Merge pull request #164 from AdmiringWorm/feature/deprecated-pkg-rule

(GH-70) Implemented rule to validate deprecated package have dependency

Author: gep13

docs/input/docs/rules/choco0007.md

@@ -0,0 +1,27 @@
+---
+Title: DeprecatedPackagesMustHaveADependency
+Description:
+Category: Requirements
+---
+
+:::{.alert .alert-warning}
+**Preliminary Notice**
+This rule is not yet available in chocolatey-vscode.
+It is a planned rule for 0.8.0.
+:::
+
+**NOTE**: This page is a stub that has not yet been filled out. If you have questions about this issue, please ask in the review or reach out on [Gitter](https://gitter.im/chocolatey/chocolatey.org)
+
+## Issue
+
+In the nuspec,
+
+## Recommended Solution
+
+Please update _ so that _
+
+## Reasoning
+
+## See also
+
+- [Package validator rule](https://github.com/chocolatey/package-validator/wiki/DeprecatedPackagesMustHaveADependency){target = _blank}

src/Chocolatey.Language.Server/Validations/DeprecatedPackagesShouldHaveDependency.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Chocolatey.Language.Server.Models;
+using OmniSharp.Extensions.LanguageServer.Protocol.Models;
+
+namespace Chocolatey.Language.Server.Validations
+{
+    public sealed class DeprecatedPackagesShouldHaveDependency : NuspecRuleBase
+    {
+        private const string VALIDATION_MESSAGE = "Deprecated Packages must contain a dependency to the package(s) which the package is deprecating for.";
+        public override string Id => "choco0007";
+
+        public override string DocumentationUrl => $"https://gep13.github.io/chocolatey-vscode/docs/rules/{Id}";
+
+        public override ValidationType ValidationType => ValidationType.Requirement;
+
+        public override IEnumerable<Diagnostic> Validate(Package package)
+        {
+            if (package.Title.IsMissing)
+            {
+                yield break;
+            }
+
+            if (package.Title.Value.Contains("deprecated", StringComparison.OrdinalIgnoreCase)
+                && !package.Dependencies.Any())
+            {
+                yield return CreateDiagnostic(package, VALIDATION_MESSAGE);
+            }
+        }
+    }
+}