Description
It would be nice to have a direct command-line interface to the macro expander. expand_macros.py ARGS would be roughly equivalent to convert_project.py --expand_macros_before_conversion --dr ARGS but cleaner (e.g., not creating the convert_* scripts). I was hoping to eventually publicize the macro expander for possible reuse by projects unrelated to 3C, and a direct CLI would make that a much easier sell. We may also use the new CLI in analyse-conv and for the textual merge workflow described in #400, possibly in combination with 3c-commits / 3c-wrap. For that matter, should we even remove the convert_project --expand_macros_before_conversion option and have callers that want to perform both steps (macro expansion and 3C) call expand_macros and convert_project separately?
It looks like it would be reasonably straightforward to factor out the first part of run3C in generate_ccommands.py (which builds the list of translation units) into a new function in common.py that could be called by both run3C and expand_macros.py. The necessary command-line option parsing code could probably be factored out as well.