91 lines
2.5 KiB
Plaintext
91 lines
2.5 KiB
Plaintext
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#!/usr/bin/env bash
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# Make sure stdin and stdout are a tty.
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if [ ! -t 0 ] ; then
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exit 1
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fi
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if [ ! -t 1 ] ; then
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exit 1
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fi
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# Read some bytes from stdin. Pass the number of bytes to read as the first argument.
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function read_bytes()
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{
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numbytes=$1
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dd bs=1 count=$numbytes 2>/dev/null
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}
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function read_dsr() {
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# Reading response to DSR.
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dsr=""
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spam=$(read_bytes 2)
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byte=$(read_bytes 1)
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while [ "${byte}" != "n" ]; do
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dsr=${dsr}${byte}
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byte=$(read_bytes 1)
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done
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echo ${dsr}
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}
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# Extract the terminal name from DSR 1337
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function terminal {
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echo -n "$1" | sed -e 's/ .*//'
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}
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# Extract the version number from DSR 1337
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function version {
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echo -n "$1" | sed -e 's/.* //'
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}
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trap clean_up EXIT
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_STTY=$(stty -g) ## Save current terminal setup
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function clean_up() {
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stty "$_STTY" ## Restore terminal settings
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}
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# Prepare to silently read any (>=0) characters with no timeout.
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stty -echo -icanon raw min 0 time 0
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# Consume all pending input.
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while read none; do :; done
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# Reset the TTY, so it behaves as expected for the rest of the it2check script.
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clean_up
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# Enter raw mode and turn off echo so the terminal and I can chat quietly.
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stty -echo -icanon raw
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# Support for the extension first appears in this version of iTerm2:
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MIN_VERSION=2.9.20160304
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if [ $# -eq 1 ]; then
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MIN_VERSION=$1
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fi
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# Send iTerm2-proprietary code. Other terminals ought to ignore it (but are
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# free to use it respectfully). The response won't start with a 0 so we can
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# distinguish it from the response to DSR 5. It should contain the terminal's
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# name followed by a space followed by its version number and be terminated
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# with an n.
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echo -n '[1337n'
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# Report device status. Responds with esc [ 0 n. All terminals support this. We
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# do this because if the terminal will not respond to iTerm2's custom escape
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# sequence, we can still read from stdin without blocking indefinitely.
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echo -n '[5n'
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version_string=$(read_dsr)
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if [ -n "${version_string}" -a "${version_string}" != "0" -a "${version_string}" != "3" ]; then
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# Already read DSR 1337. Read DSR 5 and throw it away.
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dsr=$(read_dsr)
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else
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# Terminal didn't respond to the DSR 1337. The response we read is from DSR 5.
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version_string=""
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fi
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# Extract the terminal name and version number from the response.
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version=$(version "${version_string}")
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term=$(terminal "${version_string}")
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# Check if they match what we're looking for. This becomes the return code of the script.
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test "$term" = ITERM2 -a \( "$version" \> "$MIN_VERSION" -o "$version" = "$MIN_VERSION" \)
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