support exporting Outstanding Failures to file

ii/MainWindow.cs

@@ -6,6 +6,7 @@
 using IsIdentifiable.Rules;
 using System;
 using System.Collections.Generic;
+using System.IO;
 using System.IO.Abstractions;
 using System.Linq;
 using System.Text;
@@ -86,7 +87,8 @@ public MainWindow(IsIdentifiableOptions analyserOpts, IsIdentifiableReviewerOpti
         Menu = new MenuBar(new MenuBarItem[] {
             new("_File (F9)", new MenuItem [] {
                 new("_Open Report",null, OpenReport),
-                new("_Quit", null, static () => Application.RequestStop())
+                new("_Export 'Outstanding Failures'", null, ExportOutstandingFailures),
+                new("_Quit", null, static () => Application.RequestStop()),
             }),
             new("_Options", new MenuItem [] {
                 miCustomPatterns = new MenuItem("_Custom Patterns",null,ToggleCustomPatterns){CheckType = MenuItemCheckStyle.Checked,Checked = false}
@@ -431,6 +433,24 @@ private void Update()
         BeginNext();
     }
 
+    private void ExportOutstandingFailures()
+    {
+        if (rulesView.OutstandingFiles == null)
+        {
+            Helpers.ShowMessage("Error", "You must evaluate the rules on a report first.");
+            return;
+        }
+
+        var now = DateTime.UtcNow.ToString("s").Replace(':', '-');
+        var fileName = $"OutstandingFiles-{now}.csv";
+        using var sw = new StreamWriter(fileName);
+
+        foreach (var file in rulesView.OutstandingFiles)
+            sw.WriteLine(file);
+
+        Helpers.ShowMessage("Complete", $"Wrote {rulesView.OutstandingFiles.Count} unique item(s) to {fileName}");
+    }
+
     private void OpenReport()
     {
         using var ofd = new OpenDialog("Load CSV Report", "Enter file path to load")

ii/Views/RulesView.cs

@@ -17,6 +17,8 @@ class RulesView : View
     public IgnoreRuleGenerator? Ignorer { get; private set; }
     public RowUpdater? Updater { get; private set; }
 
+    public List<string>? OutstandingFiles { get; private set; }
+
     private readonly TreeView _treeView;
 
     /// <summary>
@@ -536,6 +538,8 @@ private void EvaluateRuleCoverageAsync(Label stage, ProgressBar progress, Label
                 .OrderByDescending(v => v.Failures.Sum(f => f.NumberOfTimesReported))
                 .Cast<ITreeNode>()
                 .ToList();
+
+        OutstandingFiles = outstandingFailures.Select(x => x.Value.Failure.Resource).Distinct().ToList();
     }
 
     private static void SetProgress(ProgressBar pb, View tp, int done, int max)