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git-mergetool--lib.sh: add error message for unknown tool variant
In setup_tool, we check if the given tool is a known variant of a tool, and quietly return with an error if not. This leads to the following invocation quietly failing: git mergetool --tool=vimdiff4 Add an error message before returning in this case. Signed-off-by: Philippe Blain <levraiphilippeblain@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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@ -264,6 +264,7 @@ setup_tool () {
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if ! list_tool_variants | grep -q "^$tool$"
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then
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echo "error: unknown tool variant '$tool'" >&2
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return 1
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fi
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