mirror of
https://github.com/NixOS/nix
synced 2024-09-21 11:30:30 -04:00
1ecc97b6bd
brackets, e.g.
import <nixpkgs/pkgs/lib>
are resolved by looking them up relative to the elements listed in
the search path. This allows us to get rid of hacks like
import "${builtins.getEnv "NIXPKGS_ALL"}/pkgs/lib"
The search path can be specified through the ‘-I’ command-line flag
and through the colon-separated ‘NIX_PATH’ environment variable,
e.g.,
$ nix-build -I /etc/nixos ...
If a file is not found in the search path, an error message is
lazily thrown.
48 lines
1.1 KiB
C++
48 lines
1.1 KiB
C++
#include "common-opts.hh"
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#include "../libmain/shared.hh"
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#include "util.hh"
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namespace nix {
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bool parseOptionArg(const string & arg, Strings::iterator & i,
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const Strings::iterator & argsEnd, EvalState & state,
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Bindings & autoArgs)
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{
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if (arg != "--arg" && arg != "--argstr") return false;
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UsageError error(format("`%1%' requires two arguments") % arg);
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if (i == argsEnd) throw error;
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string name = *i++;
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if (i == argsEnd) throw error;
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string value = *i++;
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/* !!! check for duplicates! */
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Value * v = state.allocValue();
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autoArgs.push_back(Attr(state.symbols.create(name), v));
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if (arg == "--arg")
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state.mkThunk_(*v, state.parseExprFromString(value, absPath(".")));
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else
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mkString(*v, value);
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autoArgs.sort(); // !!! inefficient
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return true;
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}
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bool parseSearchPathArg(const string & arg, Strings::iterator & i,
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const Strings::iterator & argsEnd, EvalState & state)
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{
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if (arg != "-I") return false;
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if (i == argsEnd) throw UsageError(format("`%1%' requires an argument") % arg);;
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state.addToSearchPath(*i++);
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return true;
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}
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}
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