disk: Fix bash 3.2 incompatibility. Closes #1586

neofetch

@@ -3586,7 +3586,7 @@ get_disk() {
     for disk in "${disks[@]}"; do
         # Create a second array and make each element split at whitespace this time.
         IFS=" " read -ra disk_info <<< "$disk"
-        disk_perc=${disk_info[-2]/\%}
+        disk_perc=${disk_info[${#disk_info[@]} - 2]/\%}
 
         case $disk_percent in
             off) disk_perc=
@@ -3594,29 +3594,34 @@ get_disk() {
 
         case $df_version in
             *befhikm*)
-                disk="$((disk_info[-4]/1024/1024))G / $((disk_info[-5]/1024/1024))G"
-                disk+="${disk_perc:+ ($disk_perc%)}"
+                disk=$((disk_info[${#disk_info[@]} - 4] / 1024 / 1024))G
+                disk+=" / "
+                disk+=$((disk_info[${#disk_info[@]} - 5] / 1024/ 1024))G
+                disk+=${disk_perc:+ ($disk_perc%)}
             ;;
 
             *)
-                disk="${disk_info[-4]/i} / ${disk_info[-5]/i}${disk_perc:+ ($disk_perc%)}"
+                disk=${disk_info[${#disk_info[@]} - 4]/i}
+                disk+=" / "
+                disk+=${disk_info[${#disk_info[@]} - 5]/i}
+                disk+=${disk_perc:+ ($disk_perc%)}
             ;;
         esac
 
         case $disk_subtitle in
             name)
-                disk_sub=${disk_info[*]::${#disk_info[@]}-5}
+                disk_sub=${disk_info[*]::${#disk_info[@]} - 5}
             ;;
 
             dir)
-                disk_sub=${disk_info[-1]/*\/}
-                disk_sub=${disk_sub:-${disk_info[-1]}}
+                disk_sub=${disk_info[${#disk_info[@]} - 1]/*\/}
+                disk_sub=${disk_sub:-${disk_info[${#disk_info[@]} - 1]}}
             ;;
 
             none) ;;
 
             *)
-                disk_sub=${disk_info[-1]}
+                disk_sub=${disk_info[${#disk_info[@]} - 1]}
             ;;
         esac