From a5b8c2cfaf31b5d81a900b1020eb45252d775dd0 Mon Sep 17 00:00:00 2001
From: Ludovic Courtes
Date: Sat, 25 Nov 2006 17:37:51 +0000
Subject: lout: bib-ref+: Gracefully handle `unref' objects.

* src/guile/skribilo/engine/lout.scm (bib-ref+)[canonicalize-entry]:
  Handle `unref' objects.
  [help-proc]: Don't pass `unref' objects to PROC.

git-archimport-id: skribilo@sv.gnu.org--2006/skribilo--devo--1.2--patch-17
---
 src/guile/skribilo/engine/lout.scm | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

(limited to 'src')

diff --git a/src/guile/skribilo/engine/lout.scm b/src/guile/skribilo/engine/lout.scm
index db93257..272b131 100644
--- a/src/guile/skribilo/engine/lout.scm
+++ b/src/guile/skribilo/engine/lout.scm
@@ -2495,6 +2495,7 @@
 					   ((is-markup? x 'bib-entry) x)
 					   ((is-markup? x 'bib-ref)
 					    (handle-ast (markup-body x)))
+                                           ((is-markup? x 'unref) #f)
 					   (else
 					    (skribe-error
 					     'lout
@@ -2502,9 +2503,14 @@
 					     x)))))
 		    (help-proc (lambda (proc)
 				 (lambda (e1 e2)
-				   (proc (canonicalize-entry e1)
-					 (canonicalize-entry e2)))))
+                                   (let ((e1 (canonicalize-entry e1))
+                                         (e2 (canonicalize-entry e2)))
+                                     ;; don't pass `unref's to PROC
+                                     (if (and e1 e2)
+                                         (proc e1 e2)
+                                         #f)))))
 		    (sort-proc (engine-custom e 'bib-refs-sort-proc)))
+
 	       (let loop ((rs (if sort-proc
 				  (sort entries (help-proc sort-proc))
 				  entries)))
-- 
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