On Fri, 8 Mar 2024, Even Rouault via gdal-dev wrote:
Hi,
Our command line C++ utilities use ad-hoc manual parsing, which means that:
- the usage message must be manually composed,
- you must take care to check that there are enough remaining arguments for
the ones that take value to avoid out-of-bounds accesses (tests like argc + 1
< argn)
- detection for duplicated arguments when only a single occurrence is allowed
must be manually done, nd thus is often not done, confusing users, cf
https://github.com/OSGeo/gdal/issues/9415
- etc.
I've come across https://github.com/p-ranav/argparse which fit all my
requirements at first sight: compatible with our C++ requirements (C++17),
MIT license, easily usable (single header), well documented, and enough
feature-full. From a quick testing, it seems to work well. It looks also as
it has taken some inspiration from the Python argparse module.
I'd be tempted to give that a try to retrofit our existing utilities
(probably starting with the ones with the less options :-)). Opinions? I
guess there must be a plethora of similar projects, due to the absence of a
std::argparse module... At least I see it is in the list of (9) alternatives
mentioned at
https://en.cppreference.com/w/cpp/links/libs?source=post_page---------------------------#Configuration:Command_Line
Some options have related environment variables, eg --debug /CPL_DEBUG.
Options are also passed through to several drivers.
I assume that the implications for these are not significant ?
--
Andrew C. Aitchison Kendal, UK
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