Overrustle channellogs downloader

download-overrustle

#!/bin/bash

channel="$1"
start="$2"
end="$3"

function validate {
    [ -n "$channel" ] &&  [ -n "$start" ] && [ -n "$end" ]
}

if ! validate; then
    echo >&2 "Usage: $0 channelName 2018-06-01 2019-01-01"
    exit
fi

function dateMillis {
    date -d "$1" +%s
}

# so that invalid date formats that make date fail
# kill the script
set -e

startMillis="$(dateMillis "$start")"
endMillis="$(dateMillis "$end")"

if [[ "$startMillis" -gt "$endMillis" ]]; then
    echo >&2 "End date is not higher than start date"
    exit 2
fi

set +e

normalizedEnd="$(date -d "$end" +%Y-%m-%d)"

function generateDateSequence {
    i=0
    while true; do
        date -d "$start $i days" '+https://overrustlelogs.net/$channel%%20chatlog/%B%%20%Y/%Y-%m-%d.txt'

        if [[ "$(date -d "$start $i days" '+%s')" -eq "$endMillis" ]]; then
            break
        fi

        i="$(("$i" + 1))"
    done
}

curl $(generateDateSequence | tr '\n' ' ')