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-rw-r--r--src/guile/skribilo/engine.scm5
-rw-r--r--src/guile/skribilo/writer.scm21
2 files changed, 15 insertions, 11 deletions
diff --git a/src/guile/skribilo/engine.scm b/src/guile/skribilo/engine.scm
index 0c3f406..3e05571 100644
--- a/src/guile/skribilo/engine.scm
+++ b/src/guile/skribilo/engine.scm
@@ -333,11 +333,12 @@ otherwise the requested engine is returned."
(skribe-error ident "Illegal options" opt))
;; check the correctness of the predicate
- (check-procedure "predicate" pred 2)
+ (if pred
+ (check-procedure "predicate" pred 2))
;; check the correctness of the validation proc
(if valid
- (check-procedure "validate" valid 2))
+ (check-procedure "validate" valid 2))
;; check the correctness of the three actions
(check-output "before" before)
diff --git a/src/guile/skribilo/writer.scm b/src/guile/skribilo/writer.scm
index 62fa8b0..b46cddc 100644
--- a/src/guile/skribilo/writer.scm
+++ b/src/guile/skribilo/writer.scm
@@ -89,13 +89,12 @@
(define (make-writer-predicate markup predicate class)
- (let* ((t1 (if (symbol? markup)
- (lambda (n e) (is-markup? n markup))
- (lambda (n e) #t)))
- (t2 (if class
+ (define (%always-true n e) #t)
+
+ (let* ((t2 (if class
(lambda (n e)
- (and (t1 n e) (equal? (markup-class n) class)))
- t1)))
+ (and (equal? (markup-class n) class)))
+ #f)))
(if predicate
(cond
((not (procedure? predicate))
@@ -107,8 +106,10 @@
"Illegal predicate arity (2 arguments expected)"
predicate))
(else
- (lambda (n e)
- (and (t2 n e) (predicate n e)))))
+ (if (procedure? t2)
+ (lambda (n e)
+ (and (t2 n e) (predicate n e)))
+ predicate)))
t2)))
@@ -167,7 +168,9 @@
(define (matching-writer writers)
(find (lambda (w)
(let ((pred (slot-ref w 'pred)))
- (pred node e)))
+ (if (procedure? pred)
+ (pred node e)
+ #t)))
writers))
(let* ((writers (slot-ref e 'writers))