Added "automapping" feature for environment variables

Processor.php

@@ -99,7 +99,18 @@ private function processParams(array $config, array $expectedParams, array $actu
             $actualParams = array_intersect_key($actualParams, $expectedParams);
         }
 
-        $envMap = empty($config['env-map']) ? array() : (array) $config['env-map'];
+        $envMap = array();
+        // Add the params coming from the environment values
+        if (!empty($config['env-map'])) {
+            // Hydrate env-map from dist file
+            if ('auto' === $config['env-map']) {
+                foreach ($expectedParams as $key => $value) {
+                    $envMap[$key] = strtoupper($key);
+                }
+            } else {
+                $envMap = (array) $config['env-map'];
+            }
+        }
 
         // Add the params coming from the environment values
         $actualParams = array_replace($actualParams, $this->getEnvValues($envMap));

README.md

@@ -122,6 +122,35 @@ As environment variables can only be strings, they are also parsed as inline
 Yaml values to allows specifying ``null``, ``false``, ``true`` or numbers
 easily.
 
+#### Using same names for parameters and environment variables
+
+As an alternative, you can set environment variables with the same uppercased
+name of your dist parameters and use ``"env-map": "auto"`` to get an auto mapping.
+``my_first_param`` parameter will map ``MY_FIRST_PARAM`` environment variable.
+
+Given this ``parameters.yml.dist`` file:
+
+```yaml
+# parameters.yml.dist
+
+parameters:
+    my_first_param: "some value"
+    my_second_param: "another value"
+
+```
+
+Following settings will produce the same result as previous example:
+
+```json
+{
+    "extra": {
+        "incenteev-parameters": {
+            "env-map": "auto"
+        }
+    }
+}
+```
+
 ### Renaming parameters
 
 If you are renaming a parameter, the new key will be set according to the usual

Tests/fixtures/testcases/interaction_with_environment_auto/dist.yml

@@ -0,0 +1,4 @@
+parameters:
+    ic_test_bool: false
+    another: test
+    ic_test_nested: nested

Tests/fixtures/testcases/interaction_with_environment_auto/expected.yml

@@ -0,0 +1,10 @@
+# This file is auto-generated during the composer install
+parameters:
+    ic_test_bool: true
+    ic_test_nested:
+        foo: env_foo
+        bar:
+            - env
+            - test
+            - null
+    another: null

Tests/fixtures/testcases/interaction_with_environment_auto/setup.yml

@@ -0,0 +1,15 @@
+title: Values provided by the environment are not asked interactively
+
+config:
+    env-map: 'auto'
+
+environment:
+    IC_TEST_BOOL: 'true'
+    IC_TEST_NESTED: '{foo: env_foo, bar: [env, test, null]}'
+
+interactive: true
+
+requested_params:
+    another:
+        default: test
+        input: 'null'

Tests/fixtures/testcases/non_existent_with_environment_auto/dist.yml

@@ -0,0 +1,7 @@
+parameters:
+    ic_test_foo: bar
+    ic_test_bool: false
+    another: ~
+    ic_test_nested:
+        foo: bar
+        bar: baz

Tests/fixtures/testcases/non_existent_with_environment_auto/expected.yml

@@ -0,0 +1,11 @@
+# This file is auto-generated during the composer install
+parameters:
+    ic_test_foo: foobar
+    ic_test_bool: true
+    another: null
+    ic_test_nested:
+        foo: env_foo
+        bar:
+            - env
+            - test
+            - null

Tests/fixtures/testcases/non_existent_with_environment_auto/setup.yml

@@ -0,0 +1,9 @@
+title: Environment variables are used over dist file defaults
+
+config:
+    env-map: 'auto'
+
+environment:
+    IC_TEST_BOOL: 'true'
+    IC_TEST_FOO: 'foobar'
+    IC_TEST_NESTED: '{foo: env_foo, bar: [env, test, null]}'

Tests/fixtures/testcases/renamed_and_environment_auto/dist.yml

@@ -0,0 +1,3 @@
+parameters:
+    ic_test_new: bar
+    new2: new2

Tests/fixtures/testcases/renamed_and_environment_auto/existing.yml

@@ -0,0 +1,4 @@
+# This file is auto-generated during the composer install
+parameters:
+    old: old_value
+    old2: old_value2

Tests/fixtures/testcases/renamed_and_environment_auto/expected.yml

@@ -0,0 +1,4 @@
+# This file is auto-generated during the composer install
+parameters:
+    ic_test_new: new_env_value
+    new2: old_value2

Tests/fixtures/testcases/renamed_and_environment_auto/setup.yml

@@ -0,0 +1,10 @@
+title: Environment variables win over renamed keys
+
+config:
+    rename-map:
+        ic_test_new: old
+        new2: old2
+    env-map: 'auto'
+
+environment:
+    IC_TEST_NEW: 'new_env_value'