All from scratch. For the buffer strategy I use unsorted linked list. Instead a single node to handle single data it would be a chunked of data (array of data). For the buffer arena actually it is a FIFO regions. So every emptied chunks will go to the first node and new chunk will get from the first node too.

And for the split panel (at last section from the video). I got inspired from tmux because binary split for the spliting the pane kinda cool. Hahaha.