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{lib, pkgs} :
let inherit (lib) nv nvs; in
{
# see for example:
# - development/interpreters/php_configurable/default.nix
# - .. search composableDerivation in all-packages.nix ..
#
# You should be able to override anything you like easily
# grep the mailinglist by title "python proposal" (dec 08)
# -> http://mail.cs.uu.nl/pipermail/nix-dev/2008-December/001571.html
# to see why this got complicated when using all its features
composableDerivation = {
# modify args before applying stdenv.mkDerivation, this should remove at least attrs removeAttrsBy
f ? lib.prepareDerivationArgs,
stdenv ? pkgs.stdenv,
# initial set of arguments to be passed to stdenv.mkDerivation passing prepareDerivationArgs by default
initial ? {},
# example func : (x: x // { x.buildInputs ++ ["foo"] }), but see mergeAttrByFunc which does this for you
merge ? (lib.mergeOrApply lib.mergeAttrByFunc)
}: lib.applyAndFun
(args: stdenv.mkDerivation (f args))
merge
(merge { inherit (lib) mergeAttrBy; } initial);
# some utility functions
# use this function to generate flag attrs for prepareDerivationArgs
# E nable D isable F eature
edf = {name, feat ? name, enable ? {}, disable ? {} , value ? ""}:
nvs name {
set = {
configureFlags = ["--enable-${feat}${if value == "" then "" else "="}${value}"];
} // enable;
unset = {
configureFlags = ["--disable-${feat}"];
} // disable;
};
# same for --with and --without-
# W ith or W ithout F eature
wwf = {name, feat ? name, enable ? {}, disable ? {}, value ? ""}:
nvs name {
set = {
configureFlags = ["--with-${feat}${if value == "" then "" else "="}${value}"];
} // enable;
unset = {
configureFlags = ["--without-${feat}"];
} // disable;
};
}
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