Relax version directive argument, allow for major.minor format (#89)

Author: Mpdreamz

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

@@ -3,6 +3,7 @@
 // See the LICENSE file in the project root for more information
 
 using Elastic.Markdown.Helpers;
+using static System.StringSplitOptions;
 
 namespace Elastic.Markdown.Myst.Directives;
 
@@ -17,7 +18,7 @@ public class VersionBlock(DirectiveBlockParser parser, string directive, Diction
 
 	public override void FinalizeAndValidate(ParserContext context)
 	{
-		var tokens = Arguments?.Split(" ", 2, StringSplitOptions.RemoveEmptyEntries) ?? [];
+		var tokens = Arguments?.Split(" ", 2, RemoveEmptyEntries) ?? [];
 		if (tokens.Length < 1)
 		{
 			EmitError(context, $"{directive} needs exactly 2 arguments: <version> <title>");
@@ -26,8 +27,9 @@ public override void FinalizeAndValidate(ParserContext context)
 
 		if (!SemVersion.TryParse(tokens[0], out var version))
 		{
-			EmitError(context, $"{tokens[0]} is not a valid version");
-			return;
+			var numbers = tokens[0].Split('.', RemoveEmptyEntries);
+			if (numbers.Length != 2 || !SemVersion.TryParse($"{numbers[0]}.{numbers[1]}.0", out version))
+				EmitError(context, $"'{tokens[0]}' is not a valid version");
 		}
 
 		Version = version;

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

@@ -50,3 +50,35 @@ public class VersionDeprectatedTests(ITestOutputHelper output) : VersionTests(ou
 	[Fact]
 	public void SetsTitle() => Block!.Title.Should().Be("Deprecated (1.0.1-beta1): more information");
 }
+
+public abstract class VersionValidationTests(ITestOutputHelper output, string version) : DirectiveTest<VersionBlock>(output,
+$$"""
+```{versionchanged} {{version}} more information
+Version brief summary
+```
+A regular paragraph.
+"""
+);
+
+public class SimpleVersion(ITestOutputHelper output) : VersionValidationTests(output, "7.17")
+{
+	[Fact]
+	public void SetsVersion() => Block!.Version.Should().Be(new SemVersion(7, 17, 0));
+
+	[Fact]
+	public void HasNoError() => Collector.Diagnostics.Should().BeEmpty();
+}
+
+public class MajorVersionOnly(ITestOutputHelper output) : VersionValidationTests(output, "8")
+{
+	[Fact]
+	public void HasError() => Collector.Diagnostics.Should().HaveCount(1)
+		.And.Contain(d => d.Message.Contains("'8' is not a valid version"));
+}
+
+public class BranchVersion(ITestOutputHelper output) : VersionValidationTests(output, "8.x")
+{
+	[Fact]
+	public void HasError() => Collector.Diagnostics.Should().HaveCount(1)
+		.And.Contain(d => d.Message.Contains("'8.x' is not a valid version"));
+}