tmux - Resize pane to specific width and height

Quick post on how to resize a tmux-pane to a specific width and height.
I'm presuming you only have one session and that you've changed base-index to 1 and your prefix key combo to ctrl+a (ctrl+b is silly).

.tmux.conf

# 1 is easier to reach than 0
set -g base-index 1

# make tmux behave more screen-like
unbind C-b
set -g prefix C-a
bind-key C-a last-window

# run nested multiplexers and send prefix with ctrl+a a as in screen
bind-key a send-prefix

# make pane right size
bind-key k run-shell "/path/to/the/script/below.sh"

I use this to set my irssi-pane to the correct width and height when I resize my client. I have a 3-pane setup with one pane to the left and two panes to the right split vertically so I really only need to resize this one pane and the other two will follow along.

$ses is session id. I guess changing it to a sessionname should work, have yet to try it though.
$win is the window in which your pane resides.
$id is pane id within the window which you can get with ctrl+a q.
$height is the height you want your pane to be.
$width ... duh.

You might want to take these variables from stdin, I just couldn't be bothered.

#!/bin/bash
ses=0
win=1
id=2
height=50
width=80

paneWidths=$(tmux list-panes -t $ses:$win | awk '{print $2}' | cut -c 2- | cut -f 1 -d'x')
paneHeights=$(tmux list-panes -t $ses:$win | awk '{print $2}' | cut -c 2- | cut -f 2 -d'x' | cut -f 1 -d']')

currentWidth=$(echo $paneWidths | awk "{ print \$($id+1) }")
currentHeight=$(echo $paneHeights | awk "{ print \$($id+1) }")

resizeNumW=$(expr $currentWidth - $width)
resizeNumH=$(expr $currentHeight - $height)

if [ ${resizeNumW} -ge 0 ]; then
 dirw="R"
else
 dirw="L"
 resizeNumW="$((-${resizeNumW}))"
fi

if [ ${resizeNumH} -ge 0 ]; then
 dirh="D"
else
 dirh="U"
 resizeNumH="$((-${resizeNumH}))"
fi

## DEBUG
#echo ws: $paneWidths
#echo hs: $paneHeights

#echo cw: $currentWidth
#echo ch: $currentHeight

#echo rw: $resizeNumW
#echo rh: $resizeNumH

#echo dw: $dirw
#echo dh: $dirh

if [ ${resizeNumW} -ne 0 ]; then
 tmux resize-pane -t $ses:$win.$id -$dirw $resizeNumW
fi

if [ ${resizeNumH} -ne 0 ]; then
 tmux resize-pane -t $ses:$win.$id -$dirh $resizeNumH
fi

I might expand on this at a later time... maybe.