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When running it from command line, we want to write an output file, but when used as a class, one may just want the output content returned as a string. Split write_output() on two methods to allow both usecases. Also add an extra method to produce a TOC. Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Link: https://lore.kernel.org/r/c98bdec3380aad54178baf2751a2f1fcd128576b.1755872208.git.mchehab+huawei@kernel.org