Respect user defined environment variables for context formatting

Author: ofek

docs/history.md

@@ -34,6 +34,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - The `env show`, `dep hash`, and all `dep show` commands now honor context formatting
 - Decreasing verbosity now has no affect on output that should always be displayed
 - Handle more edge cases in the `setuptools` migration script
+- Environments now respect user defined environment variables for context formatting
 - Allow `extra-dependencies` in environment overrides
 - Depend on `packaging` explicitly rather than relying on it being a transitive dependency of Hatchling
 

src/hatch/env/plugin/interface.py

@@ -274,7 +274,7 @@ def environment_dependencies_complex(self):
             from packaging.requirements import InvalidRequirement, Requirement
 
             dependencies_complex = []
-            with self.metadata.context.apply_context(self.context):
+            with self.apply_context():
                 for option in ('dependencies', 'extra-dependencies'):
                     dependencies = self.config.get(option, [])
                     if not isinstance(dependencies, list):
@@ -758,7 +758,7 @@ def expand_command(self, command):
         if not args:
             args = None
 
-        with self.metadata.context.apply_context(self.context):
+        with self.apply_context():
             if possible_script in self.scripts:
                 for cmd in self.scripts[possible_script]:
                     yield self.metadata.context.format(cmd, args=args).strip()
@@ -879,6 +879,11 @@ def get_option_types() -> dict:
         """
         return {}
 
+    @contextmanager
+    def apply_context(self):
+        with self.get_env_vars(), self.metadata.context.apply_context(self.context):
+            yield
+
     def __enter__(self):
         self.activate()
         return self

tests/env/plugin/test_interface.py

@@ -1159,3 +1159,26 @@ def test_matrix_default_override(self, isolation, data_dir, platform):
         )
 
         assert environment.dependencies == ['pkg==42']
+
+    def test_env_vars_override(self, isolation, data_dir, platform):
+        config = {
+            'project': {'name': 'my_app', 'version': '0.0.1'},
+            'tool': {
+                'hatch': {
+                    'envs': {
+                        'default': {
+                            'dependencies': ['pkg{env:DEP_PIN}'],
+                            'env-vars': {'DEP_PIN': '==0.0.1'},
+                            'overrides': {'env': {'DEP_ANY': {'env-vars': 'DEP_PIN='}}},
+                        },
+                    },
+                },
+            },
+        }
+        with EnvVars({'DEP_ANY': 'true'}):
+            project = Project(isolation, config=config)
+            environment = MockEnvironment(
+                isolation, project.metadata, 'default', project.config.envs['default'], {}, data_dir, platform, 0
+            )
+
+            assert environment.dependencies == ['pkg']