95c74eae26
In Nixpkgs, the attribute in all-packages.nix corresponding to a
package is usually equal to the package name. However, this doesn't
work if the package contains a dash, which is fairly common. The
convention is to replace the dash with an underscore (e.g. "dbus-lib"
becomes "dbus_glib"), but that's annoying. So now dashes are valid in
variable / attribute names, allowing you to write:
dbus-glib = callPackage ../development/libraries/dbus-glib { };
and
buildInputs = [ dbus-glib ];
Since we don't have a negation or subtraction operation in Nix, this
is unambiguous.
22 lines
405 B
Nix
22 lines
405 B
Nix
with import ./lib.nix;
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let
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as = { x.y.z = 123; a.b.c = 456; };
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bs = { f-o-o.bar = "foo"; };
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or = x: y: x || y;
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in
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[ as.x.y.z
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as.foo or "foo"
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as.x.y.bla or as.a.b.c
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as.a.b.c or as.x.y.z
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as.x.y.bla or bs.f-o-o.bar or "xyzzy"
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as.x.y.bla or bs.bar.foo or "xyzzy"
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123.bla or null.foo or "xyzzy"
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# Backwards compatibility test.
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(fold or [] [true false false])
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]
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