Open files through TUI-WM: context-menu Open, double-click, editor fallback

- Double-clicking a file or choosing the new 'Öppna' context-menu item
  asks TUI-WM to open it via $TUI_WM_SOCKET (open_file), inheriting
  the user's file associations and default editor
- Outside TUI-WM the configured text_editor is used instead: the TUI
  suspends, runs the editor on the same terminal and resumes
- Directories keep navigating as before

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/app.rs

@@ -24,6 +24,8 @@ pub struct ClipboardEntry {
 
 #[derive(Debug, Clone, PartialEq)]
 pub enum ContextMenuItem {
+    /// Öppna filen (via TUI-WM om möjligt) eller gå in i katalogen
+    Open,
     Copy,
     Cut,
     Paste,
@@ -112,6 +114,9 @@ pub struct App {
     /// terminalen, vilket gör hit-testing korrekt även i nästlade
     /// terminaler (t.ex. inne i TUI-WM).
     pub term_size: (u16, u16),
+    /// Editor-kommando + fil som ska köras genom att TUI:t tillfälligt
+    /// suspenderas (fallback när TUI-WM inte kör). Hanteras i run_app.
+    pub pending_spawn: Option<(String, PathBuf)>,
 }
 
 // Which field inside the settings editor is being edited
@@ -187,6 +192,31 @@ impl App {
             settings_hover_button: None,
             unicode_support: detect_unicode_support(),
             term_size: crossterm::terminal::size().unwrap_or((80, 24)),
+            pending_spawn: None,
+        }
+    }
+
+    /// Öppna en fil: via TUI-WM:s socket om vi kör i ett TUI-WM-fönster,
+    /// annars med den konfigurerade editorn (TUI:t suspenderas under tiden).
+    pub fn open_path(&mut self, path: &PathBuf) {
+        if path.is_dir() {
+            self.navigate_to(path.clone());
+            return;
+        }
+        if crate::tui_wm::available() {
+            match crate::tui_wm::open_file(path) {
+                Ok(()) => self.set_status(format!("Öppnar {} via TUI-WM", path.display())),
+                Err(e) => self.set_status(format!("TUI-WM-öppning misslyckades: {}", e)),
+            }
+            return;
+        }
+        let editor = self.config.text_editor.trim().to_string();
+        if editor.is_empty() {
+            self.set_status(
+                "Ingen editor konfigurerad (kugghjulet ≡) och TUI-WM kör inte".to_string(),
+            );
+        } else {
+            self.pending_spawn = Some((editor, path.clone()));
         }
     }
 
@@ -449,6 +479,7 @@ impl App {
             }
         } else {
             if has_selection {
+                items.push(ContextMenuItem::Open);
                 items.push(ContextMenuItem::Copy);
                 items.push(ContextMenuItem::Cut);
             }

src/events.rs

@@ -12,6 +12,30 @@ use crate::ui;
 
 pub fn run_app<B: Backend<Error = io::Error>>(terminal: &mut Terminal<B>, app: &mut App) -> io::Result<()> {
     loop {
+        // Fallback-öppning utanför TUI-WM: suspendera TUI:t, kör editorn
+        // på samma terminal, återuppta och rita om.
+        if let Some((editor, path)) = app.pending_spawn.take() {
+            use crossterm::event::{DisableMouseCapture, EnableMouseCapture};
+            use crossterm::terminal::{
+                disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen,
+            };
+            disable_raw_mode()?;
+            crossterm::execute!(io::stdout(), LeaveAlternateScreen, DisableMouseCapture)?;
+            let status = std::process::Command::new("sh")
+                .arg("-c")
+                .arg(format!("{} '{}'", editor, path.display().to_string().replace('\'', r"'\''")))
+                .status();
+            enable_raw_mode()?;
+            crossterm::execute!(io::stdout(), EnterAlternateScreen, EnableMouseCapture)?;
+            terminal.clear()?;
+            match status {
+                Ok(s) if s.success() => {}
+                Ok(s) => app.set_status(format!("Editorn avslutades med {}", s)),
+                Err(e) => app.set_status(format!("Kunde inte starta editorn: {}", e)),
+            }
+            app.refresh();
+        }
+
         terminal.draw(|f| ui::draw(f, app))?;
 
         if event::poll(Duration::from_millis(50))? {
@@ -381,6 +405,12 @@ fn execute_context_menu(app: &mut App) {
         app.context_menu = None;
         if let Some(item) = item {
             match item {
+                ContextMenuItem::Open => {
+                    if let Some(&i) = app.selected_indices.first()
+                        && let Some(e) = app.entries.get(i) {
+                            app.open_path(&e.path.clone());
+                        }
+                }
                 ContextMenuItem::Copy => app.copy_selected(),
                 ContextMenuItem::Cut => app.cut_selected(),
                 ContextMenuItem::Paste => {
@@ -875,10 +905,10 @@ fn handle_left_click(app: &mut App, col: u16, row: u16) {
 
