feat(added command to retrieve stock overview):

grocy/commands/__init__.py

@@ -0,0 +1 @@
+from grocy.commands.stock import Stock 

grocy/commands/stock.py

@@ -0,0 +1,64 @@
+from grocy import RestService
+from tabulate import tabulate
+from os import path
+
+class Stock(object):
+    GET_CURRENT_STOCK = '/stock/get-current-stock'
+    GET_PRODUCT_BY_ID = '/get-object/products/{0}'
+    def __init__(self, **entries):
+        self.__dict__.update(entries)
+        self._init_rest_service()
+        #self._set_default_table_formats()
+        #if not hasattr('tablefmt', self):
+        #    self.tablefmt = None
+        #if not hasattr('colalign', self):
+        #    self.colalign = None
+
+        
+
+    def _set_default_table_formats(self):
+        if not hasattr('formats', self):
+            self.tablefmt = None
+            self.colalign = None
+        elif not hasattr('table', self.formats):
+                self.tableformat = None
+        elif not hasattr('col', self.formats):
+                self.colalign = None
+            
+
+
+    def _init_rest_service(self):
+        if self.api.startswith == '/':
+            self.api = self.api[1:]
+        if self.api.endswith == '/':
+            self.api = self.api[1:-1]
+        self.rest_service = RestService(self.api, json=True)
+        self.rest_service.addHeader('Content-Type', 'application/json')
+        self.rest_service.addToken(self.token)
+
+
+    def get_entries(self):
+        try:
+            get_current_stock = self.rest_service.get(Stock.GET_CURRENT_STOCK)
+
+            # Get product names from ids and replace 
+            product_ids = [entry['product_id'] for entry in get_current_stock]
+            table_entries = []
+            try:
+                for index in range(len(product_ids)):
+                    product_id = product_ids[index]
+                    path = Stock.GET_PRODUCT_BY_ID.format(product_id)
+                    product = self.rest_service.get(path)
+                    get_current_stock[index]['product_id'] = product['name']
+                    table_entry = list(dict.values(get_current_stock[index]))
+                    table_entries.append(table_entry)
+
+            except Exception as e:
+                raise e
+
+            # Generate stock overview table
+            table_headers = ['Product', 'Amount', 'Best Before Date', 'Amount Opened']
+            return tabulate(table_entries, headers=table_headers)
+            
+        except Exception as e:
+            raise e