mojo-toml v0.4.0 - TOML Writer Release πŸ”₯

TL;DR: mojo-toml now supports writing TOML files! Build configs programmatically and serialize to TOML format with full round-trip fidelity.

What’s New

v0.4.0 adds complete TOML serialization:

from toml import to_toml, TomlValue

fn main() raises:
    // Build configuration
    var config = Dict[String, TomlValue]()
    
    var app = Dict[String, TomlValue]()
    app["name"] = TomlValue("MyApp")
    app["version"] = TomlValue("1.0.0")
    app["debug"] = TomlValue(True)
    config["app"] = TomlValue(app^)
    
    var db = Dict[String, TomlValue]()
    db["host"] = TomlValue("localhost")
    db["port"] = TomlValue(5432)
    config["database"] = TomlValue(db^)
    
    // Write to file
    var toml_str = to_toml(config)
    with open("config.toml", "w") as f:
        f.write(toml_str)

Output:

[app]
name = "MyApp"
version = "1.0.0"
debug = true
[database]
host = "localhost"
port = 5432

Features

  • βœ… to_toml() function for Dict β†’ TOML string conversion
  • βœ… All types: strings, integers, floats, booleans, arrays, tables
  • βœ… String escaping, nested structures, table headers
  • βœ… Round-trip verified: parse β†’ modify β†’ write β†’ parse preserves semantics
  • βœ… 41 new tests (137 total: 96 parser + 41 writer)

Installation

Git submodule:

git submodule add https://github.com/databooth/mojo-toml vendor/mojo-toml
mojo -I vendor/mojo-toml/src your_app.mojo

Direct copy:

git clone https://github.com/databooth/mojo-toml
cp -r mojo-toml/src/toml your-project/lib/toml
mojo -I your-project/lib your_app.mojo

Roadmap

v0.5.0: TOML 1.0 completion - array of tables [[section]], hex/octal/binary integers
v0.6.0: Comparative Python benchmarks, memory profiling
Future: Separate mojo-ini package for INI file support

Zero Python dependencies. Pure Mojo. MIT licensed.

Feedback and contributions welcome! πŸš€