part 1

.gitignore

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+.idea
+bin
+obj
+packages
+*.user
+*.nupkg

.gitmodules

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+[submodule "MonoGame"]
+	path = MonoGame
+	url = https://github.com/MonoGame/MonoGame

.idea/.idea.Contentless/.idea/vcs.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+    <mapping directory="$PROJECT_DIR$/MonoGame" vcs="Git" />
+    <mapping directory="$PROJECT_DIR$/MonoGame/ThirdParty/Dependencies" vcs="Git" />
+    <mapping directory="$PROJECT_DIR$/MonoGame/ThirdParty/NVorbis" vcs="Git" />
+    <mapping directory="$PROJECT_DIR$/MonoGame/ThirdParty/SDL_GameControllerDB" vcs="Git" />
+    <mapping directory="$PROJECT_DIR$/MonoGame/ThirdParty/StbImageSharp" vcs="Git" />
+    <mapping directory="$PROJECT_DIR$/MonoGame/ThirdParty/StbImageWriteSharp" vcs="Git" />
+  </component>
+</project>

Contentless.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Contentless", "Contentless\Contentless.csproj", "{A5C68D51-B404-44C9-8DD8-BAD4FD62A82D}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MonoGame.Framework.Content.Pipeline.Windows", "MonoGame\MonoGame.Framework.Content.Pipeline\MonoGame.Framework.Content.Pipeline.Windows.csproj", "{B950DE10-AC5D-4BD9-B817-51247C4A732D}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Test", "Test\Test.csproj", "{58716AA9-5BCE-42C5-A0E7-D8B23C0488BA}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{A5C68D51-B404-44C9-8DD8-BAD4FD62A82D}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{A5C68D51-B404-44C9-8DD8-BAD4FD62A82D}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{A5C68D51-B404-44C9-8DD8-BAD4FD62A82D}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{A5C68D51-B404-44C9-8DD8-BAD4FD62A82D}.Release|Any CPU.Build.0 = Release|Any CPU
+		{B950DE10-AC5D-4BD9-B817-51247C4A732D}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{B950DE10-AC5D-4BD9-B817-51247C4A732D}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{B950DE10-AC5D-4BD9-B817-51247C4A732D}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B950DE10-AC5D-4BD9-B817-51247C4A732D}.Release|Any CPU.Build.0 = Release|Any CPU
+		{58716AA9-5BCE-42C5-A0E7-D8B23C0488BA}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{58716AA9-5BCE-42C5-A0E7-D8B23C0488BA}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{58716AA9-5BCE-42C5-A0E7-D8B23C0488BA}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{58716AA9-5BCE-42C5-A0E7-D8B23C0488BA}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal

Contentless/Contentless.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>netcoreapp2.2</TargetFramework>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\MonoGame\MonoGame.Framework.Content.Pipeline\MonoGame.Framework.Content.Pipeline.Windows.csproj" />
+    </ItemGroup>
+
+</Project>

