irix: Memory usage

pfetch

@@ -641,7 +641,24 @@ get_memory() {
         ;;
 
         IRIX*)
-            # TODO
+            # Read the memory information from the 'top' command. Parse
+            # and split each line until we reach the line starting with
+            # "Memory".
+            #
+            # Example output: Memory: 160M max, 147M avail, .....
+            while IFS=' :' read -r label mem_full _ mem_free _; do
+                case $label in
+                    Memory) 
+                        mem_full=${mem_full%M}
+                        mem_free=${mem_free%M}
+                        break 
+                    ;;
+                esac
+            done <<-EOF
+                $(top -n)
+			EOF
+
+            mem_used=$((mem_full - mem_free))
         ;;
     esac