convert empty line separated key value pair files to table

fields.bash

#!/usr/bin/env bash

flagh=0

case $1 in
-h)	flagh=1
	shift
	;;
-*)	echo usage: $(basename $0) [-h] [file ...] >&2
	exit 1
	;;
esac

awk -v "flagh=$flagh" '
BEGIN {
	n = 1
	wid = 10
}
NF == 0 {
	n++
	next
}
NF != 2 {
	printf "warning: too many fields near %s\n", $0 >>"/dev/stderr"
	next
}
{	if(!($1 in keys)){
		keys[$1] = 1
		keyseq[++nkeys] = $1
		tab[0,$1] = $1
		if(flagh && length($1) > wid)
			wid = length($1)
	}
	if(length($2) > wid)
		wid = length($2)
	tab[n,$1] = $2
}
END {
	bp = 1
	if(flagh)
		bp = 0
	for(i = bp; i <= n; i++){
		for(j = 1; j <= nkeys; j++){
			if(j > 1)
				printf " "
			if((i,keyseq[j]) in tab)
				printf "%-*s", wid, tab[i,keyseq[j]]
			else
				printf "%-*s", wid, "-"
		}
		printf "\n"
	}
}
' "$@"