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Explanation
This code generates YAML documentation for the Kubectl command and its sub-commands. Here’s a breakdown of the code:
1. Data Structures:
cmdOption
: Represents a command-line option, holding its name, shorthand, default value, and usage string.cmdDoc
: Represents a command’s documentation, containing its name, synopsis, description, options, inherited options, example usage, and related commands (SeeAlso
).
2. Main Function:
- Sets the output directory (defaults to
docs/yaml/kubectl
). - Sets environment variables to ensure consistent output.
- Uses
cmd.NewKubectlCommand
to create a Kubectl command object. - Calls
genYaml
to generate YAML documentation for the Kubectl command and each of its sub-commands.
3. forceMultiLine
Function:
- A workaround for YAML library issues with long, single-line strings. Ensures long strings are multi-line for better readability in the YAML output.
4. genFlagResult
Function:
- Takes a
pflag.FlagSet
object (representing command-line flags). - Iterates through all flags and extracts relevant information to create a list of
cmdOption
structs, which represent the flags in the YAML format.
5. genYaml
Function:
- Takes a
cobra.Command
(representing a Kubectl command), its parent command (if any), and the output directory. - Extracts information from the command: name, synopsis, description, examples, and related commands.
- Processes the command’s flags and inherited flags using
genFlagResult
to populate theOptions
andInheritedOptions
fields of thecmdDoc
struct. - Marshals the
cmdDoc
struct into YAML usingyaml.Marshal
. - Constructs the filename based on the command name and its parent, and writes the YAML to the output file.
Overall Functionality:
The code iterates through the Kubectl command and its sub-commands, extracting information like name, synopsis, description, options, and examples. This information is then formatted into YAML and saved to individual files within the specified output directory.
Key Points:
- The code leverages the
cobra
andpflag
libraries for command-line argument parsing and flag management. - It utilizes the
yaml.Marshal
function to convert Go data structures to YAML. - The
forceMultiLine
function addresses a limitation in the YAML library for handling long strings.
Potential Improvements:
- The code could be made more robust by handling errors more gracefully.
- The
forceMultiLine
workaround could be replaced with a more elegant solution, such as using a custom YAML encoder. - The code could be extended to generate documentation for other Kubernetes tools and resources.
Graph
The graph shows the usage of functions within the codebase.
Select a code symbol to view it's graph