68 lines
1.8 KiB
Racket
68 lines
1.8 KiB
Racket
#lang racket
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(require (prefix-in net: "net.rkt")
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(prefix-in gmi: "gmi.rkt"))
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;; global state variable which will be an input port containing the
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;; rendered out gemtext document as it shall be shown to the user
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(define document-buffer null)
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;; global state which will be the document structure, before rendering
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(define document null)
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(define (go-cmd url)
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(if (non-empty-string? url)
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(let-values ([(status meta c-in) (net:get url)])
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(let-values ([(doc) (gmi:parse (port->lines c-in))]
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[(db-in db-out) (make-pipe #f)])
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(set! document doc)
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(set! document-buffer db-in)
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(parameterize ([current-output-port db-out])
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(gmi:render doc))
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(let ([remaining (pipe-content-length db-in)])
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(printf "document retrieved. ~a bytes\n" remaining))
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(next-cmd)))
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(displayln "go where?")))
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(define (next-cmd)
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(define (iter depth)
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(when (> depth 0)
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(let ()
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(displayln (read-line document-buffer))
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(iter (sub1 depth)))))
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(iter 10)
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(newline)
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(let ([remaining (pipe-content-length document-buffer)])
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(printf "~a bytes remaining\n" remaining)))
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(define (visit-cmd line)
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(go-cmd (gmi:match-link document (string->number line))))
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(define (repl)
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(display "G-300 > ")
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(let ([matches (regexp-match #px"(\\w+)\\s*(.*)" (read-line))])
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(cond
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;; next command. also default
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[(or (not matches)
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(string=? (cadr matches) "next")
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(string=? (cadr matches) "n"))
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(next-cmd)]
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;; go command
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[(or (string=? (cadr matches) "go")
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(string=? (cadr matches) "g"))
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(go-cmd (caddr matches))]
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;; visit link command
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[(andmap char-numeric? (string->list (cadr matches)))
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(visit-cmd (cadr matches))]))
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(repl))
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