chore(tvix/eval): gate REPL-only dependencies behind `repl` feature r/4772

With this change, it becomes possible to compile tvix-eval to
webassembly if the `repl` feature is disabled.

Change-Id: Icc0a059964cd0bea2054110c682d50fc5c87ec01
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6446
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>

1 files changed, 13 insertions, 1 deletions

diff --git a/tvix/eval/Cargo.toml b/tvix/eval/Cargo.toml
index 4f2fda7e613a..226f3a98a31f 100644
--- a/tvix/eval/Cargo.toml
+++ b/tvix/eval/Cargo.toml
@@ -5,9 +5,16 @@ edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
+[lib]
+name = "tvix_eval"
+
+[[bin]]
+name = "tvix-eval"
+required-features = [ "repl" ]
+
 [dependencies]
 smol_str = "0.1"
-rustyline = "10.0.0"
+rustyline = { version = "10.0.0", optional = true }
 dirs = "4.0.0"
 path-clean = "0.1"
 tabwriter = { version = "1.2", optional = true }
@@ -27,10 +34,15 @@ pretty_assertions = "1.2.1"
 itertools = "0.10.3"
 
 [features]
+default = [ "repl" ]
+
 # Enables running the Nix language test suite from the original C++
 # Nix implementation (at version 2.3) against Tvix.
 nix_tests = []
 
+# Enables building the binary (tvix-eval REPL)
+repl = [ "dep:rustyline" ]
+
 # Enables printing compiled code and tracing the stack state at runtime.
 disassembler = ["dep:tabwriter"]