forked from lix-project/lix
6519f06f39
For instance, you can install Firefox from a specific Nixpkgs revision
like this:
$ nix-env -f 63def04891.tar.gz -iA firefox
Or build a package from the latest nixpkgs-unstable channel:
$ nix-build https://nixos.org/channels/nixpkgs-unstable/nixexprs.tar.xz -A hello
68 lines
1.6 KiB
C++
68 lines
1.6 KiB
C++
#include "common-opts.hh"
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#include "shared.hh"
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#include "download.hh"
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#include "util.hh"
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namespace nix {
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bool parseAutoArgs(Strings::iterator & i,
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const Strings::iterator & argsEnd, std::map<string, string> & res)
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{
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string arg = *i;
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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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res[name] = (arg == "--arg" ? 'E' : 'S') + value;
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return true;
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}
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Bindings * evalAutoArgs(EvalState & state, std::map<string, string> & in)
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{
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Bindings * res = state.allocBindings(in.size());
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for (auto & i : in) {
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Value * v = state.allocValue();
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if (i.second[0] == 'E')
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state.mkThunk_(*v, state.parseExprFromString(string(i.second, 1), absPath(".")));
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else
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mkString(*v, string(i.second, 1));
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res->push_back(Attr(state.symbols.create(i.first), v));
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}
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res->sort();
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return res;
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}
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bool parseSearchPathArg(Strings::iterator & i,
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const Strings::iterator & argsEnd, Strings & searchPath)
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{
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if (*i != "-I") return false;
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if (++i == argsEnd) throw UsageError("‘-I’ requires an argument");
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searchPath.push_back(*i);
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return true;
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}
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Path lookupFileArg(EvalState & state, string s)
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{
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if (isUri(s))
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return downloadFileCached(s, true);
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else if (s.size() > 2 && s.at(0) == '<' && s.at(s.size() - 1) == '>') {
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Path p = s.substr(1, s.size() - 2);
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return state.findFile(p);
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} else
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return absPath(s);
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}
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}
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