more tauri stuff (#128)

src-tauri/src/main.rs

@@ -1,8 +1,46 @@
 // Prevents additional console window on Windows in release, DO NOT REMOVE!!
 #![cfg_attr(not(debug_assertions), windows_subsystem = "windows")]
 
+use std::io::Read;
+
+use anyhow::Result;
+use tauri::InvokeError;
+use toml;
+use tauri::Manager;
+
+/// This command returns the a json string parse from a toml file at the path.
+#[tauri::command]
+fn read_toml(path: &str) -> Result<String, InvokeError> {
+  let mut file = std::fs::File::open(path).map_err(|e| InvokeError::from_anyhow(e.into()))?;
+  let mut contents = String::new();
+  file.read_to_string(&mut contents).map_err(|e| InvokeError::from_anyhow(e.into()))?;
+  let value = toml::from_str::<toml::Value>(&contents).map_err(|e| InvokeError::from_anyhow(e.into()))?;
+  let value = serde_json::to_string(&value).map_err(|e| InvokeError::from_anyhow(e.into()))?;
+  Ok(value.to_string())
+}
+
+// This command returns a string that is the contents of a file at the path.
+#[tauri::command]
+fn read_txt_file(path: &str) -> Result<String, InvokeError> {
+  let mut file = std::fs::File::open(path).map_err(|e| InvokeError::from_anyhow(e.into()))?;
+  let mut contents = String::new();
+  file.read_to_string(&mut contents).map_err(|e| InvokeError::from_anyhow(e.into()))?;
+  Ok(contents)
+}
+
 fn main() {
   tauri::Builder::default()
+    .setup(|app| {
+      #[cfg(debug_assertions)] // only include this code on debug builds
+      {
+        let window = app.get_window("main").unwrap();
+        // comment out the below if you don't devtools to open everytime.
+        // it's useful because otherwise devtools shuts everytime rust code changes.
+        window.open_devtools();
+      }
+      Ok(())
+   })
+    .invoke_handler(tauri::generate_handler![read_toml, read_txt_file])
     .run(tauri::generate_context!())
     .expect("error while running tauri application");
 }