#!/bin/bash

# Changeable options
url="https://www.archlinux.org/mirrorlist"
countries=("BE" "NL")
protocols=("http" "https")
ip_versions=(4)
dest="/etc/pacman.d/mirrorlist"

# Functions
function fold () { /usr/bin/fold --spaces --width=$(tput cols); }

function _urlify-1 ()
{
    local items=($@)
    for item in "${items[@]:1}"; do
        echo "$1=${item}"
    done
}

function urlify ()
{
    local uitems=($(_urlify-1 $@))
    local IFS="&"
    echo "${uitems[*]}"
}

function make-url ()
{
    local countryparams=$(urlify country ${countries[@]})
    local protocolparams=$(urlify protocol ${protocols[@]})
    local ipparams=$(urlify ip_version ${ip_versions[@]})

    echo "${url}/?${countryparams}&${protocolparams}&${ipparams}"
}

# Load config file
cfgfile=${XDG_CONFIG_HOME:-"${HOME}/.config"}/update-mirrors/config.sh
[ -x $cfgfile ] && source $cfgfile

# Check destination
if [[ ! -e "$dest" ]] && [[ ! -w "$(dirname "$dest")" ]]; then
    echo "Need write permission for $(dirname "$dest") to create \
${dest}. Perhaps you should use sudo." | fold >&2
    exit 1
elif [[ -e "$dest" ]] && [[ ! -w "$dest" ]]; then
    echo "Need write permission for ${dest}, perhaps you should use \
sudo." | fold >&2
    exit 1
fi

# Download, ready, output
curl -s "$(make-url)" | sed 's/^#\([^#].*\)/\1/' > "$dest"
echo "Saved in ${dest}"