Add RAM used/total format strings

[SadSock]

Hi, would it be possible to add RAM used/total format strings?

Currently tmux-cpu provides #{ram_percentage}, but I’d like to display memory usage as an absolute value, for example:

MEM 49/2015GB

Possible format strings could be:

• #{ram_used}
• #{ram_total}
• #{ram_used_total}

This would make it possible to show actual memory usage without adding a custom wrapper script around free.

[Liumingxun]

second this