nexus/README.md

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# Nexus Client
## Description
A simple and user-friendly Matrix client made with Flutter and a Gomuks backend.
## Screenshots
| Dark Mode | Light Mode |
| :--------------------------------------------------------------------------------------------------------------------------------------------------------------------------: | :------------------------------------------------------------------------------: |
| ![Screenshot of Nexus Client in dark mode, showing users talking, with a sidebar showing rooms and spaces, and another sidebar showing members](./assets/screenshotDark.png) | ![The same screenshot as above, but in light mode](./assets/screenshotLight.png) |
## Try it out
If you want to try out Nexus, download the [latest release](https://git.federated.nexus/Nexus/nexus/releases/latest).
### Nightly Builds
For the newest changes, grab one of the following nightly artifacts, built by CI from the latest commit on `main`.
- [Android APK](https://nightly.link/Henry-Hiles/nexus/workflows/android/main/APK.zip)
- [Unsigned iOS IPA](https://nightly.link/Henry-Hiles/nexus/workflows/ios/main/Nexus.ipa.zip)
- [Unsigned MacOS DMG](https://nightly.link/Henry-Hiles/nexus/workflows/macos/main/nexus.dmg.zip)
- [Windows EXE](https://nightly.link/Henry-Hiles/nexus/workflows/windows/main/windows-installer.zip)
Or, use one of the below methods:
### Nightly Flatpak Repo
Make sure Flatpak is set up on your system, then run:
```bash
flatpak install --user https://nexus.federated.nexus/flatpak/nexus.flatpakref
```
This adds the Nexus remote and installs the app for your user only, so no root access is needed (x86_64 and aarch64 are supported). To install system-wide instead, use `--system` in place of `--user`. Updates arrive through `flatpak update` or your software center.
### NixOS Module
Add Nexus as a flake input, following `nixpkgs` for less fetches:
```nix
nexus = {
url = "git+https://git.federated.nexus/Nexus/nexus";
inputs.nixpkgs.follows = "nixpkgs";
};
```
This tracks the latest commit on `main`. To stay on a release instead, pin the input to its tag:
```nix
url = "git+https://git.federated.nexus/Nexus/nexus?ref=refs/tags/v1.0.0-alpha2";
```
Then import the module and enable it in your NixOS configuration:
```nix
{ inputs, ... }:
{
imports = [ inputs.nexus.nixosModules.default ];
programs.nexus = {
enable = true;
enableNotifications = true; # optional: push notifications via UnifiedPush
};
}
```
This installs Nexus system-wide. With `enableNotifications`, it also installs KUnifiedPush and registers its systemd and D-Bus services so notifications work. The `package` option lets you override the package if you need to.
## Build it yourself
### Prerequisites
#### Linux
- On NixOS: Either use direnv and `direnv allow`, or `nix develop`
- On other distros: Install Flutter, Go, Git, Libclang, Libass, MPV, and Glibc. Do not use any Snap packages, they cause various compilation issues.
#### Windows
You will need:
- Flutter
- Git
- Libass
- MPV
- Go
- Visual Studio 2022 (Desktop development with C++)
- [MSYS2/MinGW-w64 GCC](https://www.msys2.org/) (for CGO)
- [LLVM/Clang + libclang](https://clang.llvm.org/get_started.html) (for `ffigen`)
On Windows, make sure these are available in your shell `PATH`:
- `C:\msys64\ucrt64\bin` (or your MinGW bin path containing `x86_64-w64-mingw32-gcc.exe`)
- `C:\Program Files\LLVM\bin` (contains `clang.exe` and `libclang.dll`)
For `dart scripts/generate.dart`, you may also need:
```powershell
$env:CPATH = "C:\msys64\ucrt64\include"
```
#### MacOS
Similar prerequisites apply (Flutter, Git, Go, C toolchain, LLVM/libclang), but exact setup has not been fully documented yet.
### Clone repo
First, clone and open the repo:
```sh
git clone --recurse-submodules https://git.federated.nexus/Nexus/nexus
cd nexus
```
### Set up Flutter
Get dependencies:
```sh
flutter pub get
```
Generate Gomuks bindings:
```sh
dart scripts/generate.dart
```
> [!NOTE]
> If you are having issues with `stddef.h` not being found, try setting CPATH manually:
>
> ```sh
> export CPATH="$(clang -v 2>&1 | grep "Selected GCC installation" | rev | cut -d' ' -f1 | rev)/include"
> ```
Build webcrypto:
```sh
flutter pub run webcrypto:setup
```
Build generated files, and watch for new changes:
```sh
flutter pub run build_runner watch
```
Run the app:
```sh
flutter run
```
Development instructions can be found in [DEVELOPMENT.md](./DEVELOPMENT.md).
## Community
Join the [Nexus Client Matrix room](https://matrix.to/#/#nexus:federated.nexus) for questions or help with developing or using Nexus Client.
## Credits
Thank you Hylke Bons (https://planetpeanut.studio) for making the amazing icon for Nexus!
Thank you Tulir Asokan for making [Gomuks](https://github.com/gomuks/gomuks), and helping us integrate it into Nexus!