You can now load, unlink, and unload links.

src/blenderbim/blenderbim/bim/module/project/__init__.py

@@ -25,6 +25,9 @@ classes = (
     operator.UnloadProject,
     operator.LoadProjectElements,
     operator.LinkIfc,
+    operator.UnlinkIfc,
+    operator.UnloadLink,
+    operator.LoadLink,
     operator.SelectLibraryFile,
     operator.ChangeLibraryElement,
     operator.RefreshLibrary,

src/blenderbim/blenderbim/bim/module/project/operator.py

@@ -642,6 +642,55 @@ class LinkIfc(bpy.types.Operator):
     filepath: bpy.props.StringProperty(subtype="FILE_PATH")
     filter_glob: bpy.props.StringProperty(default="*.blend;*.blend1", options={"HIDDEN"})
 
+    def execute(self, context):
+        new = context.scene.BIMProjectProperties.links.add()
+        new.name = self.filepath
+        bpy.ops.bim.load_link(filepath=self.filepath)
+        return {"FINISHED"}
+
+    def invoke(self, context, event):
+        context.window_manager.fileselect_add(self)
+        return {"RUNNING_MODAL"}
+
+
+class UnlinkIfc(bpy.types.Operator):
+    bl_idname = "bim.unlink_ifc"
+    bl_label = "UnLink IFC"
+    bl_options = {"REGISTER", "UNDO"}
+    filepath: bpy.props.StringProperty()
+
+    def execute(self, context):
+        bpy.ops.bim.unload_link(filepath=self.filepath)
+        index = context.scene.BIMProjectProperties.links.find(self.filepath)
+        if index != -1:
+            context.scene.BIMProjectProperties.links.remove(index)
+        return {"FINISHED"}
+
+
+class UnloadLink(bpy.types.Operator):
+    bl_idname = "bim.unload_link"
+    bl_label = "Unload Link"
+    bl_options = {"REGISTER", "UNDO"}
+    filepath: bpy.props.StringProperty()
+
+    def execute(self, context):
+        for collection in context.scene.collection.children:
+            if collection.library and collection.library.filepath == self.filepath:
+                context.scene.collection.children.unlink(collection)
+        for scene in bpy.data.scenes:
+            if scene.library and scene.library.filepath == self.filepath:
+                bpy.data.scenes.remove(scene)
+        link = context.scene.BIMProjectProperties.links.get(self.filepath)
+        link.is_loaded = False
+        return {"FINISHED"}
+
+
+class LoadLink(bpy.types.Operator):
+    bl_idname = "bim.load_link"
+    bl_label = "Load Link"
+    bl_options = {"REGISTER", "UNDO"}
+    filepath: bpy.props.StringProperty()
+
     def execute(self, context):
         with bpy.data.libraries.load(self.filepath, link=True) as (data_from, data_to):
             data_to.scenes = data_from.scenes
@@ -652,11 +701,6 @@ class LinkIfc(bpy.types.Operator):
                 if "IfcProject" not in child.name:
                     continue
                 bpy.data.scenes[0].collection.children.link(child)
-        new = context.scene.BIMProjectProperties.links.add()
-        new.name = self.filepath
-        new.is_loaded = True
+        link = context.scene.BIMProjectProperties.links.get(self.filepath)
+        link.is_loaded = True
         return {"FINISHED"}
-
-    def invoke(self, context, event):
-        context.window_manager.fileselect_add(self)
-        return {"RUNNING_MODAL"}

src/blenderbim/blenderbim/bim/module/project/ui.py

@@ -268,4 +268,12 @@ class BIM_UL_links(UIList):
     def draw_item(self, context, layout, data, item, icon, active_data, active_propname):
         if item:
             row = layout.row(align=True)
-            row.label(text=item.name, icon="CHECKMARK" if item.is_loaded else "APPEND_BLEND")
+            row.label(text=item.name)
+            if item.is_loaded:
+                op = row.operator("bim.unload_link", text="", icon="UNLINKED")
+                op.filepath=item.name
+            else:
+                op = row.operator("bim.load_link", text="", icon="LINKED")
+                op.filepath=item.name
+                op = row.operator("bim.unlink_ifc", text="", icon="X")
+                op.filepath=item.name

src/blenderbim/test/bim/bootstrap.py

@@ -155,10 +155,18 @@ def the_object_name_is_in_the_collection_collection(name, collection):
     assert collection in [c.name for c in the_object_name_exists(name).users_collection]
 
