test: the in-memory disk has the root of an absolute Linux path

Data names are now found whatever their letter case on Linux.

StarterNG.Tests/CaseInsensitivePathsTests.cs

@@ -0,0 +1,119 @@
+using StarterNG.Infrastructure;
+using StarterNG.Tests.Fakes;
+
+namespace StarterNG.Tests;
+
+public class CaseInsensitivePathsTests
+{
+    private static InMemoryFileSystem Disk() => new InMemoryFileSystem(caseSensitive: true)
+        .WithFile("game/scenery/Braniewo/Base.ctr", "")
+        .WithFile("game/scenery/Braniewo/rozklady/TGS3657.txt", "")
+        .WithDirectory("game/textures/mini");
+
+    [Theory]
+    [InlineData("braniewo/base.ctr", "Braniewo/Base.ctr")]
+    [InlineData(@"BRANIEWO\Rozklady\tgs3657.TXT", "Braniewo/rozklady/TGS3657.txt")]
+    [InlineData("Braniewo/Base.ctr", "Braniewo/Base.ctr")]
+    [InlineData("braniewo//base.ctr", "Braniewo/Base.ctr")]
+    [InlineData("/braniewo/base.ctr", "Braniewo/Base.ctr")]
+    [InlineData(@"\Braniewo\Base.ctr", "Braniewo/Base.ctr")]
+    public void A_name_in_any_case_is_given_as_it_is_on_disk(string name, string onDisk) =>
+        Assert.Equal(onDisk, new CaseInsensitivePaths(Disk()).Resolve("game/scenery", name));
+
+    [Theory]
+    [InlineData("braniewo/brak.ctr")]
+    [InlineData("brak/base.ctr")]
+    [InlineData("")]
+    public void A_name_nothing_answers_to_is_not_found(string name) =>
+        Assert.Null(new CaseInsensitivePaths(Disk()).Resolve("game/scenery", name));
+
+    [Fact]
+    public void A_folder_is_found_only_when_one_is_asked_for()
+    {
+        var names = new CaseInsensitivePaths(Disk());
+
+        Assert.Equal("Braniewo/rozklady", names.Resolve("game/scenery", "braniewo/ROZKLADY", directory: true));
+        Assert.Null(names.Resolve("game/scenery", "braniewo/ROZKLADY"));
+        Assert.Null(names.Resolve("game/scenery", "braniewo/base.ctr", directory: true));
+    }
+
+    [Fact]
+    public void The_name_written_as_on_disk_wins_over_one_in_other_case()
+    {
+        var files = Disk().WithFile("game/scenery/braniewo/base.ctr", "");
+        var names = new CaseInsensitivePaths(files);
+
+        Assert.Equal("braniewo/base.ctr", names.Resolve("game/scenery", "braniewo/base.ctr"));
+        Assert.Equal("Braniewo/Base.ctr", names.Resolve("game/scenery", "Braniewo/base.CTR"));
+    }
+
+    [Fact]
+    public void Of_folders_named_alike_the_one_holding_the_file_is_taken()
+    {
+        var files = Disk().WithFile("game/scenery/braniewo/tory.scm", "");
+        var names = new CaseInsensitivePaths(files);
+
+        Assert.Equal("Braniewo/Base.ctr", names.Resolve("game/scenery", "braniewo/base.ctr"));
+        Assert.Equal("braniewo/tory.scm", names.Resolve("game/scenery", "Braniewo/Tory.scm"));
+    }
+
+    [Fact]
+    public void The_full_path_joins_the_folder_and_the_name_on_disk() =>
+        Assert.Equal(Path.Combine("game/scenery", "Braniewo", "Base.ctr"),
+                     new CaseInsensitivePaths(Disk()).Find("game/scenery", "BRANIEWO/BASE.CTR"));
+
+    [Fact]
+    public void A_full_path_is_found_from_its_own_root()
+    {
+        string scenery = Path.GetFullPath(Path.Combine("game", "scenery"));
+        var files = new InMemoryFileSystem(caseSensitive: true)
+            .WithFile(Path.Combine(scenery, "Braniewo", "Base.ctr"), "");
+
+        Assert.Equal(Path.Combine(scenery, "Braniewo", "Base.ctr"),
+                     new CaseInsensitivePaths(files).Find("elsewhere", Path.Combine(scenery, "BRANIEWO", "base.CTR")));
+    }
+
+    [Fact]
+    public void A_disk_that_ignores_case_gives_the_name_back_as_written()
+    {
+        var files = new InMemoryFileSystem().WithFile("game/scenery/Braniewo/Base.ctr", "");
+        var names = new CaseInsensitivePaths(files);
+
+        Assert.Equal("BRANIEWO/base.CTR", names.Resolve("game/scenery", "BRANIEWO/base.CTR"));
+        Assert.Null(names.Resolve("game/scenery", "braniewo/brak.ctr"));
+    }
+
+    [Fact]
+    public void Kept_listings_hold_until_forgotten()
+    {
+        var files = Disk();
+        var names = new CaseInsensitivePaths(files, keepListings: true);
+        Assert.Null(names.Resolve("game/scenery", "braniewo/nowy.scm"));
+
+        files.WithFile("game/scenery/Braniewo/Nowy.scm", "");
+        Assert.Null(names.Resolve("game/scenery", "braniewo/nowy.scm"));
+
+        names.Forget();
+        Assert.Equal("Braniewo/Nowy.scm", names.Resolve("game/scenery", "braniewo/nowy.scm"));
+    }
+
+    [Fact]
+    public void Listings_not_kept_see_a_file_added_since()
+    {
+        var files = Disk();
+        var names = new CaseInsensitivePaths(files);
+        Assert.Null(names.Resolve("game/scenery", "braniewo/nowy.scm"));
+
+        files.WithFile("game/scenery/Braniewo/Nowy.scm", "");
+
+        Assert.Equal("Braniewo/Nowy.scm", names.Resolve("game/scenery", "braniewo/nowy.scm"));
+    }
+
+    [Fact]
+    public void A_folder_that_cannot_be_listed_holds_nothing_to_find()
+    {
+        var files = Disk().DenyListing("game/scenery");
+
+        Assert.Null(new CaseInsensitivePaths(files).Resolve("game/scenery", "braniewo/base.ctr"));
+    }
+}

StarterNG.Tests/Fakes/InMemoryFileSystem.cs

@@ -97,6 +97,8 @@ public sealed class InMemoryFileSystem : IFileSystem
         return this;
     }
 
+    public bool IgnoresCase => _comparison == StringComparison.OrdinalIgnoreCase;
+
     public bool FileExists(string path) => _files.ContainsKey(Normalize(path));
 
     /// <summary>A link counts as the directory it points at, as the disk has it.</summary>
@@ -273,6 +275,9 @@ public sealed class InMemoryFileSystem : IFileSystem
                 return;
             slash = key.LastIndexOf('/');
         }
+        // An absolute Unix path's parent is the root, "/", which normalises to "".
+        if (slash == 0)
+            _directories.Add("");
     }
 
     private static string Normalize(string path) =>

StarterNG.Tests/LoadingScreenLogoTests.cs

@@ -0,0 +1,28 @@
+using StarterNG.Infrastructure;
+using StarterNG.Tests.Fakes;
+
+namespace StarterNG.Tests;
+
+public class LoadingScreenLogoTests
+{
+    private static InMemoryFileSystem Logos() => new InMemoryFileSystem(caseSensitive: true)
+        .WithFile("game/Textures/Logo/EP09_Logo.PNG", "png")
+        .WithFile("game/Textures/Logo/Braniewo.JPG", "jpg")
+        .WithFile("game/Textures/Logo/Logo1.BMP", "bmp")
+        .WithFile("game/Textures/Logo/notes.txt", "");
+
+    [Theory]
+    [InlineData("ep09_logo", null, "EP09_Logo.PNG")]
+    [InlineData("ep09_logo.bmp", "braniewo", "EP09_Logo.PNG")]
+    [InlineData(null, "braniewo", "Braniewo.JPG")]
+    [InlineData("brak", "brak", "Logo1.BMP")]
+    public void The_logo_is_found_whatever_the_case_of_its_name_and_extension(string? logo, string? scenery,
+                                                                             string onDisk) =>
+        Assert.Equal(Path.GetFullPath(Path.Combine("game", "Textures", "Logo", onDisk)),
+                     Path.GetFullPath(LoadingScreen.FindSource(Logos(), "game", logo, scenery, new Random(1))!));
+
+    [Fact]
+    public void With_no_logo_folder_there_is_no_logo() =>
+        Assert.Null(LoadingScreen.FindSource(new InMemoryFileSystem(caseSensitive: true), "game", "x", "y",
+                                             new Random(1)));
+}

