helixml / dagger

Code Generation

The dagger.gen.go file is generated by the dagger.gen.go.go file. This process is essential for building the Dagger CLI.

Code Generation Process

The code generation process takes place in dagger.gen.go.go. It’s used to generate dagger.gen.go, which is the source for the dagger binary’s command-line interface (CLI).

The code generation is driven by the following steps:

  1. Parsing Daggerfiles: It starts by parsing Daggerfiles, which are configuration files defining the building blocks of Dagger workflows.
  2. Building the DAG (Directed Acyclic Graph): It then builds a DAG (Directed Acyclic Graph) representing the dependencies between these building blocks. This DAG reflects the workflow execution order.
  3. Generating the CLI: Finally, it generates the CLI using the dagger.gen.go file based on the parsed Daggerfiles and the constructed DAG.

Options

There are several options available for customizing the code generation process.

-o or --output

This option controls the output path of the generated dagger.gen.go file.

Example:

dagger.gen.go.go -o ./dagger/gen.go

-n or --name

This option lets you specify a custom name for the generated file. By default, it’s dagger.gen.go.

Example:

dagger.gen.go.go -n custom_file.go

-p or --package

This option lets you define the package name for the generated code. By default, it’s main.

Example:

dagger.gen.go.go -p dagger_cli

-s or --source

This option lets you specify a custom source path for Daggerfiles, which define the Dagger workflows.

Example:

dagger.gen.go.go -s ./workflows/

Examples

Here are some examples demonstrating how to use these options:

Example 1: Generating the CLI with a custom package name

dagger.gen.go.go -p dagger_cli

Example 2: Generating the CLI with a custom output path and file name

dagger.gen.go.go -o ./custom_path/custom_file.go

Example 3: Generating the CLI with a custom source path

dagger.gen.go.go -s ./custom_workflows/

Importance of Code Generation

The code generation approach allows for a dynamic and flexible CLI, adapting to the ever-evolving configuration defined in Daggerfiles. This method reduces manual coding and ensures consistency by reflecting the DAG directly in the CLI code.