memory: openbsd memory detection

pfetch

@@ -393,6 +393,26 @@ get_memory() {
             # If you run OpenBSD and can send me the full output of
             # 'vm_stat' I'll be able to add full support here.
             mem_full=$(($(sysctl -n hw.physmem) / 1024 / 1024))
+
+            # This is a really simpler parser for 'vmstat' which grabs
+            # the used memory amount in a lazy way. 'vmstat' prints 3
+            # lines of output with the needed value being stored in the
+            # third and last line.
+            #
+            # This loop simply grabs the 3rd element of each line until
+            # the EOF is reached. Each line overwrites the value of the
+            # previous so we're left with what we wanted. This isn't
+            # slow as only 3 lines are parsed!
+            while read -r _ _ line _; do
+                mem_used=${line%%M}
+
+            # Using '<<-EOF' is the only way to loop over a command's
+            # output without the use of a pipe ('|').
+            # This ensures that any variables defined in the while loop
+            # are still accessible in the script.
+            done <<-EOF
+                $(vmstat)
+			EOF
         ;;
 
         FreeBSD*)
@@ -419,7 +439,7 @@ get_memory() {
         ;;
     esac
 
-    log memory "${mem_used:-?}MiB / ${mem_full:-?}MiB" >&6
+    log memory "${mem_used:-?}M / ${mem_full:-?}M" >&6
 }
 
 get_ascii() {