[Feature]: Add GNU-Screen and tmux indication at PS1

[dr-costas]

Expected behavior

Have an indication of number of active GNU Screen or TMUX sessions at the PS1 when outside of GNU Screen or TMUX, and an indication of the name of the GNU Screen or TMUX session when inside GNU Screen or TMUX.

Current behavior

There is no indication of the number of active GNU Screen or TMUX sessions in PS1 when outside of each of those, and when inside there is no indication of the name of the current session.

Possible solution

No response

Context

No response

Notes

No response

[dr-costas]

Hey! Thank you for making this into a feature request. I have edited it to reflect my initial thoughts.

[dr-costas]

Updated the title because I just now saw that the title was empty...