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dibbler/text_based.py

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Python
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#!/usr/bin/python
import sqlalchemy
import re
import sys
from helpers import *
exit_commands = ['exit', 'abort', 'quit', 'bye', 'eat flaming death']
help_commands = ['help', '?']
context_commands = ['what', '??']
local_help_commands = ['help!', '???']
class ExitMenu(Exception):
pass
class Menu():
def __init__(self, name, items=[], prompt='> ',
return_index=True,
exit_msg=None, exit_confirm_msg=None, exit_disallowed_msg=None,
help_text=None):
self.name = name
self.items = items
self.prompt = prompt
self.return_index = return_index
self.exit_msg = exit_msg
self.exit_confirm_msg = exit_confirm_msg
self.exit_disallowed_msg = exit_disallowed_msg
self.help_text = help_text
self.context = None
self.header_format = '[%s]'
def exit_menu(self):
if self.exit_disallowed_msg != None:
print self.exit_disallowed_msg
return
if self.exit_confirm_msg != None:
if not confirm(self.exit_confirm_msg):
return
raise ExitMenu()
def at_exit(self):
if self.exit_msg:
print self.exit_msg
def set_context(self, string, display=True):
self.context = string
if self.context != None and display:
print self.context
def printc(self, string):
print string
if self.context == None:
self.context = string
else:
self.context += '\n' + string
def show_context(self):
print self.header_format % self.name
if self.context != None:
print self.context
def item_is_submenu(self, i):
return isinstance(self.items[i], Menu)
def item_name(self, i):
if self.item_is_submenu(i):
return self.items[i].name
elif isinstance(self.items[i], tuple):
return self.items[i][1]
else:
return str(self.items[i])
def item_value(self, i):
if isinstance(self.items[i], tuple):
return self.items[i][0]
if self.return_index:
return i
return self.items[i]
def input_str(self, prompt=None, regex=None, length_range=(None,None),
empty_string_is_none=False):
if regex != None:
while True:
result = self.input_str(prompt, length_range=length_range)
if re.match(regex+'$', result):
return result
else:
print 'Value must match regular expression "%s"' % regex
if length_range != (None,None):
while True:
result = self.input_str(prompt)
length = len(result)
if ((length_range[0] and length < length_range[0]) or
(length_range[1] and length > length_range[1])):
if length_range[0] and length_range[1]:
print 'Value must have length in range [%d,%d]' % length_range
elif allowed_range[0]:
print 'Value must have length at least %d' % length_range[0]
else:
print 'Value must have length at most %d' % length_range[1]
else:
return result
if prompt == None:
prompt = self.prompt
while True:
try:
result = raw_input(prompt)
except EOFError:
print 'quit'
self.exit_menu()
continue
if result in exit_commands:
self.exit_menu()
continue
if result in help_commands:
self.general_help()
continue
if result in local_help_commands:
self.local_help()
continue
if result in context_commands:
self.show_context()
continue
if empty_string_is_none and result == '':
return None
return result
def input_int(self, prompt=None, allowed_range=(None,None)):
if prompt == None:
prompt = self.prompt
while True:
result = self.input_str(prompt)
try:
value = int(result)
if ((allowed_range[0] and value < allowed_range[0]) or
(allowed_range[1] and value > allowed_range[1])):
if allowed_range[0] and allowed_range[1]:
print 'Value must be in range [%d,%d]' % allowed_range
elif allowed_range[0]:
print 'Value must be at least %d' % allowed_range[0]
else:
print 'Value must be at most %d' % allowed_range[1]
else:
return value
except ValueError:
print 'Please enter an integer'
def input_user(self, prompt=None):
user = None
while user == None:
user = retrieve_user(self.input_str(prompt),
self.session)
return user
def input_product(self, prompt=None):
product = None
while product == None:
product = retrieve_product(self.input_str(prompt),
self.session)
return product
def input_thing(self, prompt=None, permitted_things=('user','product'),
empty_input_permitted=False):
result = None
while result == None:
search_str = self.input_str(prompt)
if search_str == '' and empty_input_permitted:
return None
result = self.search_for_thing(search_str, permitted_things)
return result
def search_for_thing(self, search_str, permitted_things=('user','product')):
search_fun = {'user': search_user,
'product': search_product}
results = {}
result_values = {}
for thing in permitted_things:
results[thing] = search_fun[thing](search_str, self.session)
result_values[thing] = self.search_result_value(results[thing])
selected_thing = argmax(result_values)
return search_ui2(search_str, results[selected_thing],
selected_thing, self.session)
def search_result_value(self, result):
if result == None:
return 0
if not isinstance(result, list):
return 3
if len(result) == 0:
return 0
if len(result) == 1:
return 2
return 1
def print_header(self):
print
print self.header_format % self.name
def pause(self):
self.input_str('.')
