feat: Optimize scrolling performance and reduce screen flickering

git_time_machine.py

@@ -23,6 +23,9 @@ def main(stdscr, filename):
     # Initialize colors if terminal supports them
     if curses.has_colors():
         curses.use_default_colors()  # Use terminal's default colors
+        
+    # Initialize key variable
+    key = 0
 
     commits = get_commits(filename)
     selected_commit = 0
@@ -32,13 +35,22 @@ def main(stdscr, filename):
 
     dragging_divider = False
 
+    # Initialize file content
+    commit_hash = commits[selected_commit].split()[0]
+    file_lines = get_file_at_commit(commit_hash, filename)
+    
+    # Enable nodelay for smoother scrolling
+    stdscr.nodelay(True)
+    
     while True:
-        stdscr.clear()
+        stdscr.erase()  # Use erase instead of clear for less flickering
         height, width = stdscr.getmaxyx()
 
-        # Fetch file content for selected commit
-        commit_hash = commits[selected_commit].split()[0]
-        file_lines = get_file_at_commit(commit_hash, filename)
+        # Only fetch file content when commit changes
+        if key in [curses.KEY_DOWN, curses.KEY_UP, ord('j'), ord('k')] and focus == "left":
+            commit_hash = commits[selected_commit].split()[0]
+            file_lines = get_file_at_commit(commit_hash, filename)
+            
         max_scroll = max(0, len(file_lines) - (height - 1))
         scroll_offset = min(scroll_offset, max_scroll)
         visible_lines = file_lines[scroll_offset:scroll_offset + height - 1]
@@ -57,9 +69,12 @@ def main(stdscr, filename):
         for y in range(height):
             stdscr.addch(y, divider_col, divider_char)
 
-        # Draw file content (right pane)
+        # Draw file content (right pane) - more efficiently
+        right_width = width - divider_col - 3
         for i, line in enumerate(visible_lines):
-            stdscr.addnstr(i, divider_col + 2, line, width - divider_col - 3)
+            # Only draw what fits in the window
+            if i < height - 1:
+                stdscr.addnstr(i, divider_col + 2, line, right_width)
 
         # Status bar for right pane
         visible_height = height - 1  # Reserve 1 line for the status bar
@@ -75,7 +90,13 @@ def main(stdscr, filename):
         x = width - len(status) - 1
         stdscr.addnstr(height - 1, x, status, len(status), curses.A_REVERSE)
 
+        # Get input with a small timeout for smoother scrolling
+        stdscr.timeout(50)  # 50ms timeout
         key = stdscr.getch()
+        
+        # If no key was pressed, continue the loop
+        if key == -1:
+            continue
 
         # Mouse interaction
         if key == curses.KEY_MOUSE: