#!/bin/sh
set -e

argv0="$0"

# cats out the configuration or {'\n', EOF} if it can't be found
stream_config(){
	for file in \
			"$HOME"/.config/xdg-sanity.conf \
			"$HOME"/.xdg-sanity.conf \
			/etc/xdg-sanity/xdg-sanity.conf \
			/dev/null
	do
		cat "$file" 2>/dev/null \
			&& break \
			|| true
	done
}

# check if usage is valid
if ! test -n "$1"; then
	printf "Usage: %s [resource...]\n" "$argv0" 1>&2
	exit 64 # sysexits(3) EX_USAGE
fi

# check if we have curl(1)
if ! command -v curl >/dev/null 2>&1; then
	printf "%s: Missing dependency: curl(1)\n" "$argv0" 1>&2
	exit 71 # sysexits(3) EX_OSERR
fi

# check if we have handlr(1), but we might not need it
if ! command -v handlr >/dev/null 2>&1; then
	alias handlr=false
fi

test -n "$BROWSER" || BROWSER="$(stream_config | sed -ne 's/^browser *= *//p')"

# check if we have a $BROWSER
if ! test -n "$BROWSER"; then
	printf "\
%s: \$BROWSER not filled.
	Please place the path to your default browser's executable in
	/etc/xdg-sanity/xdg-sanity.conf
" "$argv0" 1>&2
	exit 71 # sysexits(3) EX_OSERR
fi

while test -n "$1"; do
	argv1="$1"

	# use curl(1) to write out the request header's content_type,
	# strip everything after the first semicolon,
	# chop off any weird whitespace remnants
	MIME="$(curl -Ls -o /dev/null -w '%{content_type}' $1 | sed 's/\;.*//' | xargs echo)"

	# RESPONSE_CODE=$(curl -fLIs "$INPUT" | sed -ne 's/ [[:space:]]*$//p' | sed -ne 's|^HTTP/.\+ ||p')

	for extension in /etc/xdg-sanity/extensions/*.sh; do
		! [ "$extension" = "/etc/xdg-sanity/extensions/*.sh" ] || break
		# switch(extension_type)
		case "$(sed -ne 's/^# EXT-TYPE=//p' <"$extension" | xargs echo)" in
		replace)
			argv1="$("$extension" "$argv1")"
			;;
		mime)
			argv1="$("$extension" "$argv1")"
			;;
		esac
	done

	# these commands may fail; this is intentional
	if [ "$MIME" = "text/html" ]; then
		"$BROWSER" "$argv1"
	elif ! handlr launch "$MIME" -- "$argv1"; then
		printf "%s: %s: handlr(1) failed: " "$argv0" "$argv1" 1>&2
		[ "$(command -v handlr)" = "false" ] \
			&& printf "'handlr' program not found\n" 1>&2 \
			|| printf "non-zero exit status\n" 1>&2
	fi

	shift
done

exit 0