 
+def the_object_name_is_not_in_the_collection_collection(name, collection):
+    assert collection not in [c.name for c in the_object_name_exists(name).users_collection]
+
+
 def the_collection_name1_is_in_the_collection_name2(name1, name2):
     assert bpy.data.collections.get(name2).children.get(name1)
 
 
+def the_collection_name1_is_not_in_the_collection_name2(name1, name2):
+    assert not bpy.data.collections.get(name2).children.get(name1)
+
+
 def the_object_name_is_placed_in_the_collection_collection(name, collection):
     obj = the_object_name_exists(name)
     [c.objects.unlink(obj) for c in obj.users_collection]
@@ -266,7 +274,9 @@ definitions = {
     'the object "(.*)" is an "(.*)"': the_object_name_is_an_ifc_class,
     'the object "(.*)" is not an IFC element': the_object_name_is_not_an_ifc_element,
     'the object "(.*)" is in the collection "(.*)"': the_object_name_is_in_the_collection_collection,
+    'the object "(.*)" is not in the collection "(.*)"': the_object_name_is_not_in_the_collection_collection,
     'the collection "(.*)" is in the collection "(.*)"': the_collection_name1_is_in_the_collection_name2,
+    'the collection "(.*)" is not in the collection "(.*)"': the_collection_name1_is_not_in_the_collection_name2,
     "an IFC file exists": an_ifc_file_exists,
     "an IFC file does not exist": an_ifc_file_does_not_exist,
     'the object "(.*)" has a "(.*)" representation of "(.*)"': the_object_name_has_a_type_representation_of_context,

src/blenderbim/test/bim/module/project/test_operator.py

@@ -252,3 +252,38 @@ class TestLinkIFC(test.bim.bootstrap.NewFile):
         And the object "IfcBuildingStorey/Ground Floor" exists
         And the object "IfcBuildingStorey/Level 1" exists
         """
+
+
+class TestUnloadLink(test.bim.bootstrap.NewFile):
+    @test.bim.bootstrap.scenario
+    def test_unloading_a_link(self):
+        return """
+        When I press "bim.link_ifc(filepath='{cwd}/test/files/basic.blend')"
+        And I press "bim.unload_link(filepath='{cwd}/test/files/basic.blend')"
+        Then "scene.BIMProjectProperties.links['{cwd}/test/files/basic.blend'].is_loaded" is "False"
+        And "scene.collection.children.get('IfcProject/My Project')" is "None"
+        """
+
+
+class TestLoadLink(test.bim.bootstrap.NewFile):
+    @test.bim.bootstrap.scenario
+    def test_loading_a_link(self):
+        return """
+        When I press "bim.link_ifc(filepath='{cwd}/test/files/basic.blend')"
+        And I press "bim.unload_link(filepath='{cwd}/test/files/basic.blend')"
+        And I press "bim.load_link(filepath='{cwd}/test/files/basic.blend')"
+        Then "scene.BIMProjectProperties.links['{cwd}/test/files/basic.blend'].is_loaded" is "True"
+        And "scene.collection.children['IfcProject/My Project'].users" is "2"
+        """
+
+
+class TestUnlinkIFC(test.bim.bootstrap.NewFile):
+    @test.bim.bootstrap.scenario
+    def test_unlinking_an_ifc(self):
+        return """
+        When I press "bim.link_ifc(filepath='{cwd}/test/files/basic.blend')"
+        And I press "bim.unload_link(filepath='{cwd}/test/files/basic.blend')"
+        And I press "bim.unlink_ifc(filepath='{cwd}/test/files/basic.blend')"
+        Then "scene.BIMProjectProperties.links.get('{cwd}/test/files/basic.blend')" is "None"
+        And "scene.collection.children.get('IfcProject/My Project')" is "None"
+        """