serveronly: give the sub extension a way to access to the 'evolve' module We keep it as clean as possible but if the extension is specified with a direct path, we have to be a bit hacky. Being able to access the whole evolve extension from the 'serveronly' extension will lift multiple constraints on how we organise the code and will allow for cleaner and clearer code. We extract a minor function into a 'utility' module to have something to depends on.

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#require test-repo

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  $ checkflake8() {

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  >   if ! (which flake8 > /dev/null); then

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  >     echo skipped: missing tool: flake8;

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  >     exit 80;

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  >   fi;

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  > };

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  $ checkflake8

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Copied from Mercurial core (60ee2593a270)

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  $ cd "`dirname "$TESTDIR"`"

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run flake8 if it exists; if it doesn't, then just skip

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  $ type flake8 >/dev/null 2>/dev/null && hg files -0 'glob:**.py' | xargs -0 flake8