feat: split extras by features

README.md

@@ -43,6 +43,10 @@ Idea came from puppet's hiera.
 
 ```sh
 pip install himl
+# or, optionally install with all extras dependencies: vault and aws interpolation support
+pip install himl[extras]
+# or, specify which extras dependencies you need
+pip install himl[vault,aws]
 ```
 
 ### Using `docker` image

setup.py

@@ -15,10 +15,18 @@
     'backports.functools_lru_cache==1.6.6',
     'pathlib2==2.3.7.post1',
     'pyyaml==6.0.1',
-    'boto3==1.28.12',
-    'hvac==1.1.1'
 ]
 
+_extras_require = {
+    'aws': [
+        'boto3==1.28.12',
+    ],
+    'vault': [
+        'hvac==1.1.1',
+    ],
+}
+_extras_require['extras'] = [dep for deps in _extras_require.values() for dep in deps]
+
 setup(
     name='himl',
     version="0.15.0",
@@ -54,6 +62,7 @@
     packages=['himl'],
     include_package_data=True,
     install_requires=_install_requires,
+    extras_require=_extras_require,
     entry_points={
         'console_scripts': [
             'himl = himl.main:run',