GNU Emacs can be programmed to emulate (more or less) most other
editors. Standard facilities can emulate these:
- CRiSP/Brief (PC editor)
- You can turn on key bindings to emulate the CRiSP/Brief editor with
M-x crisp-mode. Note that this rebinds M-x to exit Emacs
unless you set the variable
crisp-override-meta-x. You can
also use the command M-x scroll-all-mode or set the variable
crisp-load-scroll-all to emulate CRiSP's scroll-all feature
(scrolling all windows together).
- EDT (DEC VMS editor)
- Turn on EDT emulation with M-x edt-emulation-on. M-x
edt-emulation-off restores normal Emacs command bindings.
Most of the EDT emulation commands are keypad keys, and most standard
Emacs key bindings are still available. The EDT emulation rebindings
are done in the global keymap, so there is no problem switching
buffers or major modes while in EDT emulation.
- TPU (DEC VMS editor)
- M-x tpu-edt-on turns on emulation of the TPU editor emulating EDT.
- vi (Berkeley editor)
- Viper is the newest emulator for vi. It implements several levels of
emulation; level 1 is closest to vi itself, while level 5 departs
somewhat from strict emulation to take advantage of the capabilities of
Emacs. To invoke Viper, type M-x viper-mode; it will guide you
the rest of the way and ask for the emulation level. see Viper.
- vi (another emulator)
- M-x vi-mode enters a major mode that replaces the previously
established major mode. All of the vi commands that, in real vi, enter
“input” mode are programmed instead to return to the previous major
mode. Thus, ordinary Emacs serves as vi's “input” mode.
Because vi emulation works through major modes, it does not work
to switch buffers during emulation. Return to normal Emacs first.
If you plan to use vi emulation much, you probably want to bind a key
- vi (alternate emulator)
- M-x vip-mode invokes another vi emulator, said to resemble real vi
more thoroughly than M-x vi-mode. “Input” mode in this emulator
is changed from ordinary Emacs so you can use <ESC> to go back to
emulated vi command mode. To get from emulated vi command mode back to
ordinary Emacs, type C-z.
This emulation does not work through major modes, and it is possible
to switch buffers in various ways within the emulator. It is not
so necessary to assign a key to the command
it is with
vi-mode because terminating insert mode does
not use it.
see VIP, for full information.
- WordStar (old wordprocessor)
- M-x wordstar-mode provides a major mode with WordStar-like