Added config backup and write operations

config.json

@@ -1,12 +1 @@
-{
-  "TITLE": "pyShelf E-Book Server",
-  "VERSION": "0.3.0",
-  "BOOKPATH": "books/",
-  "DB_HOST": "localhost",
-  "DB_PORT": "5432",
-  "DATABASE": "pyshelf",
-  "USER": "pyshelf",
-  "PASSWORD": "pyshelf",
-  "BOOKSHELF": "data/shelf.json",
-  "ALLOWED_HOSTS": "*"
-}
+{"TITLE": "pyShelf E-Book Server", "VERSION": "0.3.0", "BOOKPATH": "~/Books", "DB_HOST": "localhost", "DB_PORT": "5432", "DATABASE": "pyshelf", "USER": "pyshelf", "PASSWORD": "pyshelf", "BOOKSHELF": "data/shelf.json", "ALLOWED_HOSTS": "*"}

install

@@ -1,35 +1,44 @@
 #!/usr/bin/python3.8
 import json
 import pathlib
-from pprint import pprint
-# from src.backend.lib.config import Config # Use ptShelfs configuration class or stay independant for portability?
+import os
 from src.backend.lib.display import TerminalDisplay
 
-# PRG_PATH = pathlib.Path.cwd()
-# LIB_PATH = pathlib.Path.joinpath(PRG_PATH, "src", "backend", "lib")
-# sys.path.insert(0, PRG_PATH)
-
-# Call for the ui and installer questions.
-install_answers = TerminalDisplay().installer()
-
 
 class Configuration:
     def __init__(self):
         self._cp = pathlib.Path("config.json")
         self._data = self.open_file()
+        self.system = os.sys.environ
 
     def open_file(self):
-        with open(str(self._cp), "r") as read_file:
-            data = json.load(read_file)
-        return data
+        """
+        Try to open and then backup the configuration file.
+        Fail and return false if initial configuration is not found.
+        # TODO: More specific error handling 
+        """
+        try:
+            with open(str(self._cp), "r") as read_file:
+                data = json.load(read_file)
+            with open('config.backup.json', 'w') as backup_file:
+                json.dump(data, backup_file)
+            return data
+        except Exception as e:
+            print(e)
+            return False
 
     def write_file(self, data):
-        with open(str(self._cp), "rw") as write_file:
-            json.dumps(write_file)
+        """
+        Write the provided data to the new configuration file
+        """
+        with open(str(self._cp), "w") as write_file:
+            json.dump(data, write_file)
         return True
 
 
 config = Configuration().open_file()
-# Print a comparison between config.json and user inputs.
-pprint(install_answers)
-pprint(config)
+install_answers = TerminalDisplay().installer()
+for key in install_answers:
+    config[key["name"]] = key["answer"]
+Configuration().write_file(config)
+

src/backend/lib/display.py

@@ -1,9 +1,5 @@
 from __future__ import unicode_literals
-
 import os
-import sys
-from pprint import pprint
-
 from prompt_toolkit import prompt as prm
 
 
@@ -11,6 +7,8 @@ class TerminalDisplay:
     def __init__(self):
         self.term = True
         self.w, self.y = os.get_terminal_size()[0], os.get_terminal_size()[1]
+        self.home = os.environ["HOME"]
+        self.user = os.environ["USER"]
 
     def screen(self):
         return self.term
@@ -18,38 +16,42 @@ class TerminalDisplay:
     def installer(self):
         questions = [
             {
-                "message": "Input the absolute path to your ebooks\nEg. /home/{user}/Books > ",
+                "message": "Input the absolute path to your ebooks\nEnter for default \"~/Books\" > ",
                 "options": "",
                 "name": "BOOKPATH",
-                "answer": "",
+                "answer": None,
+                "default": self.home+"/Books"
             },
             {
-                "message": "Input your PostgreSQL server ip\nEg. localhost > ",
+                "message": "Input your PostgreSQL server ip\nEnter for default \"localhost\" > ",
                 "options": "localhost",
                 "name": "DB_HOST",
-                "answer": "",
+                "answer": None,
+                "default": "localhost"
             },
             {
-                "message": "Input your PostgreSQL server port\nEg. 5432 > ",
+                "message": "Input your PostgreSQL server port\nEnter for default \"5432\" > ",
                 "options": "5432",
                 "name": "DB_PORT",
-                "answer": "",
+                "answer": None,
+                "default": "5432"
             },
             {
-                "message": "Input your PostgreSQL user name\nEg. pyshelf > ",
+                "message": "Input your PostgreSQL user name\nEnter for default \"pyshelf\" > ",
                 "options": "pyshelf",
                 "name": "USER",
-                "answer": "",
+                "answer": None,
+                "default": "pyshelf"
             },
             {
-                "message": "Input your PostgreSQL password\neg. pyshelf > ",
+                "message": "Input your PostgreSQL password\nEnter for default \"pyshelf\" > ",
                 "options": "pyshelf",
                 "name": "PASSWORD",
-                "answer": "",
+                "answer": None,
+                "default": "pyshelf"
             },
         ]
-        answers = self.prompt(questions)
-        pprint(answers)
+        return self.prompt(questions)
 
     @staticmethod
     def clear():
@@ -61,6 +63,8 @@ class TerminalDisplay:
         for answer in answers:
             self.h_rule()
             answer["answer"] = prm(answer["message"])
+            if answer["answer"] == "":
+                answer["answer"] = answer["default"]
             self.clear()
         return answers