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;;; User interface messages
;; Copyright (C) 2009 Free Software Foundation, Inc.
;;; This library is free software; you can redistribute it and/or
;;; modify it under the terms of the GNU Lesser General Public
;;; License as published by the Free Software Foundation; either
;;; version 3 of the License, or (at your option) any later version.
;;;
;;; This library 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
;;; Lesser General Public License for more details.
;;;
;;; You should have received a copy of the GNU Lesser General Public
;;; License along with this library; if not, write to the Free Software
;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
;;; Commentary:
;;;
;;; This module provide a simple interface to send messages to the user.
;;; TODO: Internationalize messages.
;;;
;;; Code:
(define-module (system base message)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-9)
#:export (*current-warning-port* warning
warning-type? warning-type-name warning-type-description
warning-type-printer lookup-warning-type
%warning-types))
;;;
;;; Source location
;;;
(define (location-string loc)
(if (pair? loc)
(format #f "~a:~a:~a"
(or (assoc-ref loc 'filename) "<stdin>")
(1+ (assoc-ref loc 'line))
(assoc-ref loc 'column))
"<unknown-location>"))
;;;
;;; Warnings
;;;
(define *current-warning-port*
;; The port where warnings are sent.
(make-fluid))
(fluid-set! *current-warning-port* (current-error-port))
(define-record-type <warning-type>
(make-warning-type name description printer)
warning-type?
(name warning-type-name)
(description warning-type-description)
(printer warning-type-printer))
(define %warning-types
;; List of know warning types.
(map (lambda (args)
(apply make-warning-type args))
`((unsupported-warning ;; a "meta warning"
"warn about unknown warning types"
,(lambda (port unused name)
(format port "warning: unknown warning type `~A'~%"
name)))
(unused-variable
"report unused variables"
,(lambda (port loc name)
(format port "~A: warning: unused variable `~A'~%"
loc name))))))
(define (lookup-warning-type name)
"Return the warning type NAME or `#f' if not found."
(find (lambda (wt)
(eq? name (warning-type-name wt)))
%warning-types))
(define (warning type location . args)
"Emit a warning of type TYPE for source location LOCATION (a source
property alist) using the data in ARGS."
(let ((wt (lookup-warning-type type))
(port (fluid-ref *current-warning-port*)))
(if (warning-type? wt)
(apply (warning-type-printer wt)
port (location-string location)
args)
(format port "~A: unknown warning type `~A': ~A~%"
(location-string location) type args))))
;;; message.scm ends here
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