Include heading level overried for deployment applicability

docs/source/markup/applies.md

@@ -45,4 +45,16 @@ applies:
   serverless: beta
 ```
 
-Are equivalent, note `all` just means we won't be rendering the version portion in the html.
+Are equivalent, note `all` just means we won't be rendering the version portion in the html.
+
+
+## This section has its own applies annotations
+```{applies}
+:stack: unavailable
+:serverless: tech-preview
+```
+
+This section describes a feature that's unavailable in `stack` and in tech preview on `serverless`
+
+
+the `{applies}` directive **MUST** be preceded by a heading.

src/Elastic.Markdown/Myst/Directives/AppliesBlock.cs

@@ -0,0 +1,68 @@
+// Licensed to Elasticsearch B.V under one or more agreements.
+// Elasticsearch B.V licenses this file to you under the Apache 2.0 License.
+// See the LICENSE file in the project root for more information
+
+using Elastic.Markdown.Myst.FrontMatter;
+using Markdig.Syntax;
+
+namespace Elastic.Markdown.Myst.Directives;
+
+public class AppliesBlock(DirectiveBlockParser parser, Dictionary<string, string> properties)
+	: DirectiveBlock(parser, properties)
+{
+	public override string Directive => "mermaid";
+
+	public Deployment? Deployment { get; private set; }
+
+	public override void FinalizeAndValidate(ParserContext context)
+	{
+		if (TryGetAvailability("stack", out var version))
+		{
+			Deployment ??= new Deployment();
+			Deployment.SelfManaged ??= new SelfManagedDeployment();
+			Deployment.SelfManaged.Stack = version;
+		}
+		if (TryGetAvailability("ece", out version))
+		{
+			Deployment ??= new Deployment();
+			Deployment.SelfManaged ??= new SelfManagedDeployment();
+			Deployment.SelfManaged.Ece = version;
+		}
+		if (TryGetAvailability("eck", out version))
+		{
+			Deployment ??= new Deployment();
+			Deployment.SelfManaged ??= new SelfManagedDeployment();
+			Deployment.SelfManaged.Eck = version;
+		}
+		if (TryGetAvailability("hosted", out version))
+		{
+			Deployment ??= new Deployment();
+			Deployment.Cloud ??= new CloudManagedDeployment();
+			Deployment.Cloud.Hosted = version;
+		}
+		if (TryGetAvailability("serverless", out version))
+		{
+			Deployment ??= new Deployment();
+			Deployment.Cloud ??= new CloudManagedDeployment();
+			Deployment.Cloud.Serverless = version;
+		}
+
+		if (Deployment is null)
+			EmitError(context, "{applies} block with no product availability specified");
+
+		var index = Parent?.IndexOf(this);
+		if (Parent is not null && index > 0)
+		{
+			var i = index - 1 ?? 0;
+			var prevSib = Parent[i];
+			if (prevSib is not HeadingBlock)
+				EmitError(context, "{applies} should follow a heading");
+		}
+
+		bool TryGetAvailability(string key, out ProductAvailability? semVersion)
+		{
+			semVersion = null;
+			return Prop(key) is {} v && ProductAvailability.TryParse(v, out semVersion);
+		}
+	}
+}

src/Elastic.Markdown/Myst/Directives/DirectiveBlockParser.cs

@@ -111,6 +111,9 @@ protected override DirectiveBlock CreateFencedBlock(BlockProcessor processor)
 	    if (info.IndexOf("{literalinclude}") > 0)
 			return new LiteralIncludeBlock(this, _admonitionData, context);
 
+	    if (info.IndexOf("{applies}") > 0)
+			return new AppliesBlock(this, _admonitionData);
+
 	    foreach (var admonition in _admonitions)
 	    {
 		    if (info.IndexOf($"{{{admonition}}}") > 0)

src/Elastic.Markdown/Myst/Directives/DirectiveHtmlRenderer.cs

@@ -5,6 +5,7 @@
 // This file is licensed under the BSD-Clause 2 license.
 // See the license.txt file in the project root for more information.
