A Flac to Mp3 Conversion Shell Script

I've had to do it enough times that I wrote a script yesterday to automate the conversions for me. There is a related one for converting aac files to mp3. Eventually I will just build one app that will convert any audio format to mp3.

#!/bin/bash 

numOfArgs=$#

DIR_NOT_FOUND=12
DIR_FOUND=0

FLAC_FILE_UNREADABLE=7
HELP_DISPLAY_VAL=5

NUM_OF_TAGS=6

#Audio File Metadata Tags
artist=""
track_num=""
song_title=""
genre=""
album=""
year=""

trash="/home/griot/.local/share/Trash/files"
log_file="flac_conversion.log"

declare -a tagList           # Store the tags in this array

#===  FUNCTION  ================================================================
#          NAME:  DisplayUsage
#   DESCRIPTION:  Prints help information and exits  
#    PARAMETERS:  
#       RETURNS:  HELP_DISPLAY_VAL
#===============================================================================
DisplayUsage() 
{
    echo -e
    echo -e "usage: $0 [directory]"
    echo -e "Options:"
    echo -e " -h or --help or displays options for $0"
    exit $HELP_DISPLAY_VAL
} 

# Statements dealing with calling the help function.
# If no args are given to fix_permisions then call DisplayUsage.
if [[ "$numOfArgs" -lt 1 ]]; then 
   DisplayUsage
fi

# If first arg is -h or --help call DisplayUsage.
if [[ "$1" == "-h" || "$1" == "--help" ]] ; then
    DisplayUsage
fi 

flacDirectory="$1"

#===  FUNCTION  ================================================================
#          NAME:  FillsTagList
#   DESCRIPTION:  Fills the taglist array with a flac file's metadata
#    PARAMETERS:  Gets passed a flac file
#       RETURNS:  Should return an error if there is problem (not done yet)
#===============================================================================
FillsTagList ()
{
    local ftc_flacFile="$1"
    local count=0

    # Create a tmp file where the flac metadata is stored.
    touch flac_tags.tmp
    metaflac --export-tags-to=- "$ftc_flacFile" > flac_tags.tmp

    BACKIFS=$IFS
    IFS=$'\n'

    exec 0<flac_tags.tmp
    
    for line in $(cat flac_tags.tmp) ; do 
        tagList[$count]=${line##*=}
        ((count++))
    done

    # Now that we are done delete the tmp file.
    rm flac_tags.tmp
    unset count
}    # ----------  end of function FillsTagList  ----------


#===  FUNCTION  ================================================================
#          NAME:  GetSongMetadata
#   DESCRIPTION:  The data that we got from FillsTag is put into the tag
#                 variables.
#    PARAMETERS:  Uses global variables
#       RETURNS:  Later on will make it throw an error code if there are
#                 problems.
#===============================================================================
GetSongMetadata ()
{
    local fileName="$1"
    FillsTagList "$fileName"

    artist=${tagList[0]}
    song_title=${tagList[1]}
    album=${tagList[2]}
    year=${tagList[3]}
    track_num=${tagList[4]}
    genre=${tagList[5]}
    
}    # ----------  end of function GetSongMetaData  ----------


#===  FUNCTION  ================================================================
#          NAME:  ConvertsToMp3
#   DESCRIPTION:  Sends a flac file to functions that get its metadata.
#                 When the metadata is acquired then convert the flac to an
#                 mp3 using a bitrate of 256.  
#    PARAMETERS:  a flac file.
#       RETURNS:  FLAC_FILE_UNREADABLE 
#===============================================================================
ConvertsToMp3 ()
{
    local flacFile="$1"

    # We only want to convert files that are not copyprotected (DRM free).
    if  [ ! -r "$flacFile" ] ; then
        echo -en "$flacFile is unreadable.  ConvertsToMp3 error code "
        echo -e "$FLAC_FILE_UNREADABLE, (copyprotected flac file)."
        return $FLAC_FILE_UNREADABLE
    else
        # Next call GetSongMetadata to fill the IDv3 tags.
        GetSongMetadata "$flacFile" 
        
        flac -dc "$flacFile" | lame -b 192 -h --ta "$artist" --tn "$track_num"\
            --tt "$song_title" --tl "$album" --tg "$genre" --ty "$year" \
            --add-id3v2 - "${flacFile%*.flac}.mp3" &>>$log_file
    fi

    mv "$flacFile" "$trash"

}    # ----------  end of function ConvertsToMp3  ----------


#===  FUNCTION  ================================================================
#          NAME:  VerifyDirectory
#   DESCRIPTION:  Tests if the directory given as arg to script exists.
#    PARAMETERS:  $1 (directory to search for text files.)
#       RETURNS:  either DIR_FOUND or DIR_NOT_FOUND
#===============================================================================
VerifyDirectory ()
{
    local targetDir="$1"
    echo -e "$targetDir in VerifyDirectory"

    if [ -e "$targetDir" ] ; then
        return $DIR_FOUND
    else
        echo -e "$targetDir not found sending $DIR_NOT_FOUND back"
        return $DIR_NOT_FOUND
    fi
}    # ----------  end of function VerifyDirectory  ----------


VerifyDirectory "$flacDirectory"
dirTestResut=$?
#echo "$dirTestResut was the result of calling VerifyDirectory"

if [[ "$dirTestResut" -eq "$DIR_NOT_FOUND" ]] ; then
    echo -e "Cannot find $flacDirectory"
    exit $DIR_NOT_FOUND
else
   cd "$flacDirectory"

   for file in ./* ; do
       
       if [[ ${file##*.} = "flac" ]] ; then
           ConvertsToMp3 "$file"
       fi

   done
fi

Also I am finding out that the bashsupport plugin for vim is very cool.