jacobbednarz / terraform-plugin-docs

Generate and validate Terraform plugin/provider documentation.

terraform-plugin-docs

This repository contains tools and packages for creating Terraform plugin docs (currently only provider plugins). The primary way users will interact with this is the tfplugindocs CLI tool to generate and validate plugin documentation.

tfplugindocs

The tfplugindocs CLI has two main commands, validate and generate (generate is the default). This tool will let you generate documentation for your provider from live example .tf files and markdown templates. It will also export schema information from the provider (using terraform providers schema -json), and sync the schema with the reference documents.

If your documentation only consists of simple examples and schema information, the tool can also generate missing template files to make website creation extremely simple for most providers.

Installation

You can install a copy of the binary manually from the releases, or you can optionally use the tools.go model for tool installation.

Usage

$ tfplugindocs --help
Usage: tfplugindocs [--version] [--help] <command> [<args>]

Available commands are:
                the generate command is run by default
    generate    generates a plugin website from code, templates, and examples for the current directory
    validate    validates a plugin website for the current directory
       

generate command:

$ tfplugindocs generate --help

Usage: tfplugindocs generate [<args>]

    --examples-dir <ARG>             examples directory                                                        (default: "examples")
    --ignore-deprecated <ARG>        don't generate documentation for deprecated resources and data-sources    (default: "false")
    --legacy-sidebar <ARG>           generate the legacy .erb sidebar file                                     (default: "false")
    --provider-name <ARG>            provider name, as used in Terraform configurations
    --rendered-provider-name <ARG>   provider name, as generated in documentation (ex. page titles, ...)
    --rendered-website-dir <ARG>     output directory                                                          (default: "docs")
    --tf-version <ARG>               terraform binary version to download
    --website-source-dir <ARG>       templates directory                                                       (default: "templates")
    --website-temp-dir <ARG>         temporary directory (used during generation)

validate command:

$ tfplugindocs validate --help

Usage: tfplugindocs validate [<args>]

How it Works

When you run tfplugindocs from root directory of the provider the tool takes the following actions:

• Copy all the templates and static files to a temporary directory
• Build (go build) a temporary binary of the provider source code
• Collect schema information using terraform providers schema -json
• Generate a default provider template file, if missing (index.md)
• Generate resource template files, if missing
• Generate data source template files, if missing
• Copy all non-template files to the output website directory
• Process all the remaining templates to generate files for the output website directory

For inspiration, you can look at the templates and output of the terraform-provider-random and terraform-provider-tls. You can browse their respective docs on the Terraform Registry, here and here.

About the id attribute

If the provider schema didn't set id for the given resource/data-source, the documentation generated will place it under the "Read Only" section and provide a simple description.

Otherwise, the provider developer can set an arbitrary description like this:

    // ...
    Schema: map[string]*schema.Schema{
        // ...
        "id": {
            Type:     schema.TypeString,
            Computed: true,
            Description: "Unique identifier for this resource",
		},
        // ...
    }
    // ...

Conventional Paths

The generation of missing documentation is based on a number of assumptions / conventional paths.

For templates:

Path	Description
templates/	Root of templated docs
templates/index.md[.tmpl]	Docs index page (or template)
templates/data-sources.md[.tmpl]	Generic data source page (or template)
templates/data-sources/<data source name>.md[.tmpl]	Data source page (or template)
templates/resources.md[.tmpl]	Generic resource page (or template)
templates/resources/<resource name>.md[.tmpl]	Resource page (or template)

Note: the .tmpl extension is necessary, for the file to be correctly handled as a template.

For examples:

Path	Description
examples/	Root of examples
examples/provider/provider.tf	Provider example config
examples/data-sources/<data source name>/data-source.tf	Data source example config
examples/resources/<resource name>/resource.tf	Resource example config
examples/resources/<resource name>/import.sh	Resource example import command

Templates

The templates are implemented with Go text/template using the following data fields and functions:

Data fields

Provider

Field	Type	Description
.Description	string	Provider description
.HasExample	bool	Is there an example file?
.ExampleFile	string	Path to the file with the terraform configuration example
.ProviderName	string	Canonical provider name (ex. terraform-provider-random)
.ProviderShortName	string	Short version of the provider name (ex. random)
.RenderedProviderName	string	Value provided via argument --rendered-provider-name, otherwise same as .ProviderName

Resources / Data Source

Field	Type	Description
.Name	string	Name of the resource/data-source (ex. tls_certificate)
.Type	string	Either Resource or Data Source
.Description	string	Resource / Data Source description
.HasExample	bool	Is there an example file?
.ExampleFile	string	Path to the file with the terraform configuration example
.HasImport	bool	Is there an import file?
.ImportFile	string	Path to the file with the command for importing the resource
.ProviderName	string	Canonical provider name (ex. terraform-provider-random)
.ProviderShortName	string	Short version of the provider name (ex. random)
.RenderedProviderName	string	Value provided via argument --rendered-provider-name, otherwise same as .ProviderName

Functions

Function	Description
codefile	Create a Markdown code block with the content of a file. Path is relative to the repository root.
lower	Equivalent to strings.ToLower.
plainmarkdown	Render Markdown content as plaintext.
prefixlines	Add a prefix to all (newline-separated) lines in a string.
split	Split string into sub-strings, by a given separator (ex. split .Name "_").
title	Equivalent to cases.Title.
tffile	A special case of the codefile function, designed for Terraform files (i.e. .tf).
trimspace	Equivalent to strings.TrimSpace.
upper	Equivalent to strings.ToUpper.

Disclaimer

This is still under development: while it's being used for production-ready providers, you might still find bugs and limitations. In those cases, please report issues or, if you can, submit a pull-request.

Your help and patience is truly appreciated.