Export/print marks to stdout

README.md

@@ -31,6 +31,7 @@ Key | Action
 `Ctrl + l` | Scroll one window right
 `Ctrl + ←` | Scroll left to first column
 `Ctrl + →` | Scroll right to last column
+`Ctrl + e` | Print the marked lines to stdout and exit
 `G` (or `End`) | Go to bottom
 `g` (or `Home`) | Go to top
 `<n>G` | Go to line `n`

src/app.rs

@@ -332,6 +332,11 @@ impl App {
             {
                 return Ok(Some(result));
             }
+            if matches!(control, Control::SelectMarks)
+                && let Some(result) = self.get_marked_rows()
+            {
+                return Ok(Some(result));
+            }
             if matches!(control, Control::Help) {
                 self.help_page_state.activate();
                 self.input_handler.enter_help_mode();
@@ -747,6 +752,27 @@ impl App {
         None
     }
 
+    fn get_marked_rows(&mut self) -> Option<String> {
+        let marked = self.rows_view.marked_rows();
+        if marked.is_empty() {
+            return None;
+        }
+
+        let mut record_numbers: Vec<usize> = marked.iter().copied().collect();
+        record_numbers.sort_unstable();
+
+        let headers_line = self.rows_view.get_headers_line();
+        match self.rows_view.get_rows_values(&record_numbers) {
+            Ok(lines) => {
+                let mut content_lines = Vec::with_capacity(lines.len().saturating_add(1));
+                content_lines.push(headers_line);
+                content_lines.extend(lines);
+                Some(content_lines.join("\n"))
+            }
+            Err(_) => None,
+        }
+    }
+
     fn get_finder_starting_row_index(&self) -> usize {
         self.rows_view.selected_offset().unwrap_or(0) as usize
     }

src/help.rs

@@ -55,6 +55,7 @@ r                       : Reset to default view (clear all filters and custom co
 H (or ?)                : Display this help
 m                       : Mark / unmark the selected row visually
 M                       : Clear all row marks
+Ctrl + m                : Print the marked rows (with header) to stdout and exit
 q                       : Exit";
 
 pub struct HelpPage {}

src/input.rs

@@ -38,6 +38,7 @@ pub enum Control {
     BufferReset,
     Select,
     CopySelection,
+    SelectMarks,
     ToggleSelectionType,
     ToggleLineWrap(WrapMode),
     ToggleMark,
@@ -196,6 +197,7 @@ impl InputHandler {
                 KeyCode::Left => Control::ScrollLeftMost,
                 KeyCode::Right => Control::ScrollRightMost,
                 KeyCode::Char('j') => Control::ToggleNaturalSort,
+                KeyCode::Char('e') => Control::SelectMarks,
                 _ => Control::Nothing,
             },
             _ => Control::Nothing,

src/view.rs

@@ -367,6 +367,34 @@ impl RowsView {
         None
     }
 
+    pub fn get_headers_line(&self) -> String {
+        self.headers()
+            .iter()
+            .map(|h| h.name.clone())
+            .collect::<Vec<_>>()
+            .join("\t")
+    }
+
+    pub fn get_rows_values(&mut self, record_numbers: &[usize]) -> CsvlensResult<Vec<String>> {
+        if record_numbers.is_empty() {
+            return Ok(vec![]);
+        }
+
+        // marked rows store 1-based record numbers; convert to 0-based indices for fetching
+        let indices: Vec<u64> = record_numbers
+            .iter()
+            .map(|&n| n.saturating_sub(1) as u64)
+            .collect();
+
+        let (mut rows, _) = self.reader.get_rows_for_indices(&indices)?;
+
+        if let Some(columns_filter) = &self.columns_filter {
+            rows = Self::subset_columns(&rows, columns_filter.indices());
+        }
+
+        Ok(rows.into_iter().map(|row| row.fields.join("\t")).collect())
+    }
+
     pub fn num_rows(&self) -> u64 {
         self.num_rows
     }