swift-doc

A package for generating documentation for Swift projects.

Given a directory of Swift files, swift-doc generates HTML or CommonMark (Markdown) files for each class, structure, enumeration, and protocol as well as top-level type aliases, functions, and variables.

Example Output

Requirements

Swift 5.2
GraphViz (optional)

Command-Line Utility

swift-doc can be used from the command-line on macOS and Linux.

Installation

Homebrew

Run the following command to install using Homebrew:

$ brew install swiftdocorg/formulae/swift-doc

Manually

Run the following commands to build and install manually:

$ git clone https://github.com/SwiftDocOrg/swift-doc
$ cd swift-doc
$ make install

Usage

OVERVIEW: A utility for generating documentation for Swift code.

USAGE: swift doc <subcommand>

OPTIONS:
  --version               Show the version.
  -h, --help              Show help information.

SUBCOMMANDS:
  generate                Generates Swift documentation
  coverage                Generates documentation coverage statistics for Swift
                          files
  diagram                 Generates diagram of Swift symbol relationships

Note: The swift driver provides extensibility through subcommands. If you type an unknown subcommand like swift foo, the system looks for a command called swift-foo in your PATH. This mechanism allows swift-doc to be run either directly or as swift doc.

swift-doc generate

OVERVIEW: Generates Swift documentation

USAGE: swift doc generate [<inputs> ...] --module-name <module-name> [--output <output>] [--format <format>] [--base-url <base-url>]

ARGUMENTS:
  <inputs>                One or more paths to Swift files 

OPTIONS:
  -n, --module-name <module-name>
                          The name of the module 
  -o, --output <output>   The path for generated output (default:
                          .build/documentation)
  -f, --format <format>   The output format (default: commonmark)
  --base-url <base-url>   The base URL used for all relative URLs in generated
                          documents. (default: /)
  -h, --help              Show help information.

The generate subcommand takes one or more paths and enumerates them recursively, collecting all Swift files into a single "module" and generating documentation accordingly.

$ swift doc generate path/to/SwiftProject/Sources --module-name SwiftProject
$ tree .build/documentation
$ documentation/
├── Home
├── (...)
├── _Footer.md
└── _Sidebar.md

By default, output files are written to .build/documentation in CommonMark / GitHub Wiki format, but you can change that with the --output and --format option flags.

$ swift doc generate path/to/SwiftProject/Sources --module-name SwiftProject --output Documentation --format html
$ Documentation/
├── (...)
└── index.html

swift-doc coverage

OVERVIEW: Generates documentation coverage statistics for Swift files

USAGE: swift doc coverage [<inputs> ...] [--output <output>]

ARGUMENTS:
  <inputs>                One or more paths to Swift files 

OPTIONS:
  -o, --output <output>   The path for generated report 
  -h, --help              Show help information.

The coverage subcommand generates documentation coverage statistics for Swift files.

$ git clone https://github.com/SwiftDocOrg/SwiftSemantics.git

$ swift run swift-doc coverage SwiftSemantics/Sources --output "dcov.json"
$ cat dcov.json | jq ".data.totals"
{
  "count": 207,
  "documented": 199,
  "percent": 96.1352657004831
}

$ cat dcov.json | jq ".data.symbols[] | select(.documented == false)"
{
  "file": "SwiftSemantics/Supporting Types/GenericRequirement.swift",
  "line": 67,
  "column": 6,
  "name": "GenericRequirement.init?(_:)",
  "type": "Initializer",
  "documented": false
}
...

While there are plenty of tools for assessing test coverage for code, we weren't able to find anything analogous for documentation coverage. To this end, we've contrived a simple JSON format inspired by llvm-cov.

If you know of an existing standard that you think might be better suited for this purpose, please reach out by opening an Issue!

swift-doc diagram

OVERVIEW: Generates diagram of Swift symbol relationships

USAGE: swift doc diagram [<inputs> ...]

ARGUMENTS:
  <inputs>                One or more paths to Swift files 

OPTIONS:
  -h, --help              Show help information.

The diagram subcommand generates a graph of APIs in DOT format that can be rendered by GraphViz into a diagram.

$ swift run swift-doc diagram Alamofire/Source > Alamofire.gv
$ head Alamofire.gv
digraph Anonymous {
  "Session" [shape=box];
  "NetworkReachabilityManager" [shape=box];
  "URLEncodedFormEncoder" [shape=box,peripheries=2];
  "ServerTrustManager" [shape=box];
  "MultipartFormData" [shape=box];

  subgraph cluster_Request {
    "DataRequest" [shape=box];
    "Request" [shape=box];

$ dot -T svg Alamofire.gv > Alamofire.svg

Here's an excerpt of the graph generated for Alamofire:

GitHub Action

This repository also hosts a GitHub Action that you can incorporate into your project's workflow.

The CommonMark files generated by swift-doc are formatted for publication to your project's GitHub Wiki, which you can do with github-wiki-publish-action. Alternatively, you could specify HTML format to publish documentation to GitHub Pages or bundle them into a release artifact.

Inputs

inputs: A path to a directory containing Swift (.swift) files in your workspace. (Default: "./Sources")
format: The output format ("commonmark" or "html") (Default: "commonmark")
module-name: The name of the module.
output: The path for generated output. (Default: "./.build/documentation")

Example Workflow

# .github/workflows/documentation.yml
name: Documentation

on: [push]

jobs:
  build:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v1
      - name: Generate Documentation
        uses: SwiftDocOrg/swift-doc@master
        with:
          inputs: "Sources"
          module-name: MyLibrary
          output: "Documentation"
      - name: Upload Documentation to Wiki
        uses: SwiftDocOrg/github-wiki-publish-action@v1
        with:
          path: "Documentation"
        env:
          GH_PERSONAL_ACCESS_TOKEN: ${{ secrets.GH_PERSONAL_ACCESS_TOKEN }}

Development

Web Assets

CSS assets used by the HTML output format are processed and generated by PostCSS. To make changes to these assets, you'll need to have Node.js and a package manager, such as npm, installed on your machine.

Navigate to the .node directory and run npm install to download the required tools and libraries.

$ cd .node
$ npm install

Note: package.json is located at a hidden .node subdirectory to prevent Xcode from displaying or indexing the contents of node_modules when opening the main project.

From the .node directory, run the watch script to start watching for changes to files in the Assets folder. Whenever an asset source file is added, removed, or updated, its corresponding (unoptimized) product is automatically generated in the Resources folder.

$ npm run watch

When you're happy with the results, commit any changes to the source files in Assets as well as the generated files in Resources.

$ git add Assets Resources
$ git commit

License

MIT

Contact

Mattt (@mattt)

muizidn / swift-doc