I'm in the fairly early stages of developing a Node.js based BBS (yes, really!), and in doing so need to recognize and understand the differences in which various terminals and Telnet clients such as SyncTERM handle ANSI control/escape sequences.
As of now, this entry is mostly a placeholder, but I will update it as these are found.
Clients & Terminals
Here are some of the terminals in which I'd like my system to work with:
Clearing the Screen
Some client/terminals seem to both clear and go home (position 1,1) while others simply clear:
- SyncTERM: Clear+Home
- mTCP telnet: Clear+Home
- telnet under iTerm2, rxvt, PuTTY: Clear only
Workaround: ESC[2J + ESC[H
Bonus: ESC[0m + ESC[2J + ESC[H for DOS style "cls".
Thanks to Michael Griffin for pointing out my typos!
Terminal Size Negotiation
Most terminals tested seem to support one or more ways to negotiate terminal size: NAWS, ENV, and/or nonstandard ANSI device status report of ESC[255n.
Netrunner currently returns Telnet "wont"'s in response to NAWS and ENV and gives a response of 1x1 for ESC[255n -- not particularly useful. In this case, I'm defaulting to 80x24.
...to be continued.