load ressources (e.g. models) not only based on current direcory

Closes: #101

pycam/Utils/locations.py

@@ -61,8 +61,12 @@ def get_ui_file_location(filename, silent=False):
     return get_data_file_location(os.path.join(UI_SUBDIR, filename), silent=silent)
 
 
-def get_data_file_location(filename, silent=False):
-    for base_dir in DATA_BASE_DIRS:
+def get_data_file_location(filename, silent=False, priority_directories=None):
+    if priority_directories is None:
+        scan_dirs = DATA_BASE_DIRS
+    else:
+        scan_dirs = tuple(priority_directories) + tuple(DATA_BASE_DIRS)
+    for base_dir in scan_dirs:
         test_path = os.path.join(base_dir, filename)
         if os.path.exists(test_path):
             return test_path

pycam/workspace/data_models.py

@@ -43,6 +43,7 @@
 from pycam.Utils import get_application_key, get_type_name, MultiLevelDictionaryAccess
 from pycam.Utils.events import get_event_handler
 from pycam.Utils.progress import ProgressContext
+from pycam.Utils.locations import get_data_file_location
 import pycam.Utils.log
 from pycam.workspace import (
     BoundsSpecification, CollectionName, FormatType, GCodeDialect, ModelScaleTarget,
@@ -670,6 +671,18 @@ def _get_source_copy(self, related_collection_name):
     def _get_source_location(self, source_type):
         location = self.get_value("location")
         if source_type == SourceType.FILE:
+            if not os.path.isabs(location):
+                # try to guess the absolute location
+                # TODO: add the directory of the most recently loaded workspace file
+                # guess the git base directory
+                git_checkout_dir = os.path.join(os.path.dirname(__file__),
+                                                os.path.pardir, os.path.pardir)
+                search_directories = [os.getcwd(), git_checkout_dir]
+                abs_location = get_data_file_location(location, silent=True,
+                                                      priority_directories=search_directories)
+                # hopefully it worked - otherwise normal error handling will happen
+                if abs_location is not None:
+                    location = abs_location
             location = "file://" + os.path.abspath(location)
         detected_filetype = detect_file_type(location)
         if detected_filetype: