refactored purchase cycle's get item details and update item details functions and started with purchase price list

public/js/controllers/stock_controller.js

@@ -0,0 +1,32 @@
+// ERPNext - web based ERP (http://erpnext.com)
+// Copyright (C) 2012 Web Notes Technologies Pvt Ltd
+// 
+// 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/>.
+
+wn.provide("erpnext.stock");
+
+erpnext.stock.StockController = erpnext.utils.Controller.extend({
+	show_stock_ledger: function() {
+		var me = this;
+		this.frm.add_custom_button("Show Stock Ledger", function() {
+			var args = {
+				voucher_no: cur_frm.doc.name,
+				from_date: wn.datetime.str_to_user(cur_frm.doc.posting_date),
+				to_date: wn.datetime.str_to_user(cur_frm.doc.posting_date)
+			};	
+			wn.set_route('stock-ledger', 
+				$.map(args, function(val, key) { return key+"="+val; }).join("&&"));
+		}, "icon-bar-chart");
+	}
+});