         if is_double {
             app.last_click_entry = None;
-            if let Some(e) = app.entries.get(idx).cloned()
-                && e.is_dir() {
-                    app.navigate_to(e.path.clone());
-                }
+            if let Some(e) = app.entries.get(idx).cloned() {
+                // Kataloger navigeras; filer öppnas via TUI-WM/editor
+                app.open_path(&e.path.clone());
+            }
         } else {
             app.select_only(idx);
         }

src/main.rs

@@ -2,6 +2,7 @@ mod app;
 mod config;
 mod file_ops;
 mod theme;
+mod tui_wm;
 mod ui;
 mod events;
 

src/tui_wm.rs

@@ -0,0 +1,69 @@
+//! Integration med TUI-WM:s socket-API.
+//!
+//! När TUI-FM körs i ett TUI-WM-fönster sätts miljövariabeln
+//! `TUI_WM_SOCKET`. Via den kan filer öppnas i egna fönster med
+//! användarens filassociationer/standard-editor (TUI-WM visar en
+//! "Öppna med"-dialog för okända format).
+
+use std::path::Path;
+
+/// Kör TUI-FM inne i TUI-WM?
+pub fn available() -> bool {
+    std::env::var("TUI_WM_SOCKET").is_ok()
+}
+
+/// Be TUI-WM öppna en fil. Blockerar bara för handskakningen.
+pub fn open_file(path: &Path) -> Result<(), String> {
+    let sock = std::env::var("TUI_WM_SOCKET").map_err(|_| "TUI_WM_SOCKET saknas".to_string())?;
+    open_via_socket(&sock, path)
+}
+
+#[cfg(unix)]
+fn open_via_socket(sock: &str, path: &Path) -> Result<(), String> {
+    use std::io::{Read, Write};
+    use std::os::unix::net::UnixStream;
+
+    let mut stream = UnixStream::connect(sock).map_err(|e| format!("anslutning: {}", e))?;
+    stream
+        .set_read_timeout(Some(std::time::Duration::from_secs(2)))
+        .ok();
+
+    let write_msg = |s: &mut UnixStream, v: serde_json::Value| -> Result<(), String> {
+        let data = serde_json::to_vec(&v).map_err(|e| e.to_string())?;
+        s.write_all(&(data.len() as u32).to_be_bytes())
+            .and_then(|_| s.write_all(&data))
+            .map_err(|e| e.to_string())
+    };
+    let read_msg = |s: &mut UnixStream| -> Result<serde_json::Value, String> {
+        let mut len = [0u8; 4];
+        s.read_exact(&mut len).map_err(|e| e.to_string())?;
+        let mut buf = vec![0u8; u32::from_be_bytes(len) as usize];
+        s.read_exact(&mut buf).map_err(|e| e.to_string())?;
+        serde_json::from_slice(&buf).map_err(|e| e.to_string())
+    };
+
+    write_msg(
+        &mut stream,
+        serde_json::json!({"type": "hello", "role": "app", "width": 0, "height": 0}),
+    )?;
+    let hello = read_msg(&mut stream)?;
+    if hello.get("type").and_then(|t| t.as_str()) != Some("hello_ok") {
+        return Err("oväntat svar från TUI-WM".to_string());
+    }
+    write_msg(
+        &mut stream,
+        serde_json::json!({
+            "type": "open_file",
+            "path": path.to_string_lossy(),
+            "request_id": "tui-fm-open",
+        }),
+    )?;
+    // Vänta in kvittensen så meddelandet hinner behandlas
+    let _ = read_msg(&mut stream);
+    Ok(())
+}
+
+#[cfg(not(unix))]
+fn open_via_socket(_sock: &str, _path: &Path) -> Result<(), String> {
+    Err("socket-öppning stöds inte på denna plattform ännu".to_string())
+}

src/ui.rs

@@ -533,6 +533,8 @@ fn draw_context_menu(f: &mut Frame, app: &App, menu: crate::app::ContextMenu) {
         // Use 2-char ASCII icon codes — emoji (U+1F000+) are 2-wide in terminals and
         // cause ghost characters and column drift when partially overwritten.
         let (icon, label, item_style): (&str, &str, Style) = match item {
+            ContextMenuItem::Open =>
+                ("O ", "Öppna",         Style::default().add_modifier(Modifier::BOLD)),
             ContextMenuItem::Copy =>
                 ("C ", "Kopiera",       Style::default()),
             ContextMenuItem::Cut =>