StarterNG.Tests/PhysicalFileSystemTests.cs

@@ -21,6 +21,20 @@ public sealed class PhysicalFileSystemTests : IDisposable
         Assert.Equal(new[] { path }, Directory.GetFiles(_root));
     }
 
+    [Fact]
+    public void A_pattern_lists_names_in_any_letter_case()
+    {
+        Directory.CreateDirectory(Path.Combine(_root, "PKP", "EP09"));
+        foreach (string name in new[] { "Braniewo.SCN", "kato.scn", "notes.txt", Path.Combine("PKP", "EP09", "EP09.FIZ"),
+                                        Path.Combine("PKP", "EP09", "ep09dumb.fiz") })
+            File.WriteAllText(Path.Combine(_root, name), "");
+
+        Assert.Equal(new[] { "Braniewo.SCN", "kato.scn" },
+                     _files.GetFiles(_root, "*.scn").Select(Path.GetFileName).Order(StringComparer.Ordinal));
+        Assert.Equal(new[] { "EP09.FIZ", "ep09dumb.fiz" },
+                     _files.GetFilesRecursive(_root, "*.fiz").Select(Path.GetFileName).Order(StringComparer.Ordinal));
+    }
+
     [Fact]
     public void An_atomic_write_that_cannot_finish_leaves_what_stood_there()
     {

StarterNG.Tests/PhysicsAndAssetsTests.cs

@@ -65,6 +65,32 @@ public class PhysicsAndAssetsTests
         Assert.Equal(125, physics.VMax);
     }
 
+    [Fact]
+    public void An_include_named_in_other_case_is_followed()
+    {
+        var installation = new TestInstallation(new InMemoryFileSystem(caseSensitive: true)
+            .WithFile(Fiz("pkp", "ep07", "ep07"), "include Common.FIZ 84000 end")
+            .WithFile(TestInstallation.At("dynamic", "pkp", "ep07", "common.fiz"), "Param: M=(1) Vmax=125"));
+
+        var physics = installation.Physics.For("pkp/ep07/", "ep07")!;
+
+        Assert.Equal(84000, physics.Mass);
+        Assert.Equal(125, physics.VMax);
+    }
+
+    [Fact]
+    public void A_dot_in_the_model_name_is_part_of_the_name()
+    {
+        // As in the game: cd/9-107_v1 holds 9-107.13.fiz, 9-107.6.fiz and more.
+        var installation = new TestInstallation(new InMemoryFileSystem()
+            .WithFile(Fiz("cd", "9-107_v1", "9-107.13"), "Load: LoadAccepted=coal MaxLoad=58")
+            .WithFile(Fiz("cd", "9-107_v1", "9-107.6"), "Load: LoadAccepted=coal MaxLoad=55"));
+
+        Assert.Equal(58, installation.Physics.For("cd/9-107_v1/", "9-107.13")!.MaxLoad);
+        Assert.Equal(55, installation.Physics.For("cd/9-107_v1/", "9-107.6")!.MaxLoad);
+        Assert.Equal(58, installation.Physics.For("cd/9-107_v1/", "9-107.13.e3d")!.MaxLoad);
+    }
+
     [Fact]
     public void A_dumb_variant_stands_in_when_the_model_has_no_fiz_of_its_own()
     {
@@ -189,4 +215,31 @@ public class PhysicsAndAssetsTests
 
         Assert.Empty(installation.MissingAssets.Scan(installation.Library.Vehicles));
     }
+
+    [Fact]
+    public void A_livery_with_no_folder_is_looked_for_in_dynamic_itself()
+    {
+        var installation = new TestInstallation(new InMemoryFileSystem(caseSensitive: true)
+            .WithFile(TestInstallation.At("dynamic", "EP09.bmp"), "bitmap")
+            .WithFile(TestInstallation.At("dynamic", "ep09.e3d"), "model"));
+        var catalog = new StarterNG.Domain.Vehicles.VehicleCatalog(installation.MiniTextures);
+        catalog.Textures.Add(new StarterNG.Domain.Vehicles.VehicleTexture { Directory = "", Skinfile = "ep09", Model = "EP09" });
+
+        Assert.Empty(installation.MissingAssets.Scan(catalog));
+    }
+
+    [Fact]
+    public void A_skin_and_model_on_disk_in_other_case_are_not_reported()
+    {
+        var files = new InMemoryFileSystem(caseSensitive: true)
+            .WithFile(TestInstallation.At("dynamic", "PKP", "EP09", "textures.txt"),
+                      "EP09-014.mat=ep09.e3d,ep09")
+            .WithFile(TestInstallation.At("dynamic", "PKP", "EP09", "ep09-014.BMP"), "bitmap")
+            .WithFile(TestInstallation.At("dynamic", "PKP", "EP09", "EP09.E3D"), "model");
+        var installation = new TestInstallation(files);
+        installation.Vehicles.Load(installation.Library.Vehicles);
+        Assert.NotEmpty(installation.Library.Vehicles.Textures);
+
+        Assert.Empty(installation.MissingAssets.Scan(installation.Library.Vehicles));
+    }
 }

StarterNG.Tests/ScenarioPresentationTests.cs

@@ -182,6 +182,20 @@ public class TimetableLocatorTests
         Assert.NotNull(new TimetableLocator(files).Resolve(scenery, "r1.txt"));
     }
 
+    [Theory]
+    [InlineData(@"rozklady\tgs3657")]
+    [InlineData("ROZKLADY/TGS3657.TXT")]
+    public void A_timetable_named_in_other_case_or_with_backslashes_is_found_as_on_disk(string name)
+    {
+        var files = new InMemoryFileSystem(caseSensitive: true)
+            .WithFile(TestInstallation.At("scenery", "Braniewo.scn"), "//$n Braniewo")
+            .WithFile(TestInstallation.At("scenery", "Rozklady", "TGS3657.txt"), "rozkład");
+        var scenery = Assert.Single(new TestInstallation(files).Sceneries.LoadAll());
+
+        Assert.Equal(TestInstallation.At("scenery", "Rozklady", "TGS3657.txt"),
+                     new TimetableLocator(files).Resolve(scenery, name));
+    }
+
     [Fact]
     public void The_formats_none_and_a_missing_file_both_resolve_to_nothing()
     {
@@ -195,3 +209,26 @@ public class TimetableLocatorTests
         Assert.Null(locator.Resolve(scenery, null));
     }
 }
+
+public class AttachmentLocatorTests
+{
+    [Theory]
+    [InlineData(@"scenery\Braniewo\opis.PDF")]
+    [InlineData("SCENERY/braniewo/Opis.pdf")]
+    public void An_attachment_named_in_other_case_is_found_as_on_disk(string named)
+    {
+        var installation = new TestInstallation(new InMemoryFileSystem(caseSensitive: true)
+            .WithFile(TestInstallation.At("scenery", "Braniewo", "Opis.pdf"), "%PDF"));
+
+        Assert.Equal(TestInstallation.At("scenery", "Braniewo", "Opis.pdf"),
+                     new AttachmentLocator(installation.Files, installation.Paths)
+                         .Resolve(new SceneryAttachment { FilePath = named }));
+    }
+
+    [Theory]
+    [InlineData("scenery/brak.pdf")]
+    [InlineData("")]
+    public void An_attachment_that_is_not_there_is_not_found(string named) =>
+        Assert.Null(new AttachmentLocator(new InMemoryFileSystem(caseSensitive: true), new TestInstallation().Paths)
+                        .Resolve(new SceneryAttachment { FilePath = named }));
+}

StarterNG.Tests/SceneryRepositoryTests.cs

@@ -89,6 +89,23 @@ public class SceneryRepositoryTests
         Assert.Equal(Path.Combine("game", "scenery", "images", "kato.jpg"), image);
     }
 
