#!/bin/bash
# usage: retex [--bibtex] CMD INPUTNAME (without .tex)

set -e

# Add a bibtex option for the streaming notes.
# Since the bibtex needs to be part of the fixed-pointing, I unfortunately don't
# see a better way to handle it than as part of retex.  - Matt 2008-09-02
if [ "$1" == --bibtex ]; then
	bibtex=1
	shift
fi

if [ $# != 2 ]; then
	echo >&2 'usage: retex [--bibtex] CMD INPUTNAME (without .tex)'
	exit 1
fi

cmd="$1"
in="$2"
shift 2

# Just Work if passed `foo.tex'.
if [ "$in" != "${in%.tex}" ]; then
	in="${in%.tex}"
fi

function run {
	if [ $bibtex ] && [ -r "$in.aux" ]; then
		echo "[$iter] Running bibtex..."
		bibtex "$in.aux"
		# Work around \href commands getting line-broken in places that
		# break things ~ Matt 2010-12-17
		sed -i -e '/%$/{N; s/%\n//}; /\\href$/{N; s/\n/ /}' "$in.bbl"
	fi
	echo "[$iter] Running $2..."
	"$cmd" -file-line-error -halt-on-error "$in"
}

function compare {
	echo "Comparing files..."
	for f in "$in."*; do
		# ignore pdfs because they have a nonreproducible "ID" at the end
		# and logs because they have a less-reproducible time; neither are read
		if [ "$f" == "${f#$in.retex-keep.}" ] && [ "$f" == "${f%.pdf}" ] && [ "$f" == "${f%.log}" ]; then
			suf="${f#$in.}"
			cmp "$in.retex-keep.$suf" "$in.$suf" || return $?
		fi
	done
	echo "Reached a fixed point."
}

function keep {
	echo "Keeping files..."
	for f in "$in."*; do
		if [ "$f" == "${f#$in.retex-keep.}" ]; then
			suf="${f#$in.}"
			cp "$in.$suf" "$in.retex-keep.$suf"
		fi
	done
}

function clean {
	echo "Cleaning up kept files..."
	rm -f "$in.retex-keep."*
}

iter=0
keep
run || exit $?
limit=10
while ! compare; do
	iter=$(($iter + 1))
	if [ $iter -ge $limit ]; then
		echo "Did not reach a fixed point in $limit tries."
		exit 2
	fi
	keep
	run || exit $?
done
clean
echo "Successful."