class Byebug::ConditionCommand

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

def execute
  return errmsg "\"condition\" must be followed by " \
                "breakpoint number and expression\n" unless @match[1]
  breakpoints = Byebug.breakpoints.sort_by{|b| b.id }
  largest = breakpoints.inject(0) do |tally, b|
    tally = b.id if b.id > tally
  end
  return print "No breakpoints have been set.\n" if 0 == largest
  return unless pos = get_int(@match[1], "Condition", 1, largest)
  breakpoints.each do |b|
    if b.id == pos
      b.expr = @match[2].empty? ? nil : @match[2]
      break
    end
  end
end

def names
  %w(condition)
end

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