+    [Theory]
+    [InlineData("calkowo_v2_kopalniaA.jpg", "game/scenery/images/calkowo_v2_kopalniaA.jpg")]
+    [InlineData(@"Images\Calkowo_V2_KopalniaA.JPG", "game/scenery/images/calkowo_v2_kopalniaA.jpg")]
+    [InlineData("CALKOWO_V2.JPG", "game/scenery/Calkowo_v2.jpg")]
+    public void The_preview_image_is_found_whatever_the_case_it_is_named_in(string named, string onDisk)
+    {
+        var files = new InMemoryFileSystem(caseSensitive: true)
+            .WithFile("game/scenery/calkowo.scn", "//$i " + named)
+            .WithFile("game/scenery/images/calkowo_v2_kopalniaA.jpg", "binary")
+            .WithFile("game/scenery/Calkowo_v2.jpg", "binary");
+        var scenery = Assert.Single(Build(files, out _).LoadAll());
+
+        string? image = new SceneryImageLocator(files).Resolve(scenery);
+
+        Assert.Equal(Path.GetFullPath(onDisk), Path.GetFullPath(image!));
+    }
+
     [Fact]
     public void A_scenery_without_an_image_directive_resolves_to_nothing()
     {

StarterNG.Tests/ScenerySyntaxTests.cs

@@ -273,7 +273,7 @@ public class ScenerySyntaxTests
             include koniec.scm
             """;
 
-        var scenery = TestScenery.Parser().Parse("scenery/x.scn", scn, _ => new IncludeLookup(true));
+        var scenery = TestScenery.Parser().Parse("scenery/x.scn", scn, _ => true);
 
         Assert.Empty(scenery.Faults);
         Assert.Equal("td/rozklad", Assert.Single(scenery.Trainsets).Name);
@@ -326,7 +326,7 @@ public class ScenerySyntaxTests
             endoptional
             """;
 
-        var faults = TestScenery.Parser().Parse("scenery/x.scn", scn, name => new IncludeLookup(name is "tory.scm" or "budynek.inc")).Faults;
+        var faults = TestScenery.Parser().Parse("scenery/x.scn", scn, name => name is "tory.scm" or "budynek.inc").Faults;
 
         Assert.Equal((SceneryFaultKind.MissingInclude, "x.scn", 2, null, "brak.scm"), Seen(Assert.Single(faults)));
     }
@@ -347,9 +347,9 @@ public class ScenerySyntaxTests
     }
 
     [Fact]
-    public void An_include_on_disk_only_in_other_letter_case_is_what_linux_misses()
+    public void An_include_on_disk_in_other_letter_case_is_no_fault()
     {
-        // The simulator folds the name to lower case and opens it so.
+        // The simulator finds the file whatever the case of its letters, on Linux too.
         var files = new InMemoryFileSystem(caseSensitive: true)
             .WithLegacyFile("game/scenery/braniewo_szeroki.scn",
                             "include braniewo/base.ctr end\ninclude Braniewo/Tory.SCM end\n")
@@ -357,21 +357,20 @@ public class ScenerySyntaxTests
             .WithFile("game/scenery/braniewo/tory.scm", "");
         var repository = TestScenery.Repository(files);
 
-        var faults = repository.Load("game/scenery/braniewo_szeroki.scn")!.Faults;
-
-        Assert.Equal((SceneryFaultKind.IncludeLetterCase, "braniewo_szeroki.scn", 1, "Braniewo/Base.ctr", "braniewo/base.ctr"),
-                     Seen(Assert.Single(faults)));
+        Assert.Empty(repository.Load("game/scenery/braniewo_szeroki.scn")!.Faults);
     }
 
     [Theory]
-    [InlineData(true)]
-    [InlineData(false)]
-    public void A_missing_terrain_file_is_no_fault_while_the_scenery_has_its_own_sbt(bool sbt)
+    [InlineData(null)]
+    [InlineData("lk2_sandbox.sbt")]
+    [InlineData("Lk2_Sandbox.SBT")]
+    public void A_missing_terrain_file_is_no_fault_while_the_scenery_has_its_own_sbt(string? sbtOnDisk)
     {
+        bool sbt = sbtOnDisk is not null;
         var files = new InMemoryFileSystem(caseSensitive: true)
             .WithLegacyFile("game/scenery/Lk2_Sandbox.scn", "include nmt/nmt100_mazowieckie_ter.scm end\nFirstInit\n");
         if (sbt)
-            files.WithFile("game/scenery/lk2_sandbox.sbt", "EU07");
+            files.WithFile("game/scenery/" + sbtOnDisk, "EU07");
         var repository = TestScenery.Repository(files);
 
         var scenery = repository.Load("game/scenery/Lk2_Sandbox.scn")!;

StarterNG.Tests/SceneryTranslationsTests.cs

@@ -39,6 +39,24 @@ public class SceneryTranslationsTests
         Assert.Equal("Polski", scenery.LocalizedDescription(translations));
     }
 
+    [Fact]
+    public void The_tables_are_found_whatever_the_case_of_their_names()
+    {
+        var files = new InMemoryFileSystem(caseSensitive: true)
+            .WithFile(TestInstallation.At("scenery", "Braniewo.scn"), "//$d @brief")
+            .WithFile(Path.Combine(Path.GetFullPath(TestInstallation.At("scenery")), "I18N", "braniewo_en.json"),
+                      """{ "brief": "English" }""")
+            .WithFile(Path.Combine(Path.GetFullPath(TestInstallation.At("scenery")), "I18N", "BRANIEWO_PL.json"),
+                      """{ "brief": "Polski" }""");
+        var installation = new TestInstallation(files);
+        var scenery = Assert.Single(installation.Sceneries.LoadAll());
+        var translations = new SceneryTranslations(files, installation.Log);
+
+        translations.LoadFor(scenery, "Polski");
+
+        Assert.Equal("Polski", scenery.LocalizedDescription(translations));
+    }
+
     [Fact]
     public void Literal_text_and_unknown_keys_are_left_alone()
     {

StarterNG.Tests/TapeLaunchTests.cs

@@ -130,6 +130,17 @@ public class TapeLaunchTests
         Assert.Null(new StarterNG.Infrastructure.Sceneries.TimetableLocator(new InMemoryFileSystem())
                         .TrainNumber(new StarterNG.Domain.Sceneries.Scenery(TestInstallation.At("scenery", "td.scn"), ""), name));
 
+    [Fact]
+    public void The_train_number_comes_from_a_timetable_named_in_other_case_with_backslashes()
+    {
+        var files = new InMemoryFileSystem(caseSensitive: true)
+            .WithFile(TestInstallation.At("scenery", "Baltyk", "EIE1531.txt"), "[ Rodzaj i numer pociagu | EIE1531 ]\r\n");
+
+        Assert.Equal("EIE1531", new StarterNG.Infrastructure.Sceneries.TimetableLocator(files)
+                         .TrainNumber(new StarterNG.Domain.Sceneries.Scenery(TestInstallation.At("scenery", "td.scn"), ""),
+                                      @"baltyk\eie1531"));
+    }
+
     [Fact]
     public void A_timetable_that_is_not_there_gives_no_train_number() =>
         Assert.Null(new StarterNG.Infrastructure.Sceneries.TimetableLocator(new InMemoryFileSystem())

StarterNG.Tests/TextureFolderTests.cs

@@ -0,0 +1,22 @@
+using StarterNG.Domain.Vehicles;
+using StarterNG.Infrastructure.Vehicles;
+using StarterNG.Tests.Fakes;
+
+namespace StarterNG.Tests;
+
+public class TextureFolderTests
+{
+    private static readonly TestInstallation Installation = new(new InMemoryFileSystem(caseSensitive: true)
+        .WithFile("game/dynamic/PKP/EP09_v1/textures.txt", "")
+        .WithDirectory("game/Other/Folder"));
+
+    [Theory]
+    [InlineData("pkp/ep09_v1/", "dynamic/PKP/EP09_v1")]
+    [InlineData(@"PKP\EP09_V1", "dynamic/PKP/EP09_v1")]
+    [InlineData("other/folder/", "Other/Folder")]
+    [InlineData("pkp/brak/", "pkp/brak")]
+    public void A_liverys_folder_is_found_as_it_is_named_on_disk(string named, string onDisk) =>
+        Assert.Equal(Path.GetFullPath(Path.Combine("game", onDisk)),
+                     Path.GetFullPath(TextureFolder.Of(Installation.Files, Installation.Paths,
+                                                       new VehicleTexture { Directory = named })));
+}

StarterNG/AppInfo.cs

@@ -13,6 +13,6 @@ public static class AppInfo
 #if DEBUG
         text += " (DEBUG)";
 #endif
-        return text + " public beta";
+        return text;
     }
 }

StarterNG/Application/Abstractions/IFileSystem.cs

@@ -7,6 +7,9 @@ namespace StarterNG.Application.Abstractions;
 
 public interface IFileSystem
 {
+    /// <summary>Whether a name finds its file whatever the case of its letters, as on Windows and macOS.</summary>
+    bool IgnoresCase { get; }
+
     bool FileExists(string path);
 
     bool DirectoryExists(string path);

