48 lines
1.1 KiB
Bash
Executable File
48 lines
1.1 KiB
Bash
Executable File
#!/usr/bin/env bash
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set -euo pipefail
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# Ensure in a interactive terminal
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[ ! -t 0 ] && exit 1
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# Construct query
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QUERY_CODE=$(printf "\033]1337;ReportCellSize\a")
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EXPECTED_RESPONSE=$(printf "\033]1337;") # followed by "ReportCellSize=...", but only the prefix is enough
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# Construct fence code that most terminals will respond to
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# to ensure that at least something will be sent back and
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# to detect the end of the response
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FENCE_CODE=$(printf "\033[c")
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# Set terminal to raw mode
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stty_orig=$(stty -g < /dev/tty)
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trap 'stty "$stty_orig" < /dev/tty' EXIT INT TERM HUP
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stty -echo -icanon min 1 time 0
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printf "%s%s" "$QUERY_CODE" "$FENCE_CODE" > /dev/tty
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response=""
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ret=1
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while true; do
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IFS= read -r -N 1 -t 0.3 char < /dev/tty || {
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[ -z "$char" ] && break
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}
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response+="$char"
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if [[ "$response" == *"$EXPECTED_RESPONSE"* ]]; then
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ret=0
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# Keep reading until response is complete to
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# avoid leaving unread data in the terminal
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fi
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if [[ "$response" == *$'\033['*'c' ]]; then
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break
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fi
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if [ ${#response} -gt 1024 ]; then
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break
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fi
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done
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exit $ret
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