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* Switch from pkg_resources to importlib.metadata
importlib.metadata is a standard library replacement for
pkg_resources, available starting with Python 3.8. It is faster than
pkg_resources. This lets the plugin interface use it when available,
i.e. on Python 3.8 and later. On earlier Python, it uses the
importlib_metadata PyPI backport if available, and finally falls back
on pkg_resources. setup.cfg gains an extra called plugins, which can
allow a project to install "pygments[plugins]" in order to ensure that
plugins support is present even if installed with older Python
versions.
Timings for lexing an empty file with a lexer from a random plugin:
Before:
real 0m0,238s
user 0m0,210s
sys 0m0,029s
After:
real 0m0,141s
user 0m0,125s
sys 0m0,017s
Fixes #2116, #2126
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