52 lines
2.2 KiB
Racket
52 lines
2.2 KiB
Racket
#lang scheme/base
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(require syntax/moddep "logger.ss")
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(provide reload-module)
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(define (reload-module modspec path)
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;; the path argument is not needed (could use resolve-module-path here), but
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;; its always known when this function is called
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(let* ([name ((current-module-name-resolver) modspec #f #f)])
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(log-line "(re)loading module from ~a" modspec)
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(parameterize ([current-module-declare-name name]
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[compile-enforce-module-constants #f])
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;; only notify, it's fine to reset the file timer, since there's no point
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;; in attempting to reload it yet again until it is edited.
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(with-handlers ([exn? (lambda (e)
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(log-line "error, module not reloaded (~a)"
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(exn-message e)))])
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(namespace-require '(only scheme module #%top-interaction))
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(load/use-compiled path)))))
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;; pulls out a value from a module, reloading the module if its source file was
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;; modified
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(provide auto-reload-value)
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(define module-times (make-hash))
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(define (auto-reload-value modspec valname)
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(let* ([path (resolve-module-path modspec #f)]
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[last (hash-ref module-times path #f)]
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[cur (file-or-directory-modify-seconds path)])
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(unless (equal? cur last)
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(hash-set! module-times path cur)
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(reload-module modspec path))
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(dynamic-require modspec valname)))
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(define poll-freq 2000.0) ; poll at most once every two seconds
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;; pulls out a procedure from a module, and returns a wrapped procedure that
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;; automatically reloads the module if the file was changed whenever the
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;; procedure is used
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(provide auto-reload-procedure)
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(define (auto-reload-procedure modspec procname)
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(let ([path (resolve-module-path modspec #f)] [date #f] [proc #f] [poll #f])
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(define (reload)
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(unless (and proc (< (- (current-inexact-milliseconds) poll) poll-freq))
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(set! poll (current-inexact-milliseconds))
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(let ([cur (file-or-directory-modify-seconds path)])
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(unless (equal? cur date)
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(set! date cur)
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(reload-module modspec path)
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(set! proc (dynamic-require modspec procname))))))
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(reload)
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(lambda xs (reload) (apply proc xs))))
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