Environment variables correctly exported, shell vars not yet

Cargo.toml

@@ -14,7 +14,6 @@ itertools = "0.13.0"
 nu-plugin = "0.98.0"
 nu-protocol = "0.98.0"
 once_cell = "1.19.0"
-rust-embed = "8.5.0"
 serde = "1.0.208"
 serde_json = "1.0.125"
 shellexpand = "3.1.0"

README.md

@@ -132,7 +132,7 @@ Prior to 0.13.0 this plugin was written in Bash, with the Nu plugin protocol don
 
 Since 0.13.0, the plugin is written in Rust, with the much simplified Bash script embedded.
 
-By default the embedded Bash script is extracted at runtime into a temporary directory.  This behaviour may be overridden by setting the ``NU_PLUGIN_BASH_ENV_SCRIPT` environment variable, which is then expected to resolve to the path of the pre-installed script.
+By default the embedded Bash script is extracted at runtime into a temporary directory.  This behaviour may be overridden by setting the ``NU_PLUGIN_BASH_ENV_JSON` environment variable, which is then expected to resolve to the path of the pre-installed script.
 
 ## Logging
 

build.rs

@@ -0,0 +1,54 @@
+use std::{
+    env,
+    path::{Path, PathBuf},
+};
+
+const BASH_ENV_JSON_VERSION: &str = "0.6.0";
+
+fn fetch_bash_env_json() -> Option<PathBuf> {
+    let out_dir: PathBuf = env::var("OUT_DIR").unwrap().into();
+    let bash_env_json_repo_dir = PathBuf::from("bash-env-json");
+    let bash_env_json_repo_path = out_dir.join(bash_env_json_repo_dir.as_path());
+
+    if Path::exists(&bash_env_json_repo_path) {
+        Some(bash_env_json_repo_path)
+    } else {
+        let bash_env_json_repo_path_str = bash_env_json_repo_path.to_string_lossy();
+        let git_args = [
+            "clone",
+            "--filter=blob:none",
+            "--branch",
+            BASH_ENV_JSON_VERSION,
+            "https://github.com/tesujimath/bash-env-json.git",
+            bash_env_json_repo_path_str.as_ref(),
+        ];
+        println!("cargo:warning=git {}", &git_args.join(" "));
+        match std::process::Command::new("git").args(git_args).output() {
+            Ok(output) => {
+                if output.status.success() {
+                    Some(bash_env_json_repo_path)
+                } else {
+                    println!(
+                        "cargo:warning=git {:?} failed: {}",
+                        &git_args, output.status
+                    );
+
+                    None
+                }
+            }
+            Err(e) => {
+                println!("cargo:warning=git clone failed: {}", e);
+
+                None
+            }
+        }
+    }
+}
+
+fn main() -> std::io::Result<()> {
+    if let Some(_bash_env_json_repo_path) = fetch_bash_env_json() {
+        // TODO what now?
+    }
+
+    Ok(())
+}