43 lines
925 B
Scheme
43 lines
925 B
Scheme
(library
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(logging)
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(export with-log-port-thunk
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with-log-port
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info
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warn
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log-error)
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(import (chezscheme)
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(fmt fmt)
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(list-utils)
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(utils))
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(define log-port (current-error-port))
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(define (with-log-port-thunk port thunk)
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(fluid-let ((log-port port))
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(thunk)))
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(define-syntax with-log-port
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(syntax-rules ()
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((_ port b1 b2 ...)
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(with-log-port-thunk port
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(lambda ()
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b1 b2 ...)))))
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;; FIXME: include timestamp
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(define (output-to-log level doc)
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(fmt log-port
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(dsp (symbol->string level))
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(dsp ": ")
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(apply cat (intersperse (dsp " ") doc))
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nl))
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(define-syntax define-level
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(syntax-rules ()
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((_ sym level) (define (sym . doc) (output-to-log 'level doc)))))
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(define-level info info)
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(define-level warn warn)
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(define-level log-error error))
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