Splits & multitasking

[curlpipe]

Being able to open multiple files in the same view together to work alongside each other.

This will lay the groundwork for more advanced features such as viewing diffs and a file tree.

• Use a tree-based structure for storing documents
  • Store proportions
  • Store list of documents
  • Store "ptr" for each split (to represent the tab within that split)
• Render the splits on the screen
  • Determine what to render where
  • Transplant the tree into the editor
  • Replace existing render with temp render methods that return strings
  • Implement render_line method in the editor that:
    • Takes a file container
    • Renders it to a certain length on a certain line (e.g., line 0, length 25)
    • Returns the rendered string
  • Replace existing rendering methods and update main render method
  • Piece together render_line parts into a cache and render the frame
  • Account for feedback line
  • Enable configurable tab line
  • Restore greeting message
  • Ensure rendering and behavior are EXACTLY as in version 0.7.1
• Implement render cache to store results of calculations (e.g., greeting message render, result of span, etc.)
• Add help message
• Split commands and API in the configuration file
• Include user interface to control them
  • Opening splits
  • Resizing splits
  • Moving ptr
• Fix broken things
  • Fix cursor position issues
  • Dodgy split distribution
    • Width
    • Height
  • Fix quitting and opening files
  • Fix issues with document x offset and incorrect document size
  • Ensure resize functionality works
  • Faulty status line values
  • Play nicely with the mouse feature
• Perform final check over ALL modified features to ensure they are working correctly
• Update documentation and README
  • Cover bulk editing
  • Cover splits