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When printing --help, we'd like the name of the files from __doc__ to match the displayed positional arguments at both usage and argument description lines. Use a custom formatter class to convert ``foo`` into ANSI SGR code to bold the argument, if is TTY, and adjust the help text to match the argument names. Here on Plasma, that makes it display it colored, wich is really cool. Yet, I opted for SGR, as the best is to follow the terminal color schema for bold. Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Link: https://lore.kernel.org/r/2c1e61d1fb1b2a2838b443beee89c1528831997f.1755872208.git.mchehab+huawei@kernel.org