chore: Move all the system type extensions/polyfills together

Author: bradwilson

src/Hyphen.Sdk/Extensions/HyphenSdkColorExtensions.cs

@@ -0,0 +1,85 @@
+using System.Drawing;
+using System.Globalization;
+using Hyphen.Sdk;
+
+namespace System;
+
+internal static class HyphenSdkPolyfills
+{
+	extension(Color color)
+	{
+		public string ToCss()
+		{
+			var result = "#"
+				+ ToHexChar(color.R >> 4) + ToHexChar(color.R & 0xF)
+				+ ToHexChar(color.G >> 4) + ToHexChar(color.G & 0xF)
+				+ ToHexChar(color.B >> 4) + ToHexChar(color.B & 0xF);
+
+			if (color.A != 255)
+				result = result + ToHexChar(color.A >> 4) + ToHexChar(color.A & 0xF);
+
+			return result;
+		}
+	}
+
+	extension(DateTimeOffset dateTimeOffset)
+	{
+		public string ToISO8601() =>
+			dateTimeOffset.ToString(@"yyyy-MM-ddTHH\:mm\:ss.fff\Z", CultureInfo.InvariantCulture);
+	}
+
+	extension(File)
+	{
+#if NETSTANDARD
+		public static Task WriteAllBytesAsync(string path, byte[] bytes, CancellationToken cancellationToken)
+		{
+			cancellationToken.ThrowIfCancellationRequested();
+			File.WriteAllBytes(path, bytes);
+			return Task.CompletedTask;
+		}
+#endif
+	}
+
+	extension(HttpClient client)
+	{
+		public void SetHyphenApiKey(string apiKey) =>
+			client.DefaultRequestHeaders.Add("x-api-key", apiKey);
+	}
+
+	extension(QrCodeSize size)
+	{
+		public string ToFormString() =>
+			size switch
+			{
+				QrCodeSize.Small => "small",
+				QrCodeSize.Medium => "medium",
+				QrCodeSize.Large => "large",
+				_ => throw new ArgumentException("Unknown QrCodeSize value: " + size.ToString()),
+			};
+	}
+
+	extension(string str)
+	{
+#if NETSTANDARD
+		public bool EndsWith(char value) => str.Length != 0 && str[str.Length - 1] == value;
+#endif
+
+		public string ReplaceInvariant(string oldValue, string newValue)
+#if NETSTANDARD
+			=> str.Replace(oldValue, newValue);
+#else
+			=> str.Replace(oldValue, newValue, StringComparison.InvariantCulture);
+#endif
+
+#if NETSTANDARD
+		public bool StartsWith(char value) => str.Length != 0 && str[0] == value;
+#endif
+	}
+
+	extension(string? str)
+	{
+		public string Quoted => str is null ? "null" : $@"""{str}""";
+	}
+
+	static char ToHexChar(int b) => (char)(b < 10 ? b + '0' : b - 10 + 'a');
+}

src/Hyphen.Sdk/Extensions/HyphenSdkDateTimeOffsetExtensions.cs

@@ -26,7 +26,7 @@ public static string Env_InvalidValue(string name, string? value) =>
 				env_InvalidValueComposite,
 #endif
 				name,
-				value.Quoted()
+				value.Quoted
 			);
 
 		public static string Env_InvalidValueType(string name, string typeName, string? value) =>
@@ -39,7 +39,7 @@ public static string Env_InvalidValueType(string name, string typeName, string?
 #endif
 				name,
 				typeName,
-				value.Quoted()
+				value.Quoted
 			);
 
 		public static string Http_StatusCodeError(HttpStatusCode statusCode) =>

src/Hyphen.Sdk/Extensions/HyphenSdkEnumExtensions.cs

@@ -218,7 +218,7 @@ void ParseEnvFile(string path)
 		if (required)
 			throw new ArgumentException(HyphenSdkResources.Env_InvalidValueType(name, typeName, value), nameof(name));
 
-		Logger.LogWarning(HyphenSdkResources.Env_InvalidValueTypeFmt, name, typeName, value.Quoted());
+		Logger.LogWarning(HyphenSdkResources.Env_InvalidValueTypeFmt, name, typeName, value.Quoted);
 		return null;
 	}
 

src/Hyphen.Sdk/Extensions/HyphenSdkHttpClientExtensions.cs

@@ -1,4 +1,3 @@
-using System.Drawing;
 using System.Net;
 using System.Net.Http.Headers;
 using System.Net.Http.Json;

src/Hyphen.Sdk/Extensions/HyphenSdkPolyfills.cs

@@ -75,14 +75,6 @@ public Task SaveQrCode(string fileName) =>
 	/// The QR code images are in PNG format, so it is recommended that the file name end with <c>".png"</c>.
 	/// </remarks>
 	[ExcludeFromCodeCoverage]  // Not testing due to file I/O (and simple implementation)
-	public Task SaveQrCode(string fileName, CancellationToken cancellationToken)
-	{
-#if NETSTANDARD
-		cancellationToken.ThrowIfCancellationRequested();
-		File.WriteAllBytes(fileName, GetQrCodeBytes());
-		return Task.CompletedTask;
-#else
-		return File.WriteAllBytesAsync(fileName, GetQrCodeBytes(), cancellationToken);
-#endif
-	}
+	public Task SaveQrCode(string fileName, CancellationToken cancellationToken) =>
+		File.WriteAllBytesAsync(fileName, GetQrCodeBytes(), cancellationToken);
 }