Improve checking for C99-style varargs macros.

[sod] / src / module-output.lisp

diff --git a/src/module-output.lisp b/src/module-output.lisp
index a0ca42d..1bfb34f 100644 (file)
--- a/src/module-output.lisp
+++ b/src/module-output.lisp
@@ -65,6 +65,20 @@
   (merge-pathnames (make-pathname :type type :case :common)
                   (module-name module)))
 
+(defvar *done-one-off-output* nil
+  "A list of tokens for things which should appear at most once in output.")
+
+(export 'one-off-output)
+(defun one-off-output (token sequencer item-name function)
+  "Arrange to output a thing at most once.
+
+   If there has been no previous call to `one-off-output' with the given
+   TOKEN during this output run, then arrange to call FUNCTION when the item
+   called ITEM-NAME is traversed.  Otherwise do nothing."
+  (unless (member token *done-one-off-output*)
+    (push token *done-one-off-output*)
+    (add-sequencer-item-function sequencer item-name function)))
+
 ;;;--------------------------------------------------------------------------
 ;;; Main output interface.
 
@@ -73,7 +87,8 @@
   "Write the MODULE to STREAM, giving the output machinery the REASON.
 
    This is the top-level interface for producing output."
-  (let ((sequencer (make-instance 'sequencer))
+  (let ((*done-one-off-output* nil)
+       (sequencer (make-instance 'sequencer))
        (stream (if (typep stream 'position-aware-output-stream)
                    stream
                    (make-instance 'position-aware-output-stream
@@ -112,7 +127,7 @@
     (:prologue
      (:guard :start)
      (:typedefs :start) :typedefs (:typedefs :end)
-     (:includes :start) :includes (:includes :end)
+     (:includes :start) :includes :early-decls (:includes :end)
      (:early-user :start) :early-user (:early-user :end)
      (:classes :start) (:classes :end)
      (:user :start) :user (:user :end)