Handle OS file association: open .md files passed as CLI args

src-tauri/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "vesper"
-version = "0.1.0"
+version = "1.0.1"
 description = "A beautiful markdown reader"
 authors = ["you"]
 edition = "2021"

src-tauri/src/lib.rs

@@ -3,7 +3,7 @@ use std::fs;
 use std::path::PathBuf;
 
 use serde::{Deserialize, Serialize};
-use tauri::Manager;
+use tauri::{Emitter, Manager};
 
 #[derive(Serialize, Deserialize, Default)]
 struct WindowState {
@@ -72,6 +72,27 @@ pub fn run() {
                 let _ = window.maximize();
             }
 
+            // If launched with a file argument (e.g. double-clicking a .md file),
+            // emit the path to the frontend so it can open it as a tab.
+            let args: Vec<String> = env::args().collect();
+            if let Some(file_arg) = args.get(1) {
+                let path = PathBuf::from(file_arg);
+                if path.is_file() {
+                    if let Some(ext) = path.extension().and_then(|e| e.to_str()) {
+                        let ext_lower = ext.to_lowercase();
+                        if ext_lower == "md" || ext_lower == "markdown" || ext_lower == "txt" {
+                            let path_str = path.to_string_lossy().to_string();
+                            let win = window.clone();
+                            // Emit after a short delay so the frontend has time to set up listeners
+                            std::thread::spawn(move || {
+                                std::thread::sleep(std::time::Duration::from_millis(500));
+                                let _ = win.emit("open-file", path_str);
+                            });
+                        }
+                    }
+                }
+            }
+
             Ok(())
         })
         .on_window_event(|window, event| {

src-tauri/tauri.conf.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://schema.tauri.app/config/2",
   "productName": "Vesper",
-  "version": "1.0.0",
+  "version": "1.0.1",
   "identifier": "com.vesper.reader",
   "build": {
     "beforeDevCommand": "npm run dev",