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;;; debug.scm -- Debugging facilities. -*- coding: iso-8859-1 -*-
;;;
;;; Copyright 2005, 2006, 2009, 2012, 2020 Ludovic Court�s <ludo@gnu.org>
;;; Copyright 2003, 2004 Erick Gallesio - I3S-CNRS/ESSI <eg@unice.fr>
;;;
;;; 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 debug)
#:use-module (skribilo utils syntax)
#:use-module (srfi srfi-39)
#:export (debug-item debug-bold with-debug))
(skribilo-module-syntax)
;;;
;;; Parameters.
;;;
;; Current debugging level.
(define-public *debug*
(make-parameter 0 (lambda (val)
(cond ((number? val) val)
((string? val)
(string->number val))
(else
(error "*debug*: wrong argument type"
val))))))
;; Whether to use colors.
(define-public *debug-use-colors?* (make-parameter #t))
;; Where to spit debugging output.
(define-public *debug-port* (make-parameter (current-output-port)))
;; Whether to debug individual items.
(define-public *debug-item?* (make-parameter #f))
;; Watched (debugged) symbols (procedure names).
(define-public *watched-symbols* (make-parameter '()))
;;;
;;; Implementation.
;;;
(define *debug-depth* (make-parameter 0))
(define *debug-margin* (make-parameter ""))
(define *margin-level* (make-parameter 0))
;;
;; debug-port
;;
; (define (debug-port . o)
; (cond
; ((null? o)
; *debug-port*)
; ((output-port? (car o))
; (set! *debug-port* o)
; o)
; (else
; (error 'debug-port "Invalid debug port" (car o)))))
;
;;;
;;; debug-color
;;;
(define (debug-color col . o)
(with-output-to-string
(if (and (*debug-use-colors?*)
(equal? (getenv "TERM") "xterm"))
(lambda ()
(format #t "[0m[1;~Am" (+ 31 col))
(for-each display o)
(display "[0m"))
(lambda ()
(for-each display o)))))
;;;
;;; debug-bold
;;;
(define (debug-bold . o)
(apply debug-color -30 o))
;;;
;;; debug-item
;;;
(define (%do-debug-item . args)
(begin
(display (*debug-margin*) (*debug-port*))
(display (debug-color (- (*debug-depth*) 1) "- ") (*debug-port*))
(for-each (lambda (a) (display a (*debug-port*))) args)
(newline (*debug-port*))))
(define-syntax-rule (debug-item args ...)
(if (*debug-item?*)
(%do-debug-item args ...)))
;;;
;;; %with-debug-margin
;;;
(define (%with-debug-margin margin thunk)
(parameterize ((*debug-depth* (+ (*debug-depth*) 1))
(*debug-margin* (string-append (*debug-margin*) margin)))
(thunk)))
;;;
;;; %with-debug
;;;
(define (%do-with-debug lvl lbl thunk)
(parameterize ((*margin-level* lvl)
(*debug-item?* #t))
(display (*debug-margin*) (*debug-port*))
(display (if (= (*debug-depth*) 0)
(debug-color (*debug-depth*) "+ " lbl)
(debug-color (*debug-depth*) "--+ " lbl))
(*debug-port*))
(newline (*debug-port*))
(%with-debug-margin (debug-color (*debug-depth*) " |")
thunk)))
;; We have this as a macro in order to avoid procedure calls in the
;; non-debugging case. Unfortunately, the macro below duplicates BODY,
;; which has a negative impact on memory usage and startup time (XXX).
(define-syntax with-debug
(lambda (s)
(syntax-case s ()
((_ level label body ...)
(integer? (syntax->datum #'level))
#'(if (or (>= (*debug*) level)
(memq label (*watched-symbols*)))
(%do-with-debug level label (lambda () body ...))
(begin body ...))))))
; Example:
; (with-debug 0 'foo1.1
; (debug-item 'foo2.1)
; (debug-item 'foo2.2)
; (with-debug 0 'foo2.3
; (debug-item 'foo3.1)
; (with-debug 0 'foo3.2
; (debug-item 'foo4.1)
; (debug-item 'foo4.2))
; (debug-item 'foo3.3))
; (debug-item 'foo2.4))
;;; debug.scm ends here
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