Install matching bash completion script for current hg version.

install_hg_bash_completion

#!/bin/bash

set -eu

hg_version=$(hg --version | grep version | sed 's,^.*(version ,,; s,).*,,')
hg_base_url=https://selenic.com/hg/rawfile/${hg_version}/contrib/bash_completion

tmp_file=/tmp/hg_completion.bash
cur_file=/usr/local/etc/bash_completion.d/hg

# Get requested version
curl -o ${tmp_file} ${hg_base_url}

# see if it is a change
if cmp --quiet ${tmp_file} ${cur_file}; then
    echo "Already set for ${hg_version}"
else
    mv ${tmp_file} ${cur_file}
fi