memory: simplify

neofetch

@@ -1432,12 +1432,20 @@ get_gpu() {
 get_memory() {
     case "$os" in
         "Linux" | "Windows")
-            IFS=$'\n'":kB" read -d "" -ra mem < /proc/meminfo
-
             # MemUsed = Memtotal + Shmem - MemFree - Buffers - Cached - SReclaimable
             # Source: https://github.com/KittyKatt/screenFetch/issues/386#issuecomment-249312716
-            mem_used="$(((mem[1] + mem[64] - mem[4] - mem[11] - mem[14]- mem[70]) / 1024))"
-            mem_total="$((mem[1] / 1024))"
+            while IFS=":" read -r a b; do
+                case "$a" in
+                    "MemTotal") mem_used="$((mem_used+=${b/kB}))"; mem_total="${b/kB}" ;;
+                    "Shmem") mem_used="$((mem_used+=${b/kB}))"  ;;
+                    "MemFree" | "Buffers" | "Cached" | "SReclaimable")
+                        mem_used="$((mem_used-=${b/kB}))"
+                    ;;
+                esac
+            done < /proc/meminfo
+
+            mem_used="$((mem_used / 1024))"
+            mem_total="$((mem_total / 1024))"
         ;;
 
         "Mac OS X" | "iPhone OS")