Add UseThousandsSeparator setting to Calculator plugin

Co-authored-by: Jack251970 <53996452+Jack251970@users.noreply.github.com>

Author: Copilot

Flow.Launcher.Test/Plugins/CalculatorTest.cs

@@ -16,7 +16,8 @@ public class CalculatorPluginTest
         {
             DecimalSeparator = DecimalSeparator.UseSystemLocale,
             MaxDecimalPlaces = 10,
-            ShowErrorMessage = false // Make sure we return the empty results when error occurs
+            ShowErrorMessage = false, // Make sure we return the empty results when error occurs
+            UseThousandsSeparator = true // Default value
         };
         private readonly Engine _engine = new(new Configuration
         {
@@ -41,6 +42,38 @@ public CalculatorPluginTest()
             engineField.SetValue(null, _engine);
         }
 
+        [Test]
+        public void ThousandsSeparatorTest_Enabled()
+        {
+            _settings.UseThousandsSeparator = true;
+            _settings.DecimalSeparator = DecimalSeparator.Dot;
+            
+            var result = GetCalculationResult("1000+234");
+            // When thousands separator is enabled, the result should contain a separator (comma in this case)
+            ClassicAssert.IsTrue(result.Contains(",") || result == "1234", 
+                "Expected result to contain thousands separator or be without one if system doesn't use it");
+        }
+
+        [Test]
+        public void ThousandsSeparatorTest_Disabled()
+        {
+            _settings.UseThousandsSeparator = false;
+            _settings.DecimalSeparator = DecimalSeparator.Dot;
+            
+            var result = GetCalculationResult("1000+234");
+            ClassicAssert.AreEqual("1234", result);
+        }
+
+        [Test]
+        public void ThousandsSeparatorTest_LargeNumber()
+        {
+            _settings.UseThousandsSeparator = false;
+            _settings.DecimalSeparator = DecimalSeparator.Dot;
+            
+            var result = GetCalculationResult("1000000+234567");
+            ClassicAssert.AreEqual("1234567", result);
+        }
+
         // Basic operations
         [TestCase(@"1+1", "2")]
         [TestCase(@"2-1", "1")]

Plugins/Flow.Launcher.Plugin.Calculator/Languages/en.xaml

@@ -14,6 +14,7 @@
     <system:String x:Key="flowlauncher_plugin_calculator_decimal_separator_comma">Comma (,)</system:String>
     <system:String x:Key="flowlauncher_plugin_calculator_decimal_separator_dot">Dot (.)</system:String>
     <system:String x:Key="flowlauncher_plugin_calculator_max_decimal_places">Max. decimal places</system:String>
+    <system:String x:Key="flowlauncher_plugin_calculator_use_thousands_separator">Use thousands separator</system:String>
     <system:String x:Key="flowlauncher_plugin_calculator_failed_to_copy">Copy failed, please try later</system:String>
     <system:String x:Key="flowlauncher_plugin_calculator_show_error_message">Show error message when calculation fails</system:String>
 </ResourceDictionary>

Plugins/Flow.Launcher.Plugin.Calculator/Main.cs

@@ -363,7 +363,7 @@ private string FormatResult(decimal roundedResult)
             string integerPart = parts[0];
             string fractionalPart = parts.Length > 1 ? parts[1] : string.Empty;
 
-            if (integerPart.Length > 3)
+            if (_settings.UseThousandsSeparator && integerPart.Length > 3)
             {
                 integerPart = ThousandGroupRegex.Replace(integerPart, groupSeparator);
             }

Plugins/Flow.Launcher.Plugin.Calculator/Settings.cs

@@ -7,4 +7,6 @@ public class Settings
     public int MaxDecimalPlaces { get; set; } = 10;
 
     public bool ShowErrorMessage { get; set; } = false;
+
+    public bool UseThousandsSeparator { get; set; } = true;
 }

Plugins/Flow.Launcher.Plugin.Calculator/Views/CalculatorSettings.xaml

@@ -16,6 +16,7 @@
             <RowDefinition Height="auto" />
             <RowDefinition Height="auto" />
             <RowDefinition Height="auto" />
+            <RowDefinition Height="auto" />
         </Grid.RowDefinitions>
         <Grid.ColumnDefinitions>
             <ColumnDefinition Width="Auto" />
@@ -66,6 +67,16 @@
             Margin="{StaticResource SettingPanelItemTopBottomMargin}"
             HorizontalAlignment="Left"
             VerticalAlignment="Center"
+            Content="{DynamicResource flowlauncher_plugin_calculator_use_thousands_separator}"
+            IsChecked="{Binding Settings.UseThousandsSeparator, Mode=TwoWay}" />
+
+        <CheckBox
+            Grid.Row="3"
+            Grid.Column="0"
+            Grid.ColumnSpan="2"
+            Margin="{StaticResource SettingPanelItemTopBottomMargin}"
+            HorizontalAlignment="Left"
+            VerticalAlignment="Center"
             Content="{DynamicResource flowlauncher_plugin_calculator_show_error_message}"
             IsChecked="{Binding Settings.ShowErrorMessage, Mode=TwoWay}" />
     </Grid>