assembly2nuspec.linq

<Query Kind="Program">
  <Namespace>System.Threading.Tasks</Namespace>
</Query>

const string folder = @"C:\Git\_InternalTools\Nephele";
const string assemblyPath = @"bin\debug\net46";

void Main()
{
	foreach (var filename in Directory.GetFiles(folder, "*.nuspec", SearchOption.AllDirectories))
	{
		ProcessNuspec(filename);
	}
}

private void ProcessNuspec(string nuspecFilename)
{
	var projectFolder = Path.GetDirectoryName(nuspecFilename);
	var projectName = Path.GetFileNameWithoutExtension(nuspecFilename);
	
	var csprojFilename = Path.Combine(projectFolder, projectName) + ".csproj";
	if (File.Exists(csprojFilename) == false)
	{
		return;
	}

	var assemblyFilename = Path.Combine(projectFolder, assemblyPath, projectName) + ".dll";
	if (File.Exists(assemblyFilename) == false)
	{
		Console.WriteLine($"File not found: {assemblyFilename}");
		return;
	}
	
	UpdateNuspec(nuspecFilename, assemblyFilename);
}

private void UpdateNuspec(string nuspecFilename, string assemblyFilename)
{
	var assembly = Assembly.ReflectionOnlyLoadFrom(assemblyFilename);

	Console.WriteLine($"Processing {nuspecFilename}");
	
	var nuspec = XDocument.Load(nuspecFilename);
	
	var updatedNuspec = UpdateNuspec(nuspec.XPathSelectElement("package/metadata"), assembly);
	if (updatedNuspec == false)
	{
		Console.WriteLine("No change");
		return;
	}
	
	Console.WriteLine("Saving updated nuspec");
	nuspec.Save(nuspecFilename);
}

private bool UpdateNuspec(XElement nuspec, Assembly assembly)
{
	var dirty = false;
	var id = assembly.GetName().Name;
	var attributes = assembly.GetCustomAttributesData();
	
	dirty |= UpdateNuspec<string>(nuspec, "id", attributes, id);
	dirty |= UpdateNuspec<AssemblyTitleAttribute>(nuspec, "title", attributes, id);
	dirty |= UpdateNuspec<AssemblyCompanyAttribute>(nuspec, "authors", attributes, id);
	dirty |= UpdateNuspec<AssemblyCompanyAttribute>(nuspec, "owners", attributes, id);
	dirty |= UpdateNuspec<AssemblyDescriptionAttribute>(nuspec, "description", attributes, id);
	dirty |= UpdateNuspec<string>(nuspec, "copyright", attributes, $"Copyright © {GetAttributeValue<AssemblyCompanyAttribute>(attributes, id)} {DateTime.Now.Year}");
	
	return dirty;
}

private bool UpdateNuspec<T>(XElement metadata, string key, IList<CustomAttributeData> attributes, string defaultValue)
{
	var node = metadata.Element(key);
	if (node == null)
	{
		return false;
	}

	var value = GetAttributeValue<T>(attributes, defaultValue);
	if (node.Value == value)
	{
		return false;
	}
	
	node.Value = value;
	return true;
}

private string GetAttributeValue<T>(IList<CustomAttributeData> attributes, string defaultValue)
{
	return attributes.FirstOrDefault(a => a.AttributeType == typeof(T))?.ConstructorArguments[0].Value.ToString() ?? defaultValue;
}

This does not yet support lifting the project dependencies to the nuspec.