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-rw-r--r--src/guile/skribilo/engine.scm28
1 files changed, 19 insertions, 9 deletions
diff --git a/src/guile/skribilo/engine.scm b/src/guile/skribilo/engine.scm
index 83528a9..5800486 100644
--- a/src/guile/skribilo/engine.scm
+++ b/src/guile/skribilo/engine.scm
@@ -195,15 +195,30 @@
`(skribilo engine ,id))
(define (engine-loaded? id)
- (nested-ref the-root-module (engine-id->module-name id)))
+ "Check whether engine @var{id} is already loaded."
+ ;; Trick taken from `resolve-module' in `boot-9.scm'.
+ (nested-ref the-root-module
+ `(%app modules ,@(engine-id->module-name id))))
;; A mapping of engine names to hooks.
(define %engine-load-hook (make-hash-table))
+(define (consume-load-hook! id)
+ (with-debug 5 'consume-load-hook!
+ (let ((hook (hashq-ref %engine-load-hook id)))
+ (if hook
+ (begin
+ (debug-item "running hook " hook " for engine " id)
+ (hashq-remove! %engine-load-hook id)
+ (run-hook hook))))))
+
(define (when-engine-is-loaded id thunk)
"Run @var{thunk} only when engine with identifier @var{id} is loaded."
(if (engine-loaded? id)
- (thunk)
+ (begin
+ ;; Maybe the engine had already been loaded via `use-modules'.
+ (consume-load-hook! id)
+ (thunk))
(let ((hook (or (hashq-ref %engine-load-hook id)
(let ((hook (make-hook)))
(hashq-set! %engine-load-hook id hook)
@@ -219,15 +234,10 @@ otherwise the requested engine is returned."
(debug-item "id=" id " version=" version)
(let* ((engine (symbol-append id '-engine))
- (m (resolve-module (engine-id->module-name id)))
- (hook (hashq-ref %engine-load-hook id)))
+ (m (resolve-module (engine-id->module-name id))))
(if (module-bound? m engine)
(let ((e (module-ref m engine)))
- (if (and e hook)
- (begin
- ;; consume the hook
- (run-hook hook)
- (hashq-remove! %engine-load-hook id)))
+ (if e (consume-load-hook! id))
e)
(error "no such engine" id)))))