feat(tvix/cli): implement `NixCompatIO` helper type r/5474

This type allows for temporarily compatibility with the C++ Nix store,
specifically (for now) it gives us the store directory used by Nix and
imports files the same way.

Change-Id: I4767794ef2863eba49661315c63c4e17de946d60
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7587
Reviewed-by: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI

1 files changed, 3 insertions, 1 deletions

diff --git a/tvix/cli/src/main.rs b/tvix/cli/src/main.rs
index 7e6b7520b019..3228489e718a 100644
--- a/tvix/cli/src/main.rs
+++ b/tvix/cli/src/main.rs
@@ -1,3 +1,5 @@
+mod nix_compat;
+
 use std::{fs, path::PathBuf};
 
 use clap::Parser;
@@ -39,7 +41,7 @@ struct Args {
 /// evaluation succeeded.
 fn interpret(code: &str, path: Option<PathBuf>, args: &Args) -> bool {
     let mut eval = tvix_eval::Evaluation::new(code, path);
-    eval.io_handle = Box::new(tvix_eval::StdIO);
+    eval.io_handle = Box::new(nix_compat::NixCompatIO::new());
     eval.nix_path = args.nix_search_path.clone();
 
     let source_map = eval.source_map();