hots_weekly.zsh

#!/bin/zsh

# list of heroes and the id used to display their icons
typeset -A heroes
heroes=(
  122 "Abathur" 362 "Anub'arak" 345 "Arthas" 371 "Azmodan" 354 "Brightwing" 381 "Chen" 321 "Diablo" 312 "E.T.C."
  220 "Falstad" 155 "Gazlowe" 196 "Illidan" 393 "Jaina" 233 "Kerrigan" 114 "Li Li" 277 "Malfurion" 329 "Muradin"
  412 "Murky" 144 "Nazeebo" 259 "Nova" 133 "Raynor" 432 "Rehgar" 285 "Sgt. Hammer" 249 "Sonya" 337 "Stitches"
  439 "Sylvanas" 165 "Tassadar" 403 "The Lost Vikings" 451 "Thrall" 182 "Tychus" 303 "Tyrael" 173 "Tyrande"
  420 "Uther" 268 "Valla" 459 "Zagara" 294 "Zeratul"
)

# page to scrape for information
url="http://heroesofthestorm.github.io/free-hero-rotation"

# retrieve the weekly hero rotation
typeset -a weekly
weekly=(${(f)"$(wget -qO- $url | \
                sed -n '/<h2>/{:loop n; s|.*type="button">\([^<]*\)</button>$|\1|p; /<h2>/q; b loop}')"})

local_checksum=$(getfattr --only-values -n user.checksum "$0" 2>/dev/null)
remote_checksum=${$(echo ${weekly[@]} | md5sum)[(w)1]}

# only run on updates
if [[ $local_checksum != $remote_checksum ]]; then
  # update checksum
  setfattr -n user.checksum -v "$remote_checksum" "$0"

  # retrieve random hero id
  hero=${${(k)heroes}[RANDOM%$#heroes+1]}

  # strings for payload
  text="<$url|Free Week Rotation for Heroes of the Storm:>\n${(j:, :)weekly}"
  icon_url="http://media.heroesnexus.com/avatars/thumbnails/346/$hero/65/65/icon.png"

  # post to slack
  curl \
    -X POST \
    --data-urlencode \
      'payload={"text": "'$text'", "channel": "#hots", "username": "'${heroes[$hero]}'", "icon_url": "'$icon_url'"}' \
    https://hooks.slack.com/services/my/secret/url
else
  echo "nothing to do"
fi

# vim: nowritebackup nobackup noswapfile