From 28ce80211681c7a9c4ae8301523ebe6e6b76455a Mon Sep 17 00:00:00 2001
From: Matthew Gordon <matthew@gordon.earth>
Date: Thu, 27 Nov 2025 21:26:46 -0400
Subject: [PATCH] Implement EditorBuffer::move_cursor_to_line_number()

---
 core/src/editor_buffer/mod.rs | 57 +++++++++++++++++++++++++++++++++--
 1 file changed, 55 insertions(+), 2 deletions(-)

diff --git a/core/src/editor_buffer/mod.rs b/core/src/editor_buffer/mod.rs
index 1e4249f..9cc09d9 100644
--- a/core/src/editor_buffer/mod.rs
+++ b/core/src/editor_buffer/mod.rs
@@ -93,8 +93,8 @@ impl EditorBuffer {
         })
     }
 
-    fn move_cursor_to_line_number(&self, _line_num: usize) -> CommandResult {
-        todo!()
+    fn move_cursor_to_line_number(&self, line_num: usize) -> CommandResult {
+        self.move_cursor_to_point(Point::LineColumn(line_num, 0))
     }
 
     fn insert_char(&self, c: char) -> CommandResult {
@@ -321,4 +321,57 @@ mod tests {
             .collect();
         assert_eq!(expected_lines, found_lines);
     }
+
+    #[test]
+    fn insert_line() {
+        let mut test_file = create_simple_test_file();
+        let mut file_contents = String::new();
+        test_file
+            .read_to_string(&mut file_contents)
+            .expect("Reading text file");
+        let test_file = test_file;
+        let mut expected_lines: Vec<_> = file_contents.lines().collect();
+        expected_lines.insert(6, "abc 123".into());
+
+        let target = EditorBuffer::new();
+        let result = target.execute(Command::OpenFile(test_file.path().into()));
+        assert!(result.is_ok());
+        let target = result.buffer;
+        let result = target.execute(Command::MoveCursorToLine(7));
+        assert!(result.is_ok());
+        let target = result.buffer;
+        let result = target.execute(Command::InsertChar('a'));
+        assert!(result.is_ok());
+        let target = result.buffer;
+        let result = target.execute(Command::InsertChar('b'));
+        assert!(result.is_ok());
+        let target = result.buffer;
+        let result = target.execute(Command::InsertChar('c'));
+        assert!(result.is_ok());
+        let target = result.buffer;
+        let result = target.execute(Command::InsertChar(' '));
+        assert!(result.is_ok());
+        let target = result.buffer;
+        let result = target.execute(Command::InsertChar('1'));
+        assert!(result.is_ok());
+        let target = result.buffer;
+        let result = target.execute(Command::InsertChar('2'));
+        assert!(result.is_ok());
+        let target = result.buffer;
+        let result = target.execute(Command::InsertChar('3'));
+        assert!(result.is_ok());
+        let target = result.buffer;
+        let result = target.execute(Command::InsertChar('\n'));
+        assert!(result.is_ok());
+        let target = result.buffer;
+        let found_lines: Vec<String> = target
+            .buffer
+            .iter_chars()
+            .collect::<String>()
+            .lines()
+            .map(|l| l.into())
+            .collect();
+        assert_eq!(expected_lines, found_lines);
+        assert_eq!(Point::LineColumn(8, 0), target.get_cursor_position());
+    }
 }