Re-implement changes in the previous commit

DiscordChatExporter.Cli/Commands/Base/ExportCommandBase.cs

@@ -7,6 +7,7 @@ using System.Threading.Tasks;
 using CliFx.Attributes;
 using CliFx.Exceptions;
 using CliFx.Infrastructure;
+using DiscordChatExporter.Cli.Commands.Converters;
 using DiscordChatExporter.Cli.Utils.Extensions;
 using DiscordChatExporter.Core.Discord;
 using DiscordChatExporter.Core.Discord.Data;
@@ -120,7 +121,9 @@ public abstract class ExportCommandBase : DiscordCommandBase
 
     [CommandOption(
         "fuck-russia",
-        Description = "Don't print the Support Ukraine message to the console."
+        EnvironmentVariable = "FUCK_RUSSIA",
+        Description = "Don't print the Support Ukraine message to the console.",
+        Converter = typeof(TruthyBooleanBindingConverter)
     )]
     public bool IsUkraineSupportMessageDisabled { get; init; }
 

DiscordChatExporter.Cli/Commands/Converters/TruthyBooleanBindingConverter.cs

@@ -0,0 +1,26 @@
+using System;
+using System.Globalization;
+using CliFx.Extensibility;
+
+namespace DiscordChatExporter.Cli.Commands.Converters;
+
+internal class TruthyBooleanBindingConverter : BindingConverter<bool>
+{
+    public override bool Convert(string? rawValue)
+    {
+        // Null is still considered true, to match the base behavior
+        if (rawValue is null)
+            return true;
+
+        if (string.IsNullOrWhiteSpace(rawValue))
+            return false;
+
+        if (bool.TryParse(rawValue, out var boolValue))
+            return boolValue;
+
+        if (int.TryParse(rawValue, CultureInfo.InvariantCulture, out var intValue) && intValue == 0)
+            return false;
+
+        return true;
+    }
+}