def general_help(self):
print '''
DIBBLER HELP
The following commands are recognized (almost) everywhere:
help, ? -- display this help
what, ?? -- redisplay the current context
help!, ??? -- display context-specific help (if any)
exit, quit, etc. -- exit from the current menu
When prompted for a user, you can type (parts of) the user name or
card number. When prompted for a product, you can type (parts of) the
product name or barcode.
'''
def local_help(self):
if self.help_text == None:
print 'no help here'
else:
print
print 'Help for %s:' % (self.header_format%self.name)
print self.help_text
def execute(self):
try:
return self._execute()
except ExitMenu:
self.at_exit()
return None
def _execute(self):
while True:
self.print_header()
self.set_context(None)
if len(self.items)==0:
self.printc('(empty menu)')
self.pause()
return None
for i in range(len(self.items)):
self.printc('%d ) %s' % (i+1, self.item_name(i)))
item_i = self.input_int(self.prompt, (1,len(self.items)))-1
if self.item_is_submenu(item_i):
self.items[item_i].execute()
else:
return self.item_value(item_i)
class Selector(Menu):
def __init__(self, name, items=[], prompt='select> ',
return_index=True,
exit_msg=None, exit_confirm_msg=None,
help_text=None):
Menu.__init__(self, name, items, prompt, return_index, exit_msg)
self.header_format = '%s'
def print_header(self):
print self.header_format % self.name
def local_help(self):
if self.help_text == None:
print 'This is a selection menu. Enter one of the listed numbers, or'
print '\'exit\' to go out and do something else.'
else:
print
print 'Help for selector (%s):' % self.name
print self.help_text
# class ChargeMenu(Menu):
# def __init__(self):
# self.name = "Add credits to a user account"
# def execute(self):
# self.session = Session()
# amount = self.input_int('Amount to be added> ')
# user = self.input_user('To user>')
# t = Transaction(user, -amount, 'Add '+str(amount)+' to user '+user.name)
# t.perform_transaction()
# self.session.add(t)
# self.session.commit()
# print 'Added %d kr to user %s\'s account' % (amount, user.name)
# print 'User %s\'s credit is now %d kr' % (user,user.credit)
# self.session.close()
# self.pause()
class TransferMenu(Menu):
def __init__(self):
Menu.__init__(self, 'Transfer credit between users')
def _execute(self):
self.print_header()
self.session = Session()
amount = self.input_int('Transfer amount> ', (-100000,100000))
user1 = self.input_user('From user> ')
user2 = self.input_user('To user> ')
t1 = Transaction(user1, amount,
'transfer to '+user2.name)
t2 = Transaction(user2, -amount,
'transfer from '+user1.name)
t1.perform_transaction()
t2.perform_transaction()
self.session.add(t1)
self.session.add(t2)
try:
self.session.commit()
print 'Transfered %d kr from %s to %s' % (amount, user1, user2)
print 'User %s\'s credit is now %d kr' % (user1, user1.credit)
print 'User %s\'s credit is now %d kr' % (user2, user2.credit)
except sqlalchemy.exc.SQLAlchemyError, e:
print 'Could not perform transfer: %s' % e
self.session.close()
self.pause()
class AddUserMenu(Menu):
def __init__(self):
Menu.__init__(self, 'Add user')
def _execute(self):
self.print_header()
self.session = Session()
username = self.input_str('User name> ', User.name_re, (1,10))
cardnum = self.input_str('Card number> ', User.card_re, (0,10))
user = User(username, cardnum)
self.session.add(user)
try:
self.session.commit()
print 'User %s stored' % username
except sqlalchemy.exc.IntegrityError, e:
print 'Could not store user %s: %s' % (username,e)
self.session.close()
self.pause()
class EditUserMenu(Menu):
def __init__(self):
Menu.__init__(self, 'Edit user')
def _execute(self):
self.print_header()
self.session = Session()
user = self.input_user('User> ')
self.printc('Editing user %s' % user.name)
user.card = self.input_str('Card number (currently "%s")> ' % user.card,
User.card_re, (0,10),
empty_string_is_none=True)
try:
self.session.commit()
print 'User %s stored' % user.name
