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(define-module (hnh util exceptions)
#:use-module (srfi srfi-1)
#:use-module (hnh util)
#:use-module (ice-9 format)
#:use-module ((system vm frame)
:select (frame-bindings binding-ref))
)
(define-public warning-handler
(make-parameter
(lambda (fmt . args)
(format #f "WARNING: ~?~%" fmt args))))
(define-public warnings-are-errors
(make-parameter #f))
;; forwards return from warning-hander. By default returns an unspecified value,
;; but instances are free to provide a proper return value and use it.
(define-public (warning fmt . args)
(display (apply (warning-handler) fmt (or args '()))
(current-error-port))
(when (warnings-are-errors)
(throw 'warning fmt args)))
(define-public (fatal fmt . args)
(display (format #f "FATAL: ~?~%" fmt (or args '()))
(current-error-port))
(raise 2)
)
(define-public (filter-stack pred? stk)
(concatenate
(for i in (iota (stack-length stk))
(filter pred? (map binding-ref (frame-bindings (stack-ref stk i)))))))
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