added apod download script

* largely based on https://gist.github.com/mtking2/c38948f731d9017fee4edb36667c2a70

bin/apod

@@ -0,0 +1,83 @@
+#!/bin/bash
+# apod.sh largely based on
+# https://gist.github.com/mtking2/c38948f731d9017fee4edb36667c2a70
+
+http_proxy=""
+
+green="\033[32m"
+white="\033[0m"
+blue="\033[34m"
+
+path="$HOME/.cache/apod"
+
+mkdir -p $path
+rm -f $path/*.html
+echo -e "$(date "+%Y-%m-%d %H:%M:%S") get apod started ${green}✓${white}"
+wget -q https://apod.nasa.gov/apod/ap$(date +%y%m%d).html --content-on-error -P $path
+index=$(find $path -type f -name "*.html")
+echo -e "${blue}try \"\$(grep -i \"IMG SRC=\" $index | cut -d\\\" -f2)\":${white} $(grep -i "IMG SRC=" $index || echo "is null")"
+echo -e "${blue}try \"\$(grep -i \"a href=\"image\" $index | cut -d\\\" -f2)\":${white} $(grep -i "a href=\"image" $index || echo "is null")"
+
+get_img() {
+    img="$(grep -i "a href=\"image" $index | cut -d\" -f2 | head -1 | xargs)"
+    if [[ -z "$img" ]]; then
+        img="$(grep -i "IMG SRC=" $index | cut -d\" -f2 | head -1 | xargs)"
+    fi
+}
+get_img
+
+# sometimes the APOD is an iframe containing a video/flash/js element
+# this condition should detect the absence of an image and use the previous APOD
+if [[ -z "$img" ]]; then
+  yesterday="https://apod.nasa.gov/apod/ap$(date --date yesterday +%y%m%d).html"
+  echo -e "${blue}Using yesterday's image:${white} $yesterday"
+  wget -q $yesterday -O $index
+  get_img
+fi
+
+img_name="$(echo "$img" | grep image | head -1 | cut -d\/ -f3)"
+
+# deal with external images
+if [[ $img =~ ^https?://.*$ ]]; then
+  url=$img
+else
+  url="https://apod.nasa.gov/apod/$img"
+fi
+
+apod_title=$(grep "APOD:" $index | sed 's/<\/\?[^>]\+>//g' | sed 's/ APOD: //' | head -1)
+if [[ "$apod_title" =~ ^Astronomy.*$ ]]; then
+    apod_title=$(echo $img_name | sed 's/....$//' )
+fi
+apod_date=$(grep "^$(date +%Y\ %B)" $index | xargs | head -1 | sed 's/ /-/g')
+
+echo -e "${blue}path:${white} $path"
+echo -e "${blue}apod_title:${white} $apod_title"
+echo -e "${blue}img:${white} $img"
+echo -e "${blue}img_name:${white} "$img_name""
+echo -e "${blue}url:${white} $url"
+echo -e "${blue}apod_date:${white} $apod_date"
+
+filename=$(echo $apod_title | xargs | sed 's/- //g' | sed "s/ /-/g").jpg
+
+wget -q $url  -O "$path/$filename"
+
+# GNOME
+# possible values for gsettings: "wallpaper", "centered", "scaled", "stretched", "zoom", "spanned"
+# gsettings set org.gnome.desktop.background picture-uri "File://$path/wallpaper.jpg"
+# gsettings set org.gnome.desktop.background picture-options zoom
+
+# Cinnamon
+ #gsettings set org.cinnamon.desktop.background picture-uri "file://$path/$apod_date-$short_title-$img_name"
+ # gsettings set org.cinnamon.desktop.background picture-uri "file://$path/$filename"
+ # gsettings set org.cinnamon.desktop.background picture-options scaled
+
+# Xfce
+# xfconf-query --channel xfce4-desktop --property /backdrop/screen0/monitor0/image-path --set $path/wallpaper.jpg
+
+# feh
+# feh --bg-scale $path/wallpaper.jpg
+
+xdg-open "$path/$filename" 2>&1 >/dev/null &
+rm -f $index
+echo -e "$(date "+%Y-%m-%d %H:%M:%S") done ${green}✓${white}" && \
+notify-send -u critical -i ~/.icons/Flat-Remix-Blue-Dark/apps/scalable/weather-widget.svg "apod just changed ✓" "...to $apod_title"