[!330] Add a show_options entry point

Merge branch 'feature/show-options-entrypoint' into 'master'

See merge request [extensions/dune-codegen!330]

  [extensions/dune-codegen!330]: Noneextensions/dune-codegen/merge_requests/330

python/dune/codegen/options.py

@@ -129,6 +129,20 @@ _global_options = CodegenGlobalOptionsArray()
 _form_options = {}
 
 
+def show_options():
+    def subopt(arr):
+        for k, v in arr.__dict__.items():
+            if isinstance(v, CodegenOption) and v.helpstr is not None:
+                print("{}\n    {}".format(k, v.helpstr))
+
+    print("This is a summary of options available for the code generation process:\n")
+    print("The following options can be given in the [formcompiler] section:")
+    subopt(CodegenGlobalOptionsArray)
+
+    print("\nThefollowing options can be given in a form-specific subsection of [formcompiler]:")
+    subopt(CodegenFormOptionsArray)
+
+
 def initialize_options():
     """ Initialize the options from the command line """
     global _global_options

python/setup.py

@@ -47,5 +47,6 @@ setup(name='dune.codegen',
         "console_scripts": [
             "generate_operators = dune.codegen.compile:entry_generate_operators",
             "generate_driver = dune.codegen.compile:entry_generate_driver",
+            "show_options = dune.codegen.options:show_options",
         ]
     })