Validates the user typing and prepares sequel #5

- adds index range
- adds quit option
- makes code compliant with pylint & flake8

cli.py

@@ -8,46 +8,85 @@ Licence: `GNU GPL v3` GNU GPL v3: http://www.gnu.org/licenses/
 
     Command line interface to interact with local DB
 
-Choose a product in the list of aivaiable categories, the system gives you an
+Choose a product in a list of aivaiable CATEGORIES, the system gives you an
 alternative with a better 'nutriscore'.
 You can save this product to get it later.
 
  """
 from os import system
 from db import Db
-from config import DB_REQUEST, CLI_MSG_DISCLAIMER, CLI_MSG_ASK_CAT
+from config import DB_REQUEST, CLI_MSG_DISCLAIMER, CLI_MSG_ASK_CAT, \
+    CLI_MSG_ASK_ERR, CLI_MSG_QUIT, CLI_MSG_CHOOSEN_CAT
+
+valid_category = False
+cli_msg = str()
 
 # Starts a DB connection
-local_db = Db()
-# print(local_db.message)
+LOCAL_DB = Db()
+# print(LOCAL_DB.message)
 
 # Gets category list
-local_db.execute(DB_REQUEST['list_cat'])
+LOCAL_DB.execute(DB_REQUEST['list_cat'])
+IDX_MAX = int(LOCAL_DB.cursor.rowcount - 1)
+CATEGORIES = [(idx, val['name'], val['COUNT(*)'])
+              for idx, val in enumerate(LOCAL_DB.result)]
 
-# Hacky result split for rendering in 2 columns
-results_1 = [(idx, val['name'], val['COUNT(*)']) for idx, val in enumerate(local_db.result) if idx%2 != 0]
-results_2 = [(idx, val['name'], val['COUNT(*)']) for idx, val in enumerate(local_db.result) if idx%2 == 0]
+# Hacky results-split for rendering in 2 columns
+RES_EVEN = [(idx, val['name'], val['COUNT(*)'])
+            for idx, val in enumerate(LOCAL_DB.result) if idx % 2 == 0]
+RES_UNEVEN = [(idx, val['name'], val['COUNT(*)'])
+              for idx, val in enumerate(LOCAL_DB.result) if idx % 2 != 0]
 
-cli_msg = str()
-for num, row in enumerate(results_1):
-    cli_msg += "{} : {} \t\t {} : {}\n".format(
-        results_2[num][0],
-        results_2[num][1],
-        row[0],
-        row[1]
+# category list
+CLI_MSG_LIST = ""
+for num, row in enumerate(RES_UNEVEN):
+    CLI_MSG_LIST += "{} : {} \t\t {} : {}\n".format(
+        RES_EVEN[num][0],
+        RES_EVEN[num][1],
+        RES_UNEVEN[num][0],
+        RES_UNEVEN[num][1]
     )
 
+if len(RES_UNEVEN) < len(RES_EVEN):
+    num += 1
+    CLI_MSG_LIST += "{} : {}\n".format(
+        RES_EVEN[num][0],
+        RES_EVEN[num][1]
+    )
 
 # Prompts it with an index
-system('clear')
-print(CLI_MSG_DISCLAIMER)
-print(cli_msg)
-
 # Asks the user to enter the index of the selected category
-input(CLI_MSG_ASK_CAT)
+while valid_category is False:
+    system('clear')
+    print(CLI_MSG_DISCLAIMER)
+    print(CLI_MSG_LIST)
+    print(cli_msg)
 
+    response = input(CLI_MSG_ASK_CAT.format(IDX_MAX))
 
-    # If index is not valid, re-ask
+    if response.lower() == "q":
+        valid_category = True
+        cli_msg = CLI_MSG_QUIT
+
+    else:
+        try:
+            response = int(response)
+
+        # Response not int(), re-ask
+        except ValueError:
+            cli_msg += CLI_MSG_ASK_ERR.format(response)
+            # pass
+
+        else:
+            # Response is valid
+            if response <= IDX_MAX:
+                valid_category = True
+                category = CATEGORIES[response]
+                cli_msg = CLI_MSG_CHOOSEN_CAT.format(category[1])
+
+            # Response not in range, re-ask
+            else:
+                cli_msg += CLI_MSG_ASK_ERR.format(response)
 
 # Lists all products
 
@@ -58,3 +97,5 @@ input(CLI_MSG_ASK_CAT)
 # Shows the 1st product in the same category with the lowest nutriscore
 
 # Saves if user choose it
+
+print(cli_msg)

config.py

@@ -32,10 +32,16 @@ DB_REQUEST = {
     'get_better': "SELECT p.name, p.nutrition_grades FROM product AS p LEFT JOIN category AS c ON p.category_id = c.id WHERE c.name = '{}' AND p.nutrition_grades < '{}'",
     'save_substitute': "UPDATE product SET substitute_id={} WHERE id={}",
 }
-CLI_MSG_DISCLAIMER = "# # # Bienvenu sur le terminal # # #\n"\
-"Voici la liste des catégories disponines : \n"
 
-CLI_MSG_ASK_CAT = "Saisissez le nombre de la catégorie choisie : "
+CLI_MSG_DISCLAIMER = "# # # Bienvenu sur le terminal # # #\n"\
+    "Voici la liste des catégories disponibles : \n"
+
+CLI_MSG_ASK_CAT = "Saisissez le nombre de la catégorie choisie [0-{}]"\
+    "\n(«Q» pour quitter): "
+
+CLI_MSG_ASK_ERR = "\nSaisie incorrecte : «{}»"
+CLI_MSG_QUIT = "\nAu revoir!"
+CLI_MSG_CHOOSEN_CAT = "\n= = = = =[ {} ]= = = ="
 
 
 # DATABASE