Consolidate handling of resources paths

* constants.py should remain the central place where a root path
   is determined based on source file location
 * SerenaPaths should consistently use strings

src/serena/config/serena_config.py

@@ -26,6 +26,7 @@ from serena.constants import (
     PROJECT_LOCAL_TEMPLATE_FILE,
     PROJECT_TEMPLATE_FILE,
     REPO_ROOT,
+    RESOURCES_DIR,
     SERENA_CONFIG_TEMPLATE_FILE,
     SERENA_FILE_ENCODING,
     SERENA_MANAGED_DIR_NAME,
@@ -61,9 +62,10 @@ class SerenaPaths:
             home_dir = str(Path.home() / SERENA_MANAGED_DIR_NAME)
         else:
             home_dir = home_dir.strip()
-        self.serena_pkg_path = Path(__file__).parent.parent.resolve()
-        self.serena_resources_path = self.serena_pkg_path / "resources"
-
+        self.resources_dir: str = RESOURCES_DIR
+        """
+        the resources directory (within the `serena` package) 
+        """
         self.serena_user_home_dir: str = home_dir
         """
         the path to the Serena home directory, where the user's configuration/data is stored.
@@ -128,6 +130,9 @@ class SerenaPaths:
         self.last_returned_log_file_path = os.path.join(log_dir, prefix + "_" + datetime_tag() + f"_{os.getpid()}" + ".txt")
         return self.last_returned_log_file_path
 
+    def get_resource_path(self, *path_elems: str) -> Path:
+        return Path(os.path.join(self.resources_dir, *path_elems))
+
     # TODO: Paths from constants.py should be moved here
 
 

src/serena/constants.py

@@ -2,20 +2,22 @@ from pathlib import Path
 
 _repo_root_path = Path(__file__).parent.parent.parent.resolve()
 _serena_pkg_path = Path(__file__).parent.resolve()
+_resources_path = _serena_pkg_path / "resources"
 
 SERENA_MANAGED_DIR_NAME = ".serena"
 
 # TODO: Path-related constants should be moved to SerenaPaths; don't add further constants here.
 REPO_ROOT = str(_repo_root_path)
-PROMPT_TEMPLATES_DIR_INTERNAL = str(_serena_pkg_path / "resources" / "config" / "prompt_templates")
-SERENAS_OWN_CONTEXT_YAMLS_DIR = str(_serena_pkg_path / "resources" / "config" / "contexts")
+RESOURCES_DIR = str(_resources_path)
+PROMPT_TEMPLATES_DIR_INTERNAL = str(_resources_path / "config" / "prompt_templates")
+SERENAS_OWN_CONTEXT_YAMLS_DIR = str(_resources_path / "config" / "contexts")
 """The contexts that are shipped with the Serena package, i.e. the default contexts."""
-SERENAS_OWN_MODE_YAMLS_DIR = str(_serena_pkg_path / "resources" / "config" / "modes")
+SERENAS_OWN_MODE_YAMLS_DIR = str(_resources_path / "config" / "modes")
 """The modes that are shipped with the Serena package, i.e. the default modes."""
-INTERNAL_MODE_YAMLS_DIR = str(_serena_pkg_path / "resources" / "config" / "internal_modes")
+INTERNAL_MODE_YAMLS_DIR = str(_resources_path / "config" / "internal_modes")
 """Internal modes, never overridden by user modes."""
-SERENA_DASHBOARD_DIR = str(_serena_pkg_path / "resources" / "dashboard")
-SERENA_ICON_DIR = str(_serena_pkg_path / "resources" / "icons")
+SERENA_DASHBOARD_DIR = str(_resources_path / "dashboard")
+SERENA_ICON_DIR = str(_resources_path / "icons")
 
 DEFAULT_SOURCE_FILE_ENCODING = "utf-8"
 """The default encoding assumed for project source files."""
@@ -24,9 +26,9 @@ DEFAULT_CONTEXT = "desktop-app"
 SERENA_FILE_ENCODING = "utf-8"
 """The encoding used for Serena's own files, such as configuration files and memories."""
 
-PROJECT_TEMPLATE_FILE = str(_serena_pkg_path / "resources" / "project.template.yml")
-PROJECT_LOCAL_TEMPLATE_FILE = str(_serena_pkg_path / "resources" / "project.local.template.yml")
-SERENA_CONFIG_TEMPLATE_FILE = str(_serena_pkg_path / "resources" / "serena_config.template.yml")
+PROJECT_TEMPLATE_FILE = str(_resources_path / "project.template.yml")
+PROJECT_LOCAL_TEMPLATE_FILE = str(_resources_path / "project.local.template.yml")
+SERENA_CONFIG_TEMPLATE_FILE = str(_resources_path / "serena_config.template.yml")
 
 SERENA_LOG_FORMAT = "%(levelname)-5s %(asctime)-15s [%(threadName)s] %(name)s:%(funcName)s:%(lineno)d - %(message)s"
 

src/serena/memories/memory_manager.py

@@ -84,7 +84,7 @@ class MemoryManager:
         return cls._MEMORY_REF_PREFIX + name
 
     MEMORY_MAINTENANCE_NAME: str = "memory_maintenance"
-    _MEMORY_MAINTENANCE_TEMPLATE_PATH: Path = SerenaPaths().serena_resources_path / "memory_maintenance.md"
+    _MEMORY_MAINTENANCE_TEMPLATE_PATH: Path = SerenaPaths().get_resource_path("memory_maintenance.md")
 
     def ensure_memory_maintenance_memory(self) -> str:
         """