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+#!/usr/bin/env zsh
+
+#
+# zsh-async
+#
+# version: 1.1.0
+# author: Mathias Fredriksson
+# url: https://github.com/mafredri/zsh-async
+#
+
+# Wrapper for jobs executed by the async worker, gives output in parseable format with execution time
+_async_job() {
+	# Store start time as double precision (+E disables scientific notation)
+	float -F duration=$EPOCHREALTIME
+
+	# Run the command
+	#
+	# What is happening here is that we are assigning stdout, stderr and ret to
+	# variables, and then we are printing out the variable assignment through
+	# typeset -p. This way when we run eval we get something along the lines of:
+	# 	eval "
+	# 		typeset stdout=' M async.test.sh\n M async.zsh'
+	# 		typeset ret=0
+	# 		typeset stderr=''
+	# 	"
+	unset stdout stderr ret
+	eval "$(
+		{
+			stdout=$(eval "$@")
+			ret=$?
+			typeset -p stdout ret
+		} 2> >(stderr=$(cat); typeset -p stderr)
+	)"
+
+	# Calculate duration
+	duration=$(( EPOCHREALTIME - duration ))
+
+	# stip all null-characters from stdout and stderr
+	stdout=${stdout//$'\0'/}
+	stderr=${stderr//$'\0'/}
+
+	# if ret is missing for some unknown reason, set it to -1 to indicate we
+	# have run into a bug
+	ret=${ret:--1}
+
+	# Grab mutex lock
+	read -ep >/dev/null
+
+	# return output (<job_name> <return_code> <stdout> <duration> <stderr>)
+	print -r -N -n -- "$1" "$ret" "$stdout" "$duration" "$stderr"$'\0'
+
+	# Unlock mutex
+	print -p "t"
+}
+
+# The background worker manages all tasks and runs them without interfering with other processes
+_async_worker() {
+	local -A storage
+	local unique=0
+
+	# Process option parameters passed to worker
+	while getopts "np:u" opt; do
+		case $opt in
+			# Use SIGWINCH since many others seem to cause zsh to freeze, e.g. ALRM, INFO, etc.
+			n) trap 'kill -WINCH $ASYNC_WORKER_PARENT_PID' CHLD;;
+			p) ASYNC_WORKER_PARENT_PID=$OPTARG;;
+			u) unique=1;;
+		esac
+	done
+
+	# Create a mutex for writing to the terminal through coproc
+	coproc cat
+	# Insert token into coproc
+	print -p "t"
+
+	while read -r cmd; do
+		# Separate on spaces into an array
+		cmd=(${=cmd})
+		local job=$cmd[1]
+
+		# Check for non-job commands sent to worker
+		case $job in
+			_unset_trap)
+				trap - CHLD; continue;;
+			_killjobs)
+				# Do nothing in the worker when receiving the TERM signal
+				trap '' TERM
+				# Send TERM to the entire process group (PID and all children)
+				kill -TERM -$$ &>/dev/null
+				# Reset trap
+				trap - TERM
+				continue
+				;;
+		esac
+
+		# If worker should perform unique jobs
+		if (( unique )); then
+			# Check if a previous job is still running, if yes, let it finnish
+			for pid in ${${(v)jobstates##*:*:}%\=*}; do
+				if [[ ${storage[$job]} == $pid ]]; then
+					continue 2
+				fi
+			done
+		fi
+
+		# Run task in background
+		_async_job $cmd &
+		# Store pid because zsh job manager is extremely unflexible (show jobname as non-unique '$job')...
+		storage[$job]=$!
+	done
+}
+
+#
+#  Get results from finnished jobs and pass it to the to callback function. This is the only way to reliably return the
+#  job name, return code, output and execution time and with minimal effort.
+#
+# usage:
+# 	async_process_results <worker_name> <callback_function>
+#
+# callback_function is called with the following parameters:
+# 	$1 = job name, e.g. the function passed to async_job
+# 	$2 = return code
+# 	$3 = resulting stdout from execution
+# 	$4 = execution time, floating point e.g. 2.05 seconds
+# 	$5 = resulting stderr from execution
+#
+async_process_results() {
+	setopt localoptions noshwordsplit
+
+	integer count=0
+	local worker=$1
+	local callback=$2
+	local -a items
+	local IFS=$'\0'
+
+	typeset -gA ASYNC_PROCESS_BUFFER
+	# Read output from zpty and parse it if available
+	while zpty -rt $worker line 2>/dev/null; do
+		# Remove unwanted \r from output
+		ASYNC_PROCESS_BUFFER[$worker]+=${line//$'\r'$'\n'/$'\n'}
+		# Split buffer on null characters, preserve empty elements
+		items=("${(@)=ASYNC_PROCESS_BUFFER[$worker]}")
+		# Remove last element since it's due to the return string separator structure
+		items=("${(@)items[1,${#items}-1]}")
+
+		# Continue until we receive all information
+		(( ${#items} % 5 )) && continue
+
+		# Work through all results
+		while (( ${#items} > 0 )); do
+			$callback "${(@)=items[1,5]}"
+			shift 5 items
+			count+=1
+		done
+
+		# Empty the buffer
+		unset "ASYNC_PROCESS_BUFFER[$worker]"
+	done
+
+	# If we processed any results, return success
+	(( count )) && return 0
+
+	# No results were processed
+	return 1
+}
+
+# Watch worker for output
+_async_zle_watcher() {
+	setopt localoptions noshwordsplit
+	typeset -gA ASYNC_PTYS ASYNC_CALLBACKS
+	local worker=$ASYNC_PTYS[$1]
+	local callback=$ASYNC_CALLBACKS[$worker]
+
+	if [[ -n $callback ]]; then
+		async_process_results $worker $callback
+	fi
+}
+
+#
+# Start a new asynchronous job on specified worker, assumes the worker is running.
