implement passable #[command]

src/device/browse.rs

@@ -1,6 +1,17 @@
 use crate::*;
 
-def_command!(FileBrowserCommand: |sampler: Sampler|{
+impl App {
+    /// Return reference to content browser if open.
+    ///
+    /// ```
+    /// assert_eq!(tek::App::default().browser(), None);
+    /// ```
+    pub fn browser (&self) -> Option<&Browse> {
+        if let Dialog::Browse(_, ref b) = self.dialog { Some(b) } else { None }
+    }
+}
+
+def_command!(FileBrowserCommand: |_browse: Browse|{
     //("begin"   []            Some(Self::Begin))
     //("cancel"  []            Some(Self::Cancel))
     //("confirm" []            Some(Self::Confirm))
@@ -539,3 +550,20 @@ def_command!(CropCommand: |pool: Pool| {
         Ok(None)
     }
 });
+
+pub fn scan (dir: &PathBuf) -> Usually<(Vec<OsString>, Vec<OsString>)> {
+    let (mut subdirs, mut files) = std::fs::read_dir(dir)?
+        .fold((vec!["..".into()], vec![]), |(mut subdirs, mut files), entry|{
+            let entry = entry.expect("failed to read drectory entry");
+            let meta = entry.metadata().expect("failed to read entry metadata");
+            if meta.is_file() {
+                files.push(entry.file_name());
+            } else if meta.is_dir() {
+                subdirs.push(entry.file_name());
+            }
+            (subdirs, files)
+        });
+    subdirs.sort();
+    files.sort();
+    Ok((subdirs, files))
+}

src/device/dialog.rs

@@ -33,6 +33,7 @@ pub fn draw_dialog (
 }
 
 impl App {
+
     pub fn get_dialog (&self, src: impl Language) -> Perhaps<Dialog> {
         src.word()?.map(|word|Ok(match word {
             ":dialog/none"          => Dialog::None,
@@ -64,31 +65,36 @@ impl App {
             )
         })).transpose()
     }
-    /// Set modal dialog.
+
+    /// Set currently active modal dialog.
     ///
     /// ```
-    /// let previous: tek::Dialog = tek::App::default().set_dialog(tek::Dialog::welcome());
+    /// let previous: tek::Dialog = tek::App::default().set_dialog(&tek::Dialog::welcome());
     /// ```
-    pub fn set_dialog (&mut self, mut dialog: Dialog) -> Dialog {
+    pub fn set_dialog (&mut self, dialog: &Dialog) -> Dialog {
+        let mut dialog = dialog.clone();
         std::mem::swap(&mut self.dialog, &mut dialog);
         dialog
     }
+
     pub fn inc (&mut self, axis: &ControlAxis) -> Perhaps<AppCommand> {
         Ok(match (&self.dialog, axis) {
             (Dialog::None, _) => todo!(),
             (Dialog::Menu(_, _), ControlAxis::Y) =>
-                AppCommand::SetDialog { dialog: self.dialog.menu_next() }.act(self)?,
+                AppCommand::SetDialog(self.dialog.menu_next()).act(self)?,
             _ => todo!()
         })
     }
+
     pub fn dec (&mut self, axis: &ControlAxis) -> Perhaps<AppCommand> {
         Ok(match (&self.dialog, axis) {
             (Dialog::None, _) => None,
             (Dialog::Menu(_, _), ControlAxis::Y) =>
-                AppCommand::SetDialog { dialog: self.dialog.menu_prev() }.act(self)?,
+                AppCommand::SetDialog(self.dialog.menu_prev()).act(self)?,
             _ => todo!()
         })
     }
+
     pub fn confirm (&mut self) -> Perhaps<AppCommand> {
         Ok(match &self.dialog {
             Dialog::Menu(index, items) => {