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Reimplement the `bisect_start` shell function partially in C and add `bisect-start` subcommand to `git bisect--helper` to call it from git-bisect.sh . The last part is not converted because it calls another shell function. `bisect_start` shell function will be completed after the `bisect_next` shell function is ported in C. Using `--bisect-start` subcommand is a temporary measure to port shell function in C so as to use the existing test suite. As more functions are ported, this subcommand will be retired and will be called by some other methods. Also introduce a method `bisect_append_log_quoted` to keep things short and crisp. Note that we are a bit lax about command-line parsing because the helper is not supposed to be called by the user directly (but only from the git bisect script). Helped-by: Ramsay Jones <ramsay@ramsayjones.plus.com> Helped-by: Stephan Beyer <s-beyer@gmx.net> Mentored-by: Lars Schneider <larsxschneider@gmail.com> Mentored-by: Christian Couder <chriscool@tuxfamily.org> Mentored-by: Johannes Schindelin <Johannes.Schindelin@gmx.de> Signed-off-by: Pranit Bauva <pranit.bauva@gmail.com> Signed-off-by: Tanushree Tumane <tanushreetumane@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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