refactor: restructure packages to improve extensibility

This change splits the System.IO.Abstractions package into TestableIO.System.IO.Abstractions and TestableIO.System.IO.Abstractions.Wrappers.
The former contains just the interfaces and the latter the default wrapper implementations.
The package System.IO.Abstractions still exists as meta package to reduce impact on existing users.
The same applies to TestableIO.System.IO.Abstractions.TestingHelpers.

BREAKING CHANGE: This refactoring moves all types to the TestableIO.System.IO.Abstractions library. Users might need to recompile their libraries.

Author: fgreinacher

.github/workflows/ci.yml

@@ -89,7 +89,8 @@ jobs:
       github.event_name == 'push' &&
       (
         startsWith(github.event.head_commit.message, 'feat:') ||
-        startsWith(github.event.head_commit.message, 'fix:')
+        startsWith(github.event.head_commit.message, 'fix:') ||
+        contains(github.event.head_commit.message, 'breaking change')
       )
     needs: [pack]
     runs-on: ubuntu-latest

README.md

@@ -1,5 +1,5 @@
 ![System.IO.Abstractions](https://socialify.git.ci/TestableIO/System.IO.Abstractions/image?description=1&font=Source%20Code%20Pro&forks=1&issues=1&pattern=Charlie%20Brown&pulls=1&stargazers=1&theme=Dark)
-[![NuGet](https://img.shields.io/nuget/v/System.IO.Abstractions.svg)](https://www.nuget.org/packages/System.IO.Abstractions)
+[![NuGet](https://img.shields.io/nuget/v/TestableIO.System.IO.Abstractions.svg)](https://www.nuget.org/packages/TestableIO.System.IO.Abstractions)
 ![Continuous Integration](https://github.com/TestableIO/System.IO.Abstractions/workflows/Continuous%20Integration/badge.svg)
 [![Codacy Badge](https://app.codacy.com/project/badge/Grade/54479b054d194adfb4ff476ef0182fe0)](https://www.codacy.com/gh/TestableIO/System.IO.Abstractions/dashboard?utm_source=github.com&utm_medium=referral&utm_content=TestableIO/System.IO.Abstractions&utm_campaign=Badge_Grade)
 [![Renovate enabled](https://img.shields.io/badge/renovate-enabled-brightgreen.svg)](https://renovatebot.com/)
@@ -8,9 +8,11 @@
 At the core of the library is `IFileSystem` and `FileSystem`. Instead of calling methods like `File.ReadAllText` directly, use `IFileSystem.File.ReadAllText`. We have exactly the same API, except that ours is injectable and testable.
 
 ```shell
-dotnet add package System.IO.Abstractions
+dotnet add package TestableIO.System.IO.Abstractions
 ```
 
+*Note: This NuGet package is also published as `System.IO.Abstractions` but we suggest to use the prefix to make clear that this is not an official .NET package.*
+
 ```csharp
 public class MyComponent
 {
@@ -43,9 +45,11 @@ public class MyComponent
 The library also ships with a series of test helpers to save you from having to mock out every call, for basic scenarios. They are not a complete copy of a real-life file system, but they'll get you most of the way there.
 
 ```shell
-dotnet add package System.IO.Abstractions.TestingHelpers
+dotnet add package TestableIO.System.IO.Abstractions.TestingHelpers
 ```
 
+*Note: This NuGet package is also published as `System.IO.Abstractions.TestingHelpers` but we suggest to use the prefix to make clear that this is not an official .NET package.*
+
 ```csharp
 [Test]
 public void MyComponent_Validate_ShouldThrowNotSupportedExceptionIfTestingIsNotAwesome()

src/System.IO.Abstractions.TestingHelpers/System.IO.Abstractions.TestingHelpers.csproj

@@ -1,21 +1,15 @@
 <Project Sdk="Microsoft.NET.Sdk">
-    <PropertyGroup>
-        <AssemblyName>System.IO.Abstractions.TestingHelpers</AssemblyName>
-        <RootNamespace>System.IO.Abstractions.TestingHelpers</RootNamespace>
-        <Description>A set of pre-built mocks to help when testing file system interactions.</Description>
-        <TargetFrameworks>net6.0;net5.0;netstandard2.1;netstandard2.0;net461</TargetFrameworks>
-        <PackageIcon>icon_256x256.png</PackageIcon>
-    </PropertyGroup>
-    <ItemGroup>
-        <ProjectReference Include="../System.IO.Abstractions/System.IO.Abstractions.csproj" />
-    </ItemGroup>
-    <ItemGroup>
-        <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies.net461" Version="1.0.3">
-            <PrivateAssets>all</PrivateAssets>
-            <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
-        </PackageReference>
-    </ItemGroup>
-    <ItemGroup>
-        <None Include="..\..\images\icon_256x256.png" Pack="true" PackagePath="\" />
-    </ItemGroup>
+  <PropertyGroup>
+      <AssemblyName>System.IO.Abstractions.TestingHelpers</AssemblyName>
+      <RootNamespace>System.IO.Abstractions.TestingHelpers</RootNamespace>
+      <Description>A set of pre-built mocks to help when testing file system interactions.</Description>
+      <TargetFrameworks>net6.0;net5.0;netstandard2.1;netstandard2.0;net461</TargetFrameworks>
+      <PackageIcon>icon_256x256.png</PackageIcon>
+  </PropertyGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\TestableIO.System.IO.Abstractions.TestingHelpers\TestableIO.System.IO.Abstractions.TestingHelpers.csproj" />
+</ItemGroup>
+  <ItemGroup>
+    <None Include="..\..\images\icon_256x256.png" Pack="true" PackagePath="\" />
+  </ItemGroup>
 </Project>