The vim-boxdraw plugin makes it easy to draw simple ASCII diagrams in blockwise-visual mode. The basic idea is simple:

• Select a rectangle on the screen
• Invoke a draw command.

All commands are mapped to the + prefix. See the vim help file for reference.

vim-boxdraw uses a Python script to do most of the work. To contribute to this plugin, you'll need

• Python 2.7.x and 3.5.x (we want to support system Python on most platforms)
• pip install -U pytest

From the python directory,

pytest