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added prepareDerivationArgs

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svn path=/nixpkgs/trunk/; revision=13545
This commit is contained in:
Marc Weber 2008-12-02 12:26:43 +00:00
parent 570a103136
commit 429df4f864
1 changed files with 55 additions and 0 deletions
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55
pkgs/lib/default.nix
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@ -725,6 +725,61 @@ rec {
then r ++ [ ( nv attr ( f (__getAttr attr attrs) ) ) ] else r ) []
subset_attr_names );
# prepareDerivationArgs tries to make writing configurable derivations easier
# example:
# prepareDerivationArgs {
# mergeAttrBy = {
# myScript = x : y : x ++ "\n" ++ y;
# };
# cfg = {
# readlineSupport = true;
# };
# flags = {
# readline = {
# set = {
# configureFlags = [ "--with-compiler=${compiler}" ];
# buildInputs = [ compiler ];
# pass = { inherit compiler; READLINE=1; };
# assertion = compiler.dllSupport;
# myScript = "foo";
# };
# unset = { configureFlags = ["--without-compiler"]; };
# };
# };
# src = ...
# buildPhase = '' ... '';
# name = ...
# myScript = "bar";
# };
# if you don't have need for unset you can omit the surrounding set = { .. } attr
# all attrs except flags cfg and mergeAttrBy will be merged with the
# additional data from flags depending on config settings
# It's used in composableDerivation in all-packages.nix. It's also used
# heavily in the new python and libs implementation
prepareDerivationArgs = args:
let args2 = { cfg = {}; flags = {}; } // args;
flagName = name : "${name}Support";
cfgWithDefaults = (listToAttrs (map (n : nv (flagName n) false) (attrNames args2.flags)))
// args2.cfg;
opts = flattenAttrs (mapAttrs (a : v :
let v2 = if (v ? set || v ? unset) then v else { set = v; };
n = if (__getAttr (flagName a) cfgWithDefaults) then "set" else "unset";
attr = maybeAttr n {} v2; in
if (maybeAttr "assertion" true attr)
then attr
else throw "assertion of flag ${a} of derivation ${args.name} failed"
) args2.flags );
in removeAttrs
(fold (mergeOrApply mergeAttrByFunc) {} ([args] ++ opts))
["flags" "cfg" "mergeAttrBy" "fixed" ]; # fixed may be passed as fix argument or such
# supportFlag functions for convinience
sFlagEnable = { name, buildInputs ? [], propagatedBuildInputs ? [] } : {
set = { configureFlags = "--enable-${name}"; inherit buildInputs; inherit propagatedBuildInputs; };
unset = { configureFlags = "--disable-${name}"; };
};
# Marc 2nd proposal: (not everything has been tested in detail yet..)
# depreceated because it's too complicated. use prepareDerivationArgs instead