Merge pull request #354 from russross/readme-for-v2
Document V2 in master README
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Vytautas Šaltenis
GitHub
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README.md
149
README.md
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Blackfriday [](https://travis-ci.org/russross/blackfriday) [](https://godoc.org/github.com/russross/blackfriday)
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Blackfriday
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[![Build Status][BuildSVG]][BuildURL]
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[![Godoc][GodocV2SVG]][GodocV2URL]
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===========
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Blackfriday is a [Markdown][1] processor implemented in [Go][2]. It
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@ -8,7 +10,7 @@ punctuation substitutions, etc.), and it is safe for all utf-8
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(unicode) input.
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HTML output is currently supported, along with Smartypants
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extensions. An experimental LaTeX output engine is also included.
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extensions.
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It started as a translation from C of [Sundown][3].
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@ -16,26 +18,71 @@ It started as a translation from C of [Sundown][3].
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Installation
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------------
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Blackfriday is compatible with Go 1. If you are using an older
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release of Go, consider using v1.1 of blackfriday, which was based
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on the last stable release of Go prior to Go 1. You can find it as a
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tagged commit on github.
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Blackfriday is compatible with any modern Go release. With Go and git installed:
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With Go 1 and git installed:
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go get -u gopkg.in/russross/blackfriday.v2
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go get github.com/russross/blackfriday
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will download, compile, and install the package into your `$GOPATH` directory
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hierarchy.
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will download, compile, and install the package into your `$GOPATH`
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directory hierarchy. Alternatively, you can achieve the same if you
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import it into a project:
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import "github.com/russross/blackfriday"
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Versions
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--------
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Currently maintained and recommended version of Blackfriday is `v2`. It's being
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developed on its own branch: https://github.com/russross/blackfriday/v2 and the
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documentation is available at
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https://godoc.org/gopkg.in/russross/blackfriday.v2.
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It is `go get`-able via via [gopkg.in][6] at `gopkg.in/russross/blackfriday.v2`,
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but we highly recommend using package management tool like [dep][7] or
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[Glide][8] and make use of semantic versioning. With package management you
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should import `github.com/russross/blackfriday` and specify that you're using
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version 2.0.0.
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Version 2 offers a number of improvements over v1:
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* Cleaned up API
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* A separate call to [`Parse`][4], which produces an abstract syntax tree for
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the document
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* Latest bug fixes
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* Flexibility to easily add your own rendering extensions
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Potential drawbacks:
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* Our benchmarks show v2 to be slightly slower than v1. Currently in the
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ballpark of around 15%.
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* API breakage. If you can't afford modifying your code to adhere to the new API
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and don't care too much about the new features, v2 is probably not for you.
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* Several bug fixes are trailing behind and still need to be forward-ported to
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v2. See issue [#348](https://github.com/russross/blackfriday/issues/348) for
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tracking.
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If you are still interested in the legacy `v1`, you can import it from
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`github.com/russross/blackfriday`. Documentation for the legacy v1 can be found
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here: https://godoc.org/github.com/russross/blackfriday
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### Known issue with `dep`
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There is a known problem with using Blackfriday v1 _transitively_ and `dep`.
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Currently `dep` prioritizes semver versions over anything else, and picks the
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latest one, plus it does not apply a `[[constraint]]` specifier to transitively
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pulled in packages. So if you're using something that uses Blackfriday v1, but
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that something does not use `dep` yet, you will get Blackfriday v2 pulled in and
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your first dependency will fail to build.
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There are couple of fixes for it, documented here:
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https://github.com/golang/dep/blob/master/docs/FAQ.md#how-do-i-constrain-a-transitive-dependencys-version
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Meanwhile, `dep` team is working on a more general solution to the constraints
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on transitive dependencies problem: https://github.com/golang/dep/issues/1124.
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and `go get` without parameters.
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Usage
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-----
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### v1
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For basic usage, it is as simple as getting your input into a byte
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slice and calling:
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@ -46,34 +93,57 @@ feature set, use this instead:
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output := blackfriday.MarkdownCommon(input)
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### v2
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For the most sensible markdown processing, it is as simple as getting your input
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into a byte slice and calling:
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```go
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output := blackfriday.Run(input)
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```
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Your input will be parsed and the output rendered with a set of most popular
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extensions enabled. If you want the most basic feature set, corresponding with
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the bare Markdown specification, use:
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```go
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output := blackfriday.Run(input, blackfriday.WithNoExtensions())
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```
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### Sanitize untrusted content
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Blackfriday itself does nothing to protect against malicious content. If you are
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dealing with user-supplied markdown, we recommend running blackfriday's output
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through HTML sanitizer such as
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[Bluemonday](https://github.com/microcosm-cc/bluemonday).
