feat(html): added identify operations

src/MfGames.Nitride.Html/IdentifyHtml.cs

@@ -0,0 +1,78 @@
+using System;
+using System.Collections.Generic;
+using System.Threading;
+
+using FluentValidation;
+
+using MfGames.Gallium;
+using MfGames.Nitride.Contents;
+using MfGames.Nitride.Generators;
+
+using Zio;
+
+namespace MfGames.Nitride.Html;
+
+/// <summary>
+/// An operation that identifies Markdown files by their common extensions
+/// and converts them to text input while also adding the IsMarkdown
+/// component to identify them.
+/// </summary>
+[WithProperties]
+public partial class IdentifyHtml : IOperation
+{
+    private readonly IValidator<IdentifyHtml> validator;
+
+    public IdentifyHtml(IValidator<IdentifyHtml> validator)
+    {
+        this.validator = validator;
+    }
+
+    public Func<Entity, UPath, bool> IsHtmlTest { get; set; } = null!;
+
+    /// <inheritdoc />
+    public IEnumerable<Entity> Run(
+        IEnumerable<Entity> input,
+        CancellationToken cancellationToken = default)
+    {
+        this.validator.ValidateAndThrow(this);
+
+        return input.SelectEntity<UPath, ITextContent>(this.MarkTextEntities)
+            .SelectEntity<UPath, IBinaryContent>(this.MarkBinaryEntities);
+    }
+
+    private Entity MarkBinaryEntities(
+        Entity entity,
+        UPath path,
+        IBinaryContent binary)
+    {
+        // If we aren't a Markdown file, then there is nothing we can do about that.
+        if (!this.IsHtmlTest(entity, path))
+        {
+            return entity;
+        }
+
+        // Convert the file as a binary.
+        if (binary is ITextContentConvertable textConvertable)
+        {
+            entity = entity.SetTextContent(textConvertable.ToTextContent())
+                .SetIsHtml();
+        }
+        else
+        {
+            throw new InvalidOperationException(
+                "Cannot convert a binary content to a text without ITextContentConvertable.");
+        }
+
+        return entity;
+    }
+
+    private Entity MarkTextEntities(
+        Entity entity,
+        UPath path,
+        ITextContent _)
+    {
+        return this.IsHtmlTest(entity, path)
+            ? entity.SetIsHtml()
+            : entity;
+    }
+}

src/MfGames.Nitride.Html/IdentifyHtmlFromPath.cs

@@ -0,0 +1,29 @@
+using FluentValidation;
+
+using MfGames.Gallium;
+
+using Zio;
+
+namespace MfGames.Nitride.Html;
+
+public class IdentifyHtmlFromPath : IdentifyHtml
+{
+    public IdentifyHtmlFromPath(IValidator<IdentifyHtml> validator)
+        : base(validator)
+    {
+        this.IsHtmlTest = DefaultIsHtml;
+    }
+
+    private static bool DefaultIsHtml(
+        Entity entity,
+        UPath path)
+    {
+        return (path.GetExtensionWithDot() ?? string.Empty).ToLowerInvariant()
+            switch
+            {
+                ".htm" => true,
+                ".html" => true,
+                _ => false,
+            };
+    }
+}

src/MfGames.Nitride.Html/Validators/IdentifyHtmlValidator.cs

@@ -0,0 +1,12 @@
+using FluentValidation;
+
+namespace MfGames.Nitride.Html.Validators;
+
+public class IdentifyHtmlValidator : AbstractValidator<IdentifyHtml>
+{
+    public IdentifyHtmlValidator()
+    {
+        this.RuleFor(x => x.IsHtmlTest)
+            .NotNull();
+    }
+}

src/MfGames.Nitride.Markdown/IdentifyMarkdown.cs

@@ -71,16 +71,8 @@ public partial class IdentifyMarkdown : IOperation
         UPath path,
         ITextContent _)
     {
-        // If we aren't a Markdown file, then there is nothing
-        // we can do about that.
-        if (!this.IsMarkdownTest(entity, path))
-        {
-            return entity;
-        }
-
-        // We are already text, so just mark it as Markdown.
-        entity = entity.Set(IsMarkdown.Instance);
-
-        return entity;
+        return this.IsMarkdownTest(entity, path)
+            ? entity.SetIsMarkdown()
+            : entity;
     }
 }

src/MfGames.Nitride.Markdown/Validators/ConvertMarkdownToBaseValidator.cs

@@ -1,6 +1,6 @@
 using FluentValidation;
 
-namespace MfGames.Nitride.Markdown;
+namespace MfGames.Nitride.Markdown.Validators;
 
 public class ConvertMarkdownToBaseValidator
     : AbstractValidator<ConvertMarkdownToBase>

src/MfGames.Nitride.Markdown/Validators/IdentifyMarkdownValidator.cs

@@ -1,6 +1,6 @@
 using FluentValidation;
 
-namespace MfGames.Nitride.Markdown;
+namespace MfGames.Nitride.Markdown.Validators;
 
 public class IdentifyMarkdownValidator : AbstractValidator<IdentifyMarkdown>
 {