i3-disp-size

#! /bin/bash
#
# i3-disp-size
# Displays the focused container's dimensions in that container's corner.
#
# Written by GermainZ and kjetilho from #i3@freenode
#
# Dependencies:
#
# - i3 <https://i3wm.org/>
# - xosd <http://sourceforge.net/projects/libxosd/>
# - xwininfo (xorg-x11-utils)
# - xdotool
#
# Usage:
#
# In your i3 config, execute this script after resize commands, and
# kill osd_cat when exiting the resize mode. For example:
#
# mode "resize" {
#     bindsym h resize shrink width 10 px or 1 ppt, exec --no-startup-id "i3-disp-size"
#     bindsym j resize grow height 10 px or 1 ppt, exec --no-startup-id "i3-disp-size"
#     bindsym k resize shrink height 10 px or 1 ppt, exec --no-startup-id "i3-disp-size"
#     bindsym l resize grow width 10 px or 1 ppt, exec --no-startup-id "i3-disp-size"
#     bindsym Return mode "default", exec --no-startup-id "pkill osd_cat"
#     bindsym Escape mode "default", exec --no-startup-id "pkill osd_cat"
# }

fontsize=24  # in pixels

# osd_cat only supports old style XLFD font names, not pango.
style=( --colour yellow
        --outline 1 --outlinecolour black
        --shadow 3 --shadowcolour darkgrey
        --font "-*-*-bold-r-*-*-$fontsize-*-100-100-*-*-iso8859-1" )

# Get focused container's rectangle
eval "$(xdotool getwindowfocus getwindowgeometry --shell)"

# Get character cell geometry instead (useful for terminals and Emacs)
# If you want pixel size always, just remove the next command.
eval $(xwininfo -id "$WINDOW" |
           awk -F'[^0-9]+' '/-geometry/ { print "WIDTH=" $2; print "HEIGHT=" $3 }')

# Kill previous instances.
pkill osd_cat

# Draw text.
printf "%s×%s" "$WIDTH" "$HEIGHT" | osd_cat -i $X -o $Y "${style[@]}"