groove-box-utils.sh

#!/bin/bash
########################################################################################
# Requires:
#    shuf - install on a mac with `brew install coreutils`
# Args:
#    -d | --source-dir   source dir to copy wav files from
#    -f | --find         find a word ignoring case ie. kick
#    -s | --samples      number of samples to copy to a new random dir
#    -r | --repeat       number of times to create a random sample dir
#    -x | --max-size     maximum file size ie. 2MB
#    --sfz               create an sfz file from the random sample dir
#
# Examples:
# groove-box-utils.sh #copies 8 random samples to a new dir
# groove-box-utils.sh -s 32 -x 1MB
# open "$(groove-box-utils.sh -s 32 -x 1MB -f glass)"
# 
# NOTE: shuf is from gnu utils
# NOTE: this bash script was created on mac os
########################################################################################

SRC_DIR='.'
MAX_SIZE='10M'
FIND_WORD='.'
SAMPLE_COUNT=8
REPEAT_COUNT=1
MAKE_SFZ=0

while [[ $# -gt 0 ]]; do
  case $1 in
    -d|--source-dir)
      SRC_DIR="$2"; shift; shift
      ;;
    -f|--find)
      FIND_WORD="$2"; shift; shift
      ;;
    -s|--samples)
      SAMPLE_COUNT="$2"; shift; shift
      ;;
    -r|--repeat)
      REPEAT_COUNT="$2"; shift; shift
      ;;
    -x|--max-size)
      MAX_SIZE="$2"; shift; shift
      ;;
    --sfz)
      MAKE_SFZ=1; shift
      ;;
    -*|--*)
      echo "Unknown option $1"; exit 1
      ;;
  esac
done

pushd "$SRC_DIR" > /dev/null
    for (( i=1; i<=$REPEAT_COUNT; i++ ))
    do
        RND=$RANDOM
        RD="$(pwd)/random_samples_$RND"
        mkdir "$RD"
        find . -type f -name "*.[wW][aA][vV]" -size -$MAX_SIZE | grep -i "$FIND_WORD" | shuf -n $SAMPLE_COUNT | tr "\n" "\0" | xargs -0 -I % cp % "$RD"
        if [ $MAKE_SFZ -eq 1 ]; then
            MIDI_KEY=36
            SAVEIFS=$IFS
            IFS=$(echo -en "\n\b")
            for f in "$RD"/*
            do
                echo "<region> key=$MIDI_KEY sample=$(basename $f)" >> "$RD/$RD.sfz"
                let MIDI_KEY++
            done
            IFS=$SAVEIFS
        fi
    done
    echo "$RD"
popd > /dev/null