#!/usr/bin/env bash
# -*- mode: sh; tab-width: 8; coding: utf-8-unix -*-
# shellcheck disable=SC1003

prog=$( basename $0 .bash )
ROLE=base

# github.com/jasperes/bash-yaml/script/yaml.sh

# Based on https://gist.github.com/pkuczynski/8665367

parse_yaml() {
    local yaml_file=$1
    local prefix=$2
    local s
    local w
    local fs

    s='[[:space:]]*'
    w='[a-zA-Z0-9_.-]*'
    fs="$(echo @|tr @ '\034')"

    (
        sed -e '/- [^\“]'"[^\']"'.*: /s|\([ ]*\)- \([[:space:]]*\)|\1-\'$'\n''  \1\2|g' |

        sed -ne '/^--/s|--||g; s|\"|\\\"|g; s/[[:space:]]*$//g;' \
            -e "/#.*[\"\']/!s| #.*||g; /^#/s|#.*||g;" \
            -e "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" |

        awk -F"$fs" '{
            indent = length($1)/2;
            if (length($2) == 0) { conj[indent]="+";} else {conj[indent]="";}
            vname[indent] = $2;
            for (i in vname) {if (i > indent) {delete vname[i]}}
                if (length($3) > 0) {
                    vn=""; for (i=0; i<indent; i++) {vn=(vn)(vname[i])("_")}
                    printf("%s%s%s%s=(\"%s\")\n", "'"$prefix"'",vn, $2, conj[indent-1],$3);
                }
            }' |

        sed -e 's/_=/+=/g' |

        awk 'BEGIN {
                FS="=";
                OFS="="
            }
            /(-|\.).*=/ {
                gsub("-|\\.", "_", $1)
            }
            { print }'
    ) < "$yaml_file"
}

create_variables() {
    local yaml_file="$1"
    local prefix="$2"
    eval $(parse_yaml "$yaml_file" "$prefix")
}

if [ -x /usr/bin/basename ] && [ $( basename -- $0 ) = 'yaml_to_bash3.bash' -o $( basename -- $0 ) = 'parse_yaml3.sh' ] ; then
    [ "$#" -eq 0 ] && echo "USAGE: $0 yamlfile [ prefix ]" && exit 1
    file=$1
    shift
    [ "$#" -gt 1 ] &&  prefix=$1 || prefix=""
    echo "DEBUG: $file $prefix"
    create_variables $file $prefix
  fi