#! /bin/zsh
#
# this file:
#   http://user.it.uu.se/~embe8573/conf/.zsh/web
#   https://dataswamp.org/~incal/conf/.zsh/web

dupl-links () {
    local page=${1:-~/public_html/index.html}
    grep --color=never -o -P "<a href=\".*?\">" $page | grep -v "#" | sort | uniq -D | uniq
}

broken-links () {
    local url=$1

    local log_whole=bl-whole.log
    local log_errs=bl-errs.log

    wget --spider -r -nd -nv -o $log_whole $url

    grep --color=never -B1 "broken link!" $log_whole > $log_errs

    rm $log_whole
}

validate-ebc () {
    local hp_path=~/public_html

    echo "CSS check..."
    validate-html-and-css $hp_path/**/*.css
    echo "CSS check...done"

    echo -n "HTML check..."
    local h
    for h in $hp_path/**/*.html; do
        validate-html-and-css $h
        broken-links          $h
    done
    echo "done"
}
alias ebc=validate-ebc
alias validate=validate-ebc
alias verify-ebc=validate-ebc

validate-html-and-css () {
    local -a files
    files=($@)

    local ext
    for f in $files; do
        ext=${f:e}

        case $ext in
            (htm|html)
                tidy -q -errors $f
                [[ $? == 1 ]] && echo "in file $f\n" ;;
            (css)
                echo "\n$f:"
                csstidy $f --compress_colors=false --silent ;;
        esac
    done
}

prefix-len () {
    local user_hosts=$1
    local hosts=$(( $user_hosts + 2 )) # network and broadcast
    local len=$(( 32 - ceil(log($hosts)/log(2)) ))
    printf "%g\n" $len
}

test-speed () {
    local file=m100.data
    local user=$(whoami)
    local host=$(hostname)
    local system=dataswamp.org
    local dir=speed
    local url=https://$system/~$user/$dir/$file

    rm -f $file

    dd if=/dev/urandom         \
       of=$file                \
       count=$(( 1024 * 100 )) \
       bs=1024 2> /dev/null | sha256sum | ( read rnd _; echo $rnd >> $file )

    local bytes=$(stat --format "%s" $file)

    local ul_start=$(date -Is)
    local ul_time
    rsync -aLvq $file ${system}:public_html/$dir/
    ul_time=$(dateutils.ddiff $ul_start now)

    local ul_secs=${ul_time%s}
    local ul_speed=$(( $bytes / 1024 / $ul_secs ))
    echo "$bytes bytes -> $user@$system: $ul_time (${ul_speed} KiB/s)"

    local dl_start=$(date -Is)
    local dl_time
    wget -q -O /dev/null $url
    dl_time=$(dateutils.ddiff $dl_start now)

    local dl_secs=${dl_time%s}
    local dl_speed=$(( $bytes / 1024 / $dl_secs ))
    echo "$bytes bytes -> $user@$host: $dl_time (${dl_speed} KiB/s)"
}

sleep-until-internet () {
    while ( $ping-test ); do
        sleep 1
    done
}

when-internet-set-time () {
    sleep-until-internet
    ntpdate pool.ntpdate.org
}

print-internet-down () { print-label 1 0 " down " }
print-internet-up   () { print-label 2 0 " up "   }

ping-test () {
    local quiet=$1

    local google=8.8.8.8 # Google's high-availability DNS
    ping -w 2 -c 1 $google &> /dev/null
    local up=$?

    (( ! ${+quiet} )) &&
        if (( $up == 0 )); then
            print-internet-up
        else
            print-internet-down
        fi
    return $up
}
alias {pingtest,pt}=ping-test

alias dhc="sudo dhclient $NET
"