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Revert "Merge branch 'improved-make-overridable' of git://github.com/ElvishJerricco/nixpkgs"

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This reverts commit c3af1210b4, reversing
changes made to 49f175cd0c.
This commit is contained in:
Shea Levy 2017-09-29 09:11:26 -04:00
parent 8f33315f8f
commit 1a1ad1a17d
9 changed files with 113 additions and 206 deletions
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34
lib/fixed-points.nix
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@ -72,34 +72,8 @@ rec {
# Same as `makeExtensible` but the name of the extending attribute is
# customized.
makeExtensibleWithCustomName = extenderName: f: makeExtensibleWithInterface
(fixedPoint: extend: fixedPoint // { ${extenderName} = ext: extend (_: ext); })
(_: f);
# A version of `makeExtensible` that allows the function being fixed
# to return a different interface than the interface returned to the
# user. Along with `self` and `super` views of the internal
# interface, a `self` view of the output interface is also
# provided. `extend` is not added to the output by default. This is
# the job of the interface.
#
# nix-repl> foo = {a, b}: {c = a + b;}
#
# nix-repl> interface = {args, val, ...}: extend: val // {inherit extend;}
#
# nix-repl> obj = makeExtensibleWithInterface interface (output: self: { args = {a = 1; b = 2;}; val = foo self.args; })
#
# nix-repl> obj.c
# 3
#
# nix-repl> obj = obj.extend (output: self: super: { args = super.args // { b = output.d; }; })
#
# nix-repl> obj = obj.extend (output: self: super: { val = super.val // { d = 10; }; })
#
# nix-repl> { inherit (obj) c d; }
# { c = 11; d = 10; }
makeExtensibleWithInterface = interface: f: let i = interface
(fix' (f i))
(fext: makeExtensibleWithInterface interface (i': (extends (fext i') (f i'))));
in i;
makeExtensibleWithCustomName = extenderName: rattrs:
fix' rattrs // {
${extenderName} = f: makeExtensibleWithCustomName extenderName (extends f rattrs);
};
}