Handle empty stack: applies_to output in HTML (#1456)

Author: Mpdreamz

docs/testing/req.md

@@ -29,6 +29,7 @@ Current version: **9.0.0**
 | `` {applies_to}`stack: removed 8.18` ``    | {applies_to}`stack: removed 8.18`    |
 | `` {applies_to}`stack: removed 9.0` ``     | {applies_to}`stack: removed 9.0`     |
 | `` {applies_to}`stack: removed 9.1` ``     | {applies_to}`stack: removed 9.1`     |
+| `` {applies_to}`stack: ` ``                | {applies_to}`stack: `                |
 
 {applies_to}`stack: deprecated 9.1, removed 9.4`
 

src/Elastic.Markdown/Myst/Components/ApplicableToComponent.cshtml

@@ -1,3 +1,4 @@
+@using System.Diagnostics.CodeAnalysis
 @using Elastic.Documentation
 @using Elastic.Markdown.Myst.FrontMatter
 @inherits RazorSlice<Elastic.Markdown.Myst.Components.ApplicableToViewModel>
@@ -94,7 +95,7 @@
 				switch (applicability.Lifecycle)
 				{
 					case ProductLifecycle.TechnicalPreview:
-						if (applicability.Version is not null && applicability.Version > currentStackVersion)
+						if (TryGetRealVersion(applicability, out var previewVersion) && previewVersion > currentStackVersion)
 						{
 							badgeText = "Planned";
 							tooltip = "We plan to add this functionality in a future update. Plans may change without notice.";
@@ -105,7 +106,7 @@
 						}
 						break;
 					case ProductLifecycle.Beta:
-						if (applicability.Version is not null && applicability.Version > currentStackVersion)
+						if (TryGetRealVersion(applicability, out var betaVersion) && betaVersion > currentStackVersion)
 						{
 							badgeText = "Planned";
 							tooltip = "We plan to add this functionality in a future update. Plans may change without notice.";
@@ -117,23 +118,23 @@
 
 						break;
 					case ProductLifecycle.GenerallyAvailable:
-						if (applicability.Version is not null && applicability.Version > currentStackVersion)
+						if (TryGetRealVersion(applicability, out var version) && version > currentStackVersion)
 						{
 							badgeText = "Planned";
 							tooltip = "We plan to add this functionality in a future update. Plans may change without notice.";
 						}
 
 						break;
 					case ProductLifecycle.Deprecated:
-						if (applicability.Version is not null && applicability.Version > currentStackVersion)
+						if (TryGetRealVersion(applicability, out var deprecatedVersion) && deprecatedVersion > currentStackVersion)
 						{
 							badgeText = "Deprecation planned";
 							tooltip = "We plan to deprecate this functionality in a future update. Plans may change without notice.";
 						}
 
 						break;
 					case ProductLifecycle.Removed:
-						if (applicability.Version is not null && applicability.Version > currentStackVersion)
+						if (TryGetRealVersion(applicability, out var removedVersion) && removedVersion > currentStackVersion)
 						{
 							badgeText = "Removal planned";
 							tooltip = "We plan to remove this functionality in a future update. Plans may change without notice.";
@@ -177,3 +178,16 @@
 		return HtmlString.Empty;
 	}
 }
+@functions {
+	private static bool TryGetRealVersion(Applicability applicability, [NotNullWhen(true)] out SemVersion? version)
+	{
+		version = null;
+		if (applicability.Version is not null && applicability.Version != AllVersions.Instance)
+		{
+			version = applicability.Version;
+			return true;
+		}
+
+		return false;
+	}
+}