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racketui's Introduction
RacketUI - Automated Web UI Generator for Racket
================================================
RacketUI is intended to be a teachpack to provide facilities for the
quick and easy generation of web interfaces for programs written in
the HtDP (_How to Design Programs_) languages of Racket (see
docs.racket-lang.org).
Example
-------
Consider the following program, which builds an acronym from the
capitalized words in a list of strings (comments and test cases are
omitted):
(define (acronym a-los)
(cond [(empty? a-los) ""]
[(cons? a-los) (cond
[(string-upper-case? (string-ith (first a-los) 0))
(string-append (string-ith (first a-los) 0)
(acronym (rest a-los)))]
[else (acronym (rest a-los))])]))
A web application for this can be automatically generated using:
(require (planet nah22/racketui/web-launch))
(web-launch
"Acronym Builder"
(function "Produces an acronym of the capitalized words in the given list."
(acronym ["Words" (listof+ ["Word" string+])]
->["The acronym" string])))
Running this program should launch a web browser with an user
interface allowing input of a list of words (strings) and the
ability to apply the function to that input to view the result.
License
-------
RacketUI
Copyright (c) 2010-2011 Nadeem Abdul Hamid
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racketui's Issues
Timeout if function takes > 60 seconds to execute.
If a request takes longer than 60 seconds to execute, web-server's safety-limits cause the connection to be closed and the result is never returned to the end-user. One (hacky) solution is to disable those limits, which I've submitted as #4. Wondering if there is a more elegant way of doing it: sending a heartbeat maybe? In any case, here is the stack trace:
Your Web application is running at http://localhost:8000/carlv001.rkt.
Stop this program at any time to terminate the Web Server.
write-string: output port is closed
output port: #output-port:tcp-accepted
errortrace...:
context...:
raise-arguments-error
try-again
loop
[repeats 2 more times]
fprintf
.../http/response.rkt:72:0: output-response-head
.../private/more-scheme.rkt:261:28
call-in-empty-metacontinuation-frame
[repeats 1 more time]
.../private/more-scheme.rkt:168:6: loop
.../private/dispatch-server-with-connect-unit.rkt:144:4: connection-loop
call-in-empty-metacontinuation-frame
[repeats 1 more time]
call-with-empty-metacontinuation-frame-for-swap
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