Write all conditionals in wm with [[ ]]

.config/bin/wm

@@ -63,7 +63,7 @@ clear_desktop ()
 
 popup ()
 {
-    if [ $# -eq 0 ];then
+    if [[ $# -eq 0 ]];then
         usage
     fi
 
@@ -71,7 +71,7 @@ popup ()
     shift
 
     # If the program is not yet running, launch it and monitor the node creation
-    if [ -z `xdotool search --classname $name` ];then
+    if [[ -z `xdotool search --classname $name` ]];then
         bspc subscribe node_add --count 1 | cut -d ' ' -f 5 > /tmp/win_${name} &
         kitty --name $name $*
         sleep .5
@@ -85,7 +85,7 @@ peek ()
 {
     case $1 in
         left|right)
-            if [ `bspc config --desktop focused $1_padding` -gt 0 ]; then
+            if [[ `bspc config --desktop focused $1_padding` -gt 0 ]]; then
                 bspc config --desktop focused $1_padding 0
             else
                 bspc config --desktop focused $1_padding 500
@@ -117,7 +117,7 @@ goto ()
     case $1 in
         next)
             # Create a new desktop if needed
-            if [ "$current" -eq "$last" ]; then
+            if [[ "$current" -eq "$last" ]]; then
                 let "last += 1"
                 echo $last > $LASTDESK
                 bspc monitor --add-desktops $last