StarterNG/Application/AppServices.cs

@@ -56,6 +56,7 @@ public sealed class AppServices
         var missingAssets = new MissingAssetScanner(files, paths);
         SceneryTexts = new SceneryTranslations(files, log);
         Timetables = new TimetableLocator(files);
+        Attachments = new AttachmentLocator(files, paths);
         LoadWeights = new LoadWeightsRepository(files, paths, log);
         Library = new GameLibrary(Vehicles, Sceneries, MiniTextures, Physics, log);
         State = new AppState();
@@ -119,6 +120,8 @@ public sealed class AppServices
 
     public TimetableLocator Timetables { get; }
 
+    public AttachmentLocator Attachments { get; }
+
     public LoadWeightsRepository LoadWeights { get; }
 
     public GameLibrary Library { get; }

StarterNG/Domain/Sceneries/SceneryFault.cs

@@ -61,13 +61,6 @@ public enum SceneryFaultKind
     /// <summary>An include whose file is not there; <see cref="SceneryFault.Token"/> names it.</summary>
     MissingInclude,
 
-    /// <summary>
-    /// An include whose file is there only under a name in other letter case: the
-    /// simulator looks for it in lower case, which on Linux misses it. The
-    /// <see cref="SceneryFault.Subject"/> holds the name on disk.
-    /// </summary>
-    IncludeLetterCase,
-
     /// <summary>An include with no <c>end</c>, which swallows what follows it.</summary>
     IncludeNotClosed,
 

StarterNG/Domain/Sceneries/ScenerySyntax.cs

@@ -5,12 +5,6 @@ using System.Linq;
 
 namespace StarterNG.Domain.Sceneries;
 
-/// <summary>
-/// What the simulator makes of an include: whether it opens the file - and when
-/// it does not, the file that is there under a name differing only in letter case.
-/// </summary>
-public readonly record struct IncludeLookup(bool Opens, string? OnDisk = null);
-
 /// <summary>
 /// Goes through a scenery's text for the parts the starter reads - trainsets,
 /// vehicles, includes - finding where each trainset and loose vehicle is, and
@@ -35,17 +29,17 @@ public static class ScenerySyntax
 
     /// <param name="text">The scenery's text, its includes put in place.</param>
     /// <param name="file">The scenery's file name, for faults in its own text.</param>
-    /// <param name="findInclude">
-    /// What the simulator makes of an include, named as the include names it; null
+    /// <param name="opensInclude">
+    /// Whether the simulator opens an include, named as the include names it; null
     /// leaves includes unchecked.
     /// </param>
-    public static Result Scan(string text, string file, Func<string, IncludeLookup>? findInclude = null)
+    public static Result Scan(string text, string file, Func<string, bool>? opensInclude = null)
     {
         string code = SceneryCode.Mask(text, out int unclosed);
         var tokens = SceneryCode.Tokens(code);
         var lines = new SceneryLines(text, file);
 
-        var simulator = new Reading(tokens, lines, findInclude, asSimulator: true);
+        var simulator = new Reading(tokens, lines, opensInclude, asSimulator: true);
         simulator.Run();
         var author = new Reading(tokens, lines, null, asSimulator: false);
         author.Run();
@@ -116,7 +110,7 @@ public static class ScenerySyntax
     }
 
     private sealed class Reading(
-        List<SceneryCode.Token> tokens, SceneryLines lines, Func<string, IncludeLookup>? findInclude, bool asSimulator)
+        List<SceneryCode.Token> tokens, SceneryLines lines, Func<string, bool>? opensInclude, bool asSimulator)
     {
         public readonly List<(int Start, int End, string Name)> Trainsets = new();
         public readonly List<(int, int)> Loose = new();
@@ -375,13 +369,8 @@ public static class ScenerySyntax
                 return stop < tokens.Count && tokens[stop].Is("end") ? stop : stop - 1;
             }
 
-            if (findInclude is not null && Plain(name) && findInclude(name) is { Opens: false } lookup)
-            {
-                if (lookup.OnDisk is { } onDisk)
-                    Fault(SceneryFaultKind.IncludeLetterCase, token.Index, onDisk, name);
-                else
-                    Fault(SceneryFaultKind.MissingInclude, token.Index, token: name);
-            }
+            if (opensInclude is not null && Plain(name) && !opensInclude(name))
+                Fault(SceneryFaultKind.MissingInclude, token.Index, token: name);
 
             // The simulator takes its parameters up to the word "end", written just so,
             // whatever comes before it.

StarterNG/Infrastructure/Adapters/PhysicalFileSystem.cs

@@ -10,6 +10,9 @@ public sealed class PhysicalFileSystem : IFileSystem
 {
     public const string TempSuffix = ".starter.tmp";
 
+    // Their disks as they come; a Linux one tells case apart.
+    public bool IgnoresCase { get; } = OperatingSystem.IsWindows() || OperatingSystem.IsMacOS();
+
     public bool FileExists(string path) => File.Exists(path);
 
     public bool DirectoryExists(string path) => Directory.Exists(path);
@@ -88,8 +91,18 @@ public sealed class PhysicalFileSystem : IFileSystem
     public void CopyFile(string sourcePath, string destinationPath, bool overwrite) =>
         File.Copy(sourcePath, destinationPath, overwrite);
 
+    // The pattern matches names in any letter case, as on Windows: the game's data,
+    // made there, has X.SCN as well as x.scn.
     public IReadOnlyList<string> GetFiles(string path, string searchPattern = "*") =>
-        Directory.Exists(path) ? Directory.GetFiles(path, searchPattern) : Array.Empty<string>();
+        Directory.Exists(path)
+            ? Directory.GetFiles(path, searchPattern, new EnumerationOptions
+            {
+                IgnoreInaccessible = false,
+                AttributesToSkip = 0,
+                MatchType = MatchType.Win32,
+                MatchCasing = MatchCasing.CaseInsensitive
+            })
+            : Array.Empty<string>();
 
     // A folder it may not enter costs what is in it, not the whole listing.
     public IReadOnlyList<string> GetFilesRecursive(string path, string searchPattern) =>
@@ -99,7 +112,8 @@ public sealed class PhysicalFileSystem : IFileSystem
                 RecurseSubdirectories = true,
                 IgnoreInaccessible = true,
                 AttributesToSkip = 0,
-                MatchType = MatchType.Win32
+                MatchType = MatchType.Win32,
+                MatchCasing = MatchCasing.CaseInsensitive
             })
             : Array.Empty<string>();
 

