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55 lines
2 KiB
Nix
55 lines
2 KiB
Nix
{lib, pkgs} :
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let inherit (lib) nv nvs; in
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{
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# see for example:
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# - development/interpreters/php_configurable/default.nix
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# - .. search composableDerivation in all-packages.nix ..
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#
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# You should be able to override anything you like easily
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# grep the mailinglist by title "python proposal" (dec 08)
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# -> http://mail.cs.uu.nl/pipermail/nix-dev/2008-December/001571.html
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# to see why this got complicated when using all its features
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# TODO add newer example using new syntax (kernel derivation proposal -> mailinglist)
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composableDerivation = {
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mkDerivation ? pkgs.stdenv.mkDerivation,
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# list of functions to be applied before defaultOverridableDelayableArgs removes removeAttrs names
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# prepareDerivationArgs handles derivation configurations
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applyPreTidy ? [ lib.prepareDerivationArgs ],
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# consider adding addtional elements by derivation.merge { removeAttrs = ["elem"]; };
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removeAttrs ? ["cfg" "flags"]
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}: (lib.defaultOverridableDelayableArgs ( a: mkDerivation a)
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{
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inherit applyPreTidy removeAttrs;
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}).merge;
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# some utility functions
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# use this function to generate flag attrs for prepareDerivationArgs
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# E nable D isable F eature
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edf = {name, feat ? name, enable ? {}, disable ? {} , value ? ""}:
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nvs name {
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set = {
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configureFlags = ["--enable-${feat}${if value == "" then "" else "="}${value}"];
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} // enable;
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unset = {
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configureFlags = ["--disable-${feat}"];
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} // disable;
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};
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# same for --with and --without-
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# W ith or W ithout F eature
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wwf = {name, feat ? name, enable ? {}, disable ? {}, value ? ""}:
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nvs name {
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set = enable // {
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configureFlags = ["--with-${feat}${if value == "" then "" else "="}${value}"]
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++ lib.maybeAttr "configureFlags" [] enable;
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};
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unset = disable // {
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configureFlags = ["--without-${feat}"]
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++ lib.maybeAttr "configureFlags" [] disable;
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};
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};
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}
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