Convert Scriptogr.am markdown to Octopress markdown compatible files

convert-to-octopress.sh

#! /bin/bash
# convert scriptogr.am markdown to Octopress/Jekyll markdown

if [ -z "$1" ]
  then
	 echo "No input files supplied"

else
	if [ ! -f $1 ]
		then
		 echo "File $1 does not exist."
	else

		filename=$1

		# echo "converting to lowercase"
		sed -i '' -e "s/Title: /title: /" $filename
		sed -i '' -e 's/Tags: /categories: /' $filename
		sed -i '' -e 's/Date: /date: /' $filename

		# echo "remove excerpt"
		sed -i '' -e '/Excerpt: /d' $filename

		# echo "set header start marker at the beginning (---)"
		sed -i '' -e 's/date: /---\'$'\ndate: /' $filename 

		# echo "add a layout:post line"
		sed -i '' -e 's/\(date:\)/layout: post  \'$'\ndate:/g' $filename 

		# echo "convert categories and set a header end marker at the end"
		sed -i '' -e 's/\(categories:\) \(.*\) \(.$\)/\1 [\2]  \'$'\n---  /' $filename

		echo "done!"
	fi
fi