Extended maintenance of Ruby 1.9.3 ended on February 23, 2015. Read more
extension support for Context
# File irb/extend-command.rb, line 209
def self.def_extend_command(cmd_name, load_file, *aliases)
line = __LINE__; Context.module_eval %[
def #{cmd_name}(*opts, &b)
Context.module_eval {remove_method(:#{cmd_name})}
require "#{load_file}"
send :#{cmd_name}, *opts, &b
end
for ali in aliases
alias_method ali, cmd_name
end
], __FILE__, line
end