Parse YAML in BASH with support of plain arrays and arrays of hashes

parse_yml.bash

#!/usr/bin/env bash

parse_yml() {
    [ -n "$2" ] && local prefix="$2" || {
        local prefix=$(basename "$1"); prefix=${prefix%%.*}
    }
    local file="$1"
    local s='[[:space:]]*'
    local w='[a-zA-Z0-9_]*'
    local fs="$(echo @|tr @ '\034')"

    sed -ne "s|^\($s\)\($w\)$s[:-]$s[\"']\(.*\)[\"']$s\$|\1$fs\2$fs\3|p" \
        -e "s|^\($s\)\($w\)$s[:-]$s[\"']*\(.*\)[\"']*$s\$|\1$fs\2$fs\3|p" "$file" |
    awk -F"$fs" '{
        if (!step && length($1)) {
            step = length($1);
        }

        indent   = step > 0 ? length($1)/step : 0;
        key      = $2;
        value    = $3;

        keys[indent] = key;
        for (i in keys) {
            if (i > indent) {
                delete keys[i];
            }
        }

        if (length(value) > 0) {
            var = "'"$prefix"'";
            is_array = 0;
            for (i = 0; i <= indent; i++) {
                if (length(keys[i]) == 0) {
                    is_array = 1;
                } else {
                    var=(var)("_")(keys[i]);
                }
            }

            if (is_array == 1) {
                printf("%s+=(\"%s\")\n", var, value);
            } else {
                printf("%s=\"%s\"\n", var, value);
            }
        }
    }'
}