gettags.sh

#!/bin/bash

# This is just a test script to show off the 'gettags' function, which
# reads the tags of FLAC files.

if=$(readlink -f "$1")

declare -A alltags

gettags () {
    for field in "${!alltags[@]}"; do
        unset -v alltags[${field}]
    done

    mapfile -t lines < <(metaflac --no-utf8-convert --export-tags-to=- "$if")

    for (( z=0; z<${#lines[@]}; z++ )); do
        line="${lines[${z}]}"

        unset -v mflac

        mflac[0]="${line%%=*}"
        mflac[1]="${line#*=}"

        if [[ -z ${mflac[1]} ]]; then
            continue
        fi

        field="${mflac[0],,}"

        if [[ -n ${alltags[${field}]} ]]; then
            continue
        fi

        alltags["${field}"]="${mflac[1]}"
    done
}

gettags

for field in "${!alltags[@]}"; do
    printf '%s\n' "${field}: ${alltags[${field}]}"
done | sort