#!/usr/bin/env zsh
# apply replay gain tags to files in ${1}

setopt LOCAL_OPTIONS ERR_RETURN NO_UNSET PIPE_FAIL
setopt CSHNULLGLOB # remove non-matching globs but cancel if nothing matches

local dir=${1}

rsgain custom \
    --album \
    --tagmode=i \
    --loudness=-18 \
    --clip-mode=p \
    --id3v2-version=keep \
    --opus-mode=d \
    --preserve-mtimes \
    ${dir}/*.{flac,mp3,m4a,opus,ogg,oga,wma,wav,wv,aiff,ape}