Uses jq to parse json output from Bing.com

This commit makes the script compatible with current Bing.com as of 2020-12-21
and macOS 10.15. It includes the following changes:

- Use jq to parse json output from Bing.com
- Merge the latest and boost code paths
- Change wallpaper on macOS 10.15 with proper applescript
- Use https for all Bing.com requests if `-s/--ssl` is specified

Backward compatibility is _not_ tested with older macOS versions.

README.md

@@ -10,7 +10,7 @@ it to a directory.
 
 The script was tested on:
 
-- Mac OS X 10.8 - 10.12
+- Mac OS X 10.8 - 10.12, 10.15
 - Ubuntu 12.04 - 16.04
 
 How to use?
@@ -43,6 +43,9 @@ Options:
   -h --help                      Show this screen.
   --version                      Show version.
 ```
+Dependencies
+------------
+The script uses [jq](https://stedolan.github.io/jq/) to parse json output from Bing.com. Installation instructions can be found on [jq's download page](https://stedolan.github.io/jq/download/).
 
 Configuration on Mac
 --------------------

bing-wallpaper.sh

@@ -2,7 +2,7 @@
 # shellcheck disable=SC1117
 
 readonly SCRIPT=$(basename "$0")
-readonly VERSION='0.4.0'
+readonly VERSION='0.5.0'
 readonly RESOLUTIONS=(1920x1200 1920x1080 800x480 400x240)
 
 usage() {
@@ -46,6 +46,7 @@ transform_urls() {
 # Defaults
 PICTURE_DIR="$HOME/Pictures/bing-wallpapers/"
 RESOLUTION="1920x1080"
+BOOST="1"
 
 # Option parsing
 while [[ $# -gt 0 ]]; do
@@ -71,7 +72,7 @@ while [[ $# -gt 0 ]]; do
             SSL=true
             ;;
         -b|--boost)
-            BOOST=$(($2-1))
+            BOOST="$2"
             shift
             ;;
         -q|--quiet)
@@ -97,6 +98,13 @@ while [[ $# -gt 0 ]]; do
     shift
 done
 
+# Test for existence of the command jq
+if ! command -v jq &> /dev/null
+then
+    echo "The command jq could not be found. Refer to the readme for how to install jq."
+    exit
+fi
+
 # Set options
 [ -n "$QUIET" ] && CURL_QUIET='-s'
 [ -n "$SSL" ]   && PROTO='https'   || PROTO='http'
@@ -105,35 +113,28 @@ done
 mkdir -p "${PICTURE_DIR}"
 
 # Parse bing.com and acquire picture URL(s)
-read -ra urls < <(curl -sL $PROTO://www.bing.com | \
-    grep -Eo "url\(.*?\)" | \
-    sed -e "s/url(\([^']*\)).*/http:\/\/bing.com\1/" | \
+read -ra urls < <(curl -sL "$PROTO://www.bing.com/HPImageArchive.aspx?format=js&n=$BOOST" | \
+    jq -r '.images | reverse | .[] | .url' | \
+    sed -e "s/\(.*\)/$PROTO:\/\/bing.com\1/" | \
     transform_urls)
 
-if [ -n "$BOOST" ]; then
-    read -ra archiveUrls < <(curl -sL "$PROTO://www.bing.com/HPImageArchive.aspx?format=js&n=$BOOST" | \
-        grep -Eo "url\(.*?\)" | \
-        sed -e "s/url(\([^']*\)).*/http:\/\/bing.com\1/" | \
-        transform_urls)
-    urls=( "${urls[@]}" "${archiveUrls[@]}" )
-fi
-
 for p in "${urls[@]}"; do
     if [ -z "$FILENAME" ]; then
         filename=$(echo "$p" | sed -e 's/.*[?&;]id=\([^&]*\).*/\1/' | grep -oe '[^\.]*\.[^\.]*$')
     else
         filename="$FILENAME"
     fi
     if [ -n "$FORCE" ] || [ ! -f "$PICTURE_DIR/$filename" ]; then
-        print_message "Downloading: $filename..."
+        print_message "Downloading: $filename from $p..."
         curl $CURL_QUIET -Lo "$PICTURE_DIR/$filename" "$p"
     else
         print_message "Skipping: $filename..."
     fi
 done
 
 if [ -n "$SET_WALLPAPER" ]; then
+    print_message "Setting wallpaper to $PICTURE_DIR$filename"
     /usr/bin/osascript<<END
-tell application "System Events" to set picture of every desktop to ("$PICTURE_DIR/$filename" as POSIX file as alias)
+tell application "System Events" to tell every desktop to set picture to "$PICTURE_DIR$filename"
 END
 fi