6 Extension modules

Eshell provides a facility for defining extension modules so that they can be disabled and enabled without having to unload and reload them, and to provide a common parent Customize group for the modules.¹ An Eshell module is defined the same as any other library but one requirement: the module must define a Customize² group using eshell-defgroup (in place of defgroup) with eshell-module as the parent group.³ You also need to load the following as shown:

     (eval-when-compile
       (require 'cl)
       (require 'esh-mode)
       (require 'eshell))
     
     (require 'esh-util)

• Writing a module
• Module testing
• Directory handling
• Key rebinding
• Smart scrolling
• Terminal emulation