Added SimpleConfig class to deal with simple config options added for fallback to other gui when missing deps

lib/__init__.py

@@ -1,3 +1,4 @@
 from wallet import Wallet, format_satoshis, prompt_password
 from interface import WalletSynchronizer
 from interface import TcpStratumInterface
+from simple_config import SimpleConfig

lib/simple_config.py

@@ -0,0 +1,40 @@
+import json
+import os
+
+class SimpleConfig:
+  default_options = {"gui": "lite"}
+
+  def save_config(self):
+    f = open(self.config_file_path(), "w+")
+    f.write(json.dumps(self.config))
+
+  def load_config(self):
+    f = open(self.config_file_path(), "r")
+    file_contents = f.read()
+    if file_contents:
+      self.config = json.loads(file_contents)
+    else:
+      self.config = self.default_options
+      self.save_config()
+  
+  def config_file_path(self):
+    return "%s" % (self.config_folder + "/config.json")
+
+  def __init__(self):
+    # Find electrum data folder
+    if "HOME" in os.environ:
+      self.config_folder = os.path.join(os.environ["HOME"], ".electrum")
+    elif "LOCALAPPDATA" in os.environ:
+      self.config_folder = os.path.join(os.environ["LOCALAPPDATA"], "Electrum")
+    elif "APPDATA" in os.environ:
+      self.config_folder = os.path.join(os.environ["APPDATA"], "Electrum")
+    else:
+      raise BaseException("No home directory found in environment variables.")
+
+    # Read the file
+    if os.path.exists(self.config_file_path()):
+      self.load_config()
+    else:
+      self.config = self.default_options
+      self.save_config()
+