[GSoC 2020]: Need help in writing sed alternative in Python for RSB recipes

[Mritunjay Sharma]

Hello everyone,

Based on the input received by Gedare, I have started working
on finding a 'sed' alternative to be used in the RSB recipes to
do streamline text replacements.

I have gone through the Python Development Guidelines (
https://docs.rtems.org/branches/master/eng/python-devel.html)
and have installed the things suggested in this for the development
environment.

To start with the research work, I found this interesting
the discussion here
https://unix.stackexchange.com/questions/13711/differences-between-sed-on-mac-osx-and-other-standard-sed
that
gave me an idea
on how sed differs in BSD and UNIX platforms.

I learnt about differences like:
`OS X's sed uses -E for ERE and GNU sed uses -r. -E is an alias for -r in
GNU sed (added in 4.2, not documented until 4.3). Newer versions of FreeBSD
and NetBSD sed support both -E and -r. OpenBSD sed only supports -E.
`

I also found a similar project https://github.com/chmln/sd which can help
us in
developing the Python code needed in our case.

I would request the mentors to guide me on how and where to begin from
in writing this alternative?
Where do I have to write it? Is it the rtems-tools project (
https://github.com/RTEMS/rtems-tools) where I have to contribute to for
building this alternative?

Thanks
Mritunjay Sharma
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