Nerfed/Nerfed.Builder/Builder/Builder.cs

using System.Diagnostics;

namespace Nerfed.Builder;

public class Builder : IDisposable
{
    private readonly Dictionary<string, IImporter> importers = new Dictionary<string, IImporter>();
    private readonly RawFileImporter rawFileImporter;

    public Builder()
    {
        rawFileImporter = new RawFileImporter();

        ShaderImporter shaderImporter = new ShaderImporter();
        importers.Add(".vert", shaderImporter); // Vertex shader
        importers.Add(".frag", shaderImporter); // Fragment shader
        importers.Add(".tesc", shaderImporter); // Tessellation control shader
        importers.Add(".tese", shaderImporter); // Tessellation evaluation shader
        importers.Add(".geom", shaderImporter); // Geometry shader
        importers.Add(".comp", shaderImporter); // Compute shader
    }

    public void Run(BuildArgs args)
    {
        Stopwatch stopwatch = new Stopwatch();
        stopwatch.Start();

        List<string> contentFiles = args.ContentFiles;
        string absContentPath = $"{args.ProjectPath}/{PathUtil.ContentFolderName}";

        // If no files are provided, build all content.
        if (args.ContentFiles == null)
        {
            contentFiles = [];
            CollectAssetFiles(absContentPath, absContentPath, ref contentFiles);
        }

        string importPath = $"{args.ProjectPath}/{PathUtil.ImportFolderName}";

        ParallelOptions parallelOptions = new ParallelOptions
        {
            MaxDegreeOfParallelism = contentFiles.Count
        };
        Parallel.ForEach(contentFiles, parallelOptions, relativeFile =>
        {
            try
            {
                string inFile = $"{args.ProjectPath}/{PathUtil.ContentFolderName}/{relativeFile}";

                if (!File.Exists(inFile))
                {
                    Console.Error.WriteLine($"Asset file '{relativeFile}' not found");
                    return;
                }

                string outFile = $"{importPath}/{relativeFile}{PathUtil.ImportedFileExtension}";

                FileInfo inFileInfo = new FileInfo(inFile);
                FileInfo outFileInfo = new FileInfo(outFile);

                if (!FileUtil.IsNewer(inFileInfo, outFileInfo))
                {
                    // File has not changed since last build, no need to build this one.
                    return;
                }

                string outDir = Path.GetDirectoryName(outFile);
                if (!Directory.Exists(outDir))
                {
                    Directory.CreateDirectory(outDir);
                }

                string ext = Path.GetExtension(inFile).ToLower();
                if (importers.TryGetValue(ext, out IImporter importer))
                {
                    importer.Import(inFile, outFile);
                }
                else
                {
                    rawFileImporter.Import(inFile, outFile);
                }

                Console.WriteLine(relativeFile);
            }
            catch (Exception e)
            {
                Console.Error.WriteLine($"Import error on asset '{relativeFile}': {e.Message}");
            }
        });

        Console.WriteLine($"Build content completed in {stopwatch.Elapsed.TotalSeconds:F2} seconds");
    }

    private void CollectAssetFiles(string assetDir, string dir, ref List<string> files)
    {
        foreach (string file in Directory.EnumerateFiles(dir))
        {
            if (Path.GetExtension(file).Equals(PathUtil.ImportFileExtension, StringComparison.CurrentCultureIgnoreCase))
            {
                continue;
            }

            string relativeFile = file.Substring(assetDir.Length, file.Length - assetDir.Length);
            if (relativeFile[0] == Path.DirectorySeparatorChar || relativeFile[0] == Path.AltDirectorySeparatorChar)
            {
                relativeFile = relativeFile.Substring(1, relativeFile.Length - 1);
            }

            files.Add(relativeFile);
        }

        foreach (string subDir in Directory.EnumerateDirectories(dir))
        {
            CollectAssetFiles(assetDir, subDir, ref files);
        }
    }

    public void Dispose() { }
}