Add func based converter

src/Meziantou.Framework.HumanReadableSerializer/ConverterListExtensions.cs

@@ -0,0 +1,26 @@
+namespace Meziantou.Framework.HumanReadable;
+public static class ConverterListExtensions
+{
+    public static void Add<T>(this IList<HumanReadableConverter> converters, Func<T, string> convert)
+    {
+        converters.Add(new FuncConverter<T>((value, options) => convert(value)));
+    }
+
+    public static void Add<T>(this IList<HumanReadableConverter> converters, Func<T, HumanReadableSerializerOptions, string> convert)
+    {
+        converters.Add(new FuncConverter<T>(convert));
+    }
+
+    private sealed class FuncConverter<T> : HumanReadableConverter<T>
+    {
+        private readonly Func<T, HumanReadableSerializerOptions, string> _converter;
+
+        public FuncConverter(Func<T, HumanReadableSerializerOptions, string> converter) => _converter = converter;
+
+        protected override void WriteValue(HumanReadableTextWriter writer, T? value, HumanReadableSerializerOptions options)
+        {
+            var str = _converter(value, options);
+            writer.WriteValue(str);
+        }
+    }
+}

src/Meziantou.Framework.HumanReadableSerializer/Meziantou.Framework.HumanReadableSerializer.csproj

@@ -6,7 +6,7 @@
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <Description>One-way serializer to a human readable format</Description>
-    <Version>1.0.16</Version>
+    <Version>1.0.17</Version>
     <CompatibilityRange>true</CompatibilityRange>
   </PropertyGroup>
 

src/Meziantou.Framework.InlineSnapshotTesting/Meziantou.Framework.InlineSnapshotTesting.csproj

@@ -7,7 +7,7 @@
     <Description>Enables verification of objects using inline snapshots</Description>
     <DefineConstants Condition="'$(IsOfficialBuild)' != 'true'">$(DefineConstants);DEBUG_TaskDialogPrompt</DefineConstants>
 
-    <Version>1.0.25</Version>
+    <Version>1.0.26</Version>
     <NoWarn>$(NoWarn);NU5100</NoWarn>
 
     <!-- Buggy because of netstandard2.0 -->

tests/Meziantou.Framework.HumanReadableSerializer.Tests/SerializerTests.cs

@@ -930,7 +930,7 @@ public void SerializeObjectGraph()
 
     [Fact]
     public void Double() => AssertSerialization(-5.30d, "-5.3");
-    
+
     [Fact]
     public void Double_NaN() => AssertSerialization(double.NaN, "NaN");
 
@@ -1037,7 +1037,7 @@ public void StringWriter()
 
     [Fact]
     public void MethodInfo_dynamic_ValueTuple_Parameter() => AssertSerialization(typeof(Methods).GetMethod(nameof(Methods.ValueTupleDynamic)), "Meziantou.Framework.HumanReadable.Tests.SerializerTests+Methods.ValueTupleDynamic((dynamic, System.Int32) value)");
-    
+
     [Fact]
     public void MethodInfo_dynamic_Nested_ValueTuple_Parameter() => AssertSerialization(typeof(Methods).GetMethod(nameof(Methods.ValueTupleNestedDynamic)), "Meziantou.Framework.HumanReadable.Tests.SerializerTests+Methods.ValueTupleNestedDynamic((dynamic A, (System.Int32 B, dynamic C) D) value)");
 
@@ -2161,6 +2161,14 @@ public void IgnoreMemberWithType()
         });
     }
 
+    [Fact]
+    public void FuncConverter()
+    {
+        var options = new HumanReadableSerializerOptions();
+        options.Converters.Add<double>(value => value.ToString("G17", CultureInfo.InvariantCulture));
+        AssertSerialization(-5.30d, options, "-5.2999999999999998");
+    }
+
     private sealed class PropThrowAnException
     {
         public int A => throw new NotSupportedException();