syntax_valid?(@match[2])
  breakpoint.expr = @match[2]
end

def names
  %w(condition)
end

def regexp
  /^\s* cond(?:ition)? (?:\s+(\d+)(?:\s+(.*))?)? \s*$/x
end