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dealing with user-supplied markdown, we recommend running Blackfriday's output
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through HTML sanitizer such as [Bluemonday][5].
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Here's an example of simple usage of blackfriday together with bluemonday:
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Here's an example of simple usage of Blackfriday together with Bluemonday:
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``` go
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```go
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import (
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"github.com/microcosm-cc/bluemonday"
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"github.com/russross/blackfriday"
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"gopkg.in/russross/blackfriday.v2"
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)
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// ...
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unsafe := blackfriday.MarkdownCommon(input)
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unsafe := blackfriday.Run(input)
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html := bluemonday.UGCPolicy().SanitizeBytes(unsafe)
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```
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### Custom options
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### Custom options, v1
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If you want to customize the set of options, first get a renderer
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(currently either the HTML or LaTeX output engines), then use it to
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(currently only the HTML output engine), then use it to
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call the more general `Markdown` function. For examples, see the
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implementations of `MarkdownBasic` and `MarkdownCommon` in
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`markdown.go`.
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### Custom options, v2
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If you want to customize the set of options, use `blackfriday.WithExtensions`,
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`blackfriday.WithRenderer` and `blackfriday.WithRefOverride`.
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### `blackfriday-tool`
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You can also check out `blackfriday-tool` for a more complete example
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of how to use it. Download and install it using:
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@ -249,7 +319,7 @@ are a few of note:
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* [github_flavored_markdown](https://godoc.org/github.com/shurcooL/github_flavored_markdown):
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provides a GitHub Flavored Markdown renderer with fenced code block
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highlighting, clickable header anchor links.
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highlighting, clickable heading anchor links.
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It's not customizable, and its goal is to produce HTML output
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equivalent to the [GitHub Markdown API endpoint](https://developer.github.com/v3/markdown/#render-a-markdown-document-in-raw-mode),
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@ -258,27 +328,18 @@ are a few of note:
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* [markdownfmt](https://github.com/shurcooL/markdownfmt): like gofmt,
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but for markdown.
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* LaTeX output: renders output as LaTeX. This is currently part of the
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main Blackfriday repository, but may be split into its own project
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in the future. If you are interested in owning and maintaining the
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LaTeX output component, please be in touch.
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It renders some basic documents, but is only experimental at this
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point. In particular, it does not do any inline escaping, so input
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that happens to look like LaTeX code will be passed through without
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modification.
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* [Md2Vim](https://github.com/FooSoft/md2vim): transforms markdown files into vimdoc format.
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* [LaTeX output](https://bitbucket.org/ambrevar/blackfriday-latex):
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renders output as LaTeX.
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Todo
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TODO
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----
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* More unit testing
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* Improve unicode support. It does not understand all unicode
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* Improve Unicode support. It does not understand all Unicode
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rules (about what constitutes a letter, a punctuation symbol,
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etc.), so it may fail to detect word boundaries correctly in
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some instances. It is safe on all utf-8 input.
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some instances. It is safe on all UTF-8 input.
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License
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@ -287,6 +348,16 @@ License
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[Blackfriday is distributed under the Simplified BSD License](LICENSE.txt)
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[1]: http://daringfireball.net/projects/markdown/ "Markdown"
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[2]: http://golang.org/ "Go Language"
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[1]: https://daringfireball.net/projects/markdown/ "Markdown"
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[2]: https://golang.org/ "Go Language"
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[3]: https://github.com/vmg/sundown "Sundown"
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[4]: https://godoc.org/gopkg.in/russross/blackfriday.v2#Parse "Parse func"
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[5]: https://github.com/microcosm-cc/bluemonday "Bluemonday"
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[6]: https://labix.org/gopkg.in "gopkg.in"
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[7]: https://github.com/golang/dep/ "dep"
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[8]: https://github.com/Masterminds/glide "Glide"
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[BuildSVG]: https://travis-ci.org/russross/blackfriday.svg?branch=master
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[BuildURL]: https://travis-ci.org/russross/blackfriday
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[GodocV2SVG]: https://godoc.org/gopkg.in/russross/blackfriday.v2?status.svg
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[GodocV2URL]: https://godoc.org/gopkg.in/russross/blackfriday.v2
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