StarterNG/Infrastructure/CaseInsensitivePaths.cs

@@ -0,0 +1,132 @@
+using System;
+using System.Collections.Concurrent;
+using System.IO;
+using System.Linq;
+using StarterNG.Application.Abstractions;
+
+namespace StarterNG.Infrastructure;
+
+/// <summary>
+/// Finds a file or folder of the game's data by a name whose letters may stand in
+/// another case than on disk, as Windows, Wine and the simulator find it, and gives
+/// the name as the disk has it. The data is made on Windows: its names and the
+/// names written in it seldom agree letter for letter, which on Linux matters.
+/// </summary>
+public sealed class CaseInsensitivePaths
+{
+    private readonly IFileSystem _files;
+    private readonly Func<(string Folder, bool Files), ILookup<string, string>> _list;
+
+    /// <summary>Each folder's files and folders by name, listed once until <see cref="Forget"/>; null lists every time.</summary>
+    private readonly ConcurrentDictionary<(string Folder, bool Files), ILookup<string, string>>? _listings;
+
+    /// <param name="keepListings">
+    /// Lists each folder once, for many names looked up in data that stays as it is
+    /// meanwhile, until <see cref="Forget"/>.
+    /// </param>
+    public CaseInsensitivePaths(IFileSystem files, bool keepListings = false)
+    {
+        _files = files;
+        _list = List;
+        if (keepListings)
+            _listings = new ConcurrentDictionary<(string, bool), ILookup<string, string>>();
+    }
+
+    /// <summary>Lets the next lookups list the folders again.</summary>
+    public void Forget() => _listings?.Clear();
+
+    /// <summary>
+    /// The file named so under <paramref name="folder"/> as it is named on disk, relative
+    /// to the folder with forward slashes; null when nothing there answers to it. A name
+    /// written with its letters as on disk wins over one differing only in their case;
+    /// a disk that does not tell case apart gives it back as written.
+    /// </summary>
+    /// <param name="name">
+    /// A name under the folder, with either slash, joined to it as the simulator joins
+    /// it: a slash ahead of it counts for nothing.
+    /// </param>
+    /// <param name="directory">Looks for a folder instead of a file.</param>
+    public string? Resolve(string folder, string name, bool directory = false)
+    {
+        string[] parts = name.Replace('\\', '/').Split('/', StringSplitOptions.RemoveEmptyEntries);
+        if (parts.Length == 0)
+            return null;
+
+        string exact = string.Join('/', parts);
+        string whole = Path.Combine(folder, exact);
+        if (directory ? _files.DirectoryExists(whole) : _files.FileExists(whole))
+            return exact;
+        // Where case does not matter, missed as written is missed in any case.
+        if (_files.IgnoresCase)
+            return null;
+
+        var found = new string[parts.Length];
+        return Walk(folder, parts, 0, directory, found) ? string.Join('/', found) : null;
+    }
+
+    /// <summary>
+    /// The full path of the file named so, its letters as on disk; null when there is
+    /// none. A name given in full is looked up from its own root, any other under
+    /// <paramref name="folder"/> as <see cref="Resolve"/> does.
+    /// </summary>
+    public string? Find(string folder, string name, bool directory = false)
+    {
+        if (Path.IsPathFullyQualified(name))
+        {
+            folder = Path.GetPathRoot(name)!;
+            name = name[folder.Length..];
+        }
+
+        return Resolve(folder, name, directory) is { } found
+            ? Path.Combine(folder, found.Replace('/', Path.DirectorySeparatorChar))
+            : null;
+    }
+
+    /// <summary>
+    /// Finds the parts from <paramref name="at"/> on under <paramref name="current"/>. Of
+    /// folders named alike in other case - two copies of the data on Linux - each is
+    /// tried, the one written as on disk first.
+    /// </summary>
+    private bool Walk(string current, string[] parts, int at, bool directory, string[] found)
+    {
+        if (at == parts.Length)
+            return true;
+
+        string part = parts[at];
+        if (part is "." or "..")
+        {
+            found[at] = part;
+            return Walk(Path.Combine(current, part), parts, at + 1, directory, found);
+        }
+
+        bool last = at == parts.Length - 1;
+        var matches = Listing(current, files: last && !directory)[part]
+            .OrderBy(entry => string.Equals(Path.GetFileName(entry), part, StringComparison.Ordinal) ? 0 : 1);
+        foreach (string match in matches)
+        {
+            found[at] = Path.GetFileName(match);
+            if (Walk(match, parts, at + 1, directory, found))
+                return true;
+        }
+        return false;
+    }
+
+    private ILookup<string, string> Listing(string folder, bool files) =>
+        _listings is null ? List((folder, files)) : _listings.GetOrAdd((folder, files), _list);
+
+    // A folder that cannot be listed holds nothing to be found.
+    private ILookup<string, string> List((string Folder, bool Files) key)
+    {
+        var entries = Array.Empty<string>();
+        try
+        {
+            if (_files.DirectoryExists(key.Folder))
+                entries = (key.Files ? _files.GetFiles(key.Folder) : _files.GetDirectories(key.Folder)).ToArray();
+        }
+        catch (Exception ex) when (ex is IOException or UnauthorizedAccessException)
+        {
+            // Nothing listed, nothing found.
+        }
+        return entries.ToLookup(entry => Path.GetFileName(entry), StringComparer.OrdinalIgnoreCase);
+    }
+}

StarterNG/Infrastructure/LoadingScreen.cs

@@ -5,16 +5,21 @@ using System.Runtime.InteropServices;
 using Avalonia;
 using Avalonia.Media.Imaging;
 using Avalonia.Platform;
+using StarterNG.Application.Abstractions;
+using StarterNG.Infrastructure.Adapters;
 
 namespace StarterNG.Infrastructure;
 
 public static class LoadingScreen
 {
+    private static readonly string[] Extensions = { ".bmp", ".jpg", ".jpeg", ".png" };
+
     public static void Prepare(string? logoKey, string? sceneryName = null)
     {
         try
         {
-            string? src = ResolveSource(logoKey) ?? ResolveSource(sceneryName) ?? PickRandom();
+            string? src = FindSource(new PhysicalFileSystem(), Directory.GetCurrentDirectory(), logoKey, sceneryName,
+                                     Random.Shared);
             if (src is null) return;
 
             string destDir = Path.Combine(Directory.GetCurrentDirectory(), "textures");
@@ -35,32 +40,36 @@ public static class LoadingScreen
         }
     }
 
-    private static string? ResolveSource(string? key)
+    /// <summary>
+    /// The picture of textures/logo under <paramref name="root"/> to show: the trainset's,
+    /// else the scenery's, else one of logo*.* at random; its name and extension in any
+    /// letter case. Null when there is none.
+    /// </summary>
+    public static string? FindSource(IFileSystem files, string root, string? logoKey, string? sceneryName,
+                                     Random random)
+    {
+        var names = new CaseInsensitivePaths(files);
+        if (names.Find(root, "textures/logo", directory: true) is not { } dir)
+            return null;
+        return Named(names, dir, logoKey) ?? Named(names, dir, sceneryName) ?? PickRandom(files, dir, random);
+    }
+
+    private static string? Named(CaseInsensitivePaths names, string dir, string? key)
     {
         if (string.IsNullOrWhiteSpace(key)) return null;
         key = Path.GetFileNameWithoutExtension(key.Trim());
-        string dir = Path.Combine(Directory.GetCurrentDirectory(), "textures", "logo");
-        foreach (string ext in new[] { ".bmp", ".jpg", ".jpeg", ".png" })
-        {
-            string path = Path.Combine(dir, key + ext);
-            if (File.Exists(path)) return path;
-        }
-        return null;
+        if (key.Length == 0) return null;
+        return Extensions.Select(ext => names.Find(dir, key + ext)).FirstOrDefault(path => path is not null);
     }
 
-    private static string? PickRandom()
+    private static string? PickRandom(IFileSystem files, string dir, Random random)
     {
-        string dir = Path.Combine(Directory.GetCurrentDirectory(), "textures", "logo");
-        if (!Directory.Exists(dir)) return null;
-        var files = Directory.GetFiles(dir, "logo*.*")
-            .Where(f =>
-            {
-                string e = Path.GetExtension(f).ToLowerInvariant();
-                return e is ".bmp" or ".jpg" or ".jpeg" or ".png";
-            })
+        var logos = files.GetFiles(dir, "logo*.*")
+            .Where(f => Extensions.Contains(Path.GetExtension(f), StringComparer.OrdinalIgnoreCase))
+            .Order(StringComparer.Ordinal)
             .ToArray();
-        if (files.Length == 0) return null;
-        return files[Random.Shared.Next(files.Length)];
+        if (logos.Length == 0) return null;
+        return logos[random.Next(logos.Length)];
     }
 
     private static void WriteBmp(string sourcePath, string destPath)

StarterNG/Infrastructure/Sceneries/AttachmentLocator.cs

@@ -0,0 +1,24 @@
+using StarterNG.Application.Abstractions;
+using StarterNG.Domain.Sceneries;
+
+namespace StarterNG.Infrastructure.Sceneries;
+
+/// <summary>Where the file a scenery attaches (<c>//$f</c>) is on disk.</summary>
+public sealed class AttachmentLocator
+{
+    private readonly IGamePaths _paths;
+    private readonly CaseInsensitivePaths _names;
+
+    public AttachmentLocator(IFileSystem files, IGamePaths paths)
+    {
+        _paths = paths;
+        _names = new CaseInsensitivePaths(files);
+    }
+
+    /// <summary>
+    /// The attachment's file, named from the game's folder or in full, with its letters
+    /// as on disk; null when it is not there.
+    /// </summary>
+    public string? Resolve(SceneryAttachment attachment) =>
+        string.IsNullOrWhiteSpace(attachment.FilePath) ? null : _names.Find(_paths.Root, attachment.FilePath.Trim());
+}

StarterNG/Infrastructure/Sceneries/SceneryImageLocator.cs

@@ -1,5 +1,6 @@
 using System.Collections.Generic;
 using System.IO;
+using System.Linq;
 using StarterNG.Application.Abstractions;
 using StarterNG.Domain.Sceneries;
 
