renamed chosenOptions to chooseOptionsByFlags and added support for optionals
(thus you don't need to write flag definitions, passing a dependency or not is enough) svn path=/nixpkgs/trunk/; revision=9167
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@ -17,7 +17,6 @@ rec {
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if list == []
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then nul
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else op (head list) (fold op nul (tail list));
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# Concatenate a list of lists.
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concatLists =
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@ -198,6 +197,7 @@ rec {
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catAttrs = attr : l : fold ( s : l : if (__hasAttr attr s) then [(__getAttr attr s)] ++ l else l) [] l;
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flattenSet = set : map ( attr : __getAttr attr set) (__attrNames set);
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mapIf = cond : f : fold ( x : l : if (cond x) then [(f x)] ++ l else l) [];
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# Marc 2nd proposal: (not everything has been tested in detail yet..)
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# One example showing how to use mandatory dependencies [1], default flags [2], ..
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@ -218,7 +218,7 @@ rec {
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# alternativeAddOn = { cfgOption = "--enable-add-ons-alt"; blocks = ["addOns", "addOns2"]; };
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# justAOption = { };
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# };
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# co = chosenOptions flagDescr args args.flags;
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# co = chooseOptionsByFlags flagDescr ["libpng", "libjpg"] args;
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#in args.stdenv.mkDerivation {
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@ -256,7 +256,17 @@ rec {
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# flags = { flagName = true/ false for each attribute in flagDescr
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# ... }
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chosenOptions = flagDescr : args : flags :
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# optionals is a list of dependency names. If passed as attribute in args they'll be automatically added
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# to flags and flagDescr ( optionalName = { buildInputs = optionalName } )
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chooseOptionsByFlags = flagDescr : optionals : args :
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let givenOptionals = listToAttrs
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(mapIf ( a : (__hasAttr a args) )
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( x: av x { buildInputs = x; } )
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optionals );
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fd = flagDescr // givenOptionals;
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in chooseOptionsByFlags2 fd args ( getAttr ["flags"] [] args ++ (__attrNames givenOptionals ) );
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chooseOptionsByFlags2 = flagDescr : args : flags :
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let
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# helper function
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collectFlags = state : flags :
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