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nix repl: Print which variables are just loaded

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When we run `nix repl nixpkgs` we get "Added 6 variables". This is not
useful as it doesn't tell us which variables the flake has exported to
our global repl scope.

This patch prints the name of each variable that was just loaded. We
currently cap printing to 20 variables in order to avoid excessive
prints.

https://github.com/NixOS/nix/issues/11404
This commit is contained in:
Kevin Robert Stravers 2024-09-21 02:56:04 -04:00
parent 2afc84fddf
commit 3c9b9b13af
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2 changed files with 47 additions and 1 deletions
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19
src/libcmd/repl.cc
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@ -813,6 +813,25 @@ void NixRepl::addAttrsToScope(Value & attrs)
staticEnv->sort();
staticEnv->deduplicate();
notice("Added %1% variables.", attrs.attrs()->size());
const int max_print = 20;
int counter = 0;
std::ostringstream loaded;
for (auto & i : attrs.attrs()->lexicographicOrder(state->symbols)) {
if (counter >= max_print)
break;
if (counter > 0)
loaded << ", ";
printIdentifier(loaded, state->symbols[i->name]);
counter += 1;
}
notice("%1%", loaded.str());
if (attrs.attrs()->size() > max_print)
notice("... and %1% more", attrs.attrs()->size() - max_print);
}