Map editor: wheel/MMB scrolling, characters and items tabs to place NPCs, enemies and pickups, events saved to map_events with other files and mods shown locked, LF output

src/RpgItemCatalog.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using Cthangover.Core.Items;
+using Cthangover.Core.Mods.Resolvers;
+using Cthangover.Mods.Rpg;
+using Godot;
+
+namespace Cthangover.Tools.RpgEditor
+{
+    /// <summary>
+    /// The items the running game knows (<c>Kind: item</c> of every loaded mod),
+    /// sorted by display name, for laying them on a map. The look is the item's
+    /// own <c>Sprite</c> in the <c>items</c> group, the picture the inventory
+    /// shows; an item whose picture is missing gets none (the texture loader
+    /// would log an error for it).
+    /// </summary>
+    public static class RpgItemCatalog
+    {
+        /// <summary>Reads the item list anew.</summary>
+        public static List<RpgPickerEntry> Load(RpgTextures textures)
+        {
+            var pictures = GroupFiles(RpgTextures.IconGroup);
+            return (Entities.Collect<ItemInfo>()?.Values ?? Enumerable.Empty<ItemInfo>())
+                .Where(info => !string.IsNullOrEmpty(info.ID))
+                .Select(info => Entry(info, pictures.Contains(info.Sprite ?? string.Empty) ? info.Sprite : null, textures))
+                .OrderBy(entry => entry.Name, StringComparer.CurrentCultureIgnoreCase)
+                .ToList();
+        }
+
+        /// <summary>Paths of a file group without extensions, case-insensitive: what exists to be loaded.</summary>
+        public static HashSet<string> GroupFiles(string group)
+        {
+            var paths = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
+            var files = Files.Collect(group);
+            if (files != null)
+            {
+                foreach (var key in files.Keys)
+                    paths.Add(Path.ChangeExtension(key, null));
+            }
+            return paths;
+        }
+
+        private static RpgPickerEntry Entry(ItemInfo info, string picture, RpgTextures textures) => new()
+        {
+            Id = info.ID,
+            Name = string.IsNullOrEmpty(info.Name) ? info.ID : TranslationServer.Translate(info.Name).ToString(),
+            Look = picture,
+            Icon = picture == null ? null : textures.Icon(picture)
+        };
+    }
+}