git-fmt-merge-msg: make it usable from other builtins
Move all functionality (except config and option parsing) from cmd_fmt_merge_msg() to fmt_merge_msg(), so that other builtins can use it without a child process. All functions have been changed to use strbufs, and now only cmd_fmt_merge_msg() reads directly from a file / writes anything to stdout. Signed-off-by: NMiklos Vajna <vmiklos@frugalware.org> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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