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renamed chosenOptions to chooseOptionsByFlags and added support for optionals

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(thus you don't need to write flag definitions, passing a dependency or not is enough)

svn path=/nixpkgs/trunk/; revision=9167
This commit is contained in:
Marc Weber 2007-08-19 17:24:05 +00:00
parent ee347e49c1
commit 8f3a8b5006
1 changed files with 13 additions and 3 deletions
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16
pkgs/lib/default-unstable.nix
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@ -17,7 +17,6 @@ rec {
if list == []
then nul
else op (head list) (fold op nul (tail list));
# Concatenate a list of lists.
concatLists =
@ -198,6 +197,7 @@ rec {
catAttrs = attr : l : fold ( s : l : if (__hasAttr attr s) then [(__getAttr attr s)] ++ l else l) [] l;
flattenSet = set : map ( attr : __getAttr attr set) (__attrNames set);
mapIf = cond : f : fold ( x : l : if (cond x) then [(f x)] ++ l else l) [];
# Marc 2nd proposal: (not everything has been tested in detail yet..)
# One example showing how to use mandatory dependencies [1], default flags [2], ..
@ -218,7 +218,7 @@ rec {
# alternativeAddOn = { cfgOption = "--enable-add-ons-alt"; blocks = ["addOns", "addOns2"]; };
# justAOption = { };
# };
# co = chosenOptions flagDescr args args.flags;
# co = chooseOptionsByFlags flagDescr ["libpng", "libjpg"] args;
#in args.stdenv.mkDerivation {
@ -256,7 +256,17 @@ rec {
# flags = { flagName = true/ false for each attribute in flagDescr
# ... }
chosenOptions = flagDescr : args : flags :
# optionals is a list of dependency names. If passed as attribute in args they'll be automatically added
# to flags and flagDescr ( optionalName = { buildInputs = optionalName } )
chooseOptionsByFlags = flagDescr : optionals : args :
let givenOptionals = listToAttrs
(mapIf ( a : (__hasAttr a args) )
( x: av x { buildInputs = x; } )
optionals );
fd = flagDescr // givenOptionals;
in chooseOptionsByFlags2 fd args ( getAttr ["flags"] [] args ++ (__attrNames givenOptionals ) );
chooseOptionsByFlags2 = flagDescr : args : flags :
let
# helper function
collectFlags = state : flags :