From 49576015293bf91ba825dbbcc9c305d9d38f7ed1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Kacper=20Macio=C5=82ek?= <kacper.maciolek00@gmail.com>
Date: Wed, 19 Jun 2024 20:45:58 +0200
Subject: [PATCH] new line fix

---
 src/app.rs        |  9 +++------
 src/gap_buffer.rs | 12 ++++--------
 src/ui.rs         |  2 +-
 3 files changed, 8 insertions(+), 15 deletions(-)

diff --git a/src/app.rs b/src/app.rs
index ae0de22..39a7294 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -43,7 +43,7 @@ impl Default for App {
     fn default() -> Self {
         Self {
             running: true,
-            content: vec![],
+            content: vec![GapBuffer::new(80)],
             cursor_position: Position { x: 0, y: 0 },
             cursor_offset: Position { x: 0, y: 0 },
             opened_filename: String::new(),
@@ -187,17 +187,14 @@ impl App {
             self.push_to_content(GapBuffer::new(GAP_BUFFER_DEFAULT_SIZE));
         }
 
-        let current_line = &mut self.content[self.cursor_position.y];
+        let current_line = &mut self.content[pos.y];
 
         if current_line.len() > pos.x {
             let new_line = current_line.split_off(pos.x);
 
             self.insert_to_content(pos.y + 1, new_line);
         } else {
-            self.insert_to_content(
-                self.cursor_position.y + self.cursor_offset.y + 1,
-                GapBuffer::new(GAP_BUFFER_DEFAULT_SIZE),
-            );
+            self.insert_to_content(pos.y + 1, GapBuffer::new(GAP_BUFFER_DEFAULT_SIZE));
         }
 
         self.cursor_position.x = 0;
diff --git a/src/gap_buffer.rs b/src/gap_buffer.rs
index 2b9a522..9dfb8fe 100644
--- a/src/gap_buffer.rs
+++ b/src/gap_buffer.rs
@@ -29,17 +29,13 @@ impl GapBuffer {
     fn resize(&mut self) {
         let new_capacity = self.buffer.len() * 2;
         let mut new_buffer = vec![' '; new_capacity];
-        let gap_size = self.gap_end - self.gap_start;
 
-        if self.gap_start > 0 {
-            new_buffer[..self.gap_start].copy_from_slice(&self.buffer[..self.gap_start]);
-        }
+        new_buffer[..self.gap_start].copy_from_slice(&self.buffer[..self.gap_start]);
 
-        if self.gap_end < self.buffer.len() {
-            new_buffer[new_capacity - gap_size..].copy_from_slice(&self.buffer[self.gap_end..]);
-        }
+        let new_gap_end = new_capacity - (self.buffer.len() - self.gap_end);
+        new_buffer[new_gap_end..].copy_from_slice(&self.buffer[self.gap_end..]);
 
-        self.gap_end = new_capacity - gap_size;
+        self.gap_end = new_gap_end;
         self.buffer = new_buffer;
     }
 
diff --git a/src/ui.rs b/src/ui.rs
index d9247a2..ab52488 100644
--- a/src/ui.rs
+++ b/src/ui.rs
@@ -36,7 +36,7 @@ pub fn render(app: &mut App, frame: &mut Frame) {
         } else {
             (1..=pos.y)
                 .rev()
-                .chain(std::iter::once(pos.y))
+                .chain(std::iter::once(pos.y + 1))
                 .chain(1..=app.content.len().saturating_sub(pos.y + 1))
                 .collect::<Vec<_>>()
         }