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/*
Usage:
You define you custom builder script by adding all build steps to a list.
for example:
builder = writeScript "fsg-4.4-builder"
(textClosure [doUnpack addInputs preBuild doMake installPhase doForceShare]);
a step is defined by noDepEntry, FullDepEntry or PackEntry.
To ensure that prerequisite are met those are added before the task itself by
textClosureDupList. Duplicated items are removed again.
See trace/nixpkgs/trunk/pkgs/top-level/builder-defs.nix for some predefined build steps
*/
{stdenv, lib}:
with lib;
rec {
/* !!! The interface of this function is kind of messed up, since
it's way too overloaded and almost but not quite computes a
topological sort of the depstrings. */
textClosureList = predefined: arg:
let
f = done: todo:
if todo == [] then {result = []; inherit done;}
else
let entry = head todo; in
if isAttrs entry then
let x = f done entry.deps;
y = f x.done (tail todo);
in { result = x.result ++ [entry.text] ++ y.result;
done = y.done;
}
else if hasAttr entry done then f done (tail todo)
else f (done // listToAttrs [{name = entry; value = 1;}]) ([(builtins.getAttr entry predefined)] ++ tail todo);
in (f {} arg).result;
textClosureMap = f: predefined: names:
concatStringsSep "\n" (map f (textClosureList predefined names));
noDepEntry = text: {inherit text; deps = [];};
fullDepEntry = text: deps: {inherit text deps;};
packEntry = deps: {inherit deps; text="";};
# Old names - don't use.
FullDepEntry = fullDepEntry;
PackEntry = packEntry;
}
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