Print Windows WLAN IPv4 address in WSL.

hostip.py

import os

pipe = os.popen('ipconfig.exe')
text = pipe.buffer.read().decode('gbk')
ip_line = (line for line in text.split('\r\n') if 'IPv4' in line)
try:
    ip_addr = next(ip_line).split(':')[-1].strip()
    print(ip_addr)
except StopIteration:
    exit(1)

pon.sh

# Exports HTTP_PROXY environments.
pon() {
    local hostip=$(python3 ~/hostip.py)
    if [[ -n $hostip ]]; then
        export http_proxy="http://$hostip:10811"
        export https_proxy="https://$hostip:10811"
    fi
}

poff() {
    unset http_proxy
    unset https_proxy
}