Makefile: add a knob to enable the use of Asciidoctor
While Git has traditionally built its documentation using AsciiDoc, some people wish to use Asciidoctor for speed or other reasons. Add a Makefile knob, USE_ASCIIDOCTOR, that sets various options in order to produce acceptable output. For HTML output, XHTML5 was chosen, since the AsciiDoc options also produce XHTML, albeit XHTML 1.1. Asciidoctor does not have built-in support for the linkgit macro, but it is available using the Asciidoctor Extensions Lab. Add a macro to enable the use of this extension if it is available. Without it, the linkgit macros are emitted into the output. Signed-off-by: Nbrian m. carlson <sandals@crustytoothpaste.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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