Pastebin: get-termsize.bash

Format

Shell

Post date

2017-08-09 10:15

Publication Period

Unlimited

 #!/bin/bash
 
 die() {
         echo "$@"
         exit 1
 }
 
 printf "\e[18t"
 
 read -r -t 1 -n 3 resp
 [ $? -ne 0 ] && die "No response"
 
 CSI=$(printf "\x9b")
 ESC=$(printf "\e")
 
 case $resp in
 ${CSI}8\;)      : ;;
 ${ESC}\[8)
         read -r -t 1 -n 1 resp
         [ $? -ne 0 -o "$resp" != ";" ] && die "Invalid Response";;
 *)      echo "Invalid response";;
 esac
 
 state=0
 cols=0
 rows=0
 
 while [ $state -lt 3 ]; do
         read -r -t 1 -n 1 resp
         [ $? -ne 0 ] && die "Invalid Response"
 
         case $resp in
         [0-9])
                 if [ $state -eq 0 ]; then
                         rows=$((rows * 10 + resp))
                 elif [ $state -eq 1 ]; then
                         cols=$((cols * 10 + resp))
                 fi;;
         \;)     [ $state -lt 2 ] && state=$((++state));;
         t)      state=3;;
         *)      die "Invalid response";;
         esac
 done
 
 echo "COLUMNS=$cols"
 echo "ROWS=$rows"