@@ -8,11 +9,13 @@ namespace StarterNG.Infrastructure.Sceneries;
 public sealed class SceneryImageLocator
 {
     private readonly IFileSystem _files;
+    private readonly CaseInsensitivePaths _names;
     private readonly Dictionary<string, string?> _cache = new();
 
     public SceneryImageLocator(IFileSystem files)
     {
         _files = files;
+        _names = new CaseInsensitivePaths(files);
     }
 
     public string? Resolve(Scenery scenery)
@@ -34,22 +37,23 @@ public sealed class SceneryImageLocator
             return null;
 
         string name = scenery.ImageName.Replace('\\', '/').Trim();
+        if (Path.IsPathFullyQualified(name))
+            return _names.Find("", name);
+        if (_files.FileExists(name))
+            return name;
+
         string sceneryDir = Path.GetDirectoryName(scenery.Path) ?? ".";
         string root = Path.GetDirectoryName(sceneryDir) ?? ".";
 
-        string[] candidates =
+        (string Folder, string Name)[] candidates =
         {
-            name,
-            Path.Combine(root, name),
-            Path.Combine(sceneryDir, name),
-            Path.Combine(sceneryDir, "images", name),
-            Path.Combine(root, "scenery", "images", name)
+            (root, name),
+            (sceneryDir, name),
+            (sceneryDir, "images/" + name),
+            (root, "scenery/images/" + name)
         };
 
-        foreach (string candidate in candidates)
-            if (_files.FileExists(candidate))
-                return candidate;
-
-        return null;
+        return candidates.Select(candidate => _names.Find(candidate.Folder, candidate.Name))
+                         .FirstOrDefault(found => found is not null);
     }
 }

StarterNG/Infrastructure/Sceneries/SceneryParser.cs

@@ -20,11 +20,11 @@ public sealed class SceneryParser
         _random = random;
     }
 
-    /// <param name="findInclude">
-    /// What the simulator makes of an include, as the include names it; null leaves
+    /// <param name="opensInclude">
+    /// Whether the simulator opens an include, as the include names it; null leaves
     /// includes unchecked.
     /// </param>
-    public Scenery Parse(string path, string content, Func<string, IncludeLookup>? findInclude = null)
+    public Scenery Parse(string path, string content, Func<string, bool>? opensInclude = null)
     {
         string original = content;
 
@@ -38,7 +38,7 @@ public sealed class SceneryParser
 
         // Read from the text with its optional includes blanked, which keeps every
         // place where it was, so a fault's line is the line in the file.
-        var syntax = ScenerySyntax.Scan(content, System.IO.Path.GetFileName(path), findInclude);
+        var syntax = ScenerySyntax.Scan(content, System.IO.Path.GetFileName(path), opensInclude);
         var faults = syntax.Faults.ToList();
         var inlined = SceneryIncludes.Ranges(content);
 

StarterNG/Infrastructure/Sceneries/SceneryRepository.cs

@@ -23,7 +23,7 @@ public sealed class SceneryRepository : ISceneryRepository
     private readonly SceneryParser _parser;
 
     /// <summary>The scenery folders' files and folders, listed once per load of them all.</summary>
-    private readonly ConcurrentDictionary<(string, bool), IReadOnlyList<string>> _listings = new();
+    private readonly CaseInsensitivePaths _names;
 
     public SceneryRepository(IFileSystem files, IGamePaths paths, IDiagnosticsLog log, SceneryParser parser)
     {
@@ -31,11 +31,12 @@ public sealed class SceneryRepository : ISceneryRepository
         _paths = paths;
         _log = log;
         _parser = parser;
+        _names = new CaseInsensitivePaths(files, keepListings: true);
     }
 
     public IReadOnlyList<Scenery> LoadAll(IProgress<SceneryLoadProgress>? progress = null)
     {
-        _listings.Clear();
+        _names.Forget();
         var files = SceneryFiles().ToList();
         var loaded = new ConcurrentBag<Scenery>();
         int total = Math.Max(1, files.Count);
@@ -58,7 +59,7 @@ public sealed class SceneryRepository : ISceneryRepository
 
     public Scenery? Load(string path)
     {
-        _listings.Clear();
+        _names.Forget();
         return LoadOne(path);
     }
 
@@ -79,10 +80,8 @@ public sealed class SceneryRepository : ISceneryRepository
             // With its own .sbt the scenery's terrain comes from it, and the simulator
             // passes its terrain includes over without opening them.
             bool binaryTerrain = Opens(Path.GetFileNameWithoutExtension(path) + ".sbt");
-            IncludeLookup FindInclude(string name) =>
-                Opens(name) || (binaryTerrain && SimulatorNames.Lower(name).Contains("_ter.scm"))
-                    ? new IncludeLookup(true)
-                    : new IncludeLookup(false, ResolveInclude(name));
+            bool OpensInclude(string name) =>
+                Opens(name) || (binaryTerrain && SimulatorNames.Lower(name).Contains("_ter.scm"));
 
             (string File, string Text)? ReadInclude(string name)
             {
@@ -99,7 +98,7 @@ public sealed class SceneryRepository : ISceneryRepository
 
             string own = LegacyText.Decode(_files.ReadAllBytes(path), out var ownEncoding);
             string text = SceneryIncludes.Inline(own, ReadInclude);
-            var scenery = _parser.Parse(path, text, FindInclude);
+            var scenery = _parser.Parse(path, text, OpensInclude);
             scenery.HasCompanionTimetable = binaryTerrain;
             scenery.Sources = sources;
             scenery.TextEncoding = ownEncoding;
@@ -114,11 +113,11 @@ public sealed class SceneryRepository : ISceneryRepository
     }
 
     /// <summary>
-    /// Whether the simulator opens a file of the scenery folder named so: by the
-    /// name in lower case, which on Linux has to be how it is named on disk.
+    /// Whether the simulator opens a file of the scenery folder named so: whatever the
+    /// case of its letters, on Linux too. A shade more lenient than eu07 there, which
+    /// folds only the letters A to Z and of two folders named alike takes the first.
     /// </summary>
-    private bool Opens(string name) =>
-        _files.FileExists(Path.Combine(_paths.Scenery, SimulatorNames.Lower(name.Replace('\\', '/'))));
+    private bool Opens(string name) => ResolveInclude(name) is not null;
 
     /// <summary>
     /// An include's file as it is named on disk, from the scenery folder, whatever
@@ -126,44 +125,7 @@ public sealed class SceneryRepository : ISceneryRepository
     /// copy written for a start carries in place of the include, so they come along
     /// on Linux too.
     /// </summary>
-    private string? ResolveInclude(string name)
-    {
-        string relative = name.Replace('\\', '/');
-        if (_files.FileExists(Path.Combine(_paths.Scenery, relative)))
-            return relative;
-
-        string[] parts = relative.Split('/', StringSplitOptions.RemoveEmptyEntries);
-        string directory = _paths.Scenery;
-        var found = new List<string>();
-        for (int i = 0; i < parts.Length; i++)
-        {
-            if (parts[i] is "." or "..")
-            {
-                directory = Path.Combine(directory, parts[i]);
-                found.Add(parts[i]);
-                continue;
-            }
-
-            bool last = i == parts.Length - 1;
-            string? match = Listing(directory, last)
-                .FirstOrDefault(entry => string.Equals(Path.GetFileName(entry), parts[i],
-                                                       StringComparison.OrdinalIgnoreCase));
-            if (match is null)
-                return null;
-            directory = match;
-            found.Add(Path.GetFileName(match));
-        }
-
-        return string.Join('/', found);
-    }
-
-    private IReadOnlyList<string> Listing(string directory, bool files) =>
-        _listings.GetOrAdd((directory, files), key =>
-        {
-            if (!_files.DirectoryExists(key.Item1))
-                return Array.Empty<string>();
-            return key.Item2 ? _files.GetFiles(key.Item1) : _files.GetDirectories(key.Item1);
-        });
+    private string? ResolveInclude(string name) => _names.Resolve(_paths.Scenery, name);
 
     private IEnumerable<string> SceneryFiles() =>
         _files.GetFiles(_paths.Scenery, "*.scn")

StarterNG/Infrastructure/Sceneries/SceneryTranslations.cs

@@ -14,12 +14,14 @@ public sealed class SceneryTranslations : ISceneryTranslations
     private const string BaseLanguage = "en";
 
     private readonly IFileSystem _files;
+    private readonly CaseInsensitivePaths _names;
     private readonly IDiagnosticsLog _log;
     private readonly Dictionary<string, string> _map = new(StringComparer.OrdinalIgnoreCase);
 
     public SceneryTranslations(IFileSystem files, IDiagnosticsLog log)
     {
         _files = files;
+        _names = new CaseInsensitivePaths(files);
         _log = log;
     }
 
