telegram-bot-bash/modules/background.sh

#!/bin/bash
# file: modules/background.sh
# do not edit, this file will be overwritten on update

# This file is public domain in the USA and all free countries.
# Elsewhere, consider it to be WTFPLv2. (wtfpl.net/txt/copying)
#
#### $$VERSION$$ v0.80-dev3-1-gbccd064

# source from commands.sh if you want ro use interactive or background jobs

######
# interactive and background functions

# old syntax as aliases
background() {
	start_back "${CHAT[ID]}" "$1" "$2"
}
startproc() {
	start_proc "${CHAT[ID]}" "$1" "$2"
}
checkback() {
	check_back "${CHAT[ID]}" "$1"
}
checkproc() {
	check_proc "${CHAT[ID]}" "$1"
}
killback() {
	kill_back  "${CHAT[ID]}" "$1"
}
killproc() {
	kill_proc "${CHAT[ID]}" "$1"
}

# internal functions
# $1 chatid
# $2 prefix
fifoname(){
	echo "$2${ME}_$1"
}

# $1 pipename
listproc() {
	# shellcheck disable=SC2009
	ps -ef | grep -v grep| grep "$1" | sed 's/\s\+/\t/g' | cut -f 2
}

# inline and backgound functions
# $1 chatid
# $2 program
# $3 jobname
start_back() {
	local fifo; fifo="${TMPDIR:-.}/$(fifoname "$1")"
	echo "$1:$3:$2" >"${fifo}$3-back.cmd"
	start_proc "$1" "$2" "back-$3-"
}


# $1 chatid
# $2 program
# $3 prefix
start_proc() {
	[ "$2" = "" ] && return
	kill_proc "$1" "$3"
	local fifo; fifo="${TMPDIR:-.}/$(fifoname "$1" "$3")"
	mkfifo "${fifo}"
	{ set -f
	  # shellcheck disable=SC2002
	  cat "${fifo}" | $2 | "${SCRIPT}" outproc "${1}" "${fifo}"
	} &>>"${fifo}.log" &
	disown -a
}


# $1 chatid
# $2 jobname
check_back() {
	check_proc "$1" "back-$2-"
}

# $1 chatid
# $2 prefix
check_proc() {
	[ "$(listproc "$(fifoname "$1" "$2")")" != "" ]
	# shellcheck disable=SC2034
	res=$?; return $?
}

# $1 chatid
# $2 jobname
kill_back() {
	kill_proc "$1" "back-$2-"
	rm -f "${TMPDIR:-.}/$(fifoname "$1")$2-back.cmd"
}


# $1 chatid
# $2 prefix
kill_proc() {
	local fifo; fifo="$(fifoname "$1" "$2")"
	kill -15 "$(listproc "${fifo}")" 2>/dev/null
	fifo="${TMPDIR:-.}/${fifo}"
	[ -s "${fifo}.log" ] || rm -f "${fifo}.log"
	[ -p "${fifo}" ] && rm -f "${fifo}";
}

# $1 chat
# $2 message
forward_interactive() {
	local fifo; fifo="${TMPDIR:-.}/$(fifoname "$1")"
	[ -p "${fifo}" ] && echo "$2" >"${fifo}"
}