Using niv to version home-manager zsh plugins?

danieldk · September 2, 2020, 3:58pm

Good question.

NixOS/nix/blob/b721877b85bbf9f78fd2221d8eb540373ee1e889/src/libexpr/eval.cc#L1772


      
          if (v.type == tPath) {
              Path path(canonPath(v.path));
              return copyToStore ? copyPathToStore(context, path) : path;
          }
          
          if (v.type == tAttrs) {
              auto maybeString = tryAttrsToString(pos, v, context, coerceMore, copyToStore);
              if (maybeString) {
                  return *maybeString;
              }
              auto i = v.attrs->find(sOutPath);
              if (i == v.attrs->end()) throwTypeError(pos, "cannot coerce a set to a string");
              return coerceToString(pos, *i->value, context, coerceMore, copyToStore);
          }
          
          if (v.type == tExternal)
              return v.external->coerceToString(pos, context, coerceMore, copyToStore);
          
          if (coerceMore) {
          
              /* Note that `false' is represented as an empty string for

nix-repl> foo = {}
nix-repl> "${foo}"
error: cannot coerce a set to a string, at (string):1:2
nix-repl> bar = { outPath = "/hello/world"; }
nix-repl> "${bar}"                            
"/hello/world"

I guess it would be nice if this was documented in the Nix manual.