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7.2 Globally redirecting all IO to the REPL

By default SLIME does not change *standard-output* and friends outside of the REPL. If you have any other threads which call format, write-string, etc. that output will be seen only in the *inferior-lisp* buffer or on the terminal, more often than not this is inconvenient. So, if you want code such as this:

(run-in-new-thread
  (lambda ()
    (write-line "In some random thread.~%" *standard-output*)))

to send its output to SLIME’s repl buffer, as opposed to *inferior-lisp*, set swank:*globally-redirect-io* to T.

Note that the value of this variable is only checked when swank accepts the connection so you should set it via ~/.swank.lisp. Otherwise you will need to call swank::globally-redirect-io-to-connection yourself, but you shouldn’t do that unless you know what you’re doing.