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

package.json

@@ -1 +1 @@
-{"name":"vesper","private":true,"version":"1.0.0","type":"module","scripts":{"dev":"vite","build":"tsc && vite build","preview":"vite preview","tauri":"tauri"},"dependencies":{"@fontsource-variable/inter":"^5.2.8","@fontsource-variable/jetbrains-mono":"^5.2.8","@tailwindcss/typography":"^0.5.19","@tailwindcss/vite":"^4.1.18","@tauri-apps/api":"^2","@tauri-apps/plugin-dialog":"^2.6.0","@tauri-apps/plugin-fs":"^2.4.5","@tauri-apps/plugin-opener":"^2","daisyui":"^5.5.18","framer-motion":"^12.34.0","highlight.js":"^11.11.1","lucide-react":"^0.564.0","markdown-it":"^14.1.1","markdown-it-mark":"^4.0.0","markdown-it-sub":"^2.0.0","markdown-it-sup":"^2.0.0","markdown-it-task-lists":"^2.1.1","overlayscrollbars":"^2.14.0","overlayscrollbars-react":"^0.5.6","react":"^19.1.0","react-dom":"^19.1.0","tailwindcss":"^4.1.18"},"devDependencies":{"@tauri-apps/cli":"^2","@types/markdown-it":"^14.1.2","@types/react":"^19.1.8","@types/react-dom":"^19.1.6","@vitejs/plugin-react":"^4.6.0","png-to-ico":"^3.0.1","puppeteer-core":"^24.37.3","sharp":"^0.34.5","typescript":"~5.8.3","vite":"^7.0.4"}}
+{"name":"vesper","private":true,"version":"1.0.1","type":"module","scripts":{"dev":"vite","build":"tsc && vite build","preview":"vite preview","tauri":"tauri"},"dependencies":{"@fontsource-variable/inter":"^5.2.8","@fontsource-variable/jetbrains-mono":"^5.2.8","@tailwindcss/typography":"^0.5.19","@tailwindcss/vite":"^4.1.18","@tauri-apps/api":"^2","@tauri-apps/plugin-dialog":"^2.6.0","@tauri-apps/plugin-fs":"^2.4.5","@tauri-apps/plugin-opener":"^2","daisyui":"^5.5.18","framer-motion":"^12.34.0","highlight.js":"^11.11.1","lucide-react":"^0.564.0","markdown-it":"^14.1.1","markdown-it-mark":"^4.0.0","markdown-it-sub":"^2.0.0","markdown-it-sup":"^2.0.0","markdown-it-task-lists":"^2.1.1","overlayscrollbars":"^2.14.0","overlayscrollbars-react":"^0.5.6","react":"^19.1.0","react-dom":"^19.1.0","tailwindcss":"^4.1.18"},"devDependencies":{"@tauri-apps/cli":"^2","@types/markdown-it":"^14.1.2","@types/react":"^19.1.8","@types/react-dom":"^19.1.6","@vitejs/plugin-react":"^4.6.0","png-to-ico":"^3.0.1","puppeteer-core":"^24.37.3","sharp":"^0.34.5","typescript":"~5.8.3","vite":"^7.0.4"}}

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",

src/App.tsx

@@ -3,6 +3,7 @@ import { open } from "@tauri-apps/plugin-dialog";
 import { readTextFile } from "@tauri-apps/plugin-fs";
 import { getCurrentWindow } from "@tauri-apps/api/window";
 import { getCurrentWebview } from "@tauri-apps/api/webview";
+import { listen } from "@tauri-apps/api/event";
 import MarkdownIt from "markdown-it";
 import hljs from "highlight.js";
 import { motion, AnimatePresence } from "framer-motion";
@@ -512,6 +513,31 @@ function App() {
     return () => { unlisten?.(); };
   }, [parseHeadings]);
 
+  // Handle file opened via OS file association (e.g. double-clicking a .md file)
+  useEffect(() => {
+    let unlisten: (() => void) | undefined;
+    listen<string>('open-file', async (event) => {
+      const filePath = event.payload;
+      try {
+        const existing = tabsRef.current.find(t => t.path === filePath);
+        if (existing) {
+          setActiveTabId(existing.id);
+          parseHeadings(existing.content);
+        } else {
+          const content = await readTextFile(filePath);
+          const title = filePath.split(/[/\\]/).pop() || 'Untitled';
+          const newTab: Tab = { id: Date.now().toString(), title, content, path: filePath };
+          setTabs(prev => [...prev, newTab]);
+          setActiveTabId(newTab.id);
+          parseHeadings(content);
+        }
+      } catch (err) {
+        console.error('Failed to open file from OS:', err);
+      }
+    }).then(fn => { unlisten = fn; });
+    return () => { unlisten?.(); };
+  }, [parseHeadings]);
+
   const handleOpenDialog = useCallback(async () => {
     try {
       const selected = await open({ multiple: false, filters: [{ name: 'Markdown', extensions: ['md', 'markdown', 'txt'] }] });