forked from lix-project/lix
Maximilian Bosch
2b02ce0e48
I found it somewhat confusing to have an error like
error: attribute 'getFlake' missing
if the required experimental-feature (`flakes`) is not enabled. Instead,
I'd expect Nix to throw an error just like it's the case when using e.g. `nix
flake` without `flakes` being enabled.
With this change, the error looks like this:
$ nix-instantiate -E 'builtins.getFlake "nixpkgs"'
error: Cannot call 'builtins.getFlake' because experimental Nix feature 'flakes' is disabled. You can enable it via '--extra-experimental-features flakes'.
at «string»:1:1:
1| builtins.getFlake "nixpkgs"
| ^
I didn't use `settings.requireExperimentalFeature` here on purpose
because this doesn't contain a position. Also, it doesn't seem as if we
need to catch the error and check for the missing feature here since
this already happens at evaluation time.
45 lines
1.1 KiB
C++
45 lines
1.1 KiB
C++
#pragma once
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#include "eval.hh"
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#include <tuple>
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#include <vector>
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namespace nix {
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struct RegisterPrimOp
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{
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struct Info
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{
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std::string name;
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std::vector<std::string> args;
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size_t arity = 0;
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const char * doc;
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PrimOpFun fun;
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};
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typedef std::vector<Info> PrimOps;
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static PrimOps * primOps;
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/* You can register a constant by passing an arity of 0. fun
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will get called during EvalState initialization, so there
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may be primops not yet added and builtins is not yet sorted. */
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RegisterPrimOp(
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std::string name,
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size_t arity,
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PrimOpFun fun);
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RegisterPrimOp(Info && info);
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};
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/* These primops are disabled without enableNativeCode, but plugins
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may wish to use them in limited contexts without globally enabling
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them. */
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/* Load a ValueInitializer from a DSO and return whatever it initializes */
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void prim_importNative(EvalState & state, const Pos & pos, Value * * args, Value & v);
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/* Execute a program and parse its output */
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void prim_exec(EvalState & state, const Pos & pos, Value * * args, Value & v);
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}
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