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Merge branch 'nix-repl-e' of https://github.com/zimbatm/nix

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This commit is contained in:
Eelco Dolstra 2019-11-05 11:20:53 +01:00
commit 852554bb16
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6 changed files with 88 additions and 34 deletions
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32
src/libexpr/attr-path.cc
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@ -93,4 +93,36 @@ Value * findAlongAttrPath(EvalState & state, const string & attrPath,
}
Pos findDerivationFilename(EvalState & state, Value & v, std::string what)
{
Value * v2;
try {
auto dummyArgs = state.allocBindings(0);
v2 = findAlongAttrPath(state, "meta.position", *dummyArgs, v);
} catch (Error &) {
throw Error("package '%s' has no source location information", what);
}
// FIXME: is it possible to extract the Pos object instead of doing this
// toString + parsing?
auto pos = state.forceString(*v2);
auto colon = pos.rfind(':');
if (colon == std::string::npos)
throw Error("cannot parse meta.position attribute '%s'", pos);
std::string filename(pos, 0, colon);
unsigned int lineno;
try {
lineno = std::stoi(std::string(pos, colon + 1));
} catch (std::invalid_argument & e) {
throw Error("cannot parse line number '%s'", pos);
}
Symbol file = state.symbols.create(filename);
return { file, lineno, 0 };
}
}

3
src/libexpr/attr-path.hh
View file

@ -10,4 +10,7 @@ namespace nix {
Value * findAlongAttrPath(EvalState & state, const string & attrPath,
Bindings & autoArgs, Value & vIn);
/* Heuristic to find the filename and lineno or a nix value. */
Pos findDerivationFilename(EvalState & state, Value & v, std::string what);
}