#!/bin/sh
#
# Copyright (c) 2014, 2016
#       Tama Communications Corporation
#
# This file is part of GNU GLOBAL.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# 
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# htags-server: private Web/CGI server using python or ruby
#
name=htags-server
#
# HTTP/CGI servers
#
python2_server() {
	"$1" <<!
import SocketServer,BaseHTTPServer,CGIHTTPServer
import sys

host = '$2'
port = $3
retry = $retry
limit = port + retry
while True:
	try:
		http = BaseHTTPServer.HTTPServer((host, port), CGIHTTPServer.CGIHTTPRequestHandler)
	except SocketServer.socket.error as e:
		in_use = 'port ' + str(port) + ' already in use';
		if e.args[0] == 48:
			if retry == 0:
				sys.exit('Error: ' + in_use + '.')
			print('Warning: ' + in_use + '(skipped)')
			port += 1
			if port > limit:
				sys.exit('Error: gave up.')
		else:
			sys.exit('Error: SocketServer.socket failed. errono = ' + str(e.args[0]))
	else:
		break
url = 'http://' + host + ':' + str(port)
print('Please access at ' + url)
print('Python2 http/cgi server')
print('Serving HTTP on ' + host + ' port ' + str(port) + ' ...')
http.serve_forever()
!
}
python3_server() {
	"$1" <<!
import http.server
import socketserver
import sys

host = '$2'
port = $3
retry = $retry
limit = port + retry
while True:
	try:
		http = http.server.HTTPServer((host, port), http.server.CGIHTTPRequestHandler)
	except socketserver.socket.error as e:
		in_use = 'port ' + str(port) + ' already in use';
		if e.args[0] == 48:
			if retry == 0:
				sys.exit('Error: ' + in_use + '.')
			print('Warning: ' + in_use + '(skipped)')
			port += 1
			if port > limit:
				sys.exit('Error: gave up')
		else:
			sys.exit('Error: socketserver.socket failed. errono = ' + str(e.args[0]))
	else:
		break
url = 'http://' + host + ':' + str(port)
print('Please access at ' + url)
print('Python3 http/cgi server')
http.serve_forever()
!
}
ruby_server() {
	"$1" <<!
require 'webrick'
include WEBrick

host = '$2'
port = $3
retry_count = $retry
limit = port + retry_count
already_inuse = Regexp.new('^Address already in use')
begin
	http = HTTPServer.new(
		:DocumentRoot => './',
		:BindAddress => host,
		:Port => port
	)
rescue => e
	if already_inuse =~ e.message
		if retry_count == 0
			puts 'Error: port ' + port.to_s + ' already in use.'
			exit(1)
		end
		puts 'Warning: port ' + port.to_s + ' already in use (skipped)'
		port += 1
		if port > limit
			puts 'Error: gave up'
			exit(1)
		end
		retry 
	end
end
url = 'http://' + host + ':' + port.to_s
puts 'Please access at ' + url
puts 'Ruby WEBrick http/cgi server'
puts 'Serving HTTP on ' + host + ' port ' + port.to_s + ' ...'
trap("INT") {
	http.shutdown
	puts 'Interrupted!'
	exit(1)
}
http.start
!
}
#
# Utilities
#
find_command() {
	for d in `echo "$PATH" | sed -e 's/^:/.:/' -e 's/:$/:./' \
		-e 's/::/:.:/' -e 's/:/ /g'`
	do
		if [ -x "$d/$1" ]; then
			echo "$d/$1"
			break
		fi
	done
}
#
# sanity check
#
if [ ! -d HTML ]; then
	echo "Please invoke this command at the project root directory."
	exit 1
fi
if ! cd HTML; then
	echo "Cannot change directory."
	exit 1
fi
if ! [ -f index.html -a -f help.html -a -d files -a -d defines ]; then
	echo "It seems that this hyper-text is broken."
	exit 1
fi
#
# Parse arguments
#
bind=127.0.0.1
port=8000
retry=0
use=
while [ $# -gt 0 ]; do
	case $1 in
	-b|--bind)	shift; bind=$1;;
	-u|--use)	shift; use=$1;;
	--retry=*)	retry=`echo $1 | sed 's/--retry=//'`;;
	--retry)	retry=20;;
	--use=*)	use=`echo $1 | sed 's/--use=//'`;;
	--bind=*)	bind=`echo $1 | sed 's/--bind=//'`;;
	--help|-*)
		echo "usage: $name [-b|--bind ip][-u use][--retry[=n]][port]"; exit 0;;
	*)
		port=$1;;
	esac
	shift
done
case $use in
''|python|ruby)
	;;
*)	echo "Invalid language name '$use'."; exit 1;;
esac
case $port in
[0-9]|[0-9][0-9]|[0-9][0-9][0-9]|[0-9][0-9][0-9][0-9]|[0-9][0-9][0-9][0-9][0-9])
	;;
*)	echo "Invalid port number '$port'."; exit 1;;
esac
#
# Main procedure
#
if [ "$use" != 'ruby' ]; then
	com=`find_command python`
	if [ "$com" != '' ]; then
		case `$com --version 2>&1` in
		*'command not found')
			echo "$com not found."; exit 1;;
		Python' '2.*)
			python2_server $com $bind $port; exit 0;;
		Python' '3.*)
			python3_server $com $bind $port; exit 0;;
		*)
			echo "This version of python is not supported."; exit 1;;
		esac
	fi
fi
if [ "$use" != 'python' ]; then
	com=`find_command ruby`
	if [ "$com" != '' ]; then
		case `$com --version 2>&1` in
		*'command not found')
			echo "$com not found."; exit 1;;
		ruby' '1.[0-7]*)
			echo "This version of ruby is not supported."; exit 1;;
		*)
			ruby_server $com $bind $port; exit 0;;
		esac
	fi
fi
echo "Suitable Python or Ruby not found."
exit 1
