#!/bin/bash

# Do terminals respond correctly to DECRQM (request info on a mode) for mode #80 (sixel display mode)?

mode=${1:-80}			# Use command line arg for mode optionally

# DEC Private Modes (lifted from Xterm ctlseqs)
Ps=()
Ps[1]="Application Cursor Keys (DECCKM), VT100."
Ps[2]="Designate US ASCII for character sets G0-G3 (DECANM), VT100."
Ps[3]="132 Column Mode (DECCOLM), VT100."
Ps[4]="Smooth (Slow) Scroll (DECSCLM), VT100."
Ps[5]="Reverse Video Screen (DECSCNM), VT100."
Ps[6]="Origin Mode (DECOM), VT100."
Ps[7]="Auto-Wrap Mode (DECAWM), VT100."
Ps[8]="Auto-Repeat Keys (DECARM), VT100."
Ps[9]="Send Mouse X & Y on button press.  (X10 xterm mouse protocol)."
Ps[10]="Show toolbar (rxvt)."
Ps[12]="Start blinking cursor (AT&T 610)."
Ps[13]="Start blinking cursor, xterm."
Ps[14]="Enable XOR of blinking cursor control sequence and menu."
Ps[18]="Print Form Feed (DECPFF), VT220."
Ps[19]="Set print extent to full screen (DECPEX), VT220."
Ps[25]="Text cursor enable (DECTCEM), VT220."
Ps[30]="Show scrollbar (rxvt)."
Ps[35]="Enable font-shifting functions (rxvt)."
Ps[38]="Enter Tektronix mode (DECTEK), VT240, xterm."
Ps[40]="Allow 80/132 mode, xterm."
Ps[41]="more(1) fix."
Ps[42]="Enable National Replacement Character sets (DECNRCM), VT220."
Ps[43]="Enable Graphics Expanded Print Mode (DECGEPM)."
Ps[44]="Turn on margin bell, xterm."
Ps[44]="Enable Graphics Print Color Mode (DECGPCM)."
Ps[45]="Reverse-wraparound mode, xterm."
Ps[45]="Enable Graphics Print ColorSpace (DECGPCS)."
Ps[46]="Start logging, xterm."
Ps[47]="Use Alternate Screen Buffer, xterm."
Ps[47]="Enable Graphics Rotated Print Mode (DECGRPM)."
Ps[66]="Application keypad mode (DECNKM), VT320"
Ps[67]="Backarrow key  sends  backspace  (DECBKM),  VT340,  VT420."
Ps[68]="Keyboard usage (DECKBUM)." 				# Not in xterm?
Ps[69]="Enable left and right margin mode (DECLRMM), VT420 and up."
Ps[80]="Enable Sixel Display Mode (DECSDM)."
Ps[95]="Do not clear screen when DECCOLM is set/reset (DECNCSM), VT510 and up."
Ps[1000]="Send  Mouse  X  &  Y  on  button  press  and  release.  (X11 xterm mouse protocol)."
Ps[1001]="Use Hilite Mouse Tracking, xterm."
Ps[1002]="Use  Cell  Motion  Mouse  Tracking, xterm."
Ps[1003]="Use  All  Motion  Mouse  Tracking, xterm."
Ps[1004]="Send FocusIn/FocusOut events, xterm."
Ps[1005]="Enable UTF-8 Mouse Mode, xterm."
Ps[1006]="Enable SGR Mouse Mode, xterm."
Ps[1007]="Enable Alternate  Scroll Mode, xterm."
Ps[1010]="Scroll to bottom on tty output (rxvt)."
Ps[1011]="Scroll to bottom on key  press (rxvt)."
Ps[1015]="Enable urxvt Mouse Mode."
Ps[1016]="Enable SGR Mouse PixelMode, xterm."
Ps[1034]="Interpret “meta” key, xterm. This sets the eighth bit of keyboard input."
Ps[1035]="Enable  special  modifiers  for  Alt  and  NumLock  keys, xterm."
Ps[1036]="Send ESC when Meta modifies  a  key, xterm."
Ps[1037]="Send DEL from the editing-keypad Delete key, xterm."
Ps[1039]="Send ESC when Alt modifies a key, xterm."
Ps[1040]="Keep selection even if not highlighted, xterm."
Ps[1041]="Use the CLIPBOARD selection, xterm."
Ps[1042]="Enable  Urgency windowmanager hint when Control-G received, xterm."
Ps[1043]="Enable raising of the window when Control-G is received, xterm."
Ps[1044]="Reuse  the  most  recent  data  copied  to  CLIPBOARD, xterm"
Ps[1046]="Enable  switching  to/from Alternate Screen Buffer, xterm."
Ps[1047]="Use Alternate  Screen  Buffer, xterm."
Ps[1048]="Save  cursor as in DECSC, xterm."
Ps[1049]="Save cursor as in DECSC, xterm. After saving the cursor, switch to the Alternate Screen Buffer, clearing  it  first.  This control combines the effects of the 1047 and 1048 modes."
Ps[1050]="Set terminfo/termcap function-key mode, xterm."
Ps[1051]="Set Sun function-key mode, xterm."
Ps[1052]="Set HP function-key mode, xterm."
Ps[1053]="Set SCO function-key mode, xterm."
Ps[1060]="Set legacy keyboard emulation, i.e, X11R6, xterm."
Ps[1061]="Set VT220 keyboard emulation, xterm."
Ps[2004]="Set bracketed paste mode, xterm."

status=("not recognized" "set" "reset" "permanently set" "permanently reset")

echo "Querying mode #$mode. ${Ps[$mode]}"

if ! IFS=";$" read -a REPLY -t 0.25 -s -p $'\e[?'$mode'$p' -d y; then
    echo Terminal did not respond.
    exit 1
fi

echo "${status[${REPLY[1]}]}"