Add --strip-extras feature to wrap pip-compile flag

docs/features.rst

@@ -35,6 +35,8 @@ Features
 
 .. automodule:: pipcompilemulti.features.skip_constraint_comments
 
+.. automodule:: pipcompilemulti.features.strip_extras
+
 .. automodule:: pipcompilemulti.features.live_output
 
 .. automodule:: pipcompilemulti.verify

pipcompilemulti/features/controller.py

@@ -19,6 +19,7 @@
 from .limit_in_paths import LimitInPaths
 from .live_output import LiveOutput
 from .skip_constraint_comments import SkipConstraintComments
+from .strip_extras import StripExtras
 from .unsafe import AllowUnsafe
 from .upgrade import UpgradeAll, UpgradeSelected
 from .use_cache import UseCache
@@ -47,6 +48,7 @@ def __init__(self):
         self.live_output = LiveOutput()
         self.output_extension = OutputExtension()
         self.skip_constraint_comments = SkipConstraintComments()
+        self.strip_extras = StripExtras()
         self.upgrade_all = UpgradeAll(self)
         self.upgrade_selected = UpgradeSelected(self)
         self.use_cache = UseCache()
@@ -69,6 +71,7 @@ def __init__(self):
             self.live_output,
             self.output_extension,
             self.skip_constraint_comments,
+            self.strip_extras,
             self.upgrade_all,
             self.upgrade_selected,
             self.use_cache,
@@ -100,6 +103,7 @@ def pin_options(self, in_path):
         options.extend(self.upgrade_all.pin_options())
         options.extend(self.upgrade_selected.pin_options())
         options.extend(self.use_cache.pin_options())
+        options.extend(self.strip_extras.pin_options())
         return options
 
     def compose_input_file_path(self, basename):

pipcompilemulti/features/strip_extras.py

@@ -0,0 +1,26 @@
+"""
+Strip extras
+============
+
+Instructs ``pip-compile`` to attempt to omit extras in transient dependencies,
+while assuring the constraints compatibility.
+
+.. code-block:: text
+
+    --strip-extras          Try avoiding use of extras.
+"""
+from .base import ClickOption
+from .forward import ForwardOption
+
+
+class StripExtras(ForwardOption):
+    """Attempt to drop extras"""
+
+    OPTION_NAME = 'strip_extras'
+    CLICK_OPTION = ClickOption(
+        long_option='--strip-extras',
+        is_flag=True,
+        default=False,
+        help_text='Try avoiding use of extras.'
+    )
+    enabled_pin_options = ['--strip-extras']