+#
+# usage:
+# 	async_job <worker_name> <my_function> [<function_params>]
+#
+async_job() {
+	setopt localoptions noshwordsplit
+
+	local worker=$1; shift
+	zpty -w $worker $@
+}
+
+# This function traps notification signals and calls all registered callbacks
+_async_notify_trap() {
+	setopt localoptions noshwordsplit
+
+	for k in ${(k)ASYNC_CALLBACKS}; do
+		async_process_results $k ${ASYNC_CALLBACKS[$k]}
+	done
+}
+
+#
+# Register a callback for completed jobs. As soon as a job is finnished, async_process_results will be called with the
+# specified callback function. This requires that a worker is initialized with the -n (notify) option.
+#
+# usage:
+# 	async_register_callback <worker_name> <callback_function>
+#
+async_register_callback() {
+	setopt localoptions noshwordsplit nolocaltraps
+
+	typeset -gA ASYNC_CALLBACKS
+	local worker=$1; shift
+
+	ASYNC_CALLBACKS[$worker]="$*"
+
+	if (( ! ASYNC_USE_ZLE_HANDLER )); then
+		trap '_async_notify_trap' WINCH
+	fi
+}
+
+#
+# Unregister the callback for a specific worker.
+#
+# usage:
+# 	async_unregister_callback <worker_name>
+#
+async_unregister_callback() {
+	typeset -gA ASYNC_CALLBACKS
+
+	unset "ASYNC_CALLBACKS[$1]"
+}
+
+#
+# Flush all current jobs running on a worker. This will terminate any and all running processes under the worker, use
+# with caution.
+#
+# usage:
+# 	async_flush_jobs <worker_name>
+#
+async_flush_jobs() {
+	setopt localoptions noshwordsplit
+
+	local worker=$1; shift
+
+	# Check if the worker exists
+	zpty -t $worker &>/dev/null || return 1
+
+	# Send kill command to worker
+	zpty -w $worker "_killjobs"
+
+	# Clear all output buffers
+	while zpty -r $worker line; do true; done
+
+	# Clear any partial buffers
+	typeset -gA ASYNC_PROCESS_BUFFER
+	unset "ASYNC_PROCESS_BUFFER[$worker]"
+}
+
+#
+# Start a new async worker with optional parameters, a worker can be told to only run unique tasks and to notify a
+# process when tasks are complete.
+#
+# usage:
+# 	async_start_worker <worker_name> [-u] [-n] [-p <pid>]
+#
+# opts:
+# 	-u unique (only unique job names can run)
+# 	-n notify through SIGWINCH signal
+# 	-p pid to notify (defaults to current pid)
+#
+async_start_worker() {
+	setopt localoptions noshwordsplit
+
+	local worker=$1; shift
+	zpty -t $worker &>/dev/null && return
+
+	typeset -gA ASYNC_PTYS
+	typeset -h REPLY
+	zpty -b $worker _async_worker -p $$ $@ || {
+		async_stop_worker $worker
+		return 1
+	}
+
+	if (( ASYNC_USE_ZLE_HANDLER )); then
+		ASYNC_PTYS[$REPLY]=$worker
+		zle -F $REPLY _async_zle_watcher
+
+		# If worker was called with -n, disable trap in favor of zle handler
+		async_job $worker _unset_trap
+	fi
+}
+
+#
+# Stop one or multiple workers that are running, all unfetched and incomplete work will be lost.
+#
+# usage:
+# 	async_stop_worker <worker_name_1> [<worker_name_2>]
+#
+async_stop_worker() {
+	setopt localoptions noshwordsplit
+
+	local ret=0
+	for worker in $@; do
+		# Find and unregister the zle handler for the worker
+		for k v in ${(@kv)ASYNC_PTYS}; do
+			if [[ $v == $worker ]]; then
+				zle -F $k
+				unset "ASYNC_PTYS[$k]"
+			fi
+		done
+		async_unregister_callback $worker
+		zpty -d $worker 2>/dev/null || ret=$?
+	done
+
+	return $ret
+}
+
+#
+# Initialize the required modules for zsh-async. To be called before using the zsh-async library.
+#
+# usage:
+# 	async_init
+#
+async_init() {
+	(( ASYNC_INIT_DONE )) && return
+	ASYNC_INIT_DONE=1
+
+	zmodload zsh/zpty
+	zmodload zsh/datetime
+
+	# Check if zsh/zpty returns a file descriptor or not, shell must also be interactive
+	ASYNC_USE_ZLE_HANDLER=0
+	[[ -o interactive ]] && {
+		typeset -h REPLY
+		zpty _async_test cat
+		(( REPLY )) && ASYNC_USE_ZLE_HANDLER=1
+		zpty -d _async_test
+	}
+}
+
+async() {
+	async_init
+}
+
+async "$@"