except sqlalchemy.exc.SQLAlchemyError, e:
print 'Could not store user %s: %s' % (user.name,e)
self.session.close()
self.pause()
class AddProductMenu(Menu):
def __init__(self):
Menu.__init__(self, 'Add product')
def _execute(self):
self.session = Session()
self.print_header()
bar_code = self.input_str('Bar code> ', Product.bar_code_re, (8,13))
name = self.input_str('Name> ', Product.name_re, (1,30))
price = self.input_int('Price> ', (1,100000))
product = Product(bar_code, name, price)
self.session.add(product)
try:
self.session.commit()
print 'Product %s stored' % name
except sqlalchemy.exc.SQLAlchemyError, e:
print 'Could not store product %s: %s' % (name,e)
self.session.close()
self.pause()
class EditProductMenu(Menu):
def __init__(self):
Menu.__init__(self, 'Edit product')
def _execute(self):
self.print_header()
self.session = Session()
product = self.input_product('Product> ')
self.printc('Editing product %s' % product.name)
while True:
selector = Selector('Do what with %s?' % product.name,
items=[('name', 'Edit name'),
('price', 'Edit price (currently %d)' % product.price),
('store', 'Store')])
what = selector.execute()
if what == 'name':
product.name = self.input_str('Name> ', Product.name_re, (1,30))
elif what == 'price':
product.price = self.input_int('Price> ', (1,100000))
elif what == 'store':
try:
self.session.commit()
print 'Product %s stored' % product.name
except sqlalchemy.exc.SQLAlchemyError, e:
print 'Could not store product %s: %s' % (product.name, e)
self.session.close()
self.pause()
return
class ShowUserMenu(Menu):
def __init__(self):
Menu.__init__(self, 'Show user')
def _execute(self):
self.session = Session()
self.print_header()
user = self.input_user('User name or card number> ')
print 'User name: %s' % user.name
print 'Card number: %s' % user.card
print 'Credit: %s kr' % user.credit
self.print_transactions(user)
self.pause()
def print_transactions(self, user):
limit = 10
num_trans = len(user.transactions)
if num_trans == 0:
print 'No transactions'
return
if num_trans <= limit:
print 'Transactions (%d):' % num_trans
else:
print 'Transactions (%d, showing only last %d):' % (num_trans,limit)
for t in user.transactions[-limit:]:
string = ' * %s: %s %d kr, ' % \
(t.time.strftime('%Y-%m-%d %H:%M'),
{True:'in', False:'out'}[t.amount<0],
abs(t.amount))
if t.purchase:
string += 'purchase ('
string += ', '.join(map(lambda e: e.product.name,
t.purchase.entries))
string += ')'
else:
string += t.description
print string
class BuyMenu(Menu):
def __init__(self):
Menu.__init__(self, 'Buy')
self.help_text = '''
Each purchase may contain one or more products and one or more buyers.
Enter products (by name or bar code) and buyers (by name or bar code)
in any order. The information gathered so far is displayed after each
addition, and you can type 'what' at any time to redisplay it.
When finished, write an empty line to confirm the purchase.
'''
def _execute(self):
self.print_header()
self.session = Session()
self.purchase = Purchase()
while True:
self.print_purchase()
self.printc({(False,False): 'Enter user or product identification',
(False,True): 'Enter user identification or more products',
(True,False): 'Enter product identification or more users',
(True,True): 'Enter more products or users, or an empty line to confirm'
}[(len(self.purchase.transactions) > 0,
len(self.purchase.entries) > 0)])
thing = self.input_thing(empty_input_permitted=True)
if thing == None:
if not self.complete_input():
if confirm('Not enough information entered. Abort purchase? (y/n) '):
return False
continue
break
if isinstance(thing, User):
Transaction(thing, purchase=self.purchase)
elif isinstance(thing, Product):
PurchaseEntry(self.purchase, thing, 1)
self.purchase.perform_purchase()
self.session.add(self.purchase)
try:
self.session.commit()
except sqlalchemy.exc.SQLAlchemyError, e:
print 'Could not store purchase: %s' % e
else:
print 'Purchase stored.'
