Added completer for PropertyBag Keys

Author: erwinvanhunen

src/Commands/Base/Completers/PropertyBagKeyCompleter.cs

@@ -0,0 +1,45 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+using System.Management.Automation;
+using System.Management.Automation.Language;
+using System.Reflection.Metadata;
+using Microsoft.SharePoint.Client;
+using PnP.Framework.Utilities;
+
+namespace PnP.PowerShell.Commands.Base.Completers
+{
+    public sealed class PropertyBagKeyCompleter : IArgumentCompleter
+    {
+        public IEnumerable<CompletionResult> CompleteArgument(string commandName, string parameterName, string wordToComplete, CommandAst commandAst, IDictionary fakeBoundParameters)
+        {
+            wordToComplete = wordToComplete.Trim('"');
+
+            IEnumerable<string> keys = null;
+            if (fakeBoundParameters["Folder"] == null)
+            {
+                PnPConnection.Current.Context.Web.EnsureProperty(w => w.AllProperties);
+
+                keys = PnPConnection.Current.Context.Web.AllProperties.FieldValues.Select(x => x.Key);
+            }
+            else
+            {
+                var folderName = fakeBoundParameters["Folder"] as string;
+                PnPConnection.Current.Context.Web.EnsureProperty(w => w.ServerRelativeUrl);
+
+                var folderUrl = UrlUtility.Combine(PnPConnection.Current.Context.Web.ServerRelativeUrl, folderName);
+                var folder = PnPConnection.Current.Context.Web.GetFolderByServerRelativePath(ResourcePath.FromDecodedUrl(folderUrl));
+                folder.EnsureProperty(f => f.Properties);
+
+                keys = folder.Properties.FieldValues.Select(x => x.Key);
+
+            }
+
+            foreach (var key in keys.Where(k => k.StartsWith(wordToComplete, StringComparison.InvariantCultureIgnoreCase)))
+            {
+                yield return new CompletionResult($"\"{key}\"");
+            }
+        }
+    }
+}

src/Commands/Web/GetPropertyBag.cs

@@ -4,6 +4,7 @@
 using Microsoft.SharePoint.Client;
 
 using PnP.Framework.Utilities;
+using PnP.PowerShell.Commands.Base.Completers;
 using PnP.PowerShell.Commands.Model;
 
 namespace PnP.PowerShell.Commands
@@ -17,6 +18,7 @@ public class GetPropertyBag : PnPWebCmdlet
         public const string ParameterSet_Key = "Key";
 
         [Parameter(Mandatory = false, Position = 0, ValueFromPipeline = true, ParameterSetName = ParameterSet_Key)]
+        [ArgumentCompleter(typeof(PropertyBagKeyCompleter))]
         public string Key = string.Empty;
 
         [Parameter(Mandatory = false)]