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;;; condition.scm -- Skribilo SRFI-35 error condition hierarchy.
;;; -*- coding: iso-8859-1 -*-
;;;
;;; Copyright 2006, 2007, 2008, 2015, 2018 Ludovic Court�s <ludo@gnu.org>
;;;
;;;
;;; This file is part of Skribilo.
;;;
;;; Skribilo is free software: you can redistribute it and/or modify
;;; it under the terms of the GNU General Public License as published by
;;; the Free Software Foundation, either version 3 of the License, or
;;; (at your option) any later version.
;;;
;;; Skribilo is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with Skribilo. If not, see <http://www.gnu.org/licenses/>.
(define-module (skribilo condition)
#:autoload (srfi srfi-1) (find)
#:use-module (srfi srfi-34)
#:use-module (srfi srfi-35)
#:use-module (srfi srfi-39)
#:use-module (ice-9 optargs)
#:autoload (skribilo parameters) (*destination-file*)
#:autoload (skribilo utils syntax) (G_ N_)
#:export (&skribilo-error skribilo-error?
invalid-argument-error
&invalid-argument-error invalid-argument-error?
&too-few-arguments-error too-few-arguments-error?
&file-error file-error?
&file-search-error file-search-error?
&file-open-error file-open-error?
&file-write-error file-write-error?
register-error-condition-handler!
lookup-error-condition-handler
%call-with-skribilo-error-catch
call-with-skribilo-error-catch
call-with-skribilo-error-catch/exit))
;;; Author: Ludovic Court�s
;;;
;;; Commentary:
;;;
;;; Top-level of Skribilo's SRFI-35 error conditions.
;;;
;;; Code:
;;;
;;; Standard error conditions.
;;;
(define-condition-type &skribilo-error &error
skribilo-error?)
;;;
;;; Generic errors.
;;;
(define-condition-type &invalid-argument-error &skribilo-error
invalid-argument-error?
(proc-name invalid-argument-error:proc-name)
(argument invalid-argument-error:argument)
(name invalid-argument-error:name)) ;#f | symbol, for kw arguments
(define-condition-type &too-few-arguments-error &skribilo-error
too-few-arguments-error?
(proc-name too-few-arguments-error:proc-name)
(arguments too-few-arguments-error:arguments))
(define* (invalid-argument-error proc argument #:optional name)
"Raise an '&invalid-argument-error'."
(raise (condition
(&invalid-argument-error
(proc-name 'proc)
(argument argument)
(name name)))))
;;;
;;; File errors.
;;;
(define-condition-type &file-error &skribilo-error
file-error?
(file-name file-error:file-name))
(define-condition-type &file-search-error &file-error
file-search-error?
(path file-search-error:path))
(define-condition-type &file-open-error &file-error
file-open-error?)
(define-condition-type &file-write-error &file-error
file-write-error?)
;;;
;;; Adding new error conditions from other modules.
;;;
(define %external-error-condition-alist '())
(define (register-error-condition-handler! pred handler)
(set! %external-error-condition-alist
(cons (cons pred handler)
%external-error-condition-alist)))
(define (lookup-error-condition-handler c)
(let ((pair (find (lambda (pair)
(let ((pred (car pair)))
(pred c)))
%external-error-condition-alist)))
(if (pair? pair)
(cdr pair)
#f)))
;;;
;;; Convenience functions.
;;;
(define (show-stack-trace)
;; Display a backtrace to stderr if possible.
(let ((stack (make-stack #t)))
(if stack
(begin
(format (current-error-port) "~%Call stack:~%")
(display-backtrace stack (current-error-port)))
(begin
(format (current-error-port) (G_ "Call stack trace not available.~%"))
(format (current-error-port) (G_ "Use 'GUILE=\"guile --debug\" skribilo ...' for a detailed stack trace.~%"))))))
(define (abort exit-val)
;; Abort the `skribilo' command-line program, returning EXIT-VAL.
;; XXX: Whether this works depends on whether `with-exception-handler' is
;; broken, see below.
(and (string? (*destination-file*))
(false-if-exception (delete-file (*destination-file*))))
(show-stack-trace)
(exit exit-val))
(define (%call-with-skribilo-error-catch thunk exit exit-val)
(with-exception-handler
(lambda (c)
(cond ((invalid-argument-error? c)
(let ((name (invalid-argument-error:name c)))
(if name
(format (current-error-port)
(G_ "in '~a': invalid argument '~a': ~S~%")
(invalid-argument-error:proc-name c)
name
(invalid-argument-error:argument c))
(format (current-error-port)
(G_ "in '~a': invalid argument: ~S~%")
(invalid-argument-error:proc-name c)
(invalid-argument-error:argument c))))
(abort exit-val))
((too-few-arguments-error? c)
(format (current-error-port)
(G_ "in '~a': too few arguments: ~S~%")
(too-few-arguments-error:proc-name c)
(too-few-arguments-error:arguments c))
(abort exit-val))
((file-search-error? c)
(format (current-error-port)
(G_ "~a: not found in path '~S'~%")
(file-error:file-name c)
(file-search-error:path c))
(abort exit-val))
((file-open-error? c)
(format (current-error-port)
(G_ "~a: cannot open file~%")
(file-error:file-name c))
(abort exit-val))
((file-write-error? c)
(format (current-error-port)
(G_ "~a: cannot write to file~%")
(file-error:file-name c))
(abort exit-val))
((file-error? c)
(format (current-error-port)
(G_ "file error: ~a~%")
(file-error:file-name c))
(abort exit-val))
((skribilo-error? c)
(let ((handler (lookup-error-condition-handler c)))
(if (procedure? handler)
(handler c)
(format (current-error-port)
(G_ "undefined skribilo error: ~S~%")
c)))
(abort exit-val))
((message-condition? c)
(format (current-error-port) "~a~%" (condition-message c))
(abort exit-val))
(else
(format (current-error-port)
(G_ "unexpected error condition: ~A~%") c)
(abort exit-val))))
thunk))
(define-macro (call-with-skribilo-error-catch thunk)
`(call/cc (lambda (cont)
(%call-with-skribilo-error-catch ,thunk cont #f))))
(define (call-with-skribilo-error-catch/exit thunk)
(%call-with-skribilo-error-catch thunk primitive-exit 1))
;;;
;;; SRFI-34 replacement.
;;;
(define (with-exception-handler handler thunk)
;; Work around a "bug" in `with-exception-handler' in Guile up to 1.8.5.
;; See http://thread.gmane.org/gmane.lisp.guile.user/6969 for details.
;; XXX: This code is useless for 1.8.6 and later.
(with-throw-handler 'srfi-34
thunk
(lambda (key obj)
(handler obj))))
;;; conditions.scm ends here
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