weather.sh

#!/bin/sh

DOWNLOAD_DIR="$HOME/Downloads/weather"
REGION=txgulf

die() {
  ec=$1
  shift
  echo $@ >&2
  exit $ec
}

# make download dir if not available
if [ ! -d "$DOWNLOAD_DIR" ]; then
  mkdir -p "$DOWNLOAD_DIR" || die 1 "Unable to create $DOWNLOAD_DIR"
fi

# set loop counter
COUNTER=0

# remove old files
rm -rf "$DOWNLOAD_DIR"/*.gif
rm -rf "$DOWNLOAD_DIR"/*.txt
rm -rf "$DOWNLOAD_DIR"/*.png

# replace URL with your region
wget -O "$DOWNLOAD_DIR/map.gif" "http://archive.wfaa.com/weather/images/core/animated-loops/comp/880x495/${REGION}_anim.gif"

# expand gif and convert to png
convert -coalesce "$DOWNLOAD_DIR"/map.gif "$DOWNLOAD_DIR"/map.png || die 2 "Unable to find convert. Install imagemagick"

# display extracted images as ASCII
for i in "$DOWNLOAD_DIR"/map-*.png; do
  img2txt -W 75 -H 30 $i > $i.txt || die 3 "Unable to find img2txt. Install caca-utils"
done

clear
echo  # Compensate for cursor movement oddity
while [ $COUNTER -lt 5 ] ; do

  for i in "$DOWNLOAD_DIR"/map-*.txt; do
    cat $i
    lines=$(cat $i | wc -l)
    lines=$((lines+1))  # img2txt seems to lack trailing newline
    sleep 0.5
    echo -e "\033[${lines}A"
  done
  let COUNTER=COUNTER+1
done