slack-post shell script

slack-post

#!/usr/bin/env bash

###############################################################################
#
# ./slack-post
#
# A script for sending a system message to a channel.
#
# Docs:
#
# Usage:
#   cat message.txt | ./slack-post -f "System"
#   echo -e "New\nline" | ./slack-post -f "System"
#
###############################################################################

# exit on failure
set -e
# http://apple.stackexchange.com/questions/68684/why-sh-c-echo-n-1-is-different-from-bash-c-echo-n-1
shopt -u xpg_echo

usage() {
  cat << EOF
Usage: $0 [-f <from name> -r <color>]

This script will read from stdin and send the contents to the given channel.

OPTIONS:
   -h             Show this message
   -f <from name> Bot name
EOF
}

# Include hipchat defaults if available
test -f /etc/slackrc && . /etc/slackrc
if [ -f ~/.slackrc ]; then
  echo 'found .slackrc config'
  source ~/.slackrc
fi

FROM=${SLACK_FROM:-}
WEBHOOK_URL=${SLACK_WEBHOOK_URL:-}

if [ -z "$WEBHOOK_URL" ]; then
  cat << EOF
Configure slack-post by creating a config file at ~/.slackrc or /etc/slackrc
and adding your Incoming Webhook app's URL:

  SLACK_WEBHOOK_URL="https://hooks.slack.com/services/SOMETHING/LIKE/THISSECRETURL"

EOF
  usage
  exit 1
fi

while getopts "hf:c:" OPTION; do
  case $OPTION in
    h) usage; exit 1;;
    f) FROM=$OPTARG;;
    [?]) usage; exit;;
  esac
done

if [ -z "$INPUT" ]; then
  # read stdin
  INPUT=$(cat)
fi

PAYLOAD="payload={\"text\": \"$INPUT\""
if [ -n "$FROM" ]; then
  PAYLOAD="$PAYLOAD,\"username\":\"$FROM\""
fi
PAYLOAD="$PAYLOAD}"

curl -X POST --data-urlencode "$PAYLOAD" $WEBHOOK_URL