@@ -29,12 +31,11 @@ public sealed class SceneryTranslations : ISceneryTranslations
 
         string sceneryDir = Path.GetDirectoryName(Path.GetFullPath(scenery.Path)) ?? "scenery";
         string id = Path.GetFileNameWithoutExtension(scenery.Path);
-        string i18nDir = Path.Combine(sceneryDir, "i18n");
         string language = NormalizeLanguage(langCode);
 
-        TryLoad(Path.Combine(i18nDir, $"{id}_{BaseLanguage}.json"));
+        TryLoad(_names.Find(sceneryDir, $"i18n/{id}_{BaseLanguage}.json"));
         if (!string.Equals(language, BaseLanguage, StringComparison.OrdinalIgnoreCase))
-            TryLoad(Path.Combine(i18nDir, $"{id}_{language}.json"));
+            TryLoad(_names.Find(sceneryDir, $"i18n/{id}_{language}.json"));
     }
 
     public string Translate(string? text)
@@ -50,9 +51,9 @@ public sealed class SceneryTranslations : ISceneryTranslations
         return _map.TryGetValue(key, out string? translated) ? translated : text;
     }
 
-    private void TryLoad(string path)
+    private void TryLoad(string? path)
     {
-        if (!_files.FileExists(path))
+        if (path is null)
             return;
 
         try

StarterNG/Infrastructure/Sceneries/TimetableLocator.cs

@@ -17,10 +17,12 @@ public sealed class TimetableLocator
                                                    RegexOptions.Multiline | RegexOptions.IgnoreCase);
 
     private readonly IFileSystem _files;
+    private readonly CaseInsensitivePaths _names;
 
     public TimetableLocator(IFileSystem files)
     {
         _files = files;
+        _names = new CaseInsensitivePaths(files);
     }
 
     public string? Resolve(Scenery scenery, string? name)
@@ -30,17 +32,19 @@ public sealed class TimetableLocator
 
         string sceneryDir = Path.GetDirectoryName(scenery.Path) ?? ".";
         string root = Path.GetDirectoryName(sceneryDir) ?? ".";
+        name = name.Replace('\\', '/');
 
-        string[] candidates =
+        (string Folder, string Name)[] candidates =
         {
-            Path.Combine(root, "timetables", name + ".txt"),
-            Path.Combine(sceneryDir, name + ".txt"),
-            Path.Combine(root, "scenario", name + ".txt"),
-            Path.Combine(root, "timetables", name),
-            Path.Combine(sceneryDir, name)
+            (root, "timetables/" + name + ".txt"),
+            (sceneryDir, name + ".txt"),
+            (root, "scenario/" + name + ".txt"),
+            (root, "timetables/" + name),
+            (sceneryDir, name)
         };
 
-        return candidates.FirstOrDefault(_files.FileExists);
+        return candidates.Select(candidate => _names.Find(candidate.Folder, candidate.Name))
+                         .FirstOrDefault(found => found is not null);
     }
 
     /// <summary>The number the timetable gives its train; null with no timetable or no such heading in it.</summary>

StarterNG/Infrastructure/Vehicles/FizPhysicsRepository.cs

@@ -23,6 +23,7 @@ public sealed class FizPhysicsRepository : IPhysicsRepository
     };
 
     private readonly IFileSystem _files;
+    private readonly CaseInsensitivePaths _names;
     private readonly IGamePaths _paths;
     private readonly IDiagnosticsLog _log;
 
@@ -38,6 +39,7 @@ public sealed class FizPhysicsRepository : IPhysicsRepository
     public FizPhysicsRepository(IFileSystem files, IGamePaths paths, IDiagnosticsLog log)
     {
         _files = files;
+        _names = new CaseInsensitivePaths(files);
         _paths = paths;
         _log = log;
     }
@@ -51,7 +53,7 @@ public sealed class FizPhysicsRepository : IPhysicsRepository
         if (string.IsNullOrEmpty(model))
             return null;
 
-        string name = Path.GetFileNameWithoutExtension(model);
+        string name = Path.GetFileName(model);
         if (name.Length == 0)
             return null;
 
@@ -60,7 +62,10 @@ public sealed class FizPhysicsRepository : IPhysicsRepository
         if (_cache.TryGetValue(key, out var cached))
             return cached;
 
-        var physics = Read(folder, name);
+        // The name as written first: in 9-107.13 the dot is part of the name, not an extension.
+        string bare = Path.GetFileNameWithoutExtension(name);
+        var physics = Read(folder, name)
+            ?? (bare.Length > 0 && bare != name ? Read(folder, bare) : null);
         _cache[key] = physics;
         return physics;
     }
@@ -162,8 +167,9 @@ public sealed class FizPhysicsRepository : IPhysicsRepository
                 while (i < tokens.Count && !tokens[i].Equals("end", StringComparison.OrdinalIgnoreCase))
                     includeParameters.Add(Resolve(tokens[i++], parameters));
 
-                Parse(physics, Path.Combine(directory, includeFile), directory, includeParameters.ToArray(),
-                      depth + 1);
+                // Named in the letter case of whoever wrote the include, not always that of the file.
+                string included = _names.Find(directory, includeFile) ?? Path.Combine(directory, includeFile);
+                Parse(physics, included, directory, includeParameters.ToArray(), depth + 1);
                 pendingKey = null;
                 continue;
             }

StarterNG/Infrastructure/Vehicles/MissingAssetScanner.cs

@@ -10,44 +10,53 @@ public sealed class MissingAssetScanner
     private static readonly string[] TextureExtensions = { ".mat", ".bmp" };
     private static readonly string[] ModelExtensions = { ".t3d", ".e3d" };
 
-    private readonly IFileSystem _files;
     private readonly IGamePaths _paths;
+    private readonly CaseInsensitivePaths _names;
 
     public MissingAssetScanner(IFileSystem files, IGamePaths paths)
     {
-        _files = files;
         _paths = paths;
+        _names = new CaseInsensitivePaths(files, keepListings: true);
     }
 
     public List<string> Scan(VehicleCatalog catalog)
     {
         var lines = new List<string>();
-
-        foreach (var texture in catalog.Textures)
+        try
         {
-            string directory = Path.Combine(
-                _paths.Dynamic,
-                texture.Directory.Replace('/', Path.DirectorySeparatorChar).TrimEnd('\\', '/'));
+            foreach (var texture in catalog.Textures)
+            {
+                string directory = texture.Directory.Replace('\\', '/').TrimEnd('/');
 
-            if (!string.IsNullOrEmpty(texture.Skinfile) &&
-                !ExistsWithAnyExtension(Path.Combine(directory, texture.Skinfile), TextureExtensions))
-                lines.Add($"# no file: {texture.Directory}{texture.Skinfile}");
+                if (!string.IsNullOrEmpty(texture.Skinfile) &&
+                    !ExistsWithAnyExtension(Under(directory, texture.Skinfile), TextureExtensions))
+                    lines.Add($"# no file: {texture.Directory}{texture.Skinfile}");
 
-            if (!string.IsNullOrEmpty(texture.Model) &&
-                !ExistsWithAnyExtension(Path.Combine(directory, texture.Model), ModelExtensions))
-                lines.Add($"# no model: {texture.Directory}{texture.Model}");
+                if (!string.IsNullOrEmpty(texture.Model) &&
+                    !ExistsWithAnyExtension(Under(directory, texture.Model), ModelExtensions))
+                    lines.Add($"# no model: {texture.Directory}{texture.Model}");
+            }
+        }
+        finally
+        {
+            // The folders are listed once for the whole catalog, and not kept past it.
+            _names.Forget();
         }
 
         return lines;
     }
 
-    private bool ExistsWithAnyExtension(string path, string[] extensions)
+    private static string Under(string directory, string name) =>
+        directory.Length == 0 ? name : directory + "/" + name;
+
+    /// <summary>Whether the file is under dynamic as named, or with one of the extensions, in any letter case.</summary>
+    private bool ExistsWithAnyExtension(string name, string[] extensions)
     {
-        if (_files.FileExists(path))
+        if (_names.Resolve(_paths.Dynamic, name) is not null)
             return true;
 
         foreach (string extension in extensions)
-            if (_files.FileExists(Path.ChangeExtension(path, extension)))
+            if (_names.Resolve(_paths.Dynamic, Path.ChangeExtension(name, extension)) is not null)
                 return true;
 
         return false;

