erd -p doesnotexist deadlocks, rejects ^C, and doesn't properly restore terminal

[vincentdephily]

Running erd -p doesnotexist anywhere prints Preparing output... and then just sits there forever, consuming no CPU. It also doesn't exit on a ^C. This can be worked around with a ^Z followed by a kill %1 but this leaves the terminal in a "cursor not visible" state, requiring an extra reset to get back to normal.

Running erg -p doesnotexist --no-progress immediately prints No entries to show with given arguments. and exits.

Expected:

• erd -p doesnotexist should exit immediately.
• Hitting ^C at any point during erd execution should work, and restore terminal settings.

[solidiquis]

Thanks for catching this. Shipping a patch immediately.

[solidiquis]

https://github.com/solidiquis/erdtree/releases/tag/v3.1.1