Ed Emulator Mode

Ed Emulator Mode

[Matthew Flaschen]

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I thought about this once before, but the recent discussion about
viper/vimpact reminded me.  Has anyone made an ed-mode, as in an
emulator for ed, THE STANDARD TEXT EDITOR
(http://www.gnu.org/fun/jokes/ed.msg.html).  I just thought it might be
a fun way to learn some emacs lisp.

Does anyone know if this has been done?

So far, I intend to show the file/buffer being edited in one window, and
the ed "interface" in the other window.  A couple other things I'm
wondering:

How do I locally override ALL keys, like a wildcard?  I need to reject
all invalid keys with ? in command mode, so I thought it would best to
reject all, then selectively allow valid keys.  I think this will also
keep them from trying to manipulate the interface manually?

Is there some mode/function that's really worth overriding?  I thought
about it, but I figured it would be best done from scratch, (as a minor
mode?).  I'm still kind of vague on this, though.

Any other ideas welcome. :)

Matthew Flaschen


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Re: Ed Emulator Mode

[Kim F. Storm]

Matthew Flaschen <matthew.flaschen@gatech.edu> writes:

> How do I locally override ALL keys, like a wildcard? 

You can specify a default binding (event = t).

`(t . BINDING)'
     This specifies a "default key binding"; any event not bound by
     other elements of the keymap is given BINDING as its binding.
     Default bindings allow a keymap to bind all possible event types
     without having to enumerate all of them.  A keymap that has a
     default binding completely masks any lower-precedence keymap,
     except for events explicitly bound to `nil' (see below).

-- 
Kim F. Storm  http://www.cua.dk

Re: Ed Emulator Mode

[Matthew Flaschen]

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Kim F. Storm wrote:
> Matthew Flaschen <matthew.flaschen@gatech.edu> writes:
> 
>> How do I locally override ALL keys, like a wildcard? 
> 
> You can specify a default binding (event = t).
> 
> `(t . BINDING)'
>      This specifies a "default key binding"; any event not bound by
>      other elements of the keymap is given BINDING as its binding.
>      Default bindings allow a keymap to bind all possible event types
>      without having to enumerate all of them.  A keymap that has a
>      default binding completely masks any lower-precedence keymap,
>      except for events explicitly bound to `nil' (see below).

Thanks. On second thought, I'm pretty sure I can't use that for ed-mode
(I'll have to do real parsing), but I'll keep it in mind.

Matthew Flaschen



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