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The code you provided defines a Local struct and implements the Fetcher interface for retrieving local Timoni modules.

Local Struct:

• src: The source path of the local module, trimmed of the “file://” prefix.
• dst: The destination path where the module will be copied.
• requiredFiles: A list of required files within the module directory (cue.mod/module.cue, timoni.cue, values.cue).

NewLocal Function:

• Creates a new Local instance with the given source and destination paths.
• Initializes the requiredFiles slice with the expected file paths.

GetModuleRoot Method:

• Returns the path to the module’s root directory within the destination path, which is dst/module.

Fetch Method:

• Checks if the source path (src) exists and is a directory. If not, it returns an error.
• Verifies that all required files exist within the module directory. If any are missing, it returns an error.
• Creates a ModuleReference struct:
• Repository: The source path of the module.
• Version: The default development version (“devel”).
• Digest: “unknown” as it’s a local module.
• Copies the module from the source to the module root directory (dst/module) using the engine.CopyModule function.
• Returns the ModuleReference and any error that occurred during the copy process.

Purpose:

This code allows Timoni to retrieve CUE modules that are located locally on the file system. It ensures the necessary files are present within the module and copies them to the specified destination for further processing.

Key Points:

• The Local struct represents a local module source.
• The NewLocal function initializes a new Local instance.
• The GetModuleRoot method provides the module’s root directory.
• The Fetch method performs the retrieval and copying of the module, and returns metadata about the module.
• The engine.CopyModule function handles the actual file copying process.

Overall:

This code defines a simple yet efficient way to handle local Timoni module retrieval and ensures that the necessary files are present for successful module compilation.