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magic-ed

This strange library replaces standard cl:ed function with a new one, which executes editor specified in the EDITOR environment variable.

It does not work from SLY, so I had to run a raw REPL:

* sb-ext:*ed-functions*
NIL
* (cl:ed "qlfile")

debugger invoked on a SB-INT:EXTENSION-FAILURE in thread
#<THREAD "main thread" RUNNING {1000518083}>:
  Don't know how to ED qlfile
See also:
  The SBCL Manual, Variable *ED-FUNCTIONS*

Type HELP for debugger help, or (SB-EXT:EXIT) to exit from SBCL.

restarts (invokable by number or by possibly-abbreviated name):
  0: [ABORT] Exit debugger, returning to top level.

(ED "qlfile")
0] ^D
* (ql:quickload :magic-ed)
To load "magic-ed":
  Load 1 ASDF system:
    magic-ed
; Loading "magic-ed"

(:MAGIC-ED)
* sb-ext:*ed-functions*
(MAGIC-ED:ED-EDITOR)
* (cl:ed "qlfile")
T

Also, this library provides a function magic-ed which is able to return file’s content and evaluate the lisp code:

* (magic-ed:magic-ed "/tmp/foo" :output :string)
...
HERE Vim WAS STARTED AND I EDITED THE FILE
...
"(format t \"Blah~%\")
"
*

Can somebody tell me when this could be useful if you can just use Emacs and SLIME?