Restructure the src directory

It is split into
- /libgnucash (for the non-gui bits)
- /gnucash (for the gui)
- /common (misc source files used by both)
- /bindings (currently only holds python bindings)

This is the first step in restructuring the code. It will need much
more fine tuning later on.

bindings/python/example_scripts/simple_invoice_insert.py

@@ -0,0 +1,120 @@
+#!/usr/bin/env python
+
+# simple_invoice_insert.py -- Add an invoice to a set of books
+#
+# Copyright (C) 2010 ParIT Worker Co-operative <transparency@parit.ca>
+# 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 2 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, contact:
+# Free Software Foundation           Voice:  +1-617-542-5942
+# 51 Franklin Street, Fifth Floor    Fax:    +1-617-542-2652
+# Boston, MA  02110-1301,  USA       gnu@gnu.org
+#
+# @author Mark Jenkins, ParIT Worker Co-operative <mark@parit.ca>
+
+# Opens a GnuCash book file and adds an invoice to it for a particular
+# customer (by ID) with a specific ID and value 
+# Optionally also adds a payment for the invoice as well
+#
+# The account tree and tax tables are assumed to be the same as the ones
+# created in simple_business_create.py, but you can edit that to adapt
+# this to become an invoice importer for your own books
+#
+# Syntax:
+# gnucash-env python simple_invoice_insert.py \
+#          /home/blah/blah.gnucash
+#          dda2ec8e3e63c7715097f852851d6b22 1001 'The Goods' 201.43
+#
+# argv[1] should be the path to an existing gnucash file/database
+# for a file, simply pass the pathname, for a database you can use
+# these forms:
+# mysql://user:password@host/dbname
+# postgres://user:password@host[:port]/dbname (the port is optional)
+#
+
+##  @file
+#   @brief Add an invoice to a set of books
+#   @author Mark Jenkins, ParIT Worker Co-operative <mark@parit.ca>
+#   @ingroup python_bindings_examples
+
+from gnucash import Session, GUID, GncNumeric
+from gnucash.gnucash_business import Customer, Invoice, Entry
+from gnucash.gnucash_core_c import string_to_guid
+from os.path import abspath
+from sys import argv
+from decimal import Decimal
+import datetime
+
+def gnc_numeric_from_decimal(decimal_value):
+    sign, digits, exponent = decimal_value.as_tuple()
+
+    # convert decimal digits to a fractional numerator
+    # equivlent to
+    # numerator = int(''.join(digits))
+    # but without the wated conversion to string and back,
+    # this is probably the same algorithm int() uses
+    numerator = 0
+    TEN = int(Decimal(0).radix()) # this is always 10
+    numerator_place_value = 1
+    # add each digit to the final value multiplied by the place value
+    # from least significant to most sigificant
+    for i in xrange(len(digits)-1,-1,-1):
+        numerator += digits[i] * numerator_place_value
+        numerator_place_value *= TEN
+
+    if decimal_value.is_signed():
+        numerator = -numerator
+
+    # if the exponent is negative, we use it to set the denominator
+    if exponent < 0 :
+        denominator = TEN ** (-exponent)
+    # if the exponent isn't negative, we bump up the numerator
+    # and set the denominator to 1
+    else:
+        numerator *= TEN ** exponent
+        denominator = 1
+
+    return GncNumeric(numerator, denominator)
+
+
+s = Session(argv[1], is_new=False)
+
+book = s.book
+root = book.get_root_account()
+commod_table = book.get_table()
+CAD = commod_table.lookup('CURRENCY', 'CAD')
+
+my_customer = book.CustomerLookupByID(argv[2])
+assert( my_customer != None )
+assert( isinstance(my_customer, Customer) )
+
+assets = root.lookup_by_name("Assets")
+receivables = assets.lookup_by_name("Receivables")
+income = root.lookup_by_name("Income")
+
+invoice = Invoice(book, argv[3], CAD, my_customer )
+description = argv[4]
+invoice_value = gnc_numeric_from_decimal(Decimal(argv[5]))
+tax_table = book.TaxTableLookupByName('good tax')
+invoice_entry = Entry(book, invoice)
+invoice_entry.SetInvTaxTable(tax_table)
+invoice_entry.SetInvTaxIncluded(False)
+invoice_entry.SetDescription(description)
+invoice_entry.SetQuantity( GncNumeric(1) )
+invoice_entry.SetInvAccount(income)
+invoice_entry.SetInvPrice(invoice_value)
+
+invoice.PostToAccount(receivables, datetime.date.today(), datetime.date.today(),
+                      "", True, False)
+
+s.save()
+s.end()