Microsoft.DotNet.ProjectJsonMigration core library

src/Microsoft.DotNet.ProjectJsonMigration/ProjectMigrator.cs

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+// Copyright (c) .NET Foundation and contributors. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System;
+using System.Collections.Generic;
+using Microsoft.Build.Evaluation;
+using Microsoft.Build.Construction;
+using Microsoft.DotNet.ProjectModel;
+using Microsoft.DotNet.Cli;
+using System.Linq;
+using System.IO;
+using Newtonsoft.Json.Linq;
+
+namespace Microsoft.DotNet.ProjectJsonMigration
+{
+    public class ProjectMigrator
+    {
+        // TODO: Migrate PackOptions
+        // TODO: Support Mappings in IncludeContext Transformations
+        // TODO: Migrate Multi-TFM projects
+        // TODO: Tests
+        // TODO: Out of Scope
+        //     - Globs that resolve to directories: /some/path/**/somedir
+        //     - Migrating Deprecated project.jsons
+        //     - Configuration dependent source exclusion
+
+        public void Migrate(MigrationSettings migrationSettings)
+        {
+            var projectDirectory = migrationSettings.ProjectDirectory;
+            EnsureDirectoryExists(migrationSettings.OutputDirectory);
+
+            var migrationRuleInputs = ComputeMigrationRuleInputs(migrationSettings);
+            VerifyInputs(migrationRuleInputs);
+            
+            new DefaultMigrationRuleSet().Apply(migrationSettings, migrationRuleInputs);
+        }
+
+        private void EnsureDirectoryExists(string outputDirectory)
+        {
+            if (!Directory.Exists(outputDirectory))
+            {
+                Directory.CreateDirectory(outputDirectory);
+            }
+        }
+
+        private MigrationRuleInputs ComputeMigrationRuleInputs(MigrationSettings migrationSettings)
+        {
+            var projectContexts = ProjectContext.CreateContextForEachFramework(migrationSettings.ProjectDirectory);
+
+            var templateMSBuildProject = migrationSettings.MSBuildProjectTemplate ?? ProjectRootElement.Create();
+
+            var propertyGroup = templateMSBuildProject.AddPropertyGroup();
+            var itemGroup = templateMSBuildProject.AddItemGroup();
+
+            return new MigrationRuleInputs(projectContexts, templateMSBuildProject, itemGroup, propertyGroup);
+        }
+
+        private void VerifyInputs(MigrationRuleInputs migrationRuleInputs)
+        {
+            VerifyProject(migrationRuleInputs.ProjectContexts);
+        }
+
+        private void VerifyProject(IEnumerable<ProjectContext> projectContexts)
+        {
+            if (projectContexts.Count() > 1)
+            {
+                throw new Exception("MultiTFM projects currently not supported.");
+            }
+
+            if (projectContexts.Count() == 0)
+            {
+                throw new Exception("No projects found");
+            }
+
+            if (projectContexts.First().LockFile == null)
+            {
+                throw new Exception("Restore must be run prior to project migration.");
+            }
+        }
+
+
+    }
+}