Contentless/Program.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Reflection;
+using Microsoft.Xna.Framework.Content.Pipeline;
+
+namespace Contentless {
+    public static class Program {
+
+        private static readonly ImporterInfo[] Importers = GetContentImporters().ToArray();
+        private static readonly string[] ExcludedFolders = {"bin", "obj"};
+
+        public static void Main(string[] args) {
+            var contentFile = new FileInfo(Path.Combine(Environment.CurrentDirectory, args[0]));
+            if (!contentFile.Exists) {
+                Console.WriteLine($"Unable to find content file {contentFile}");
+                return;
+            }
+            var content = ReadContent(contentFile);
+
+            var changed = false;
+            foreach (var file in contentFile.Directory.EnumerateFiles("*", SearchOption.AllDirectories)) {
+                // is the file the content file?
+                if (file.Name == contentFile.Name)
+                    continue;
+                var relative = Path.GetRelativePath(contentFile.Directory.FullName, file.FullName).Replace("\\", "/");
+
+                // is the file in an excluded directory?
+                var dirName = file.DirectoryName.Replace("\\", "/");
+                if (ExcludedFolders.Any(e => dirName.Contains(e))) {
+                    continue;
+                }
+
+                // is the file already in the content file?
+                if (HasEntry(content, relative)) {
+                    Console.WriteLine($"Skipping file {relative} as it is already part of the content file");
+                    continue;
+                }
+
+                var importer = GetImporterFor(relative);
+                if (importer == null) {
+                    Console.WriteLine($"No importer found for file {relative}, please add the file manually");
+                    continue;
+                }
+
+                AddFile(content, relative, importer);
+                changed = true;
+            }
+
+            if (changed) {
+                contentFile.Delete();
+                using (var stream = contentFile.CreateText()) {
+                    foreach (var line in content)
+                        stream.WriteLine(line);
+                }
+                Console.WriteLine("Wrote changes to content file");
+            }
+            Console.Write("Done");
+        }
+
+        private static IEnumerable<ImporterInfo> GetContentImporters() {
+            foreach (var assembly in AppDomain.CurrentDomain.GetAssemblies()) {
+                foreach (var type in assembly.GetTypes()) {
+                    var importer = (ContentImporterAttribute) type.GetCustomAttribute(typeof(ContentImporterAttribute), true);
+                    if (importer != null)
+                        yield return new ImporterInfo(importer, type);
+                }
+            }
+        }
+
+        private static ImporterInfo GetImporterFor(string file) {
+            var extension = Path.GetExtension(file);
+            foreach (var importer in Importers) {
+                if (importer.Importer.FileExtensions.Contains(extension))
+                    return importer;
+            }
+            return null;
+        }
+
+        private static bool HasEntry(IEnumerable<string> content, string relativeFile) {
+            foreach (var line in content) {
+                if (line.StartsWith($"#begin {relativeFile}"))
+                    return true;
+            }
+            return false;
+        }
+
+        private static List<string> ReadContent(FileInfo file) {
+            var content = new List<string>();
+            using (var stream = file.OpenText()) {
+                string line;
+                while ((line = stream.ReadLine()) != null) {
+                    content.Add(line);
+                }
+            }
+            return content;
+        }
+
+        private static void AddFile(List<string> content, string relative, ImporterInfo importer) {
+            content.Add($"#begin {relative}");
+            content.Add($"/importer:{importer.Type.Name}");
+            content.Add($"/processor:{importer.Importer.DefaultProcessor}");
+            content.Add($"/build:{relative}");
+            content.Add("");
+
+            Console.WriteLine($"Adding file {relative} with importer {importer.Type.Name} and processor {importer.Importer.DefaultProcessor}");
+        }
+
+        private class ImporterInfo {
+
+            public readonly ContentImporterAttribute Importer;
+            public readonly Type Type;
+
+            public ImporterInfo(ContentImporterAttribute importer, Type type) {
+                this.Importer = importer;
+                this.Type = type;
+            }
+
+        }
+
+    }
+}

MonoGame

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+Subproject commit 27bdfa92abf597c345c9c40bb4999b0fcd2dcaa2

Test/Content/Content.mgcb

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+
+#----------------------------- Global Properties ----------------------------#
+
+/outputDir:bin
+/intermediateDir:obj
+/platform:DesktopGL
+/config:
+/profile:Reach
+/compress:False
+
+#-------------------------------- References --------------------------------#
+
+
+#---------------------------------- Content ---------------------------------#
+
+#begin Textures/Inside.png
+/importer:TextureImporter
+/processor:TextureProcessor
+/build:Textures/Inside.png
+
+#begin Locale/Interface.xml
+/importer:XmlImporter
+/processor:PassThroughProcessor
+/build:Locale/Interface.xml
+
+#begin Textures/Icons.png
+/importer:TextureImporter
+/processor:TextureProcessor
+/build:Textures/Icons.png
+

Test/Content/Locale/Interface.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<XnaContent>
+    <Asset Type="System.Collections.Generic.Dictionary[System.String, System.String]">
+        <Item>
+            <Key>Place</Key>
+            <Value>Place</Value>
+        </Item>
+        <Item>
+            <Key>Drop</Key>
+            <Value>Drop</Value>
+        </Item>
+        <Item>
+            <Key>TimeHour</Key>
+            <Value>h:mm tt</Value>
+        </Item>
+        <Item>
+            <Key>TimeDay</Key>
+            <Value>dddd d MMM</Value>
+        </Item>
+        <Item>
+            <Key>Inventory</Key>
+            <Value>Inventory</Value>
+        </Item>
+        <Item>
+            <Key>Tools</Key>
+            <Value>Tools</Value>
+        </Item>
+    </Asset>
+</XnaContent>

Test/Test.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>netcoreapp2.2</TargetFramework>
+    </PropertyGroup>
+
+</Project>