Handle dotfiles and empty strings in identifier generation

src/Directory.Build.props

@@ -2,7 +2,7 @@
 <Project>
   <PropertyGroup>
     <NoWarn>CS1591;NU1608;NU1109;RS2008;RS1041</NoWarn>
-    <Version>0.4.0</Version>
+    <Version>0.5.0</Version>
     <LangVersion>preview</LangVersion>
     <AssemblyVersion>1.0.0</AssemblyVersion>
     <ResolveAssemblyReferencesSilent>true</ResolveAssemblyReferencesSilent>
@@ -11,4 +11,4 @@
     <SuppressNETCoreSdkPreviewMessage>true</SuppressNETCoreSdkPreviewMessage>
     <Description>A C# source generator that provides strongly-typed, compile-time access to project files marked with CopyToOutputDirectory in the .csproj file.</Description>
   </PropertyGroup>
-</Project>
+</Project>

src/ProjectFiles/Generator.cs

@@ -339,6 +339,13 @@ static string ToFilePropertyName(string filePath)
         var nameWithoutExtension = Path.GetFileNameWithoutExtension(filePath);
         var extension = Path.GetExtension(filePath);
 
+        // Handle files that start with a dot (like ".txt")
+        if (string.IsNullOrEmpty(nameWithoutExtension) && !string.IsNullOrEmpty(extension))
+        {
+            var fileName = Path.GetFileName(filePath);
+            return Identifier.Build(fileName);
+        }
+
         var propertyName = Identifier.Build(nameWithoutExtension);
 
         if (!string.IsNullOrEmpty(extension))

src/ProjectFiles/Identifier.cs

@@ -2,6 +2,11 @@ public static class Identifier
 {
     public static string Build(string name)
     {
+        if (name.Length == 0)
+        {
+            return "_";
+        }
+
         var builder = new StringBuilder(name.Length + 1);
         var first = name[0];
         if (char.IsLetter(first) || first == '_')

src/Tests/GeneratorTest.DotFileAtRoot#ProjectFiles.ProjectDirectory.g.verified.cs

@@ -0,0 +1,34 @@
+//HintName: ProjectFiles.ProjectDirectory.g.cs
+namespace ProjectFilesGenerator;
+
+using System.IO;
+using System.Collections.Generic;
+
+partial class ProjectDirectory(string path)
+{
+    public string Path { get; } = path;
+
+    public string FullPath => System.IO.Path.GetFullPath(Path);
+
+    public override string ToString() => Path;
+
+    public static implicit operator string(ProjectDirectory temp) =>
+        temp.Path;
+
+    public static implicit operator FileInfo(ProjectDirectory temp) =>
+        new(temp.Path);
+
+    public IEnumerable<string> EnumerateDirectories() =>
+        Directory.EnumerateDirectories(Path);
+
+    public IEnumerable<string> EnumerateFiles() =>
+        Directory.EnumerateFiles(Path);
+
+    public IEnumerable<string> GetFiles() =>
+        Directory.GetFiles(Path);
+
+    public IEnumerable<string> GetDirectories() =>
+        Directory.GetDirectories(Path);
+
+    public DirectoryInfo Info => new(Path);
+}

src/Tests/GeneratorTest.DotFileAtRoot#ProjectFiles.ProjectFile.g.verified.cs

@@ -0,0 +1,50 @@
+//HintName: ProjectFiles.ProjectFile.g.cs
+namespace ProjectFilesGenerator;
+
+using System.IO;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+
+partial class ProjectFile(string path)
+{
+    public string Path { get; } = path;
+
+    public string FullPath => System.IO.Path.GetFullPath(Path);
+
+    public override string ToString() => Path;
+
+    public static implicit operator string(ProjectFile temp) =>
+        temp.Path;
+
+    public static implicit operator FileInfo(ProjectFile temp) =>
+        new(temp.Path);
+
+    public FileStream OpenRead() =>
+        File.OpenRead(Path);
+
+    public StreamReader OpenText() =>
+        File.OpenText(Path);
+
+    public string ReadAllText() =>
+        File.ReadAllText(Path);
+
+    public string ReadAllText(Encoding encoding) =>
+        File.ReadAllText(Path, encoding);
+
+    public FileInfo Info => new(Path);
+
+#if NETSTANDARD2_1_OR_GREATER || NETCOREAPP2_0_OR_GREATER
+    public Task<string> ReadAllTextAsync(CancellationToken cancel = default) =>
+        File.ReadAllTextAsync(Path, cancel);
+
+    public Task<string> ReadAllTextAsync(Encoding encoding, CancellationToken cancel = default) =>
+        File.ReadAllTextAsync(Path, encoding,cancel);
+#else
+    public Task<string> ReadAllTextAsync(CancellationToken cancel = default) =>
+        Task.FromResult(File.ReadAllText(Path));
+
+    public Task<string> ReadAllTextAsync(Encoding encoding, CancellationToken cancel = default) =>
+        Task.FromResult(File.ReadAllText(Path, encoding));
+#endif
+}