self.print_purchase()
for t in self.purchase.transactions:
print 'User %s\'s credit is now %d kr' % (t.user.name, t.user.credit)
self.session.close()
self.pause()
return True
def complete_input(self):
return self.purchase.is_complete()
def format_purchase(self):
self.purchase.set_price()
transactions = self.purchase.transactions
entries = self.purchase.entries
if len(transactions) == 0 and len(entries) == 0:
return None
string = 'Purchase:'
string += '\n buyers: '
if len(transactions) == 0:
string += '(empty)'
else:
string += ', '.join(map(lambda t: t.user.name, transactions))
string += '\n products: '
if len(entries) == 0:
string += '(empty)'
else:
string += ', '.join(map(lambda e: '%s (%d kr)'%(e.product.name, e.product.price),
entries))
if len(transactions) > 1:
string += '\n price per person: %d kr' % self.purchase.price_per_transaction()
string += '\n total price: %d kr' % self.purchase.price
return string
def print_purchase(self):
info = self.format_purchase()
if info != None:
self.set_context(info)
class AdjustCreditMenu(Menu): # reimplements ChargeMenu; these should be combined to one
def __init__(self):
Menu.__init__(self, 'Adjust credit')
def _execute(self):
self.print_header()
self.session = Session()
user = self.input_user('User> ')
print 'User %s\'s credit is %d kr' % (user.name, user.credit)
self.set_context('Adjusting credit for user %s' % user.name, display=False)
amount = self.input_int('Add amount> ', (-100000,100000))
description = self.input_str('Log message> ', length_range=(0,50))
if description == '':
description = 'manually adjusted credit'
transaction = Transaction(user, -amount, description)
transaction.perform_transaction()
self.session.add(transaction)
try:
self.session.commit()
print 'User %s\'s credit is now %d kr' % (user.name, user.credit)
except sqlalchemy.exc.SQLAlchemyError, e:
print 'Could not store transaction: %s' % e
self.session.close()
self.pause()
class ProductListMenu(Menu):
def __init__(self):
Menu.__init__(self, 'Product list')
def _execute(self):
self.print_header()
session = Session()
product_list = session.query(Product).all()
line_format = '%-30s | %6s | %-15s'
print line_format % ('name', 'price', 'bar code')
print '---------------------------------------------------------'
for p in product_list:
print line_format % (p.name, p.price, p.bar_code)
self.pause()
def dwim_search(string, session):
typ = guess_data_type(string)
if typ == None:
print 'This does not make sense'
return
retriever = {'card': retrieve_user,
'username': retrieve_user,
'bar_code': retrieve_product,
'product_name': retrieve_product}
value_type = {'card': 'user',
'username': 'user',
'bar_code': 'product',
'product_name': 'product'}
value = retriever[typ](string, session)
# if value == None:
# print 'Input "%s" interpreted as %s; no matching %s found.' \
# % (string, typ, value_type[typ])
return (value_type[typ], value)
def search_ui(search_fun, search_str, thing, session):
result = search_fun(search_str, session)
return search_ui2(search_str, result, thing, session)
def search_ui2(search_str, result, thing, session):
if not isinstance(result, list):
return result
if len(result) == 0:
print 'No %ss matching "%s"' % (thing, search_str)
return None
if len(result) == 1:
msg = 'One %s matching "%s": %s. Use this? (y/n) ' %\
(thing, search_str, result[0])
if confirm(msg):
return result[0]
return None
limit = 9
if len(result) > limit:
select_header = '%d %ss matching "%s"; showing first %d' % \
(len(result), thing, search_str, limit)
select_items = result[:limit]
else:
select_header = '%d %ss matching "%s"' % \
(len(result), thing, search_str)
select_items = result
selector = Selector(select_header, items=select_items,
return_index=False)
return selector.execute()
def retrieve_user(search_str, session):
return search_ui(search_user, search_str, 'user', session)
def retrieve_product(search_str, session):
return search_ui(search_product, search_str, 'product', session)
#main = MainMenu()
main = Menu('Dibbler main menu',
items=[BuyMenu(), ProductListMenu(), ShowUserMenu(),
AdjustCreditMenu(), TransferMenu(),
Menu('Add/edit',
items=[AddUserMenu(), EditUserMenu(),
AddProductMenu(), EditProductMenu()])
],
exit_msg='happy happy joy joy',
exit_confirm_msg='Really quit Dibbler? (y/n) ')
if not conf.quit_allowed:
main.exit_disallowed_msg = 'You can check out any time you like, but you can never leave.'
while True:
try:
main.execute()
except KeyboardInterrupt:
print
print 'Interrupted.'
except:
print 'Something went wrong.'
print '%s: %s' % sys.exc_info()[0:1]
else:
break
print 'Restarting main menu.'
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