Search by regex, modal Enter fixes

src/AppCommon/FileTime.App.Search/RegexMatcher.cs

@@ -0,0 +1,61 @@
+using System.Text.RegularExpressions;
+using FileTime.App.Core.Models;
+using FileTime.Core.Models;
+
+namespace FileTime.App.Search;
+
+public class RegexMatcher : ISearchMatcher
+{
+    private readonly Regex _regex;
+
+    public RegexMatcher(string pattern)
+    {
+        _regex = new Regex(pattern);
+    }
+
+    public Task<bool> IsItemMatchAsync(IItem item)
+        => Task.FromResult(_regex.IsMatch(item.DisplayName));
+
+    public List<ItemNamePart> GetDisplayName(IItem item)
+    {
+        var displayName = item.DisplayName;
+
+        var match = _regex.Match(item.DisplayName);
+        var splitPoints = new List<int>(match.Groups.Count * 2);
+        if (match.Groups.Count == 0)
+        {
+            return new List<ItemNamePart>
+            {
+                new(displayName)
+            };
+        }
+
+        var areEvensSpecial = match.Groups[0].Index == 0;
+        var isSpecialMatchNumber = areEvensSpecial ? 0 : 1;
+
+        foreach (Group group in match.Groups)
+        {
+            splitPoints.Add(group.Index);
+            splitPoints.Add(group.Index + group.Value.Length);
+        }
+
+        if (splitPoints[0] != 0)
+            splitPoints.Insert(0, 0);
+
+        var itemNameParts = new List<ItemNamePart>();
+        for (var i = 0; i < splitPoints.Count; i++)
+        {
+            var index = splitPoints[i];
+            var nextIndex = i == splitPoints.Count - 1
+                ? displayName.Length
+                : splitPoints[i + 1];
+
+            if (nextIndex == index) continue;
+
+            var text = displayName.Substring(index, nextIndex - index);
+            itemNameParts.Add(new ItemNamePart(text, i % 2 == isSpecialMatchNumber));
+        }
+
+        return itemNameParts;
+    }
+}