Add scope-based selection and credits

- Selection keys (+/-/*) now work on current scope (parent dataset)
- Add author credits: Florian Schermer, DATAZONE GmbH
- Update help text and README with scope documentation

README.md

@@ -91,11 +91,11 @@ zfsdu
 | **Tree** | |
 | e | Expand all |
 | c | Collapse all |
-| **Selection** | |
+| **Selection (current scope)** | |
 | Space | Mark/unmark snapshot |
-| + | Select all visible snapshots |
-| - | Unselect all visible snapshots |
-| * | Invert selection |
+| + | Select all in scope |
+| - | Unselect all in scope |
+| * | Invert selection in scope |
 | **Search & Filter** | |
 | / | Search (n=next, N=prev) |
 | f | Filter visible items |
@@ -141,6 +141,11 @@ search_match = "lightred"
 - Terminal with UTF-8 support
 - Root privileges (for snapshot deletion)
 
+## Author
+
+**Florian Schermer**
+[DATAZONE GmbH](https://datazone.de)
+
 ## License
 
 CDDL (Common Development and Distribution License) - same as OpenZFS.

src/app.rs

@@ -561,11 +561,23 @@ impl App {
         self.search_matches.contains(&real_index)
     }
 
-    // Select/Unselect Group (like MC)
+    // Select/Unselect Group (like MC) - works in current scope
     pub fn select_group(&mut self) {
+        let current_parent = if let Some(real_idx) = self.nth_visible(self.selected) {
+            self.tree_items.get(real_idx).map(|ti| ti.parent_path.clone())
+        } else {
+            None
+        };
+
         let mut count = 0;
         for ti in &self.tree_items {
             if ti.visible && ti.item.is_snapshot() {
+                let in_scope = match &current_parent {
+                    Some(parent) => &ti.parent_path == parent,
+                    None => true,
+                };
+
+                if in_scope {
                     let name = ti.item.full_name().to_string();
                     if !self.marked.contains(&name) {
                         self.marked.push(name);
@@ -573,13 +585,28 @@ impl App {
                     }
                 }
             }
+        }
         self.message = Some(format!("Selected {} snapshot(s)", count));
     }
 
     pub fn unselect_group(&mut self) {
+        let current_parent = if let Some(real_idx) = self.nth_visible(self.selected) {
+            self.tree_items.get(real_idx).map(|ti| ti.parent_path.clone())
+        } else {
+            None
+        };
+
         let visible_names: Vec<String> = self.tree_items
             .iter()
-            .filter(|ti| ti.visible && ti.item.is_snapshot())
+            .filter(|ti| {
+                if !ti.visible || !ti.item.is_snapshot() {
+                    return false;
+                }
+                match &current_parent {
+                    Some(parent) => &ti.parent_path == parent,
+                    None => true,
+                }
+            })
             .map(|ti| ti.item.full_name().to_string())
             .collect();
 
@@ -590,17 +617,34 @@ impl App {
     }
 
     pub fn invert_selection(&mut self) {
+        // Get current scope (parent dataset of selected item)
+        let current_parent = if let Some(real_idx) = self.nth_visible(self.selected) {
+            self.tree_items.get(real_idx).map(|ti| ti.parent_path.clone())
+        } else {
+            None
+        };
+
+        let mut count = 0;
         for ti in &self.tree_items {
+            // Only invert in current scope (same parent)
             if ti.visible && ti.item.is_snapshot() {
+                let in_scope = match &current_parent {
+                    Some(parent) => &ti.parent_path == parent,
+                    None => true, // If no parent, work on all visible
+                };
+
+                if in_scope {
                     let name = ti.item.full_name().to_string();
                     if let Some(pos) = self.marked.iter().position(|x| x == &name) {
                         self.marked.remove(pos);
                     } else {
                         self.marked.push(name);
+                        count += 1;
                     }
                 }
             }
-        self.message = Some(format!("{} snapshot(s) marked", self.marked.len()));
+        }
+        self.message = Some(format!("Inverted {} in scope", count));
     }
 
     // Expand all datasets

src/main.rs

@@ -75,7 +75,7 @@ fn print_help() {
     println!("    ↑/k, ↓/j         Navigate up/down");
     println!("    Enter/l          Expand/collapse dataset");
     println!("    Space            Mark/unmark snapshot");
-    println!("    +/-/*            Select/unselect/invert");
+    println!("    +/-/*            Select/unselect/invert (in scope)");
     println!("    s                Toggle sort (Size/Date/Name)");
     println!("    /                Search");
     println!("    f                Filter");
@@ -88,6 +88,9 @@ fn print_help() {
     println!();
     println!("CONFIG:");
     println!("    ~/.config/zfsdu/config.toml");
+    println!();
+    println!("(c) Florian Schermer - DATAZONE GmbH");
+    println!("https://datazone.de");
 }
 
 fn run_app<B: ratatui::backend::Backend>(terminal: &mut Terminal<B>, app: &mut App) -> Result<()> {

src/ui.rs

@@ -407,11 +407,11 @@ fn draw_help(f: &mut Frame, app: &App) {
         "    e              Expand all",
         "    c              Collapse all",
         "",
-        "  Selection:",
+        "  Selection (current scope):",
         "    Space          Mark/unmark snapshot",
-        "    +              Select all visible snapshots",
-        "    -              Unselect all visible snapshots",
-        "    *              Invert selection",
+        "    +              Select all in scope",
+        "    -              Unselect all in scope",
+        "    *              Invert selection in scope",
         "",
         "  Search & Filter:",
         "    /              Search (n=next, N=prev)",
@@ -431,6 +431,9 @@ fn draw_help(f: &mut Frame, app: &App) {
         "",
         "  Config: ~/.config/zfsdu/config.toml",
         "",
+        "  (c) Florian Schermer - DATAZONE GmbH",
+        "  https://datazone.de",
+        "",
         "  Press any key to close",
     ];