write plumbing to & from CLI installer

installer-gui/src-tauri/src/lib.rs

@@ -1,7 +1,38 @@
-// Learn more about Tauri commands at https://tauri.app/develop/calling-rust/
+use anyhow::Context;
+use tauri::Emitter;
+use tauri_plugin_shell::ShellExt;
+use tauri_plugin_shell::process::CommandEvent;
+
+async fn run_installer(app_handle: tauri::AppHandle, args: String) -> anyhow::Result<()> {
+    let (mut rx, _child) = app_handle
+        .shell()
+        .sidecar("installer-cli")
+        .context("Error preparing Rayhunter CLI installer to be run")?
+        .args(args.split_whitespace())
+        .spawn()
+        .context("Error launching Rayhunter CLI installer")?;
+    while let Some(event) = rx.recv().await {
+        match event {
+            CommandEvent::Stdout(line_bytes) | CommandEvent::Stderr(line_bytes) => {
+                let line = String::from_utf8(line_bytes)
+                    .context("Error parsing Rayhunter CLI installer output")?;
+                app_handle
+                    .emit("installer-output", &line)
+                    .context("Error sending Rayhunter CLI installer output to GUI frontend")?;
+            }
+            _ => (),
+        };
+    }
+    Ok(())
+}
+
 #[tauri::command]
-fn greet(name: &str) -> String {
-    format!("Hello, {}! You've been greeted from Rust!", name)
+async fn install_rayhunter(app_handle: tauri::AppHandle, args: String) -> Result<(), String> {
+    // the return value of tauri commands needs to be serializable by serde which we accomplish
+    // here by converting anyhow::Error to a string
+    run_installer(app_handle, args)
+        .await
+        .map_err(|error| format!("{error:?}"))
 }
 
 #[cfg_attr(mobile, tauri::mobile_entry_point)]
@@ -9,7 +40,7 @@ pub fn run() {
     tauri::Builder::default()
         .plugin(tauri_plugin_shell::init())
         .plugin(tauri_plugin_opener::init())
-        .invoke_handler(tauri::generate_handler![greet])
+        .invoke_handler(tauri::generate_handler![install_rayhunter])
         .run(tauri::generate_context!())
         .expect("error while running tauri application");
 }