forked from lix-project/lix
* Merging from nix-make branch:
- Add __currentTime primitive (dangerous!). - Allow imports of derivations.
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1 changed files with 40 additions and 6 deletions
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@ -8,11 +8,36 @@
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argument. */
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static Expr primImport(EvalState & state, const ATermVector & args)
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{
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ATerm path;
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Expr fn = evalExpr(state, args[0]);
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if (!matchPath(fn, path))
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throw Error("path expected");
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return evalFile(state, aterm2String(path));
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ATermList es;
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Path path;
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Expr arg = evalExpr(state, args[0]), arg2;
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if (matchPath(arg, arg2))
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path = aterm2String(arg2);
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else if (matchAttrs(arg, es)) {
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Expr a = queryAttr(arg, "type");
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/* If it is a derivation, we have to realise it and load the
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Nix expression created at the derivation's output path. */
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if (a && evalString(state, a) == "derivation") {
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a = queryAttr(arg, "drvPath");
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if (!a) throw Error("bad derivation in import");
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Path drvPath = evalPath(state, a);
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buildDerivations(singleton<PathSet>(drvPath));
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a = queryAttr(arg, "outPath");
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if (!a) throw Error("bad derivation in import");
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path = evalPath(state, a);
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}
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}
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if (path == "")
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throw Error("path or derivation expected in import");
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return evalFile(state, path);
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}
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@ -339,7 +364,7 @@ static Expr primToString(EvalState & state, const ATermVector & args)
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ATerm s;
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if (matchStr(arg, s) || matchPath(arg, s) || matchUri(arg, s))
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return makeStr(s);
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else throw Error("cannot coerce value to string");
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throw Error("cannot coerce value to string");
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}
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@ -398,12 +423,19 @@ static Expr primCurrentSystem(EvalState & state, const ATermVector & args)
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}
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static Expr primCurrentTime(EvalState & state, const ATermVector & args)
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{
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return ATmake("Int(<int>)", time(0));
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}
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void EvalState::addPrimOps()
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{
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addPrimOp("true", 0, primTrue);
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addPrimOp("false", 0, primFalse);
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addPrimOp("null", 0, primNull);
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addPrimOp("__currentSystem", 0, primCurrentSystem);
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addPrimOp("__currentTime", 0, primCurrentTime);
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addPrimOp("import", 1, primImport);
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addPrimOp("derivation", 1, primDerivation);
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@ -413,3 +445,5 @@ void EvalState::addPrimOps()
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addPrimOp("map", 2, primMap);
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}
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