Add autocompletion for logins in the visit prompt

completer.py

@@ -0,0 +1,55 @@
+class LoginCompleter:
+    """ A loop-based completion system for logins """
+    def __init__(self, menu):
+        self.s = ""
+        self.logins = None
+        self.completions = []
+        # completion_id has a value of -1 for the base user input
+        # and between 0 and len(completions)-1 for completions
+        self.completion_id = -1
+        self.completion_base = ""
+        self.menu = menu
+
+    def initialize(self):
+        """ Initialise the list of completable logins """
+        garden = self.menu.user_data.retrieve_garden_from_db()
+        self.logins = set()
+        for plant_id in garden:
+            if not garden[plant_id]:
+                continue
+            entry = garden[plant_id]
+            if "owner" in entry:
+                self.logins.add(entry["owner"])
+        self.logins = sorted(list(self.logins))
+
+    def update_input(self, s):
+        """ Update the user input and reset completion base """
+        self.s = s
+        self.completion_base = self.s
+        self.completion_id = -1
+
+    def complete(self, direction = 1):
+        """
+        Returns the completed string from the user input
+        Loops forward in the list of logins if direction is positive, and
+        backwards if direction is negative
+        """
+        def loginFilter(x):
+            return x.startswith(self.s) & (x != self.s)
+
+        # Refresh possible completions after the user edits
+        if self.completion_id == -1:
+            if self.logins is None:
+                self.initialize()
+            self.completion_base = self.s
+            self.completions = list(filter(loginFilter, self.logins))
+
+        self.completion_id += direction
+        # Loop from the back
+        if self.completion_id == -2:
+            self.completion_id = len(self.completions) - 1
+        # If we are at the base input, return it
+        if self.completion_id == -1 or self.completion_id == len(self.completions):
+            self.completion_id = -1
+            return self.completion_base
+        return self.completions[self.completion_id]

menu_screen.py

@@ -10,6 +10,7 @@ import json
 import sqlite3
 import string
 import re
+import completer
 
 class CursedMenu(object):
     #TODO: name your plant
@@ -644,20 +645,30 @@ class CursedMenu(object):
             visitor_block = 'nobody :('
         return visitor_block
 
-    def get_user_string(self, xpos=3, ypos=15, filterfunc=str.isalnum):
+    def get_user_string(self, xpos=3, ypos=15, filterfunc=str.isalnum, completer=None):
         # filter allowed characters using filterfunc, alphanumeric by default
         user_string = ""
         user_input = 0
+        if completer:
+            completer = completer(self)
         while user_input != 10:
             user_input = self.screen.getch()
             # osx and unix backspace chars...
             if user_input == 127 or user_input == 263:
                 if len(user_string) > 0:
                     user_string = user_string[:-1]
+                    if completer:
+                        completer.update_input(user_string)
                     self.screen.addstr(ypos, xpos, " " * (self.maxx-xpos-1))
-            if user_input < 256 and user_input != 10:
+            elif user_input in [ord('\t'), curses.KEY_BTAB] and completer:
+                direction = 1 if user_input == ord('\t') else -1
+                user_string = completer.complete(direction)
+                self.screen.addstr(ypos, xpos, " " * (self.maxx-xpos-1))
+            elif user_input < 256 and user_input != 10:
                 if filterfunc(chr(user_input)):
                     user_string += chr(user_input)
+                    if completer:
+                        completer.update_input(user_string)
             self.screen.addstr(ypos, xpos, str(user_string))
             self.screen.refresh()
         return user_string
@@ -674,7 +685,7 @@ class CursedMenu(object):
         weekly_visitor_text = self.get_weekly_visitors()
         self.draw_info_text("this week you've been visited by: ", 6)
         self.draw_info_text(weekly_visitor_text, 7)
-        guest_garden = self.get_user_string()
+        guest_garden = self.get_user_string(completer = completer.LoginCompleter)
         if not guest_garden:
             self.clear_info_pane()
             return None