Open BridgeAR opened 2 years ago
@BridgeAR Can you link to info about that DECRQSS
?
@eabase In the Xterm escape sequence documentation it describes the general form as:
Request Status String
DECRQSS
DCS
$
q
Pt
ST
Pt
Designation " q DECSCA " p DECSCL r DECSTBM m SGR Xterm responds with
DCS
1
$
r
Pt
ST
for valid requests, replacing the Pt with the corresponding CSI string, or
DCS
0
$
r
Pt
ST
for invalid requests.
The original Xterm documentation used the convention of P
denoting a parameter string, with two sub-forms P1
... P9
being an array of numeric parameters; and Pt
meaning any byte sequence excluding BEL
and ST
.
Unfortunately the version on that page has lost the subscript and italicization so it just looks like Pt
. Where it mentions "the first parameter", that's Pt
within the DECRQSS
sequence.
Where it mentions "the corresponding CSI string", I think it simply means the Pt
parameter as supplied.
Example of DECRQSS
:
$ ( echo "Wait 2 seconds then hit ^D^D^D" > stty -echo > printf '\eP$qm\e\\' > hd > stty echo ) Wait 2 seconds then hit ^D^D^D 00000000 1b 50 31 24 72 30 6d 1b 5c |.P1$r0m.\| 00000009
or
$ ( echo "Wait 2 seconds then hit ^D^D^D" > stty -echo > printf '\eP$qq\e\\' > hd > stty echo ) Wait 2 seconds then hit ^D^D^D 00000000 18 |.| 00000001
I would like to discuss a similar command as
DECRQSS
that would be recommended to be implemented by commonly used terminals across different OS.That way there would be a reliable way to detect actual color support. For now it's not reliable at all by checking for environment variables.
I did not yet think of an ideal solution and would first like to know if there's interest in drafting such command.