goreadme

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Published: Sep 28, 2021 License: MIT Imports: 16 Imported by: 1

README

goreadme

Build Status codecov GoDoc

Package goreadme generates readme markdown file from go doc.

The package can be used as a command line tool and as Github action, described below:

Github Action

Github actions can be configured to update the README file automatically every time it is needed. Below there is an example that on every time a new change is pushed to the main branch, the action is trigerred, generates a new README file, and if there is a change - commits and pushes it to the main branch. In pull requests that affect the README content, if the GITHUB_TOKEN is given, the action will post a comment on the pull request with changes that will be made to the README file.

To use this with Github actions, add the following content to .github/workflows/goreadme.yml. See ./action.yml for all available input options.

on:
  push:
    branches: [main]
  pull_request:
    branches: [main]
permissions:
  # Goreadme needs permissions to update pull requests comments and change contents.
  pull-requests: write
  contents: write
jobs:
    goreadme:
        runs-on: ubuntu-latest
        steps:
        - name: Check out repository
          uses: actions/checkout@v2
        - name: Update readme according to Go doc
          uses: posener/goreadme@v1
          with:
            badge-travisci: 'true'
            badge-codecov: 'true'
            badge-godoc: 'true'
            badge-goreadme: 'true'
            # Optional: Token allows goreadme to comment the PR with diff preview.
            GITHUB_TOKEN: '${{ secrets.GITHUB_TOKEN }}'

Use as a command line tool

$ GO111MODULE=on go get github.com/posener/goreadme/cmd/goreadme
$ goreadme -h

Why Should You Use It

Both Go doc and readme files are important. Go doc to be used by your user's library, and README file to welcome users to use your library. They share common content, which is usually duplicated from the doc to the readme or vice versa once the library is ready. The problem is that keeping documentation updated is important, and hard enough - keeping both updated is twice as hard.

Go Doc Instructions

The formatting of the README.md is done by the go doc parser. This makes the result README.md a bit more limited. Currently, goreadme supports the formatting as explained in godoc page, or here. Meaning:

  • A header is a single line that is separated from a paragraph above.

  • Code block is recognized by indentation as Go code.

func main() {
  ...
}

Additionally, the syntax was extended to include some more markdown features while keeping the Go doc readable:

  • Bulleted and numbered lists are possible when each bullet item is followed by an empty line.

  • Diff blocks are automatically detected when each line in a code block starts with a ' ', '-' or '+':

-removed line starts with '-'
 remained line starts with ' '
+added line starts with '+'
  • A repository file can be linked when providing a path that start with [./](./): ./goreadme.go.

  • A link can have a link text by prefixing it with parenthesised text: goreadme page.

  • A link to repository file and can have a link text: goreadme main file.

  • An image can be added by prefixing a link to an image with (image/<image title>):

title of image

Testing

The goreadme tests the test cases in the ./testdata directory. It generates readme files for all the packages in that directory and asserts that the result readme matches the existing one. When modifying goreadme behavior, there is no need to manually change these readme files. It is possible to run WRITE_READMES=1 go test ./... which regenerates them and check the changes match the expected (optionally using git diff).

Sub Packages

  • cmd/goreadme: Goreadme command line tool and Github action

Readme created from Go doc with goreadme

Documentation

Overview

Package goreadme generates readme markdown file from go doc.

The package can be used as a command line tool and as Github action, described below:

Github Action

Github actions can be configured to update the README file automatically every time it is needed. Below there is an example that on every time a new change is pushed to the main branch, the action is trigerred, generates a new README file, and if there is a change - commits and pushes it to the main branch. In pull requests that affect the README content, if the `GITHUB_TOKEN` is given, the action will post a comment on the pull request with changes that will be made to the README file.

To use this with Github actions, add the following content to `.github/workflows/goreadme.yml`. See ./action.yml for all available input options.

on:
  push:
    branches: [main]
  pull_request:
    branches: [main]
permissions:
  # Goreadme needs permissions to update pull requests comments and change contents.
  pull-requests: write
  contents: write
jobs:
    goreadme:
        runs-on: ubuntu-latest
        steps:
        - name: Check out repository
          uses: actions/checkout@v2
        - name: Update readme according to Go doc
          uses: posener/goreadme@v1
          with:
            badge-travisci: 'true'
            badge-codecov: 'true'
            badge-godoc: 'true'
            badge-goreadme: 'true'
            # Optional: Token allows goreadme to comment the PR with diff preview.
            GITHUB_TOKEN: '${{ secrets.GITHUB_TOKEN }}'

Use as a command line tool

$ GO111MODULE=on go get github.com/posener/goreadme/cmd/goreadme
$ goreadme -h

Why Should You Use It

Both Go doc and readme files are important. Go doc to be used by your user's library, and README file to welcome users to use your library. They share common content, which is usually duplicated from the doc to the readme or vice versa once the library is ready. The problem is that keeping documentation updated is important, and hard enough - keeping both updated is twice as hard.

