From d89343bf6959e8a0f9bf891a8773daf6b8a9825b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hugo=20H=C3=B6rnquist?= <hugo@hornquist.se>
Date: Fri, 8 Mar 2019 10:12:04 +0100
Subject: Add copy-vevent.

---
 guile_interface.scm.c   | 17 +++++++++++++++++
 vcal.h                  | 15 +++++++++++++++
 vcalendar.scm           |  3 +--
 vcalendar/primitive.scm |  4 +++-
 4 files changed, 36 insertions(+), 3 deletions(-)

diff --git a/guile_interface.scm.c b/guile_interface.scm.c
index 2dcff513..a134848d 100644
--- a/guile_interface.scm.c
+++ b/guile_interface.scm.c
@@ -177,6 +177,23 @@ SCM_DEFINE(vcomponent_attr_list, "%vcomponent-attribute-list", 1, 0, 0,
 	return llist;
 }
 
+SCM_DEFINE(vcomponent_shallow_copy, "%vcomponent-shallow-copy", 1, 0, 0,
+           (SCM component),
+           "Creates a shallow copy of the given component.")
+{
+	scm_assert_foreign_object_type (vcomponent_type, component);
+	vcomponent* src = scm_foreign_object_ref (component, 0);
+
+	vcomponent* dest =
+		(vcomponent*) scm_gc_malloc (
+				sizeof(*dest), "vcomponent");
+	INIT(vcomponent, dest, src->type, NULL);
+
+	vcomponent_copy (dest, src);
+	return scm_make_foreign_object_1
+		(vcomponent_type, dest);
+}
+
 void init_lib (void) {
 	init_vcomponent_type();
 
diff --git a/vcal.h b/vcal.h
index 798a00a1..1dfc5b17 100644
--- a/vcal.h
+++ b/vcal.h
@@ -73,6 +73,11 @@ struct s_vcomponent {
 	TRIE(content_line) clines;
 	LLIST(vcomponent) components;
 
+	/*
+	 * Holds a Guile representation of this object. Used to always
+	 * return the same foreign (for guile) object for the same
+	 * vcomponent.
+	 */
 	SCM scm;
 };
 
@@ -96,8 +101,18 @@ char* vcomponent_get_val (vcomponent*, const char* key);
  */
 int PUSH(vcomponent)(vcomponent*, vcomponent*);
 
+/*
+ * Deep copy is currently not implemented for vcomponentes.
+ * The reason for this method being here is since some
+ * generic methods in other places complain otherwise.
+ */
 int DEEP_COPY(vcomponent)(vcomponent*, vcomponent*);
 
+/*
+ * "Shallow" copy of vcomponent.
+ */
+int vcomponent_copy(vcomponent*, vcomponent*);
+
 FMT_F(vcomponent);
 
 #endif /* VCAL_H */
diff --git a/vcalendar.scm b/vcalendar.scm
index 603aefea..89dd682b 100644
--- a/vcalendar.scm
+++ b/vcalendar.scm
@@ -59,5 +59,4 @@
         (transformer (attr ev field))))
 
 
-
-
+(define-public copy-vcomponent %vcomponent-shallow-copy)
diff --git a/vcalendar/primitive.scm b/vcalendar/primitive.scm
index b4ba1f38..e575115c 100644
--- a/vcalendar/primitive.scm
+++ b/vcalendar/primitive.scm
@@ -12,7 +12,9 @@
             %vcomponent-set-attribute!
             %vcomponent-get-attribute
 
-            %vcomponent-attribute-list))
+            %vcomponent-attribute-list
+
+            %vcomponent-shallow-copy))
 
 (setenv "LD_LIBRARY_PATH" (dirname (dirname (current-filename))))
 (load-extension "libguile-calendar" "init_lib")
-- 
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