MyAlias.cs

namespace BlueLeet.Build
{
    using System;
    using System.Collections.Generic;
    using System.IO;
    using System.Linq;

    using Cake.Core;
    using Cake.Core.Annotations;
    using Cake.Core.IO;

    using JetBrains.Annotations;

    using NuGet;

    /// <summary>
    /// The extended NuGet.
    /// </summary>
    [UsedImplicitly]
    [CakeAliasCategory("BlueLeetNuGet")]
    [CakeNamespaceImport("NuGet.Core")]
    [CakeNamespaceImport("NuGet.Analysis")]
    [CakeNamespaceImport("NuGet.Analysis.Rules")]
    [CakeNamespaceImport("NuGet.Frameworks")]
    [CakeNamespaceImport("NuGet.Resources")]
    [CakeNamespaceImport("NuGet.Runtime")]
    [CakeNamespaceImport("NuGet.Shared")]
    public static class BlueLeetNuGetAliases
    {
        /// <summary>
        /// NuGet project dependencies.
        /// </summary>
        /// <param name="context">
        /// The <c>context</c>.
        /// </param>
        /// <param name="path">
        /// A relative <see cref="DirectoryPath"/> where packages.config resides.
        /// </param>
        /// <returns>
        /// A <see cref="IEnumerable{PackageReference}"/>.
        /// </returns>
        [CakeMethodAlias]
        [UsedImplicitly]
        public static IEnumerable<PackageReference> GetPackageReferences(this ICakeContext context, DirectoryPath path)
        {
            if (!path.IsRelative)
            {
                throw new CakeException("DirectoryPath must be relative!");
            }

            var packagePath = path.CombineWithFilePath(new FilePath("packages.config"));
            if (!File.Exists(packagePath.FullPath))
            {
                throw new CakeException(string.Format("Could not find a packages.config file in '{0}'", path.FullPath));
            }

            var file = new PackageReferenceFile(packagePath.FullPath);
            return file.GetPackageReferences();
        }

        /// <summary>
        /// Get a NuGet project dependency by <paramref name="packageId"/>.
        /// </summary>
        /// <param name="context">
        /// This <see cref="ICakeContext"/>.
        /// </param>
        /// <param name="path">
        /// A relative <see cref="DirectoryPath"/> where packages.config resides.
        /// </param>
        /// <param name="packageId">
        /// The package Name.
        /// </param>
        /// <returns>
        /// A <see cref="IEnumerable{PackageReference}"/>.
        /// </returns>
        [CakeMethodAlias]
        [UsedImplicitly]
        public static PackageReference GetPackageReference(this ICakeContext context, DirectoryPath path, string packageId)
        {
            if (!path.IsRelative)
            {
                throw new CakeException("DirectoryPath must be relative!");
            }

            var packagePath = path.CombineWithFilePath(new FilePath("packages.config"));
            if (!File.Exists(packagePath.FullPath))
            {
                throw new CakeException(string.Format("Could not find a packages.config file in '{0}'", path.FullPath));
            }

            var file = new PackageReferenceFile(packagePath.FullPath);
            return file.GetPackageReferences().FirstOrDefault(x => x.Id.Equals(packageId, StringComparison.OrdinalIgnoreCase));
        }
    }
}