From bc6ec6d847f1b416ca53796ef0e6eac308fb746a Mon Sep 17 00:00:00 2001
From: "n loewen (aider)" <n@nloewen.com>
Date: Mon, 5 May 2025 09:18:18 +0100
Subject: [PATCH] feat: implement vertical scrolling for commit list in left
 pane

---
 git_time_machine.py | 62 +++++++++++++++++++++++++++++++++++----------
 1 file changed, 49 insertions(+), 13 deletions(-)

diff --git a/git_time_machine.py b/git_time_machine.py
index f36e7fb..1ea828a 100644
--- a/git_time_machine.py
+++ b/git_time_machine.py
@@ -32,6 +32,7 @@ def main(stdscr, filename):
     divider_col = 40
     focus = "left"
     scroll_offset = 0
+    left_scroll_offset = 0  # Scroll position for left pane
 
     dragging_divider = False
 
@@ -55,13 +56,24 @@ def main(stdscr, filename):
         scroll_offset = min(scroll_offset, max_scroll)
         visible_lines = file_lines[scroll_offset:scroll_offset + height - 1]
 
+        # Calculate visible commits for left pane
+        left_max_scroll = max(0, len(commits) - (height - 1))
+        left_scroll_offset = min(left_scroll_offset, left_max_scroll)
+        
+        # Ensure selected commit is visible
+        if selected_commit < left_scroll_offset:
+            left_scroll_offset = selected_commit
+        elif selected_commit >= left_scroll_offset + height - 1:
+            left_scroll_offset = selected_commit - (height - 2)
+            
         # Draw commit list (left pane)
-        for i in range(min(len(commits), height - 1)):
-            line = commits[i]
-            if i == selected_commit:
+        visible_commits = commits[left_scroll_offset:left_scroll_offset + height - 1]
+        for i, line in enumerate(visible_commits):
+            display_index = i + left_scroll_offset
+            if display_index == selected_commit:
                 stdscr.attron(curses.A_REVERSE)  # Highlight selected commit
             stdscr.addnstr(i, 0, line, divider_col - 1)
-            if i == selected_commit:
+            if display_index == selected_commit:
                 stdscr.attroff(curses.A_REVERSE)
 
         # Vertical divider
@@ -76,19 +88,31 @@ def main(stdscr, filename):
             if i < height - 1:
                 stdscr.addnstr(i, divider_col + 2, line, right_width)
 
-        # Status bar for right pane
+        # Status bars for both panes
         visible_height = height - 1  # Reserve 1 line for the status bar
+        
+        # Right pane status
         last_visible_line = scroll_offset + visible_height
-
         if len(file_lines) > 0:
-            percent = int((last_visible_line / len(file_lines)) * 100)
-            percent = 100 if last_visible_line >= len(file_lines) else percent
+            right_percent = int((last_visible_line / len(file_lines)) * 100)
+            right_percent = 100 if last_visible_line >= len(file_lines) else right_percent
         else:
-            percent = 0
-
-        status = f"{percent}%"
-        x = width - len(status) - 1
-        stdscr.addnstr(height - 1, x, status, len(status), curses.A_REVERSE)
+            right_percent = 0
+        right_status = f"{right_percent}%"
+        
+        # Left pane status
+        last_visible_commit = left_scroll_offset + visible_height
+        if len(commits) > 0:
+            left_percent = int((last_visible_commit / len(commits)) * 100)
+            left_percent = 100 if last_visible_commit >= len(commits) else left_percent
+        else:
+            left_percent = 0
+        left_status = f"{left_percent}%"
+        
+        # Draw status bars
+        stdscr.addnstr(height - 1, 1, left_status, len(left_status), curses.A_REVERSE)
+        x = width - len(right_status) - 1
+        stdscr.addnstr(height - 1, x, right_status, len(right_status), curses.A_REVERSE)
 
         # Get input with a small timeout for smoother scrolling
         stdscr.timeout(50)  # 50ms timeout
@@ -140,6 +164,18 @@ def main(stdscr, filename):
                 if selected_commit > 0:
                     selected_commit -= 1
                     scroll_offset = 0
+            elif key in [curses.KEY_NPAGE, ord(' ')]:
+                # Page down in left pane
+                new_selected = min(selected_commit + height - 1, len(commits) - 1)
+                if new_selected != selected_commit:
+                    selected_commit = new_selected
+                    scroll_offset = 0
+            elif key in [curses.KEY_PPAGE, 8, 127, curses.KEY_SR]:
+                # Page up in left pane
+                new_selected = max(0, selected_commit - (height - 1))
+                if new_selected != selected_commit:
+                    selected_commit = new_selected
+                    scroll_offset = 0
 
         # Right pane scrolling
         elif focus == "right":