Related article: https://coderwall.com/p/n7kpqa

treehouse.sh

#!/usr/bin/env sh

# If DEBUG environment variable is not defined set as false
if [[ "x${DEBUG}" == "x" ]]
then
  DEBUG=false
fi

# Logger function. Display a message if DEBUG is true
logMessage() {
  if [[ $DEBUG == "true" ]]
  then
    echo $1
  fi
}

# Configuration
FEED_URL="http://teamtreehouse.com/library/the-treehouse-show.rss?feed_token=********-****-****-****-***********"
DRIVE_MOUNT_POINT="/Volumes/Samsung"
TARGET_DIRECTORY="${DRIVE_MOUNT_POINT}/Plex/Series/Treehouse"

# Applications
CURL=`which curl`

# Check required applications
if [[ -z $CURL ]]
then
  logMessage "cURL command line tool is not installed."
  exit -1
fi

# Check external drive
# Remove this section if you do not need to check the mount point
if [[ -n `mount | grep "${DRIVE_MOUNT_POINT}"` ]]
then
  logMessage "External drive is mounted."
else
  logMessage "External drive is not mounted."
  exit -1
fi

# If the target directory does not exist
if [[ ! -d $TARGET_DIRECTORY ]]
then
  logMessage "Target directory does not exist. (${TARGET_DIRECTORY})"
  logMessage "Create ${TARGET_DIRECTORY}"
  # Create
  mkdir -p $TARGET_DIRECTORY
fi

# Download the feed
logMessage "Download Feed..."
target_name=`basename $0`
curl -o /tmp/${target_name}.feed -s $FEED_URL
logMessage "Feed downloaded."

# Build an array of urls
logMessage "Parse video URIs."
videos=`grep -e "enclosure" /tmp/${target_name}.feed | grep -o 'http://[^"]\+' | sed -e 's/\.mp4.*/?hd=yes/g'`

for uri in $videos
do
  # Fetch the direct link
  target=`$CURL -s "${uri}" | grep -o 'http://[^"]\+'`
  # Get the filename of the video
  filename=`basename "$target" | sed -e "s/\?.*//"`

  # If current video file exists then I got this episode
  # and possible all others after that (feed order: publishedAt desc)
  if [[ -f $TARGET_DIRECTORY"/"$filename ]]
  then
    logMessage "Done."
    exit -1
  fi

  # Download the video to the target directory
  logMessage "Download ${filename}..."
  $CURL -s -o $TARGET_DIRECTORY"/"$filename "${target}"
  logMessage "Downloaded."
done