Go Doc Instructions

The formatting of the README.md is done by the go doc parser. This makes the result README.md a bit more limited. Currently, `goreadme` supports the formatting as explained in (godoc page) https://blog.golang.org/godoc-documenting-go-code, or (here) https://pkg.go.dev/github.com/fluhus/godoc-tricks. Meaning:

* A header is a single line that is separated from a paragraph above.

* Code block is recognized by indentation as Go code.

func main() {
  ...
}

* Inline code is marked with `backticks`.

* URLs will just automatically be converted to links: https://github.com/posener/goreadme

Additionally, the syntax was extended to include some more markdown features while keeping the Go doc readable:

* Bulleted and numbered lists are possible when each bullet item is followed by an empty line.

* Diff blocks are automatically detected when each line in a code block starts with a `' '`, `'-'` or `'+'`:

-removed line starts with '-'
 remained line starts with ' '
+added line starts with '+'

* A repository file can be linked when providing a path that start with `./`: ./goreadme.go.

* A link can have a link text by prefixing it with parenthesised text: (goreadme page) https://github.com/posener/goreadme.

* A link to repository file and can have a link text: (goreadme main file) ./goreamde.go.

* An image can be added by prefixing a link to an image with `(image/<image title>)`:

(image/title of image) https://github.githubassets.com/images/icons/emoji/unicode/1f44c.png

Testing

The goreadme tests the test cases in the ./testdata directory. It generates readme files for all the packages in that directory and asserts that the result readme matches the existing one. When modifying goreadme behavior, there is no need to manually change these readme files. It is possible to run `WRITE_READMES=1 go test ./...` which regenerates them and check the changes match the expected (optionally using `git diff`).

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func Create

func Create(ctx context.Context, name string, w io.Writer) error

Create writes the content of readme.md to w, with the default client. name should be a Go repository name, such as "github.com/posener/goreadme".

Types

type Config

type Config struct {
	// Override readme title. Default is package name.
	Title string `json:"title"`
	// ImportPath is used to override the import path. For example: github.com/user/project,
	// github.com/user/project/package or github.com/user/project/version.
	ImportPath string `json:"import_path"`
	// Consts will make constants documentation to be added to the README.
	// If Types is specified, constants for each type will also be added to the README.
	Consts bool `json:"consts"`
	// Vars will make exported variables documentation to be added to the README.
	// If Types is specified, exported variables for each type will also be added to the README.
	Vars bool `json:"vars"`
	// Functions will make functions documentation to be added to the README.
	Functions bool `json:"functions"`
	// Types will make types documentation to be added to the README.
	Types bool `json:"types"`
	// Factories will make functions returning a type to be added to the README, if Types is also specified.
	// Has no effect if Types is not specified.
	Factories bool `json:"factories"`
	// Methods will make the methods for a type to be added to the README, if Types is also specified.
	// Has no effect if Types is not specified.
	Methods bool `json:"methods"`
	// SkipExamples will omit the examples section from the README.
	SkipExamples bool `json:"skip_examples"`
	// SkipSubPackages will omit the sub packages section from the README.
	SkipSubPackages bool `json:"skip_sub_packages"`
	// NoDiffBlocks disables marking code blocks as diffs if they start with minus or plus signes.
	NoDiffBlocks bool `json:"no_diff_blocks"`
	// RecursiveSubPackages will retrieved subpackages information recursively.
	// If false, only one level of subpackages will be retrieved.
	RecursiveSubPackages bool `json:"recursive_sub_packages"`
	Badges               struct {
		TravisCI     bool `json:"travis_ci"`
		CodeCov      bool `json:"code_cov"`
		GolangCI     bool `json:"golang_ci"`
		GoDoc        bool `json:"go_doc"`
		GoReportCard bool `json:"go_report_card"`
	} `json:"badges"`
	Credit bool `json:"credit"`
}

type GoReadme

type GoReadme struct {
	// contains filtered or unexported fields
}

GoReadme enables getting readme.md text from a go package.

func New

func New(c *http.Client) *GoReadme

New returns a GoReadme object with a custom client. client is an HTTP client used to perform the requests. It can be used to authenticate github requests, for example, a github client can be used:

oauth2.NewClient(ctx, oauth2.StaticTokenSource(
	&oauth2.Token{AccessToken: "...github access token..."
))

func (*GoReadme) Create

func (r *GoReadme) Create(ctx context.Context, name string, w io.Writer) error

Create writes the content of readme.md to w, with r's HTTP client. name should be a Go repository name, such as "github.com/posener/goreadme".

func (GoReadme) WithConfig

func (r GoReadme) WithConfig(cfg Config) *GoReadme

WithConfig returns a copy of the converter with the given configuration.

Directories

Path Synopsis
cmd
goreadme
Goreadme command line tool and Github action
Goreadme command line tool and Github action
internal

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