src/Tests/GeneratorTest.DotFileAtRoot#ProjectFiles.g.verified.cs

@@ -0,0 +1,18 @@
+//HintName: ProjectFiles.g.cs
+// <auto-generated/>
+#nullable enable
+
+namespace ProjectFilesGenerator
+{
+    using ProjectFilesGenerator.Types;
+
+    /// <summary>Provides strongly-typed access to project files marked with CopyToOutputDirectory.</summary>
+    static partial class ProjectFiles
+    {
+        public static ProjectFile _txt { get; } = new(".txt");
+    }
+}
+
+namespace ProjectFilesGenerator.Types
+{
+}

src/Tests/GeneratorTest.DotFileInDirectory#ProjectFiles.ProjectDirectory.g.verified.cs

@@ -0,0 +1,34 @@
+//HintName: ProjectFiles.ProjectDirectory.g.cs
+namespace ProjectFilesGenerator;
+
+using System.IO;
+using System.Collections.Generic;
+
+partial class ProjectDirectory(string path)
+{
+    public string Path { get; } = path;
+
+    public string FullPath => System.IO.Path.GetFullPath(Path);
+
+    public override string ToString() => Path;
+
+    public static implicit operator string(ProjectDirectory temp) =>
+        temp.Path;
+
+    public static implicit operator FileInfo(ProjectDirectory temp) =>
+        new(temp.Path);
+
+    public IEnumerable<string> EnumerateDirectories() =>
+        Directory.EnumerateDirectories(Path);
+
+    public IEnumerable<string> EnumerateFiles() =>
+        Directory.EnumerateFiles(Path);
+
+    public IEnumerable<string> GetFiles() =>
+        Directory.GetFiles(Path);
+
+    public IEnumerable<string> GetDirectories() =>
+        Directory.GetDirectories(Path);
+
+    public DirectoryInfo Info => new(Path);
+}

src/Tests/GeneratorTest.DotFileInDirectory#ProjectFiles.ProjectFile.g.verified.cs

@@ -0,0 +1,50 @@
+//HintName: ProjectFiles.ProjectFile.g.cs
+namespace ProjectFilesGenerator;
+
+using System.IO;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+
+partial class ProjectFile(string path)
+{
+    public string Path { get; } = path;
+
+    public string FullPath => System.IO.Path.GetFullPath(Path);
+
+    public override string ToString() => Path;
+
+    public static implicit operator string(ProjectFile temp) =>
+        temp.Path;
+
+    public static implicit operator FileInfo(ProjectFile temp) =>
+        new(temp.Path);
+
+    public FileStream OpenRead() =>
+        File.OpenRead(Path);
+
+    public StreamReader OpenText() =>
+        File.OpenText(Path);
+
+    public string ReadAllText() =>
+        File.ReadAllText(Path);
+
+    public string ReadAllText(Encoding encoding) =>
+        File.ReadAllText(Path, encoding);
+
+    public FileInfo Info => new(Path);
+
+#if NETSTANDARD2_1_OR_GREATER || NETCOREAPP2_0_OR_GREATER
+    public Task<string> ReadAllTextAsync(CancellationToken cancel = default) =>
+        File.ReadAllTextAsync(Path, cancel);
+
+    public Task<string> ReadAllTextAsync(Encoding encoding, CancellationToken cancel = default) =>
+        File.ReadAllTextAsync(Path, encoding,cancel);
+#else
+    public Task<string> ReadAllTextAsync(CancellationToken cancel = default) =>
+        Task.FromResult(File.ReadAllText(Path));
+
+    public Task<string> ReadAllTextAsync(Encoding encoding, CancellationToken cancel = default) =>
+        Task.FromResult(File.ReadAllText(Path, encoding));
+#endif
+}

