createNextMonth

#!/usr/bin/env bash

set -e

DIRECTORY=$(cd `dirname $0` && pwd)

nextMonth=$(date -d"next month" +%Y-%m);
if [[ $1 =~ ^[0-9]{4}-[0-9]{2}$ ]];then
  nextMonth=$1
fi

dayOfWeek=$(date -d"${nextMonth}-01" +%u)
tuesday=2

if [[ $dayOfWeek > $tuesday ]]; then
    firstTuesday=$(echo "(7-${dayOfWeek})+1+${tuesday}" | bc)
else
    firstTuesday=$(echo "(${tuesday}-${dayOfWeek})+1" | bc)
fi

fullDate=$(printf "%s-%02d" "${nextMonth}" ${firstTuesday});

n=$(date -d$fullDate  +"%d")
 
if [ $n -ge 11 -a $n -le 13 ] ; then
  ordinal="th"
else
 case $(( $n%10 )) in
 1)
   ordinal=st
   ;;
 2)
   ordinal=nd
   ;;
 3)
   ordinal=rd
   ;;
 *)
   ordinal=th
   ;;
 esac
fi

monthName=$(date -d$fullDate +%B)
day=$(date -d$fullDate +%e | tr -d " ")
year=$(date -d$fullDate +%Y)


head=$(echo "---
layout: post-slots
title: Meetup on the ${day}${ordinal} of $monthName, $year
datetitle: $monthName ${day}${ordinal}, 2015
published: false
meetupdate: $fullDate
---")

content=$(echo "$head"; tail -n +8 "${DIRECTORY}/_posts/_template.html");


lowerCaseMonth=$(echo $monthName|tr '[:upper:]' '[:lower:]')
fileNameMd="${DIRECTORY}/_posts/${fullDate}-${lowerCaseMonth}.md"

echo $fileNameMd
if [[ ! -f $fileNameMd ]]; then
    echo "File not found!"
    echo "Create a new Post"

    echo "$content" > $fileNameMd
else
    echo "Post already exists"
fi