Create a manifest.appcache for a given html file

manifest-create

#!/bin/bash

SWITCH="\e["
NRM="${SWITCH}0m" YLW="${SWITCH}33m" RED="${SWITCH}31m"
GRN="${SWITCH}32m"
BLU="${SWITCH}34m"

dir=$(dirname "${BASH_SOURCE[0]}")
function error {
	echo -e $RED$@$NRM
}
function info {
	echo -e $BLU$@$NRM
}
function warn {
	echo -e $YLW$@$NRM
}
function green {
	echo -e $GRN$@$NRM
}
function manifestComment {
	local manifest=$1
	shift
	if [[ ! -f "$manifest" ]]; then
		error "The manifest file \"$manifest\" does not exist."
		return 1
	fi
    echo "$@" >> $manifest
}
function manifestPart {
	local manifest=$1
	local part=$2
	shift
	shift
	local entries="$@"
	if [[ ! -f "$manifest" ]]; then
		error "The manifest file \"$manifest\" does not exist."
		return 1
	fi
	if [[ "$part" == "" ]]; then
		error "The manifest section $BLU must $RED be passed as the second parameter."
		return 1
	fi
	echo "$part" >> $manifest
    for entry in $entries; do
		local e=$(echo "$entry" | sed 's/^\\//g')
    	echo "$e" >> $manifest
    done
	echo -e >> $manifest
    return 0
}
function manifestHead {
	local manifest=$1
	if [[ ! -f "$manifest" ]]; then
		error "The manifest file \"$manifest\" does not exist."
		return 1
	fi
	echo "CACHE MANIFEST" > $manifest
	echo -n '# ' >> $manifest
	echo -n "v1 - " >> $manifest
	date +"%Y-%m-%d %k:%M" >> $manifest
	echo -e >> $manifest
}


if [[ -f "$1" ]]; then
	html=$1
else
	html=index.html
	if [[ ! -f "$html" ]]; then
		error "No $BLU'index.html'$NRM found. An html file to parse must be passed as the first parameter"
		exit 1
	fi
fi
shift
if [[ "$1" != "" ]]; then
	manifest_actual="$1"
else
	manifest_actual="manifest.appcache"
fi

tmp_css=$(mktemp -t)
tmp_js=$(mktemp -t)
tmp_manifest=$(mktemp -t)
tmp_err=$(mktemp -t)

xmllint --xpath "//link/@href" --html "$html" 2> $tmp_err > $tmp_css
xmllint --xpath "//script/@src" --html "$html" 2> $tmp_err >> $tmp_js

sed -i 's/ href="//g' $tmp_css
sed -i 's/ src="//g' $tmp_js
css=$(sed 's/"/\n/g' $tmp_css | sort -V)
jss=$(sed 's/"/\n/g' $tmp_js | sort -V)

manifestHead $tmp_manifest
if [[ "$?" != "0" ]]; then
	/bin/rm -f $tmp_js
	/bin/rm -f $tmp_css
	/bin/rm -f $tmp_manifest
	exit 1
fi

manifestPart $tmp_manifest "CACHE:" $jss $css
manifestPart $tmp_manifest "NETWORK:" '/api' '/api/* \*'
echo "FALLBACK:" >> $tmp_manifest
manifestComment $tmp_manifest '# /api/ fallback.html'
echo -e >> $tmp_manifest
manifestPart $tmp_manifest "SETTINGS:" "prefer-online"

cp -Rf $tmp_manifest "$manifest_actual"
/bin/rm -f $tmp_js
/bin/rm -f $tmp_css
/bin/rm -f $tmp_manifest
/bin/rm -f $tmp_err