fix: load schema paths from location of schema config file

lib/metanorma/plugin/lutaml/utils.rb

@@ -120,18 +120,30 @@ def load_express_from_folder(folder)
           ::Lutaml::Parser.parse(files)
         end
 
+        # TODO: Refactor this using Suma::SchemaConfig
         def load_express_from_index(document, path)
           yaml_content = YAML.safe_load(File.read(path))
-          root_path = yaml_content["path"]
-          schemas_paths = yaml_content["schemas"]
-            .map do |(schema_name, schema_values)|
-            schema_values["path"] || File.join(root_path.to_s,
-                                               "#{schema_name}.exp")
+          schema_yaml_base_path = Pathname.new(File.dirname(path))
+
+          # If there is a global root path set, all subsequent paths are
+          # relative to it.
+          if yaml_content['path']
+            root_schema_path = Pathname.new(yaml_content['path'])
+            schema_yaml_base_path = schema_yaml_base_path + root_schema_path
           end
 
-          files_to_load = schemas_paths.map do |path|
-            File.new(Utils.relative_file_path(document, path),
-                     encoding: "UTF-8")
+          files_to_load = yaml_content["schemas"].map do |key, value|
+
+            # If there is no path: set for a schema, we assume it uses the
+            # schema name as the #{filename}.exp.
+            schema_path = if value['path']
+              Pathname.new(value['path'])
+            else
+              Pathname.new("#{key}.exp")
+            end
+
+            real_schema_path = schema_yaml_base_path + schema_path
+            File.new(real_schema_path.cleanpath.to_s, encoding: "UTF-8")
           end
 
           ::Lutaml::Parser.parse(files_to_load)

spec/fixtures/lutaml/lutaml_exp_index.yaml

@@ -1,22 +1,22 @@
 ---
 schemas:
   arm_svgmap:
-    path: spec/fixtures/lutaml/expressir_index_1/arm_svgmap.exp
+    path: expressir_index_1/arm_svgmap.exp
     diagrams:
       - action_schema/action_schemaexpg1.svg
       - action_schema/action_schemaexpg2.svg
   mim_annotated:
-    path: spec/fixtures/lutaml/expressir_index_1/mim_annotated.exp
+    path: expressir_index_1/mim_annotated.exp
     diagrams:
       - application_context_schema/application_context_schemaexpg1.svg
       - application_context_schema/application_context_schemaexpg2.svg
   approval_schema:
-    path: spec/fixtures/lutaml/expressir_index_2/arm_annotated.exp
+    path: expressir_index_2/arm_annotated.exp
     diagrams:
       - approval_schema/approval_schemaexpg1.svg
       - approval_schema/approval_schemaexpg2.svg
   mim:
-    path: spec/fixtures/lutaml/expressir_index_2/mim.exp
+    path: expressir_index_2/mim.exp
     diagrams:
       - basic_attribute_schema/basic_attribute_schemaexpg1.svg
       - basic_attribute_schema/basic_attribute_schemaexpg2.svg

spec/fixtures/lutaml/lutaml_exp_index_2.yaml

@@ -1,7 +1,7 @@
 ---
 schemas:
   arm:
-    path: spec/fixtures/lutaml/expressir_index_1/arm.exp
+    path: expressir_index_1/arm.exp
     diagrams:
       - action_schema/action_schemaexpg1.svg
       - action_schema/action_schemaexpg2.svg