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Implement a suggestions mechanism

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Each `Error` class now includes a set of suggestions, and these are printed by
the top-level handler.
This commit is contained in:
regnat 2022-03-03 10:50:35 +01:00
parent b09baf690b
commit c0792b1546
7 changed files with 191 additions and 6 deletions
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10
src/libexpr/attr-path.cc
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@ -74,8 +74,14 @@ std::pair<Value *, Pos> findAlongAttrPath(EvalState & state, const std::string &
throw Error("empty attribute name in selection path '%1%'", attrPath);
Bindings::iterator a = v->attrs->find(state.symbols.create(attr));
if (a == v->attrs->end())
throw AttrPathNotFound("attribute '%1%' in selection path '%2%' not found", attr, attrPath);
if (a == v->attrs->end()) {
std::set<std::string> attrNames;
for (auto & attr : *v->attrs)
attrNames.insert(attr.name);
auto suggestions = Suggestions::bestMatches(attrNames, attr);
throw AttrPathNotFound(suggestions, "attribute '%1%' in selection path '%2%' not found", attr, attrPath);
}
v = &*a->value;
pos = *a->pos;
}