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mergetool--lib: create gui_mode function
Before, in `get_configured_merge_tool`, we would test the value of the first argument directly, which corresponded to whether we were using guitool. However, since `$GIT_MERGETOOL_GUI` is available as an environment variable, create the `gui_mode` function which increases the clarify of functions which use it. While we're at it, add a space before `()` in function definitions to fix the style. Signed-off-by: Denton Liu <liu.denton@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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