109 lines
2.6 KiB
Bash
Executable File
109 lines
2.6 KiB
Bash
Executable File
#!/bin/bash
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# Reset terminal to current state when we exit.
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trap "stty $(stty -g)" EXIT
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# Disable echo and special characters, set input timeout to 0.2 seconds.
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stty -echo -icanon time 2 || exit $?
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# String containing all keypresses.
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KEYS=""
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# Set field separator to BELL (should not occur in keypresses)
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IFS=$'\a'
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# Input loop.
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while [ 1 ]; do
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# Read more input from keyboard when necessary.
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while read -t 0 ; do
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read -s -r -d "" -N 1 -t 0.2 CHAR && KEYS="$KEYS$CHAR" || break
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done
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# If no keys to process, wait 0.05 seconds and retry.
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if [ -z "$KEYS" ]; then
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sleep 0.02
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continue
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fi
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# Check the first (next) keypress in the buffer.
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case "$KEYS" in
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$'\x1B\x5B\x41'*) # Up arrow
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KEYS="${KEYS##???}"
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KEY="Arrow_U"
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;;
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$'\x1B\x5B\x42'*) # Down Arrow
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KEYS="${KEYS##???}"
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KEY="Arrow_D"
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;;
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$'\x1B\x5B\x44'*) # Left Arrow
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KEYS="${KEYS##???}"
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KEY="Arrow_L"
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;;
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$'\x1B\x5B\x43'*) # Right Arrow
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KEYS="${KEYS##???}"
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KEY="Arrow_R"
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;;
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$'\x1B\x4F\x48'*) # Home
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KEYS="${KEYS##???}"
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KEY="Home"
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;;
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$'\x1B\x5B\x31\x7E'*) # Home (Numpad)
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KEYS="${KEYS##????}"
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KEY="Home"
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;;
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$'\x1B\x4F\x46'*) # End
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KEYS="${KEYS##???}"
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KEY="End"
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;;
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$'\x1B\x5B\x34\x7E'*) # End (Numpad)
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KEYS="${KEYS##????}"
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KEY="End"
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;;
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$'\x1B\x5B\x45'*) # 5 (Numpad)
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KEYS="${KEYS#???}"
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KEY="Numpad_5"
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;;
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$'\x1B\x5B\x35\x7e'*) # PageUp
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KEYS="${KEYS##????}"
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KEY="Page_U"
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;;
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$'\x1B\x5B\x36\x7e'*) # PageDown
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KEYS="${KEYS##????}"
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KEY="Page_D"
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;;
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$'\x1B\x5B\x32\x7e'*) # Insert
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KEYS="${KEYS##????}"
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KEY="Insert"
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;;
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$'\x1B\x5B\x33\x7e'*) # Delete
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KEYS="${KEYS##????}"
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KEY="Delete"
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;;
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$'\n'*|$'\r'*) # Enter/Return
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KEYS="${KEYS##?}"
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KEY="Enter"
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;;
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$'\t'*) # Tab
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KEYS="${KEYS##?}"
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KEY="Tab"
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;;
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$'\x1B') # Esc (without anything following!)
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KEYS="${KEYS##?}"
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exit 0
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;;
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$'\x1B'*) # Unknown escape sequences
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echo -n "Unknown escape sequence (${#KEYS} chars): \$'"
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echo -n "$KEYS" | od --width=256 -t x1 | sed -e '2,99 d; s|^[0-9A-Fa-f]* ||; s| |\\x|g; s|$|'"'|"
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KEYS=""
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;;
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[$'\x01'-$'\x1F'$'\x7F']*) # Consume control characters
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KEYS="${KEYS##?}"
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;;
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*) # Printable characters.
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KEY="${KEYS:0:1}"
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KEYS="${KEYS#?}"
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;;
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esac
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echo "$KEY"
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done
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