onecfg

One config file to generate them all.

onecfg provides an efficient solution for managing config files in projects that use multiple tools with interdependent configurations. It introduces the concept of onecfg files, which are JSON-based files that store the necessary information to generate and customize config files for different tools. These onecfg files can be shared, extended, and loaded via HTTPS from any location, enabling users to create customized configurations tailored to their specific needs.

This approach addresses two main challenges: first, it eliminates the repetitive nature of config files and reduces the need for manual updates across projects. Second, it simplifies the complexity of managing configurations when working with a combination of different tools.

Installation

You can install onecfg using Cargo:

cargo install onecfg

Usage

Before you can generate config files with onecfg, you'll need to create a onecfg.json file in your project's root directory. This file will define how the config files should be generated, as well as any customizations you'd like to make.

To generate the config files, use the following command:

onecfg onecfg.json

To quickly get started with onecfg, you can use the onecfg-lib library. It is a collection of onecfg files specifically designed to configure TypeScript and Rust projects. By extending these predefined onecfg files, you can easily set up your project without having to create your own configurations from scratch.

To use the onecfg-lib library, simply include the desired onecfg files in the extends section of your project's onecfg.json file. For example:

{
  "extends": [
    "https://raw.githubusercontent.com/clebert/onecfg-lib/main/lib/onecfg-editorconfig.json",
    "https://raw.githubusercontent.com/clebert/onecfg-lib/main/lib/onecfg-git.json",
    "https://raw.githubusercontent.com/clebert/onecfg-lib/main/lib/onecfg-prettier.json",
    "https://raw.githubusercontent.com/clebert/onecfg-lib/main/lib/onecfg-vscode.json"
  ]
}

In this example, the onecfg.json file extends four different onecfg files from the onecfg-lib library, which are specifically designed for configuring EditorConfig, Git, Prettier, and Visual Studio Code. By extending these files, your project will be set up with the recommended configuration for each tool.

You can find more onecfg files for TypeScript and Rust projects in the onecfg-lib repository.

Note: You can use the JSON Schema to validate your onecfg file or enable autocompletion in the editor.

Defining the format of the config files to be generated

In your onecfg.json file, you can define the format of the config files as shown below:

{
  "defines": {
    ".gitignore": {"format": "ignorefile"},
    ".prettierrc.json": {"format": "json"}
  }
}

It's important to note that only config files directly or indirectly defined in an extended onecfg file can be generated and patched. A config file under a specific path should only be defined once across all extended onecfg files.

When extending onecfg files, ensure that there are no conflicting definitions for the same file paths. If a conflict occurs, you may need to either modify your custom onecfg.json file or create a new onecfg file to resolve the issue.

Declaring patches specific to certain config files

You can declare patches specific to certain config files in your onecfg.json file:

{
  "patches": {
    ".gitignore": [{"value": ["/dist"]}],
    ".prettierrc.json": [{"value": {"printWidth": 80, "singleQuote": true}}]
  }
}

It's crucial to understand that patches for undefined files will have no effect and will not negatively impact the configuration process. This has the advantage of allowing you to plan integration patches for tools that may not be used in a specific project. If the tool is not being used, the corresponding configuration won't be applied, thus preventing any unnecessary configurations from being generated.

Config formats

onecfg supports various config formats including text, json, toml, yaml, and ignorefile. You can define the format of a config file in the defines section of your onecfg.json file, and provide patches to customize the values.

text

{
  "defines": {
    "test.txt": {"format": "text"}
  },
  "patches": {
    "test.txt": [{"value": "foo"}, {"value": "bar"}]
  }
}

bar

json

{
  "defines": {
    "test.json": {"format": "json"}
  },
  "patches": {
    "test.json": [{"value": {"foo": "bar"}}, {"value": {"baz": "qux"}}]
  }
}

{
  "baz": "qux",
  "foo": "bar"
}

toml

{
  "defines": {
    "test.toml": {"format": "toml"}
  },
  "patches": {
    "test.toml": [{"value": {"foo": "bar"}}, {"value": {"baz": "qux"}}]
  }
}

baz = "qux"
foo = "bar"

yaml

{
  "defines": {
    "test.yml": {"format": "yaml"}
  },
  "patches": {
    "test.yml": [{"value": {"foo": "bar"}}, {"value": {"baz": "qux"}}]
  }
}

baz: qux
foo: bar

ignorefile

{
  "defines": {
    ".testignore": {"format": "ignorefile"}
  },
  "patches": {
    ".testignore": [{"value": ["foo", "bar"]}, {"value": ["baz"]}]
  }
}

foo
bar
baz

License

Licensed under either of

• Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.