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|
# =================
# read_chars.bash
# =================
#
# Bash library for reading from tty and writing to standard out.
# Can be suspended and resumed from bash (or with unix job control in
# any shell).
#
# exporting for users:
#
# read_chars() <-- calls readchar in a loop
#
# readchar() <-- reads one character
#
# readchar_init() <-- must be called before readchar() in the same subshell
#
# The function read_chars is also available as the executable read-tty
cfmakeraw()
{
cmd=(stty -ignbrk -brkint -parmrk -istrip -inlcr -igncr -icrnl
-ixon -opost -echo -echonl -icanon -isig -iexten -parenb cs8)
"${cmd[@]}" "$@" >/dev/null
}
i()
{
if [ "$DEBUG" ]
then
printf 'I: %s\n' "$*" >&2
fi
}
x()
{
if [ "$DEBUG" ]
then
printf '+ %s\n' "${*@Q}" >&2
fi
"$@"
}
readchar_init()
{
declare -g SOCAT= SOCAT_PID=
declare -g t
declare -g -a readchar_termopts
[ -t 1 ] && t=y || t=
readchar_termopts=(
opost onlcr isig
intr undef
quit undef
)
trap "i EXIT; kill $SOCAT_PID 2>/dev/null; kill -CONT $SOCAT_PID 2>/dev/null" EXIT
trap "i CONT; readchar_SIGCONT" CONT
for sig in TSTP TTIN TTOU
do
trap "i $sig; x kill -STOP \$BASHPID \$SOCAT_PID 2>/dev/null" $sig
done
for sig in INT TERM
do
trap "i $sig; exit" $sig
done
}
readchar_SIGCONT()
{
if check_foreground
then
if [ -t 0 ]
then
x cfmakeraw "${readchar_termopts[@]}"
fi
x kill -CONT $SOCAT_PID 2>/dev/null
else
x kill -STOP $BASHPID $SOCAT_PID 2>/dev/null
fi
}
check_foreground()
{
read _pid _comm _state _ppid pgrp _session _tty_nr tpgid _rest < /proc/self/stat
[ "$tpgid" = "$pgrp" ]
}
SOCAT()
{
#BASH_ARGV0=socat-tty-sleeper
#echo -n "$0" >/proc/$BASHPID/comm
#trap 'sleep .25' SIGTSTP
#trap 'kill -INT $BASHPID 0' SIGTTIN SIGTTOU
exec -a user-ended-connection socat - -
}
readchar()
{
declare -n REPLY="${1:-CHARACTER}"
if [ -t 0 ]
then
if check_foreground
then
if ! [ "$SOCAT_PID" ]
then
x cfmakeraw "${readchar_termopts[@]}"
fi
else
sleep .25
return
fi
fi
if ! [ "$SOCAT_PID" ]
then
exec {SOCAT}< <(SOCAT)
SOCAT_PID=$!
fi
if POSIXLY_CORRECT=y read -n 1 -d '' -r -s -u "$SOCAT"
then
if [ "$t" ]
then
printf -v quoted_reply "%s" "${REPLY@Q}"
if (( (count += 1 + ${#quoted_reply}) < ${COLUMNS:-80} - 10 ))
then
seperate=' '
else
seperate=$'\n'
count=0
fi
printf "%s" "$seperate" "$quoted_reply"
else
if [ "$REPLY" ]
then
printf "%s" "$REPLY"
else
printf "\0"
fi
fi
else
[ $? -gt 128 ]
fi
}
read_chars()
{
readchar_init
while readchar
do
continue
done
}
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