Resolve #1750. You can now save IFCs under a relative path to your Blend file.

src/blenderbim/blenderbim/bim/ifc.py

@@ -16,6 +16,7 @@
 # You should have received a copy of the GNU General Public License
 # along with BlenderBIM Add-on.  If not, see <http://www.gnu.org/licenses/>.
 
+import os
 import bpy
 import uuid
 import zipfile
@@ -62,6 +63,8 @@ class IfcStore:
     def get_file():
         if IfcStore.file is None:
             IfcStore.path = bpy.context.scene.BIMProperties.ifc_file
+            if not os.path.isabs(IfcStore.path):
+                IfcStore.path = os.path.abspath(os.path.join(bpy.path.abspath("//"), IfcStore.path))
             if IfcStore.path:
                 try:
                     IfcStore.load_file(IfcStore.path)

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

@@ -55,7 +55,8 @@ classes = (
 
 
 def menu_func_export(self, context):
-    self.layout.operator(operator.ExportIFC.bl_idname, text="Industry Foundation Classes (.ifc/.ifczip/.ifcjson)")
+    op = self.layout.operator(operator.ExportIFC.bl_idname, text="Industry Foundation Classes (.ifc/.ifczip/.ifcjson)")
+    op.should_save_as = False
 
 
 def menu_func_import(self, context):

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

@@ -741,6 +741,7 @@ class ExportIFC(bpy.types.Operator):
     json_version: bpy.props.EnumProperty(items=[("4", "4", ""), ("5a", "5a", "")], name="IFC JSON Version")
     json_compact: bpy.props.BoolProperty(name="Export Compact IFCJSON", default=False)
     should_save_as: bpy.props.BoolProperty(name="Should Save As", default=False)
+    use_relative_path: bpy.props.BoolProperty(name="Use Relative Path", default=False)
 
     def invoke(self, context, event):
         if not IfcStore.get_file():
@@ -748,6 +749,8 @@ class ExportIFC(bpy.types.Operator):
             return {"FINISHED"}
         if context.scene.BIMProperties.ifc_file and not self.should_save_as:
             self.filepath = context.scene.BIMProperties.ifc_file
+            if not os.path.isabs(self.filepath):
+                self.filepath = os.path.abspath(os.path.join(bpy.path.abspath("//"), self.filepath))
             return self.execute(context)
         if not self.filepath:
             self.filepath = bpy.path.ensure_ext(bpy.data.filepath, ".ifc")
@@ -790,7 +793,9 @@ class ExportIFC(bpy.types.Operator):
         if not scene.DocProperties.ifc_files:
             new = scene.DocProperties.ifc_files.add()
             new.name = output_file
-        if not scene.BIMProperties.ifc_file or self.should_save_as:
+        if self.use_relative_path and bpy.data.is_saved:
+            output_file = os.path.relpath(output_file, bpy.path.abspath("//"))
+        if scene.BIMProperties.ifc_file != output_file:
             scene.BIMProperties.ifc_file = output_file
         if bpy.data.is_saved and bpy.data.is_dirty and bpy.data.filepath:
             bpy.ops.wm.save_mainfile(filepath=bpy.data.filepath)

src/blenderbim/test/bim/feature/project.feature

@@ -324,7 +324,7 @@ Scenario: Export IFC - with basic contents
     Given an empty Blender session
     And I press "bim.load_project(filepath='{cwd}/test/files/basic.ifc')"
     When I press "export_ifc.bim(filepath='{cwd}/test/files/export.ifc')"
-    Then "scene.BIMProperties.ifc_file" is "{cwd}/test/files/basic.ifc"
+    Then "scene.BIMProperties.ifc_file" is "{cwd}/test/files/export.ifc"
 
 Scenario: Export IFC - with basic contents and saving as another file
     Given an empty Blender session
@@ -332,6 +332,13 @@ Scenario: Export IFC - with basic contents and saving as another file
     When I press "export_ifc.bim(filepath='{cwd}/test/files/export.ifc', should_save_as=True)"
     Then "scene.BIMProperties.ifc_file" is "{cwd}/test/files/export.ifc"
 
+Scenario: Export IFC - with basic contents and saving as a relative path
+    Given an empty Blender session
+    And I press "bim.load_project(filepath='{cwd}/test/files/basic.ifc')"
+    When I press "wm.save_mainfile(filepath='{cwd}/test/files/export.blend')"
+    And I press "export_ifc.bim(filepath='{cwd}/test/files/export.ifc', use_relative_path=True)"
+    Then "scene.BIMProperties.ifc_file" is "export.ifc"
+
 Scenario: Export IFC - with deleted objects synchronised
     Given an empty IFC project
     When the object "IfcBuildingStorey/My Storey" is selected