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difftool: print list of valid tools with '--tool-help'
Since bc7a96a (mergetool--lib: Refactor tools into separate files, 2011-08-18), it is possible to add a new diff tool by creating a simple script in the '$(git --exec-path)/mergetools' directory. Updating the difftool help text is still a manual process, and the documentation can easily go out of sync. This commit teaches difftool the '--tool-help' option, which: - Reads the list of valid tools from 'mergetools/*' - Determines which of them are actually installed - Determines which are capable of diffing (i.e. not just a merge tool) - Prints the resulting list for the user Signed-off-by: Tim Henigan <email@example.com> Signed-off-by: Junio C Hamano <firstname.lastname@example.org>
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