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This code is a simple YAML formatter. It takes YAML files as input and outputs the formatted version of the files.

Main Function main()

• The program first defines a flag -indent to control the indentation level, defaulting to 2 spaces.
• It parses the command-line arguments to get the input file paths.
• It iterates through each input file:
• It reads the YAML content from the file using os.ReadFile.
• It parses the YAML content into a yaml.Node using fetchYaml.
• It opens the same file for writing (truncating the existing content) using os.OpenFile.
• It formats and writes the YAML content to the file using streamYaml.
• Error handling is done in each step by printing error messages to stderr if any error occurs.

fetchYaml()

• It takes the YAML content as a byte slice.
• It unmarshals the content into a yaml.Node using yaml.Unmarshal.
• If there’s an error during unmarshalling, it returns an error.
• Otherwise, it returns the parsed yaml.Node.

streamYaml()

• It takes the output writer, indentation level, and the parsed YAML node as input.
• It creates a new yaml.Encoder with the provided writer.
• It sets the indentation level for the encoder.
• It encodes the YAML node using the encoder’s Encode method.
• If there’s an error during encoding, it returns an error.
• It closes the encoder using encoder.Close().

Overall

The code demonstrates a basic YAML formatter using the gopkg.in/yaml.v3 package. It reads YAML from files, parses the content, formats it with indentation, and writes the formatted content back to the same files.