cpython/Demo/cwilib/cwilib.py

# Interface to the interactive CWI library catalog.

import sys
import stdwin
from stdwinevents import *
import select
import telnetlib
import vt100win
from form import Form


# Main program

def main():
	vt = vt100win.VT100win()
	#
	host = 'biefstuk.cwi.nl'
	port = 0
	timeout = 10.0
	tn = telnetlib.Telnet(host, port)
	tn.set_timeout(timeout)
	#
	try:
		vt.send(tn.read_until('login: '))
		tn.write('cwilib\r')
		#
		vt.send(tn.read_until('Hit <RETURN> to continue...'))
		tn.write('\r')
		#
		vt.send(tn.read_until('QUIT'))
	except EOFError:
		sys.stderr.write('Connection closed prematurely\n')
		sys.exit(1)
	#
	define_screens(vt)
	matches = vt.which_screens()
	if 'menu' not in matches:
		sys.stderr.write('No main menu within %g seconds\n' % timeout)
		sys.exit(1)
	#
	tn.set_timeout(0)
	tn.write('\r\r')
	vt.open('Progress -- CWI Library')
	ui = UserInterface()
	#
	while 1:
		event = stdwin.pollevent()
		if not event:
			rfd, wfd, xfd = select.select([stdwin, tn], [], [])
			if stdwin in rfd:
				event = stdwin.getevent()
		if event:
			type, window, detail = event
			if window == None and type == WE_LOST_SEL:
				window = ui.queryform.window
				event = type, window, detail
			if type == WE_CLOSE:
				break
			if window in ui.windows:
				ui.dispatch(type, window, detail)
			elif window == vt.window:
				if type == WE_NULL:
					pass
				elif type == WE_COMMAND:
					if detail == WC_RETURN:
						tn.write('\r')
					elif detail == WC_BACKSPACE:
						tn.write('\b')
					elif detail == WC_TAB:
						tn.write('\t')
					elif detail == WC_UP:
						tn.write('\033[A')
					elif detail == WC_DOWN:
						tn.write('\033[B')
					elif detail == WC_RIGHT:
						tn.write('\033[C')
					elif detail == WC_LEFT:
						tn.write('\033[D')
					else:
						print '*** Command:', detail
				elif type == WE_CHAR:
					tn.write(detail)
				elif type == WE_DRAW:
					vt.draw(detail)
				elif type in (WE_ACTIVATE, WE_DEACTIVATE):
					pass
				else:
					print '*** VT100 event:', type, detail
			else:
				print '*** Alien event:', type, window, detail
		elif tn in rfd:
			vt.window.setwincursor('watch')
			try:
				data = tn.read_now()
			except EOFError:
				stdwin.message('Connection closed--goodbye')
				break
			print 'send...'
			vt.send(data)
			print 'send...done'
			vt.window.setwincursor('arrow')
			matches = vt.which_screens()
			if 'timelimit' in matches:
				stdwin.message('Time limit--goodbye')
				break
			print '*** Matches:', matches
		else:
			print '*** Weird return from select:', rfd, wfd, xfd


# Subroutine to define our screen recognition patterns

def define_screens(vt):
	vt.define_screen('menu', {
		  'title': ('search', 0, 0, 80,
		            ' SEARCH FUNCTIONS  +OTHER FUNCTIONS '),
		  })
	vt.define_screen('search', {
		  'title': ('search', 0, 0, 80, ' Search '),
		  })
	vt.define_screen('shortlist', {'title': ('search', 0, 0, 80,
		  ' Short-list')})
	vt.define_screen('showrecord', {
		  'title': ('search', 0, 0, 80, ' Show record '),
		  })
	vt.define_screen('timelimit', {
		  'limit': ('search', 12, 0, 80, ' TIME LIMIT '),
		  })
	vt.define_screen('attention', {
		  'BASE': ('copy', 0, 0, 0, 'search'),
		  'title': ('search', 10, 0, 80, ' ATTENTION ')})
	vt.define_screen('syntaxerror', {
		  'BASE': ('copy', 0, 0, 0, 'attention'),
		  'message': ('search', 12, 0, 80, ' Syntax error'),
		  })
	vt.define_screen('emptyerror', {
		  'BASE': ('copy', 0, 0, 0, 'attention'),
		  'message': ('search', 12, 0, 80,
		              ' Check your input. Search at least one term'),
		  })
	vt.define_screen('unsortedwarning', {
		  'BASE': ('copy', 0, 0, 0, 'attention'),
		  'message': ('search', 12, 0, 80,
		              ' Number of records exceeds sort limit'),
		  })
	vt.define_screen('thereismore', {
		  'BASE': ('copy', 0, 0, 0, 'showrecord'),
		  'message': ('search', 15, 0, 80,
		     'There is more within this record. Use the arrow keys'),
		  })
	vt.define_screen('nofurther', {
		  'BASE': ('copy', 0, 0, 0, 'showrecord'),
		  'message': ('search', 17, 0, 80, 'You cannot go further\.'),
		  })
	vt.define_screen('nofurtherback', {
		  'BASE': ('copy', 0, 0, 0, 'showrecord'),
		  'message': ('search', 17, 0, 80,
		              'You cannot go further back'),
		  })


# Class to implement our user interface.

class UserInterface:

	def __init__(self):
		stdwin.setfont('7x14')
		self.queryform = QueryForm()
		self.listform = ListForm()
		self.recordform = RecordForm()
		self.forms = [self.queryform, self.listform, self.recordform]
		define_query_fields(self.queryform)
		self.windows = []
		for form in self.forms:
			if form.formheight > 0:
				form.open()
				self.windows.append(form.window)

	def __del__(self):
		self.close()

	def close(self):
		for form in self.forms:
			form.close()

	def dispatch(self, type, window, detail):
		for form in self.forms:
			if window == form.window:
				form.dispatch(type, detail)


def define_query_fields(f):
	f.define_field('name', 'Name auth./ed.', 1, 60)
	f.define_field('title',  'Title', 4, 60)
	f.define_field('shelfmark', 'Shelf mark', 1, 60)
	f.define_field('class', 'Prim. classif.', 1, 60)
	f.define_field('series', 'Series', 1, 60)
	f.define_field('congress', 'Congr. pl./year', 1, 60)
	f.define_field('type', 'Type', 1, 60)


class QueryForm(Form):

	def __init__(self):
		Form.__init__(self, 'Query form -- CWI Library')

	def dispatch(self, type, detail):
		if type == WE_COMMAND and detail == WC_RETURN:
			print '*** SUBMIT ***'
		else:
			Form.dispatch(self, type, detail)


class ListForm(Form):

	def __init__(self):
		Form.__init__(self, 'Short list -- CWI Library')


class RecordForm(Form):

	def __init__(self):
		Form.__init__(self, 'Record detail -- CWI Library')


main()