chore: decouple dbt-core as an ext deps

dbterd/adapters/dbt_core/dbt_invocation.py

@@ -1,11 +1,10 @@
 import os
-import importlib.util
+from importlib import util
 from importlib.metadata import version
 from pathlib import Path
 from typing import List
 
 import click
-from dbt.cli.main import dbtRunner, dbtRunnerResult
 
 from dbterd.helpers.log import logger
 
@@ -21,6 +20,8 @@ def __init__(self, dbt_project_dir: str = None, dbt_target: str = None) -> None:
             dbt_target (str, optional): Custom dbt target name. Defaults to None - using default target
         """
         self.__ensure_dbt_installed()
+        from dbt.cli.main import dbtRunner
+
         self.dbt = dbtRunner()
         self.project_dir = (
             dbt_project_dir or os.environ.get("DBT_PROJECT_DIR") or str(Path.cwd())
@@ -42,7 +43,7 @@ def __invoke(self, runner_args: List[str] = []):
         """
         args = self.__construct_arguments(*runner_args)
         logger.debug(f"Invoking: `dbt {' '.join(args)}` at {self.project_dir}")
-        r: dbtRunnerResult = self.dbt.invoke(args)
+        r = self.dbt.invoke(args)
 
         if not r.success:
             logger.error(str(r))
@@ -72,7 +73,7 @@ def __ensure_dbt_installed(self):
         Raises:
             click.UsageError: dbt is not installed
         """
-        dbt_spec = importlib.util.find_spec("dbt")
+        dbt_spec = util.find_spec("dbt")
         if dbt_spec and dbt_spec.loader:
             installed_path = dbt_spec.submodule_search_locations[0]
             logger.debug(

tests/unit/adapters/test_dbt_invocation.py

@@ -33,7 +33,7 @@ def test__ensure_dbt_installed__no_dbt_installed(self, mock_find_spec):
             ),
         ],
     )
-    @mock.patch("dbterd.adapters.dbt_core.dbt_invocation.dbtRunner.invoke")
+    @mock.patch("dbt.cli.main.dbtRunner.invoke")
     def test_get_selection(
         self,
         mock_dbtRunner_invoke,
@@ -62,15 +62,15 @@ def test_get_selection(
             ]
         )
 
-    @mock.patch("dbterd.adapters.dbt_core.dbt_invocation.dbtRunner.invoke")
+    @mock.patch("dbt.cli.main.dbtRunner.invoke")
     def test_get_selection__failed(self, mock_dbtRunner_invoke):
         mock_dbtRunner_invoke.return_value = dbtRunnerResult(success=False)
         with pytest.raises(click.UsageError):
             DbtInvocation(dbt_target="dummy").get_selection(
                 select_rules=[], exclude_rules=[]
             )
 
-    @mock.patch("dbterd.adapters.dbt_core.dbt_invocation.dbtRunner.invoke")
+    @mock.patch("dbt.cli.main.dbtRunner.invoke")
     def test_get_artifacts_for_erd(self, mock_dbtRunner_invoke):
         invoker = DbtInvocation()
         _ = invoker.get_artifacts_for_erd()