 
+using Elastic.Markdown.Myst.FrontMatter;
 using Elastic.Markdown.Myst.Substitution;
 using Elastic.Markdown.Slices;
 using Elastic.Markdown.Slices.Directives;
@@ -34,6 +35,9 @@ protected override void Write(HtmlRenderer renderer, DirectiveBlock directiveBlo
 			case MermaidBlock mermaidBlock:
 				WriteMermaid(renderer, mermaidBlock);
 				return;
+			case AppliesBlock appliesBlock:
+				WriteApplies(renderer, appliesBlock);
+				return;
 			case FigureBlock imageBlock:
 				WriteFigure(renderer, imageBlock);
 				return;
@@ -179,6 +183,15 @@ private void WriteMermaid(HtmlRenderer renderer, MermaidBlock block)
 		RenderRazorSliceRawContent(slice, renderer, block);
 	}
 
+	private void WriteApplies(HtmlRenderer renderer, AppliesBlock block)
+	{
+		if (block.Deployment is null || block.Deployment == Deployment.All)
+			return;
+
+		var slice = Applies.Create(block.Deployment);
+		RenderRazorSliceNoContent(slice, renderer);
+	}
+
 	private void WriteTabItem(HtmlRenderer renderer, TabItemBlock block)
 	{
 		var slice = TabItem.Create(new TabItemViewModel
@@ -240,6 +253,12 @@ private static void RenderRazorSlice<T>(RazorSlice<T> slice, HtmlRenderer render
 		renderer.Write(blocks[1]);
 	}
 
+	private static void RenderRazorSliceNoContent<T>(RazorSlice<T> slice, HtmlRenderer renderer)
+	{
+		var html = slice.RenderAsync().GetAwaiter().GetResult();
+		renderer.Write(html);
+	}
+
 	private static void RenderRazorSliceRawContent<T>(RazorSlice<T> slice, HtmlRenderer renderer, DirectiveBlock obj)
 	{
 		var html = slice.RenderAsync().GetAwaiter().GetResult();

src/Elastic.Markdown/Myst/FrontMatter/Deployment.cs

@@ -79,35 +79,34 @@ public class DeploymentConverter : IYamlTypeConverter
 			return null;
 
 		var deployment = new Deployment();
-
-		if (TryGetVersion("stack", out var version))
+		if (TryGetAvailability("stack", out var version))
 		{
 			deployment.SelfManaged ??= new SelfManagedDeployment();
 			deployment.SelfManaged.Stack = version;
 		}
-		if (TryGetVersion("ece", out version))
+		if (TryGetAvailability("ece", out version))
 		{
 			deployment.SelfManaged ??= new SelfManagedDeployment();
 			deployment.SelfManaged.Ece = version;
 		}
-		if (TryGetVersion("eck", out version))
+		if (TryGetAvailability("eck", out version))
 		{
 			deployment.SelfManaged ??= new SelfManagedDeployment();
 			deployment.SelfManaged.Eck = version;
 		}
-		if (TryGetVersion("hosted", out version))
+		if (TryGetAvailability("hosted", out version))
 		{
 			deployment.Cloud ??= new CloudManagedDeployment();
 			deployment.Cloud.Hosted = version;
 		}
-		if (TryGetVersion("serverless", out version))
+		if (TryGetAvailability("serverless", out version))
 		{
 			deployment.Cloud ??= new CloudManagedDeployment();
 			deployment.Cloud.Serverless = version;
 		}
 		return deployment;
 
-		bool TryGetVersion(string key, out ProductAvailability? semVersion)
+		bool TryGetAvailability(string key, out ProductAvailability? semVersion)
 		{
 			semVersion = null;
 			return dictionary.TryGetValue(key, out var v) && ProductAvailability.TryParse(v, out semVersion);

src/Elastic.Markdown/_static/custom.css

@@ -47,6 +47,9 @@ h1 {
 }
 .product-availability {
 	padding-bottom: 0.8em;
+}
+
+h1 + .product-availability {
 	border-bottom: 1px solid #dfdfdf;
 }
 
@@ -56,6 +59,12 @@ h1:has(+ .product-availability) {
 	border-bottom: none;
 }
 
+section:has(+ .product-availability) h2 {
+	margin-bottom: 0.0em;
+	padding-bottom: 0;
+	border-bottom: none;
+}
+
 .applies-to-label {
 	font-size: 1em;
 	margin-top: 0.4em;

tests/Elastic.Markdown.Tests/Directives/AppliesBlockTests.cs

@@ -0,0 +1,78 @@
+// Licensed to Elasticsearch B.V under one or more agreements.
+// Elasticsearch B.V licenses this file to you under the Apache 2.0 License.
+// See the LICENSE file in the project root for more information
+
+using Elastic.Markdown.Diagnostics;
+using Elastic.Markdown.Myst.Directives;
+using FluentAssertions;
+using Xunit.Abstractions;
+
+namespace Elastic.Markdown.Tests.Directives;
+
+public class AppliesBlockTests(ITestOutputHelper output) : DirectiveTest<AppliesBlock>(output,
+"""
+# heading
+```{applies}
+:eck: unavailable
+```
+"""
+)
+{
+	[Fact]
+	public void ParsesBlock() => Block.Should().NotBeNull();
+
+	[Fact]
+	public void IncludesProductAvailability() =>
+		Html.Should().Contain("Unavailable</span>")
+			.And.Contain("Elastic Cloud Kubernetes")
+			.And.Contain("Applies To:");
+
+
+	[Fact]
+	public void NoErrors() => Collector.Diagnostics.Should().BeEmpty();
+}
+
+public class EmptyAppliesBlock(ITestOutputHelper output) : DirectiveTest<AppliesBlock>(output,
+"""
+```{applies}
+```
+"""
+)
+{
+	[Fact]
+	public void ParsesBlock() => Block.Should().NotBeNull();
+
+	[Fact]
+	public void DoesNotRender() =>
+		Html.Should().BeNullOrWhiteSpace();
+
+	[Fact]
+	public void EmitErrorOnEmptyBlock()
+	{
+		Collector.Diagnostics.Should().NotBeNullOrEmpty().And.HaveCount(2);
+		Collector.Diagnostics.Should().OnlyContain(d => d.Severity == Severity.Error);
+		Collector.Diagnostics.Should()
+			.Contain(d => d.Message.Contains("{applies} block with no product availability specified"));
+
+		Collector.Diagnostics.Should()
+			.Contain(d => d.Message.Contains("{applies} should follow a heading"));
+	}
+}
+
+// ensures we allow for empty lines between heading and applies block
+public class AppliesHeadingTests(ITestOutputHelper output) : DirectiveTest<AppliesBlock>(output,
+"""
+# heading
+
+
+
+```{applies}
+:eck: unavailable
+```
+"""
+)
+{
+	[Fact]
+	public void NoErrors() => Collector.Diagnostics.Should().BeEmpty();
+}
+