Welcome to Metalama, a Roslyn-based meta-programming framework designed to enhance your code quality and productivity in C#. Metalama stands on three foundational principles:

• Boilerplate Reduction: Harness the power of aspect-oriented programming to dynamically generate repetitive code during compilation. This ensures your source code stays concise and clear.
• Architecture as Code: Receive real-time validation of your code against your architectural guidelines, patterns, and conventions. Say goodbye to waiting for code reviews.
• Tailored Coding Assistance: Arm your team with personalized code fixes and refactorings.

Quick Links

• 🌐 Metalama Website
• 📖 Documentation
• 📝 Annotated Examples
• 🎥 Tutorial Videos
• 🐞 Bug Reports
• 💬 Discussions
• 📜 Detailed Changelog
• 📢 Release Notes

Repositories

This repository serves as a hub for Metalama. The codebase is distributed across the following repositories:

Link	License	Description
Metalama.Compiler	MIT	A Roslyn fork that introduces an extension point for arbitrary source code transformations.
Metalama.Framework	Source Available	The core implementation of the Metalama Framework.
Metalama.Framework.Private	Proprietary	Access to this repository is required to build Metalama.Framework and is granted to customers who have an active Source Code Subscription.
Metalama.Backstage	Source Available	Implements infrastructure core for other Metalama projects, like management of configuration and temporary files.
PostSharp.Engineering	MIT	A custom multi-repo build and CI framework.
Metalama.Framework.RunTime	MIT	Run-time classes utilized by code generated via Metalama.Framework.
Metalama.Extensions	MIT	Open-source, professional-grade extensions for Metalama such as dependency injection or architecture verification.
Metalama.Patterns	MIT	Ready-to-use, open-source and professional-grade aspects, including caching, code contracts, and INotifyPropertyChanged.
Metalama.LinqPad	MIT	A LinqPad driver for querying any C# project or solution.
Metalama.Community	MIT	Repository housing community-contributed aspects.
Metalama.Migration	MIT	The original PostSharp API annotated with guidelines to transition to Metalama.
Metalama.Documentation	MIT	Source repository for documentation hosted on Metalama Docs.
Metalama.Samples	MIT	A collection of illustrative samples available at Metalama Examples.

Dependencies

Here is a graph of the dependencies between these repos:

flowchart LR
    
Metalama.Backstage --> Metalama.Framework
Metalama.Framework.Private --> Metalama.Framework
Metalama.Framework.RunTime --> Metalama.Framework
Metalama.Compiler --> Metalama.Framework
Metalama.Framework --> Metalama.Extensions
Metalama.Extensions --> Metalama.Migration
Metalama.Extensions --> Metalama.Samples
Metalama.Extensions --> Metalama.Patterns
Metalama.Framework --> Metalama.LinqPad
Metalama.Framework --> Metalama.Community
Metalama.Migration --> Metalama.Documentation
Metalama.Samples --> Metalama.Documentation
Metalama.Patterns --> Metalama.Documentation

Our Git flow

• We don't use the master nor the main branch.
• We are generally concurrently working on three versions, numbered YYYY.N. Typically, one is stable and maintained, the other is rc and the third is preview.
• You should generally check out the release/YYYY.N branch.
• Our continuous integration branches are develop/YYYY.N. They generally depend on unpublished build artifacts of dependencies and therefore cannot be easily built by the public except by building the dependencies locally. Our develop/YYYY.N builds can occasionally be broken.
• When we publish artifacts (for instance to nuget.org):
  • We update the version of package references to the ones just uploaded to nuget.org.
  • We mark the released commit with the precise package version, e.g. /release/2023.4.1-preview.
  • We merge the develop/YYYY.N branch into release/YYYY.N.
• We work on branches named topic/YYYY.N/whatever and generally do PRs to develop/YYYY.N.
• After any merge to an "old" develop/YYYY.N, the "old" develop/YYYY.N is automatically merged into the newer develop/YYYY.N+1. A merge commit, named merge/YYYY.N+1/commit-123456 is automatically created, tested, if possible merged, then deleted.
• We use a private TeamCity service for our continuous integration.

Illustration

The following schema illustrates our workflow. It shows two public builds, 2023.4.1-preview and 2023.4.2-preview, each including two bug fixes.

%%{init: { 'gitGraph': { 'mainBranchName':'develop/2023.4', 'mainBranchOrder': 1, 'showCommitLabel': false }} }%%

gitGraph:
    commit
    branch release/2023.4 order:0
    branch topic/2023.4/1234-bug-1 order:1
    checkout topic/2023.4/1234-bug-1
    commit
    commit
    checkout develop/2023.4
    merge topic/2023.4/1234-bug-1
    branch topic/2023.4/1235-bug-2  order:2
    checkout topic/2023.4/1235-bug-2
    commit
    commit
    checkout develop/2023.4
    merge topic/2023.4/1235-bug-2 tag:"release/2023.4.1-preview" type:HIGHLIGHT
    checkout release/2023.4
    merge develop/2023.4
    branch topic/2023.4/1236-bug-3 order:3
    checkout topic/2023.4/1236-bug-3
    commit
    commit
    checkout develop/2023.4
    merge topic/2023.4/1236-bug-3
    branch topic/2023.4/1237-bug-4 order:4
    checkout topic/2023.4/1237-bug-4
    commit
    commit
    checkout develop/2023.4
    merge topic/2023.4/1237-bug-4 tag:"release/2023.4.2-preview" type:HIGHLIGHT
    checkout release/2023.4
    merge develop/2023.4
    
commit

The Dream Weavers of Metalama

It's in the vibrant streets of Prague, Czechia, that an insurrection against boilerplate rose in 2004. Back in the days when the C# compiler was an obscure, closed-source monolith, inaccessible for extensibility, PostSharp became the first successful implementation of aspect-oriented in .NET. Fifteen years later, when Microsoft released .NET 5 and added source generators to Roslyn, we knew it was time for a complete rewrite based on new .NET stack. This project, originally codenamed "Caravela", became Metalama, and its first stable version was released in May 2023.

The Core Team

• Gael Fraiteur: The Captain of our ship, Lead Architect, and beloved Chief Mad Scientist.
• Antonin Prochazka: Senior Software Developer, DevOps Maestro, and the guy who often talks to machines (and they listen).
• Daniel Balas: Senior Software Developer and our in-house "Thread Whisperer". Rumor has it he can split threads finer than hair!
• Petr Onderka: Senior Software Developer and Compiler Maniac, often found in deep conversations with compilers late into the night.
• Zuzana Hybsova: Our anchor, the Back-Office Manager. The only one who ensures our creative chaos remains just the right side of insane.

The Passionate Collaborators

• Alex Dolin: Dived head-first into Metalama's proof-of-concept phase in 2020 when the project was still named Caravela.
• Tom Glastonbury: The passionate soul behind the inception of Metalama.Patterns in 2023. Some say he dreams in patterns.

Our Enthusiast VIPs

We extend our deepest gratitude to the following champions for their countless suggestions, invaluable feedback, and diligent bug reports that have immensely contributed to our community:

• Whit Waldo
• Dom Sinclair
• Onur Er
• Marc Kruse

Their dedication and insights have been pivotal in shaping Metalama to its finest.