Python script to change iTerm2 titlebar color. Supply three or six digit hex color string on the command line and it will convert to iTerm2 escape codes.

tabcolor.py

#! /usr/bin/env python3
# usage:  tabcolor '#FF00FF'


import sys

if len(sys.argv) > 1:

    color = sys.argv[-1]
    if color[0] == "#" and len(color) in {7,4}:
        rgb = color[1:]
        rc,gc,bc = {3:(rgb[0]*2,rgb[1]*2,rgb[2]*2,),6:(rgb[0:2],rgb[2:4],rgb[4:6])}[len(rgb)]
        r,g,b = (int(n,base=16) for n in (rc,gc,bc))
        sys.stdout.write("\033]6;1;bg;red;brightness;%d\a" % int(r))
        sys.stdout.write("\033]6;1;bg;green;brightness;%d\a" % int(g))
        sys.stdout.write("\033]6;1;bg;blue;brightness;%d\a" % int(b))

    elif color.count("."):
        r,g,b = map(float,sys.argv[-1].split(","))
        sys.stdout.write("\033]6;1;bg;red;brightness;%d\a" % int(r * 255))
        sys.stdout.write("\033]6;1;bg;green;brightness;%d\a" % int(g * 255))
        sys.stdout.write("\033]6;1;bg;blue;brightness;%d\a" % int(b * 255))

else:

    r,g,b = (0,0.147,0.159)
    sys.stdout.write("\033]6;1;bg;red;brightness;%d\a" % int(r * 255))
    sys.stdout.write("\033]6;1;bg;green;brightness;%d\a" % int(g * 255))
    sys.stdout.write("\033]6;1;bg;blue;brightness;%d\a" % int(b * 255))


sys.stdout.flush()