StarterNG/Infrastructure/Vehicles/TextureFolder.cs

@@ -0,0 +1,24 @@
+using System.IO;
+using StarterNG.Application.Abstractions;
+using StarterNG.Domain.Vehicles;
+
+namespace StarterNG.Infrastructure.Vehicles;
+
+public static class TextureFolder
+{
+    /// <summary>
+    /// A livery's folder as it is named on disk: under dynamic, or from the game's folder
+    /// when its name starts there, in any letter case. Where it would be when it is not there.
+    /// </summary>
+    public static string Of(IFileSystem files, IGamePaths paths, VehicleTexture texture)
+    {
+        string directory = texture.Directory.Replace('\\', '/').TrimEnd('/');
+        if (directory.Length == 0)
+            return paths.Dynamic;
+
+        var names = new CaseInsensitivePaths(files);
+        return names.Find(paths.Dynamic, directory, directory: true) ??
+               names.Find(paths.Root, directory, directory: true) ??
+               Path.Combine(paths.Root, directory.Replace('/', Path.DirectorySeparatorChar));
+    }
+}

StarterNG/MainWindow.axaml.cs

@@ -46,6 +46,9 @@ public partial class MainWindow : Window
     {
         Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
         InitializeComponent();
+        // The top bar lets the version go first when it runs short of room, which at the usual widths it does;
+        // the title has room for it at any width.
+        Title = $"{Title} {AppInfo.Version}";
 
         ExtendClientAreaToDecorationsHint = true;
         ExtendClientAreaTitleBarHeightHint = TitleBarHeight;

StarterNG/StarterNG.csproj

@@ -12,7 +12,7 @@
         <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
         <!-- Major and minor only: CI adds the patch, the number of commits, so every
              build of main is a higher version without anyone bumping it. -->
-        <VersionPrefix>1.5</VersionPrefix>
+        <VersionPrefix>1.6</VersionPrefix>
         <AssemblyName>Starter</AssemblyName>
         <Company>eu07.pl</Company>
     </PropertyGroup>

StarterNG/Views/Depot/TextureMenuItems.cs

@@ -1,8 +1,10 @@
 using System.IO;
 using Avalonia.Controls;
 using Avalonia.Input.Platform;
+using StarterNG.Application;
 using StarterNG.Domain;
 using StarterNG.Domain.Vehicles;
+using StarterNG.Infrastructure.Vehicles;
 
 namespace StarterNG.Views;
 
@@ -17,13 +19,7 @@ internal static class TextureMenuItems
             if (TopLevel.GetTopLevel(owner)?.Clipboard is { } clipboard)
                 await clipboard.SetTextAsync(Consist.Base(texture.Skinfile));
         });
-        menu.AddItem(App.Loc["OpenTextureFolder"], () => Infrastructure.Diagnostics.OpenOrReport(FolderOf(texture)));
-    }
-
-    private static string FolderOf(VehicleTexture texture)
-    {
-        string dir = Path.Combine(Directory.GetCurrentDirectory(), "dynamic",
-            texture.Directory.Replace('/', Path.DirectorySeparatorChar).TrimEnd('\\', '/'));
-        return Directory.Exists(dir) ? dir : Path.Combine(Directory.GetCurrentDirectory(), texture.Directory);
+        menu.AddItem(App.Loc["OpenTextureFolder"], () => Infrastructure.Diagnostics.OpenOrReport(
+            Path.GetFullPath(TextureFolder.Of(AppServices.Current.Files, AppServices.Current.Paths, texture))));
     }
 }

StarterNG/Views/Scenarios.axaml.cs

@@ -492,20 +492,18 @@ public partial class Scenarios : UserControl
             btn.Classes.Add("Flat");
             ToolTip.SetTip(btn, att.FilePath);
             // A button that does nothing is no way to say the file is not there.
-            btn.IsEnabled = File.Exists(Path.GetFullPath(att.FilePath));
+            btn.IsEnabled = AppServices.Current.Attachments.Resolve(att) is not null;
             ToolTip.SetShowOnDisabled(btn, true);
-            btn.Click += (_, _) => OpenAttachment(att.FilePath);
+            btn.Click += (_, _) => OpenAttachment(att);
             attachmentsPanel.Children.Add(btn);
         }
     }
 
-    private static void OpenAttachment(string relativePath)
+    private static void OpenAttachment(SceneryAttachment attachment)
     {
-        string full = Path.GetFullPath(relativePath);
-        if (!File.Exists(full))
-            full = Path.GetFullPath(Path.Combine(Directory.GetCurrentDirectory(), relativePath));
-        if (!File.Exists(full))
+        if (AppServices.Current.Attachments.Resolve(attachment) is not { } found)
             return;
+        string full = Path.GetFullPath(found);
         try
         {
             Process.Start(new ProcessStartInfo(full) { UseShellExecute = true });

StarterNG/startercfg/lang/cz.xml

@@ -742,7 +742,6 @@
     <String key="SyntaxVehicleOutsideTrainset">Vozidlo {0} stojí mimo soupravu: chybí záhlaví trainset?</String>
     <String key="SyntaxNotANumber">{0}: „{1}“ místo čísla</String>
     <String key="SyntaxMissingInclude">Soubor {1} nenalezen (include)</String>
-    <String key="SyntaxIncludeLetterCase">Soubor {1} je na disku jako {0}: linuxový eu07 ho nenačte</String>
     <String key="SyntaxIncludeNotClosed">include {1} bez end</String>
     <String key="SyntaxTrainsetUnreadable">Soupravu {0} se nepodařilo načíst</String>
     <String key="SyntaxVehicleUnreadable">Vozidlo {0} se nepodařilo načíst</String>

StarterNG/startercfg/lang/en.xml

@@ -772,7 +772,6 @@
     <String key="SyntaxVehicleOutsideTrainset">Vehicle {0} stands outside a trainset: header missing?</String>
     <String key="SyntaxNotANumber">{0}: “{1}” instead of a number</String>
     <String key="SyntaxMissingInclude">File {1} not found (include)</String>
-    <String key="SyntaxIncludeLetterCase">File {1} is on disk as {0}: the Linux eu07 will not load it</String>
     <String key="SyntaxIncludeNotClosed">include {1} without end</String>
     <String key="SyntaxTrainsetUnreadable">Trainset {0} could not be read</String>
     <String key="SyntaxVehicleUnreadable">Vehicle {0} could not be read</String>

StarterNG/startercfg/lang/hu.xml

@@ -742,7 +742,6 @@
     <String key="SyntaxVehicleOutsideTrainset">A(z) {0} jármű szerelvényen kívül áll: hiányzik a trainset fejléc?</String>
     <String key="SyntaxNotANumber">{0}: „{1}” szám helyett</String>
     <String key="SyntaxMissingInclude">A(z) {1} fájl nem található (include)</String>
-    <String key="SyntaxIncludeLetterCase">A(z) {1} fájl a lemezen {0} néven van: a linuxos eu07 nem tölti be</String>
     <String key="SyntaxIncludeNotClosed">include {1} end nélkül</String>
     <String key="SyntaxTrainsetUnreadable">A(z) {0} szerelvényt nem sikerült beolvasni</String>
     <String key="SyntaxVehicleUnreadable">A(z) {0} járművet nem sikerült beolvasni</String>

StarterNG/startercfg/lang/pl.xml

@@ -769,7 +769,6 @@
     <String key="SyntaxVehicleOutsideTrainset">Pojazd {0} stoi poza składem: brak nagłówka trainset?</String>
     <String key="SyntaxNotANumber">{0}: „{1}” zamiast liczby</String>
     <String key="SyntaxMissingInclude">Brak pliku {1} (include)</String>
-    <String key="SyntaxIncludeLetterCase">Plik {1} jest na dysku jako {0}: linuksowy eu07 go nie wczyta</String>
     <String key="SyntaxIncludeNotClosed">include {1} bez end</String>
     <String key="SyntaxTrainsetUnreadable">Nie udało się odczytać składu {0}</String>
     <String key="SyntaxVehicleUnreadable">Nie udało się odczytać pojazdu {0}</String>

StarterNG/startercfg/lang/ru.xml

@@ -742,7 +742,6 @@
     <String key="SyntaxVehicleOutsideTrainset">Транспорт {0} стоит вне состава: нет заголовка trainset?</String>
     <String key="SyntaxNotANumber">{0}: «{1}» вместо числа</String>
     <String key="SyntaxMissingInclude">Файл {1} не найден (include)</String>
-    <String key="SyntaxIncludeLetterCase">Файл {1} на диске назван {0}: eu07 на Linux его не загрузит</String>
     <String key="SyntaxIncludeNotClosed">include {1} без end</String>
     <String key="SyntaxTrainsetUnreadable">Не удалось прочитать состав {0}</String>
     <String key="SyntaxVehicleUnreadable">Не удалось прочитать единицу {0}</String>