we'll need this for internal wire message formats. also disambiguates
from 'bolt message optional fields', which we rename to extensions here.
example of an optional field declaration (note the ? prefixing the
type):
msgdata,msg_name,field_name,?type,count
these are handled with either a boolean if they're not present,
or a true value and then the object if they are.
if there are any comments that aren't "attached" to a message,
print them at the top of the generated file. we need this for
the fancy auto-gen'd dependencies in the tool-wiregen tests.
the RFC's extract-format.py is switching to a new format.
this script can correctly parse them.
mostly moves logic over from generate-wire.py, uses a
Python formatting libarary called mako, which needs to be
installed prior to running this script.
you can add it to your system with
sudo apt-get install python3-mako
lisa neigut