https://github.com/better-mojo/logger

mojo logger, please check: https://prefix.dev/channels/better-mojo
https://github.com/better-mojo/logger

ffi mojo mojo-lang spdlog spdlog-rs

Last synced: 2 days ago
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mojo logger, please check: https://prefix.dev/channels/better-mojo

Host: GitHub
URL: https://github.com/better-mojo/logger
Owner: better-mojo
License: apache-2.0
Created: 2026-05-24T06:48:38.000Z (about 1 month ago)
Default Branch: main
Last Pushed: 2026-05-27T12:13:45.000Z (about 1 month ago)
Last Synced: 2026-05-27T14:12:16.347Z (about 1 month ago)
Topics: ffi, mojo, mojo-lang, spdlog, spdlog-rs
Language: Mojo
Homepage:
Size: 111 KB
Stars: 1
Watchers: 0
Forks: 0
Open Issues: 0
Metadata Files:
- Readme: README.md
- License: LICENSE

Awesome Lists containing this project

README

          # logger

- ✅ Binding the popular Rust logging library [spdlog-rs](https://github.com/SpriteOvO/spdlog-rs) via FFI for Mojo usage.

- ✅ Redesigned API inspired by Python's [loguru](https://github.com/delgan/loguru) logging library for improved usability.








Logger Mojo


  


    🐝 Binding spdlog-rs logging library for mojo 🔥

    


![Mojo Version][language-shield]

[![MIT License][license-shield]][license-url]

[![Pixi Badge](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/prefix-dev/pixi/main/assets/badge/v0.json)](https://pixi.sh)




[![Contributors Welcome][contributors-shield]][contributors-url]

[简体中文](README_CN.md) | English

  



## Package Contents

| Project                             | Package                 | Host | Rank   | Description                              |

|-------------------------------------|-------------------------|------|--------|------------------------------------------|

| ✅ [spdlog-ffi](./packages/spdlog-ffi)   | [libspdlog_ffi](https://prefix.dev/channels/better-ffi/packages/libspdlog_ffi) | [prefix.dev](https://prefix.dev/channels/better-ffi) | ⭐️⭐️⭐️ | spdlog-rs ffi package                    |

| ✅ [spdlog](./packages/spdlog) | [spdlog](https://prefix.dev/channels/better-mojo/packages/spdlog)  | [prefix.dev](https://prefix.dev/channels/better-mojo) | ⭐️⭐️⭐️⭐️   | spdlog-mojo package                      |

## Features

- ✅ Support logging to: `console`, `file`, `stdout`, `stderr`

- ✅ Support custom log `format`

- ✅ Support log `level` configuration

- ✅ Support `colored` logs

## Usage

- Import dependencies:

```toml

# First add channel sources, including spdlog-ffi package and spdlog package

channels = [

    "https://conda.modular.com/max-nightly",

    "https://repo.prefix.dev/better-ffi", # contains spdlog-ffi package

    "https://repo.prefix.dev/better-mojo", # contains spdlog mojo package

    "conda-forge",

]

# Add dependency packages

[dependencies]

mojo = ">=1.0.0b2.dev2026052706,<2" # TODO X: fix version inconsistency issue!!!

# FFI dependency

libspdlog_ffi = ">=0.1.0,<0.2"

# Mojo package dependency

# spdlog = { git = "https://github.com/better-mojo/logger.git", branch = "main" }

spdlog = ">=0.1.2,<0.2"

```

- ✅ Simple example:

```mojo

from spdlog import get_logger

def main() raises -> None:

    var logger = get_logger()

    logger.info("Hello, World!")

    logger.debug("Processing item {} of {}", "5", "100")

    logger.warn("Disk usage is at {}%", "85")

```

- ✅ run:

```bash

# Run logging example

pixi run mojo -I . examples/logger.mojo

```



- ✅ Complete example [examples/try-uuid](examples/try-uuid)

  - Includes complete package dependency import methods

```bash

# Install dependencies

pixi install

# Run

pixi run mojo src/main.mojo

```

### File Logging Example

- [examples/logger_file.mojo](examples/logger_file.mojo)

  - Includes complete package dependency import methods

  - Includes file logging example

## Development Environment

### Install Dependencies

- Install [Taskfile](https://github.com/go-task/go-task): build tool

- Install [Rust](https://www.rust-lang.org/tools/install)

- Install [pixi](https://pixi.sh/)

- Install [rattler-build](https://rattler-build.prefix.dev/latest/#installation): package management tool, compile + publish rust binary packages

- Install [mojo](https://mojolang.org/install/)

```bash

task setup

```

### Build and Debug

- ✅ Build and debug spdlog-ffi package

```bash

# Run examples

task ffi:r

# Build spdlog-ffi package

task ffi:b

# Release spdlog-ffi package

task ffi:rel

```

- ✅ Build and debug [examples](./examples)

```bash

# Run examples

task run:logger

```

## Release and Publish to Prefix.dev

- ✅ 

- ✅ 

- ✅ [Taskfile](./Taskfile.yml)

```bash

# Publish spdlog-ffi package to prefix.dev

task m:q:rs

# Publish spdlog package to prefix.dev

task m:q:mojo

```

- ✅ Compile and release Linux version, based on `orbstack` virtual machine

  - Note: each time you need to publish the ffi library for `3 OS versions` to prefix.dev first, then publish the spdlog package. (dependency order)

```bash

# List available virtual machines

orbctl list 

# Connect to linux-aarch64 architecture virtual machine, execute compile + publish

orbctl run -m u22dev

# Connect to linux-64 architecture virtual machine, execute compile + publish

orbctl run -m u22build

```

## Reference

### Mojo FFI Packages

- ✅ 

- ✅ 

### Python loguru

- ✅ 

### Rust spdlog

- ✅ 

### Rust FFI

- ✅ 

- ✅ 

  - 

  - 

- ✅ 

- ✅ 

[language-shield]: https://img.shields.io/badge/Mojo%F0%9F%94%A5-1.0.0b2-orange

[license-shield]: https://img.shields.io/github/license/better-mojo/jojo?logo=github

[license-url]: https://github.com/better-mojo/jojo/blob/main/LICENSE

[contributors-shield]: https://img.shields.io/badge/contributors-welcome!-blue

[contributors-url]: https://github.com/better-mojo/uuid#contributing

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