intro configuration support pkg

test_libs/config_helpers/README.md

@@ -0,0 +1,19 @@
+# ETH 2.0 config helpers
+
+`preset_loader`: A util to load constants-presets with.
+See [Constants-presets documentation](../../configs/constants_presets/README.md).
+
+Usage:
+
+```python
+configs_path = 'configs/'
+
+...
+
+import preset_loader
+from eth2spec.phase0 import spec
+my_presets = preset_loader.load_presets(configs_path, 'main_net')
+spec.apply_constants_preset(my_presets)
+```
+
+WARNING: this overwrites globals, make sure to prevent accidental collisions with other usage of the same imported specs package.

test_libs/config_helpers/preset_loader/loader.py

@@ -0,0 +1,18 @@
+from typing import Dict, Any
+
+from ruamel.yaml import (
+    YAML,
+)
+from pathlib import Path
+from os.path import join
+
+
+def load_presets(configs_dir, presets_name) -> Dict[str, Any]:
+    """
+    Loads the given preset
+    :param presets_name: The name of the generator. (lowercase snake_case)
+    :return: Dictionary, mapping of constant-name -> constant-value
+    """
+    path = Path(join(configs_dir, 'constant_presets', presets_name+'.yaml'))
+    yaml = YAML(typ='safe')
+    return yaml.load(path)

test_libs/config_helpers/requirements.txt

@@ -0,0 +1 @@
+ruamel.yaml==0.15.87

test_libs/config_helpers/setup.py

@@ -0,0 +1,9 @@
+from distutils.core import setup
+
+setup(
+    name='config_helpers',
+    packages=['preset_loader'],
+    install_requires=[
+        "ruamel.yaml==0.15.87"
+    ]
+)

test_libs/gen_helpers/setup.py

@@ -2,7 +2,6 @@ from distutils.core import setup
 
 setup(
     name='gen_helpers',
-    version='1.0',
     packages=['gen_base'],
     install_requires=[
         "ruamel.yaml==0.15.87",