src/Tests/GeneratorTest.DotFileInDirectory#ProjectFiles.g.verified.cs

@@ -0,0 +1,22 @@
+//HintName: ProjectFiles.g.cs
+// <auto-generated/>
+#nullable enable
+
+namespace ProjectFilesGenerator
+{
+    using ProjectFilesGenerator.Types;
+
+    /// <summary>Provides strongly-typed access to project files marked with CopyToOutputDirectory.</summary>
+    static partial class ProjectFiles
+    {
+        public static ConfigType Config { get; } = new();
+    }
+}
+
+namespace ProjectFilesGenerator.Types
+{
+partial class ConfigType() : ProjectDirectory("Config")
+{
+    public ProjectFile _env { get; } = new("Config/.env");
+}
+}

src/Tests/GeneratorTest.MultipleDotFilesAtRoot#ProjectFiles.ProjectDirectory.g.verified.cs

@@ -0,0 +1,34 @@
+//HintName: ProjectFiles.ProjectDirectory.g.cs
+namespace ProjectFilesGenerator;
+
+using System.IO;
+using System.Collections.Generic;
+
+partial class ProjectDirectory(string path)
+{
+    public string Path { get; } = path;
+
+    public string FullPath => System.IO.Path.GetFullPath(Path);
+
+    public override string ToString() => Path;
+
+    public static implicit operator string(ProjectDirectory temp) =>
+        temp.Path;
+
+    public static implicit operator FileInfo(ProjectDirectory temp) =>
+        new(temp.Path);
+
+    public IEnumerable<string> EnumerateDirectories() =>
+        Directory.EnumerateDirectories(Path);
+
+    public IEnumerable<string> EnumerateFiles() =>
+        Directory.EnumerateFiles(Path);
+
+    public IEnumerable<string> GetFiles() =>
+        Directory.GetFiles(Path);
+
+    public IEnumerable<string> GetDirectories() =>
+        Directory.GetDirectories(Path);
+
+    public DirectoryInfo Info => new(Path);
+}

src/Tests/GeneratorTest.MultipleDotFilesAtRoot#ProjectFiles.ProjectFile.g.verified.cs

@@ -0,0 +1,50 @@
+//HintName: ProjectFiles.ProjectFile.g.cs
+namespace ProjectFilesGenerator;
+
+using System.IO;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+
+partial class ProjectFile(string path)
+{
+    public string Path { get; } = path;
+
+    public string FullPath => System.IO.Path.GetFullPath(Path);
+
+    public override string ToString() => Path;
+
+    public static implicit operator string(ProjectFile temp) =>
+        temp.Path;
+
+    public static implicit operator FileInfo(ProjectFile temp) =>
+        new(temp.Path);
+
+    public FileStream OpenRead() =>
+        File.OpenRead(Path);
+
+    public StreamReader OpenText() =>
+        File.OpenText(Path);
+
+    public string ReadAllText() =>
+        File.ReadAllText(Path);
+
+    public string ReadAllText(Encoding encoding) =>
+        File.ReadAllText(Path, encoding);
+
+    public FileInfo Info => new(Path);
+
+#if NETSTANDARD2_1_OR_GREATER || NETCOREAPP2_0_OR_GREATER
+    public Task<string> ReadAllTextAsync(CancellationToken cancel = default) =>
+        File.ReadAllTextAsync(Path, cancel);
+
+    public Task<string> ReadAllTextAsync(Encoding encoding, CancellationToken cancel = default) =>
+        File.ReadAllTextAsync(Path, encoding,cancel);
+#else
+    public Task<string> ReadAllTextAsync(CancellationToken cancel = default) =>
+        Task.FromResult(File.ReadAllText(Path));
+
+    public Task<string> ReadAllTextAsync(Encoding encoding, CancellationToken cancel = default) =>
+        Task.FromResult(File.ReadAllText(Path, encoding));
+#endif
+}

src/Tests/GeneratorTest.MultipleDotFilesAtRoot#ProjectFiles.g.verified.cs

@@ -0,0 +1,20 @@
+//HintName: ProjectFiles.g.cs
+// <auto-generated/>
+#nullable enable
+
+namespace ProjectFilesGenerator
+{
+    using ProjectFilesGenerator.Types;
+
+    /// <summary>Provides strongly-typed access to project files marked with CopyToOutputDirectory.</summary>
+    static partial class ProjectFiles
+    {
+        public static ProjectFile _editorconfig { get; } = new(".editorconfig");
+        public static ProjectFile _env { get; } = new(".env");
+        public static ProjectFile _gitignore { get; } = new(".gitignore");
+    }
+}
+
+namespace ProjectFilesGenerator.Types
+{
+}