Basic save functionality

src/editor.rs

@@ -49,7 +49,9 @@ pub struct Editor {
 /// Keycode mapping enum
 #[derive(Copy, Clone, Debug, PartialEq)]
 pub enum EditorKey<T> {
+    Enter,
     Escape,
+    Backspace,
     ArrowLeft,
     ArrowRight,
     ArrowUp,
@@ -124,7 +126,9 @@ impl Editor {
 
         for char in in_str.chars() {
             input.push(match char {
+                '\x7f' => Backspace,
                 '\x1b' => Escape,
+                '\r' => Enter,
                 _ => OtherKey(char),
             });
         }
@@ -278,23 +282,19 @@ impl Editor {
         let key = self.read_key();
         if key.is_some() {
             let char = key.unwrap();
+
             match char {
-                OtherKey(c) => {
-                    if c == ctrl_key('q') {
-                        print!("\x1b[2J");
-                        print!("\x1b[H");
-                        // Break out of the input loop
-                        return None;
-                    }
+                Backspace => _del_or_backspace(Backspace),
+                Enter => {
+                    // TODO
                 }
-                DeleteKey => (),
                 Escape => (),
                 ArrowUp => self.move_cursor(&ArrowUp),
                 ArrowDown => self.move_cursor(&ArrowDown),
                 ArrowLeft => self.move_cursor(&ArrowLeft),
                 ArrowRight => self.move_cursor(&ArrowRight),
-                PageUp => self.page_up_or_down(PageUp),
-                PageDown => self.page_up_or_down(PageDown),
+                PageUp => self._page_up_or_down(PageUp),
+                PageDown => self._page_up_or_down(PageDown),
                 HomeKey => {
                     self.cursor_x = 0;
                 }
@@ -303,6 +303,26 @@ impl Editor {
                         self.cursor_x = self.rows[self.cursor_y].chars.len();
                     }
                 }
+                OtherKey(c) => {
+                    if c.is_ascii_control() {
+                        if c == ctrl_key('q') {
+                            print!("\x1b[2J");
+                            print!("\x1b[H");
+                            // Break out of the input loop
+                            return None;
+                        }
+
+                        if c == ctrl_key('s') {
+                            self.save();
+                        }
+
+                        if c == ctrl_key('h') {
+                            self._del_or_backspace(Backspace);
+                        }
+                    } else {
+                        self.insert_char(c);
+                    }
+                }
                 _ => (),
             };
 
@@ -313,7 +333,11 @@ impl Editor {
         Some(OtherKey('\0'))
     }
 
-    fn page_up_or_down(&mut self, key: EditorKey<char>) {
+    fn _del_or_backspace(&mut self, key: EditorKey<char>) {
+        // TODO
+    }
+
+    fn _page_up_or_down(&mut self, key: EditorKey<char>) {
         let mut times = self.screen_rows;
 
         // Update the cursor position
@@ -542,10 +566,46 @@ impl Editor {
         self.update_row(self.rows.len() - 1);
     }
 
+    fn row_insert_char(&mut self, row_index: usize, char_index: usize, ch: char) {
+        let mut at = char_index;
+        let row = &mut self.rows[row_index];
+
+        if at > row.chars.len() {
+            at = row.chars.len();
+        }
+
+        row.chars.insert(at, ch);
+
+        self.update_row(row_index);
+    }
+
+    // ------------------------------------------------------------------------
+    // Editor Operations
+    // ------------------------------------------------------------------------
+
+    fn insert_char(&mut self, ch: char) {
+        if self.cursor_y == self.rows.len() {
+            self.append_row("");
+        }
+
+        self.row_insert_char(self.cursor_y, self.cursor_x, ch);
+        self.cursor_x += 1;
+    }
+
     // ------------------------------------------------------------------------
     // File I/O
     // ------------------------------------------------------------------------
 
+    fn rows_to_string(&mut self) -> String {
+        let mut output = String::new();
+
+        for row in self.rows {
+            output.push_str(&row.chars)
+        }
+
+        output
+    }
+
     /// Open a file for display
     pub fn open(&mut self, filename: &str) -> io::Result<()> {
         self.filename = filename.to_owned();
@@ -560,4 +620,18 @@ impl Editor {
 
         Ok(())
     }
+
+    fn save(&mut self) -> io::Result<()> {
+        if self.filename.len() == 0 {
+            return Ok(())
+        }
+
+        let mut file = File::create(&self.filename)?;
+        let data = &mut self.rows_to_string();
+
+        file.write_all(data.as_bytes())?;
+        file.sync_all()?;
+
+        Ok(())
+    }
 }