Auto recompile Latex in the background on OS X

watch-latex.sh

#!/bin/bash
###
# A Script that automatically recompiles your
# Latex in the background on Mac OS X.
###

# Options
BIN_PATH=/usr/texbin
FILE=main
WATCH_FILE=chapters

# The script
PREVIOUS=""
while [ true ] ; do
	# Calculate any difference using crc32. CRC is nice and quick.
	NOW=`crc32 $WATCH_FILE.tex`
	if [ ! "$NOW" == "$PREVIOUS" ]; then
		echo "Diff!"
		PREVIOUS=$NOW

		# Run first pdf comile
		$BIN_PATH/pdflatex -halt-on-error  $FILE.tex
		if [ $? -eq 1 ]; then # If error code
			echo -e "\033[31m Compilation error\033[0m"
			# Stop and wait until changed again
			continue
		fi;
		
		# Compile the bibtech. 
		for aux in `ls *.aux`; do
			$BIN_PATH/bibtex $aux
		done
			
		
		# Compile latex twice. Just because its a stupid language.
		$BIN_PATH/pdflatex -halt-on-error  $FILE.tex > /dev/null
		$BIN_PATH/pdflatex -halt-on-error  $FILE.tex > /dev/null
		
		#Open with Preview in the background
		open -g $FILE.pdf
	fi
	sleep 1;
done