Implement --change-time flag (#1452)

* Implement --change-time flag
* Remove todo from --change-time bdd folder journal tests
* Add warning when --change-time used with no matching entries
* Add a test to make sure running --change-time with nothing prints a warning and doesn't change anything
* Add prompt for --change-time
* Don't prompt for --change-time when used with --edit and only one entry
* When using --edit and --change-time, change the time before editing
* Add test for --change-time used with --edit
* Modify failing --change-time test to conform to text in develop branch

jrnl/Journal.py

@@ -261,23 +261,29 @@ class Journal:
         for entry in entries_to_delete:
             self.entries.remove(entry)
 
-    def prompt_delete_entries(self):
-        """Prompts for deletion of each of the entries in a journal.
-        Returns the entries the user wishes to delete."""
+    def change_date_entries(self, date):
+        """Changes entry dates to given date."""
+        date = time.parse(date)
 
-        to_delete = []
+        for entry in self.entries:
+            entry.date = date
 
-        def ask_delete(entry):
+    def prompt_action_entries(self, message):
+        """Prompts for action for each entry in a journal, using given message.
+        Returns the entries the user wishes to apply the action on."""
+        to_act = []
+
+        def ask_action(entry):
             return yesno(
-                f"Delete entry '{entry.pprint(short=True)}'?",
+                f"{message} '{entry.pprint(short=True)}'?",
                 default=False,
             )
 
         for entry in self.entries:
-            if ask_delete(entry):
-                to_delete.append(entry)
+            if ask_action(entry):
+                to_act.append(entry)
 
-        return to_delete
+        return to_act
 
     def new_entry(self, raw, date=None, sort=True):
         """Constructs a new entry from some raw text input.