Cfrtjryk

i have a script (that Nuno wrote) to wget an image from one particular site and set my wallpaper. however i can't seem to modify it to be able to wget an image from this site: chromecast

images in the source have a url like this: image

i can't seem to isolate the url using grep since it is greedy. i realize grep -P can work, and it does if i enter it manually in the terminal. but in the script, when assigning a variable, it doesn't work. the variable can be set with grep but not grep -P.

#!/bin/bash

# * Name: earthwall.sh

# * Description: Downloads random image from earthview.withgoogle.com and sets as wallpaper on OSX

# * Author: Nuno Serro

# * Date: 09/07/2015 22:24:11 WEST

# * License: This program is free software: you can redistribute it and/or modify

#   it under the terms of the GNU General Public License as published by

#   the Free Software Foundation, either version 3 of the License, or

#   (at your option) any later version.

#   This program is distributed in the hope that it will be useful,

#   but WITHOUT ANY WARRANTY; without even the implied warranty of

#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

#   GNU General Public License for more details.

#   You should have received a copy of the GNU General Public License

#   along with this program.  If not, see      <http://www.gnu.org/licenses/>.

#

# * Copyright (c) 2015, Nuno Serro

#PID=$(pgrep gnome-session)

#PID=$(pgrep -f 'gnome-session' | head -n1)

#export DBUS_SESSION_BUS_ADDRESS=$(grep -z DBUS_SESSION_BUS_ADDRESS     /proc/$PID/environ)



mkdir -p ~/Pictures/globewall

cd ~/Pictures/globewall



# Get page index

wget -q https://clients3.google.com/cast/chromecast/home -O ~/Pictures/globewall/.index.html 2> /dev/null

if [ $? -ne 0 ]; then

echo "Failed to get index from google chromecast"

exit 1

fi



# Set image url, name and location

image_url=`cat ~/Pictures/globewall/.index.html | grep lh3.googleusercontent.com | grep -shoP 'https:[\][/][\][/]lh3(.*?)-mv' -m 1 -o | head -1 | sed 's/\//g' | sed 's/u003d/=/g'`

image_name= wallpaper.jpg



# Get image

wget -q $image_url -O ~/Pictures/globewall/$image_name 2> /dev/null

if [ $? -ne 0 ]; then

echo "Failed to get image from www.googleusercontent.com"

exit 1

fi



# Change wallpaper

sleep 1

/usr/bin/gsettings set org.gnome.desktop.background picture-options 'zoom'

/usr/bin/gsettings set org.gnome.desktop.background picture-uri "file://~/Pictures/globewall/$image_name"

/usr/bin/gsettings set org.gnome.desktop.screensaver picture-uri "file://~/Pictures/globewall/$image_name"



echo "Wallpaper changed to $image_name"

exit 0

i'm stuck.

Your script needs a bit of a makeover.

The two lines following the #Set image url, name and location line are broken for various reasons (e.g. incorrect grep syntax, incorrect assignment). In addition, your script doesn't double quote filenames which may break your script depending on the circumstances.

To make it work more reliably, I rewrote the core of your script as follows:

#!/bin/bash

fn_basedir=~/Pictures/globewall/

fn_index='.index.html'

fn_image='wallpaper.jpg'



mkdir -p "$fn_basedir"



# Get page index

wget -q "https://clients3.google.com/cast/chromecast/home" -O "${fn_basedir}${fn_index}" 

if [ $? -ne 0 ]; then

  echo "Failed to get index from google chromecast"

  exit 1

fi



# Set image url

image_url=$(grep -oP 'https:\/\/lh3(.*?)-mv' "${fn_basedir}${fn_index}" | sed -e 's/\//g' -e 's/u003d/=/g' | head -1)



# Get image

wget -q "$image_url" -O "${fn_basedir}${fn_image}" 

if [ $? -ne 0 ]; then

  echo "Failed to get image from www.googleusercontent.com"

  exit 1

fi



# Change wallpaper

sleep 1

/usr/bin/gsettings set org.gnome.desktop.background picture-options 'zoom'

/usr/bin/gsettings set org.gnome.desktop.background picture-uri "file://${fn_basedir}${fn_image}"

/usr/bin/gsettings set org.gnome.desktop.screensaver picture-uri "file://${fn_basedir}${fn_image}"



echo "Wallpaper changed to ${fn_image}"

exit 0

Awesome pictures btw!