Tracking PyCharm/IntelliJ/CLion CSR issue

[dominick-han]

Describe the bug
enlighten doesn't seem to support "Terminal" in JetBrain's IDEs

To Reproduce
Run demo.py in the "Terminal" tab in PyCharm

Environment (please complete the following information):

• Enlighten Version: 1.6.2
• OS and version: MacOS 10.15.7
• Console application: PyCharm 2020.2.3
• Special Conditions: N/A

Additional context
Maybe I'm missing something? A brand new PyCharm install, and using the normal Terminal tab

[avylove]

I'm not sure why this isn't working, but I've been able to replicate it. I'll try to dig in and figure out what's happening.

[avylove]

It seems this is a bug in the pycharm terminal's handling of CSR. Here is a script to illustrate the issue.

import sys
import blessed

term = blessed.Terminal()

# Set scroll region
sys.stdout.write(term.csr(0, 5))

# Print a line at the top of the terminal
sys.stdout.write(term.move(0, 0))
sys.stdout.write("Top of terminal")

# Print a line near the bottom of the terminal
sys.stdout.write(term.move(term.height - 2, 0))
sys.stdout.write(term.clear_eol + "Bottom of terminal")

# Reset terminal
sys.stdout.write(term.csr(0, term.height - 1))
sys.stdout.write(term.move(term.height, 0))

In a standard terminal you'll see a message at the top and bottom of the terminal. In PyCharm, you see

[avylove]

I created an issue to track this
https://youtrack.jetbrains.com/issue/PY-44864

[dominick-han]

Thank you so much!
Would it (potentially) be an issue with blessed?

[avylove]

No, Blessed is just for convenience. On a terminal 25 lines high, this is the equivalent of

$ echo -en "\x1b[1;6r\x1b[1;1H\x1b[KTop of terminal\x1b[24;1H\x1b[KBottom of terminal\x1b[1;25r\x1b[26;1H"

or in Python

height = 25
print(f'\x1b[1;6r\x1b[1;1H\x1b[KTop of terminal\x1b[{height - 1};1H\x1b[KBottom of terminal\x1b[1;{height}r\x1b[{height + 1};1H', end='')