adding markup extensions

src/AP.MobileToolkit.Fonts/Markup/CsharpMarkupExtensions.cs

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+using System;
+using AP.MobileToolkit.Fonts;
+using Xamarin.Forms;
+using Xamarin.Forms.Internals;
+using Xamarin.Forms.Xaml;
+
+namespace AP.MobileToolkit.Markup
+{
+    public static class CSharpMarkupExtensions
+    {
+        public static TElement SetIcon<TElement>(this TElement element, string icon, Color? color = null)
+            where TElement : Element, IFontElement
+        {
+            if (!FontRegistry.HasFont(icon, out var font))
+            {
+                return element;
+            }
+
+            var glyphColor = color ?? Color.Default;
+            var glyph = font.GetGlyph(icon);
+            switch (element)
+            {
+                case Label label:
+                    SetIcon(label, font.FontFileName, glyph, glyphColor);
+                    break;
+                case Span span:
+                    SetIcon(span, font.FontFileName, glyph, glyphColor);
+                    break;
+                case Editor editor:
+                    SetIcon(editor, font.FontFileName, glyph, glyphColor);
+                    break;
+                case Button button:
+                    SetIcon(button, font.FontFileName, glyph, glyphColor);
+                    break;
+                case SearchBar searchBar:
+                    SetIcon(searchBar, font.FontFileName, glyph, glyphColor);
+                    break;
+            }
+            return element;
+        }
+
+        public static FontImageSource SetIcon(this FontImageSource imageSource, string icon, Color? color = null)
+        {
+            if (FontRegistry.HasFont(icon, out var font))
+            {
+                imageSource.Glyph = font.GetGlyph(icon);
+                imageSource.FontFamily = font.FontFileName;
+                imageSource.Color = color ?? Color.Default;
+            }
+
+            return imageSource;
+        }
+
+        private static void SetIcon(Label element, string fontFamily, string glyph, Color color)
+        {
+            element.Text = glyph;
+            element.FontFamily = fontFamily;
+            element.TextColor = color;
+        }
+
+        private static void SetIcon(Span element, string fontFamily, string glyph, Color color)
+        {
+            element.Text = glyph;
+            element.FontFamily = fontFamily;
+            element.TextColor = color;
+        }
+
+        private static void SetIcon(Editor element, string fontFamily, string glyph, Color color)
+        {
+            element.Text = glyph;
+            element.FontFamily = fontFamily;
+            element.TextColor = color;
+        }
+
+        private static void SetIcon(Button element, string fontFamily, string glyph, Color color)
+        {
+            element.Text = glyph;
+            element.FontFamily = fontFamily;
+            element.TextColor = color;
+        }
+
+        private static void SetIcon(SearchBar element, string fontFamily, string glyph, Color color)
+        {
+            // TODO: We'll want to introduce an effect that adds the icon to the Search Bar rather than setting the text.
+            element.Text = glyph;
+            element.FontFamily = fontFamily;
+            element.TextColor = color;
+        }
+
+        private static void SetIcon(SearchHandler element, string fontFamily, string glyph, Color color)
+        {
+            element.QueryIcon = new FontImageSource
+            {
+                Glyph = glyph,
+                FontFamily = fontFamily,
+                Color = color
+            };
+        }
+
+        private class CsharpCodeHelper : IProvideValueTarget, IServiceProvider
+        {
+            public CsharpCodeHelper(object targetObject)
+            {
+                TargetObject = targetObject;
+            }
+
+            public object TargetObject { get; }
+
+            public object TargetProperty => null;
+
+            public object GetService(Type serviceType)
+            {
+                return this;
+            }
+        }
+    }
+}

tests/AP.MobileToolkit.Fonts.Tests/CsharpMarkupTests.cs

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+using System;
+using AP.MobileToolkit.Fonts.Tests.Mocks;
+using AP.MobileToolkit.Markup;
+using Xamarin.Forms;
+using Xunit;
+
+namespace AP.MobileToolkit.Fonts.Tests
+{
+    public class CsharpMarkupTests
+    {
+        public CsharpMarkupTests()
+        {
+            Xamarin.Forms.Mocks.MockForms.Init();
+            FontRegistry.Clear();
+            FontRegistry.RegisterFonts(SampleFontAwesomeRegular.Font, SampleFontAwesomeSolid.Font);
+        }
+
+        [Fact]
+        public void SetIconSetsTextAndFontFamilyOnLabel()
+        {
+            var label = new Label().SetIcon("far fa-calendar");
+
+            // "far fa-calendar", "\uf133"
+            Assert.Equal(SampleFontAwesomeRegular.FontFile, label.FontFamily);
+            Assert.Equal("\uf133", label.Text);
+        }
+
+        [Fact]
+        public void SetIconSetsTextAndFontFamilyOnSpan()
+        {
+            var label = new Span().SetIcon("far fa-calendar");
+
+            // "far fa-calendar", "\uf133"
+            Assert.Equal(SampleFontAwesomeRegular.FontFile, label.FontFamily);
+            Assert.Equal("\uf133", label.Text);
+        }
+
+        [Fact]
+        public void SetIconSetsTextAndFontFamilyOnEditor()
+        {
+            var label = new Editor().SetIcon("far fa-calendar");
+
+            // "far fa-calendar", "\uf133"
+            Assert.Equal(SampleFontAwesomeRegular.FontFile, label.FontFamily);
+            Assert.Equal("\uf133", label.Text);
+        }
+
+        [Fact]
+        public void SetIconSetsTextAndFontFamilyOnButton()
+        {
+            var label = new Button().SetIcon("far fa-calendar");
+
+            // "far fa-calendar", "\uf133"
+            Assert.Equal(SampleFontAwesomeRegular.FontFile, label.FontFamily);
+            Assert.Equal("\uf133", label.Text);
+        }
+
+        [Fact]
+        public void SetIconSetsTextAndFontFamilyOnSearchBar()
+        {
+            var label = new SearchBar().SetIcon("far fa-calendar");
+
+            // "far fa-calendar", "\uf133"
+            Assert.Equal(SampleFontAwesomeRegular.FontFile, label.FontFamily);
+            Assert.Equal("\uf133", label.Text);
+        }
+    }
+}