#!/bin/bash
#
#	Variables
#
	scripts_remains=( "${@}" )
	scripts_total=${#scripts_remains[@]}
	TMP_DIR=$HOME/.cache/$$
	
	# Filled in the process
	unset scripts_todo[@] scripts_id[@]
	unset done_scripts[@] done_ret[@]
	
	# Defaults
	LIMIT=5
	WAIT=5
	
	# Counters - Fixed
	counter_done=0
	
	# Counters - Dynamic
	counter_start=0
	counter_running=0
#
#	Environment check
#
	[[ -d "$TMP_DIR" ]] || mkdir -p "$TMP_DIR"
#
#	Display & Action --> limit 5, passing 4
#
	while [[ $counter_done -lt $scripts_total ]]
	do	# Loop the menu & Reset some values
		
		# Step 1
		# Check if there are files to be started
		echo "Scripts @ start"
# The Limit check is worthless, even when set to 2, all passed scripts gets executed on first loop...
		if [[ $counter_running -lt $LIMIT ]]
		then	# So we look in the script_remains for tasks
			num=0
			for S in ${scripts_remains[@]};do
				[[ -z "$S" ]] && break
				# Generate the command & save to new array
				[[ [./] = "${S:0:1}" ]] && PRE="" || PRE="./" 
				cmd="$PRE$S ; echo \$? > $TMP_DIR/$S.tmp"
				echo "Starting: $S"
				(eval $cmd) &
				scripts_id[$counter_start]="$!"
				scripts_todo[$counter_start]="$S"
				unset scripts_remains[$num]
				((counter_start++))
				((counter_running++))
				((num++))
			done
		fi
		
		# Step 2
		# Print status of already done scripts
		echo "Scrips @ done"
		C=0
		for D in "${done_scripts[@]}";do
			R=${done_id[$C]}
			echo "$D ended $R"
			((C++))
		done
		
		# Step 3
		# Show current tasks running -- now loops here endlessly...  because a script gets lost within the loop
		num=0
		echo "Scripts @ work"
		for W in "${scripts_todo[@]}";do
			# Only display if array element is not empty
			if [[ ! -z "$W" ]]
			then	val=${scripts_id[$num]}
				if [[ ! -z "$val" ]]
				then	if ps -ha | grep $val|grep -v -q grep
					then	echo "$W works : $val"
					else	echo "$W has ended..."
						# Unset this item now
						done_scripts[$counter_done]="$W"
						read R < $TMP_DIR/$W.tmp
						done_id[$counter_done]="$R"
						unset scripts_todo[$num] scripts_id[$num]
						((counter_done++))
						((counter_running--))
					fi
				fi
				((num++))
			fi
			
		done
		
		[[ $counter_done -lt $scripts_total ]] && \
			echo "wait for update: $WAIT" && \
			sleep $WAIT && \
			clear
	done
#
#	Clean up temp files
#
	rm -fr "$TMP_DIR"

grep -n sleep *
script1:2:sleep 30 
script2:2:sleep 9
script3:2:sleep 20
script4:2:sleep 15