42 lines
1.7 KiB
Racket
42 lines
1.7 KiB
Racket
#lang imperative-syndicate
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(require/activate imperative-syndicate/distributed)
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(require/activate imperative-syndicate/drivers/external-event)
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(require (only-in racket/port read-line-evt))
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(assertion-struct Present (name))
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(message-struct Says (who what))
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(define host (make-parameter "localhost"))
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(define port (make-parameter 8001))
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(define scope (make-parameter "chat"))
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(module+ main
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(require racket/cmdline)
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(command-line #:once-each
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["--host" hostname "Server hostname" (host hostname)]
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["--port" portnum "Server port number" (port (string->number portnum))]
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["--scope" scopename "Server scope" (scope scopename)]))
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(spawn #:name 'main
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(field [username (symbol->string (strong-gensym 'chatter-))])
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(define root-facet (current-facet))
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(define url (server-tcp-connection (host) (port) (scope)))
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(during (server-connected url)
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(on-start (log-info "Connected to server."))
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(on-stop (log-info "Disconnected from server."))
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(on (asserted (from-server url (Present $who))) (printf "~a arrived.\n" who))
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(on (retracted (from-server url (Present $who))) (printf "~a departed.\n" who))
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(on (message (from-server url (Says $who $what))) (printf "~a: ~a\n" who what))
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(assert (to-server url (Present (username))))
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(define stdin-evt (read-line-evt (current-input-port) 'any))
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(on (message (inbound (external-event stdin-evt (list $line))))
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(match line
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[(? eof-object?) (stop-facet root-facet)]
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[(pregexp #px"^/nick (.+)$" (list _ newnick)) (username newnick)]
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[other (send! (to-server url (Says (username) other)))]))))
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