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https://github.com/Gnucash/gnucash.git
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82 lines
3.6 KiB
Scheme
82 lines
3.6 KiB
Scheme
;; This program is free software; you can redistribute it and/or
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;; modify it under the terms of the GNU General Public License as
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;; published by the Free Software Foundation; either version 2 of
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;; the License, or (at your option) any later version.
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;;
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;;
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;; You should have received a copy of the GNU General Public License
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;; along with this program; if not, contact:
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;;
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;; Free Software Foundation Voice: +1-617-542-5942
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;; 51 Franklin Street, Fifth Floor Fax: +1-617-542-2652
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;; Boston, MA 02110-1301, USA gnu@gnu.org
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(define-module (gnucash app-utils c-interface))
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(use-modules (ice-9 match))
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(use-modules (gnucash core-utils)
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(gnucash utilities))
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(export gnc:make-string-database)
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(export gnc:call-with-error-handling)
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(export gnc:apply-with-error-handling)
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(export gnc:eval-string-with-error-handling)
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(export gnc:backtrace-if-exception)
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(define (gnc:call-with-error-handling cmd args)
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(let ((captured-stack #f)
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(captured-error #f)
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(result #f))
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(catch #t
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(lambda ()
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;; Execute the code in which you want to catch errors here.
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(cond
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((procedure? cmd) (set! result (apply cmd args)))
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((string? cmd) (set! result (eval-string cmd)))))
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(lambda (key . parameters)
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;; Put the code which you want to handle an error after the
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;; stack has been unwound here.
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(set! captured-error
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(call-with-output-string
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(lambda (port)
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(display-backtrace captured-stack port)
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(newline port)
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(print-exception port #f key parameters)))))
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(lambda (key . parameters)
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;; Capture the stack here, cut the last 3 frames which are
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;; make-stack, this one, and the throw handler.
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(set! captured-stack (make-stack #t 3))))
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(list result captured-error)))
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;; gnc:eval-string-with-error-handling will evaluate the input string (cmd)
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;; an captures any exception that would be generated. It returns
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;; a list with 2 elements: the output of the evaluation and a backtrace.
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;; The first may be set if string evaluation did generate
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;; output, the latter is set when an exception was caught.
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;; We'll use this to wrap guile calls in C(++), allowing
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;; the C(++) code to decide how to handle the errors.
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(define (gnc:eval-string-with-error-handling cmd)
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(gnc:call-with-error-handling cmd '()))
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;; gnc:apply-with-error-handling will call guile's apply to run func with args
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;; an captures any exception that would be generated. It returns
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;; a list with 2 elements: the output of the evaluation and a backtrace.
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;; The first may be set if the result of the apply did generate
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;; output, the latter is set when an exception was caught.
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;; We'll use this to wrap guile calls in C(++), allowing
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;; the C(++) code to decide how to handle the errors.
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(define (gnc:apply-with-error-handling func args)
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(gnc:call-with-error-handling func args))
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(define (gnc:backtrace-if-exception proc . args)
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(match (gnc:apply-with-error-handling proc args)
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((result #f) result)
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((_ captured-error)
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(display captured-error (current-error-port))
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(when (defined? 'gnc:warn) (gnc:warn captured-error))
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#f)))
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