lib.getVersion: extend the function to cope with strings as well as derivations
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@ -189,9 +189,13 @@ rec {
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versionAtLeast = v1: v2: !versionOlder v1 v2;
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# Get the version of the specified derivation, as specified in its
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# ‘name’ attribute.
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getVersion = drv: (builtins.parseDrvName drv.name).version;
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# This function takes an argument that's either a derivation or a
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# derivation's "name" attribute and extracts the version part from that
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# argument. For example:
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#
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# lib.getVersion "youtube-dl-2016.01.01" ==> "2016.01.01"
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# lib.getVersion pkgs.youtube-dl ==> "2016.01.01"
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getVersion = x: (builtins.parseDrvName (x.name or x)).version;
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# Extract name with version from URL. Ask for separator which is
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