Read a config file into 2D array - bash

Question

I have a config file:
map_a 1234,3788,9940
map_b 9948,8901
map_c
map_d 7789,30400
map_e 499423
map_f
The array variable should content:
Name Attribute 1 Attribute 2 Attribute 3 Attribute ...
---------------------------------------------------------------------------
map_a 1234 3788 9940
map_b 9948 8901
map_c
map_d 7789 30400
map_e 499423
map_f
...
So:
foo[0,0] = map_a
foo[0,1] = 1234
foo[3,2] = 30400
...
How can I achieve this with bash? Or are there recommendations for change the delimiters of the .cfg file? As it's flexible from scratch
Regards
Joe C.

Answer 1

Bash arrays are one-dimensional, but associate arrays may allow you to represent something that looks like 2D array (each key will be the indices combined with ','). Without changing the structure:
#! /bin/bash
declare -A foo
n=0
maxcol=0
IFS=" ,"
while read k v ; do
foo[$n,0]=$k
IFS=', ' read -r -a vv <<< "$v"
i=1
for v1 in ${vv[*]} ; do
foo[$n,$i]=$v1
[ $i -gt $maxcol ] && maxcol=$i
let i=i+1
done
let n=n+1
done < config.txt
for ((i=0; i<n ; i++)) do
for ((j=0 ; j<maxcol ; j++)) do
echo "foo($i,$j)=${foo[$i,$j]}"
done
echo
done

Answer 2

Alternative will be to use the attribute name as the first key, so that it will be possible to query ${foo[map_a,2}} - 2nd attribute of map_a
#! /bin/bash
declare -A foo
n=0
maxcol=0
maxcol=0
IFS=" ,"
while read k v ; do
foo[$n,0]=$k
IFS=', ' read -r -a vv <<< "$v"
i=1
for v1 in ${vv[*]} ; do
# Use key as first index
foo[$k,$i]=$v1
[ $i -gt $maxcol ] && maxcol=$i
let i=i+1
done
let n=n+1
done < config.txt
for i in map_a map_b map_c map_d map_e map_f ; do
for ((j=0 ; j<maxcol ; j++)) do
echo "foo($i,$j)=${foo[$i,$j]}"
done
echo
done

Answer 3

Alright, I've also put maxcol into an array:
declare -A foo
declare -A maxcol
n=0
IFS=" ,"
while read k v
do
foo[$n,0]=$k
IFS=', ' read -r -a vv <<< "$v"
i=1
for v1 in ${vv[*]}
do
foo[$n,$i]=$v1
let i=i+1
done
maxcol[$n]=$i
let n=n+1
done < config.txt
for (( i=0; i<n; i++ ))
do
for (( j=0 ; j<maxcol[$i] ; j++ ))
do
echo "foo($i,$j)=${foo[$i,$j]}"
done
echo "maxcol($i)=${maxcol[$i]}"
echo
done
I think this will fit my needs now perfectly.