feat: shell for packages and custom flakes

Cargo.toml

@@ -4,3 +4,6 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
+clap = { version = "4.5.17", features = ["derive"] }
+runix = "0.1.1"
+tokio = { version = "1", features = ["full"] }

flake.nix

@@ -73,4 +73,9 @@
           };
         }
     );
+
+  nixConfig = {
+    extra-substituters = ["callumio-public.cachix.org"];
+    extra-trusted-public-keys = ["callumio-public.cachix.org-1:VucOSl7vh44GdqcILwMIeHlI0ufuAnHAl8cO1U/7yhg="];
+  };
 }

src/main.rs

@@ -1 +1,44 @@
-fn main() {}
+use clap::Parser;
+use runix::{
+    arguments::{
+        eval::EvaluationArgs, flake::FlakeArgs, source::SourceArgs, InstallablesArgs, NixArgs,
+    },
+    command::Shell,
+    default::NixCommandLine,
+    installable::Installable,
+    Run,
+};
+
+#[derive(Parser, Debug)]
+#[command(version, about)]
+struct Args {
+    /// List of packages to include in the shell.
+    ///
+    /// <package> to implicitly use nixpkgs
+    ///
+    /// <flake#package> to use a different flake
+    #[arg(value_parser = preprocess)]
+    pkgs: Vec<Installable>,
+}
+
+fn preprocess(s: &str) -> Result<Installable, String> {
+    Ok(Installable::from(if s.contains('#') {
+        s.to_owned()
+    } else {
+        format!("nixpkgs#{}", s)
+    }))
+}
+
+#[tokio::main]
+async fn main() -> Result<(), runix::default::NixCommandLineRunError> {
+    let cli = Args::parse();
+    dbg!(&cli.pkgs);
+    Shell {
+        flake: FlakeArgs::default(),
+        eval: EvaluationArgs::default(),
+        source: SourceArgs::default(),
+        installables: InstallablesArgs::from(cli.pkgs),
+    }
+    .run(&NixCommandLine::default(), &NixArgs::default())
+    .await
+}