X-Git-Url: https://git.distorted.org.uk/~mdw/sod/blobdiff_plain/aa14a4cddcb96b681d5c19a2ec8bad382f43b264..9ec578d9fe450b7e7f9030dc9d930185593aa991:/src/module-impl.lisp

diff --git a/src/module-impl.lisp b/src/module-impl.lisp
index 753ca0a..89e1ffb 100644
--- a/src/module-impl.lisp
+++ b/src/module-impl.lisp
@@ -84,13 +84,38 @@
     (when truename
       (setf (gethash truename *module-map*) *module*))
     (unwind-protect
-	 (call-with-module-environment (lambda ()
-					 (module-import *builtin-module*)
-					 (funcall thunk)
-					 (finalize-module *module*)))
+	 (with-module-environment ()
+	   (module-import *builtin-module*)
+	   (funcall thunk)
+	   (finalize-module *module*))
       (when (and truename (not (eq (module-state *module*) t)))
 	(remhash truename *module-map*)))))
 
+(defun call-with-module-environment (thunk &optional (module *module*))
+  "Invoke THUNK with bindings for the module variables in scope.
+
+   This is the guts of `with-module-environment', which you should probably
+   use instead."
+  (progv
+      (mapcar #'car *module-bindings-alist*)
+      (module-variables module)
+    (unwind-protect (funcall thunk)
+      (setf (module-variables module)
+	    (mapcar (compose #'car #'symbol-value)
+		    *module-bindings-alist*)))))
+
+(defun call-with-temporary-module (thunk)
+  "Invoke THUNK in the context of a temporary module, returning its values.
+
+   This is mainly useful for testing things which depend on module variables.
+   This is the functionality underlying `with-temporary-module'."
+  (let ((*module* (make-instance 'module
+				 :name "<temp>"
+				 :state nil)))
+    (with-module-environment ()
+      (module-import *builtin-module*)
+      (funcall thunk))))
+
 ;;;--------------------------------------------------------------------------
 ;;; Type definitions.
 
@@ -148,7 +173,8 @@
 	     (fresh-line stream)
 	     (format stream "~&#line ~D ~S~%"
 		     (1+ (position-aware-stream-line stream))
-		     (namestring (stream-pathname stream)))))
+		     (let ((path (stream-pathname stream)))
+		       (if path (namestring path) "<sod-output>")))))
 	  (t
 	   (funcall thunk)))))