Giter VIP home page Giter VIP logo

goldmark-pdf's Introduction

goldmark-pdf

goldmark-pdf is a renderer for goldmark that allows rendering to PDF.

goldmark-pdf screenshot

Reference

See https://pkg.go.dev/github.com/stephenafamo/goldmark-pdf

Usage

Care has been taken to match the semantics of goldmark and its extensions.

The PDF renderer can be initiated with pdf.New() and the returned value satisfies goldmark's renderer.Renderer interface, so it can be passed to goldmark.New() using the goldmark.WithRenderer() option.

markdown := goldmark.New(
    goldmark.WithRenderer(pdf.New()),
)

Options can also be passed to pdf.New(), the options interface to be satisfied is:

// An Option interface is a functional option type for the Renderer.
type Option interface {
	SetConfig(*Config)
}

Here is the Config struct that is to be modified:

type Config struct {
	Context context.Context

	PDF PDF

	// A source for images
	ImageFS fs.FS

	// All other options have sensible defaults
	Styles Styles

	// A cache for the fonts
	FontsCache fonts.Cache

	// For debugging
	TraceWriter io.Writer

	NodeRenderers util.PrioritizedSlice
}

Some helper functions for adding options are already provided. See option.go

An example with some more options:

goldmark.New(
    goldmark.WithRenderer(
        pdf.New(
            pdf.WithTraceWriter(os.Stdout),
            pdf.WithContext(context.Background()),
            pdf.WithImageFS(os.DirFS(".")),
            pdf.WithLinkColor("cc4578"),
            pdf.WithHeadingFont(pdf.GetTextFont("IBM Plex Serif", pdf.FontLora)),
            pdf.WithBodyFont(pdf.GetTextFont("Open Sans", pdf.FontRoboto)),
            pdf.WithCodeFont(pdf.GetCodeFont("Inconsolata", pdf.FontRobotoMono)),
        ),
    ),
)

Fonts

The fonts that can be used in the PDF are based on the Font struct

// Represents a font.
type Font struct {
	CanUseForText bool
	CanUseForCode bool

	Category string
	Family   string

	FileRegular    string
	FileItalic     string
	FileBold       string
	FileBoldItalic string

	Type fontType
}

To be used for text, a font should have regular, italic, bold and bold-italic styles. Each of these has to be loaded separately.

To ease this process, variables have been generated for all the Google fonts that have these styles. For example:

var FontRoboto = Font{
	CanUseForCode:  false,
	CanUseForText:  true,
	Category:       "sans-serif",
	Family:         "Roboto",
	FileBold:       "700",
	FileBoldItalic: "700italic",
	FileItalic:     "italic",
	FileRegular:    "regular",
	Type:           fontTypeGoogle,
}

For codeblocks, if any other style is missing, the regular font is used in place.

var FontMajorMonoDisplay = Font{
	CanUseForCode:  true,
	CanUseForText:  false,
	Category:       "monospace",
	Family:         "Major Mono Display",
	FileBold:       "regular",
	FileBoldItalic: "regular",
	FileItalic:     "regular",
	FileRegular:    "regular",
	Type:           fontTypeGoogle,
}

When loading the fonts, they are downloaded on the fly using the fonts.

If you'd like to use a font outside of these, you should pass your own font struct which have been loaded into the PDF object you set in the Config. Be sure to set the FontType to FontTypeCustom so that we do not attempt to download it.

Contributing

Here's a list of things that I'd love help with:

  • More documentation
  • Testing
  • Finish the (currently buggy) implementation based on gopdf

License

MIT

Author

Stephen Afam-Osemene

goldmark-pdf's People

Contributors

stephenafamo avatar edouard-sn avatar

Recommend Projects

  • React photo React

    A declarative, efficient, and flexible JavaScript library for building user interfaces.

  • Vue.js photo Vue.js

    ๐Ÿ–– Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.

  • Typescript photo Typescript

    TypeScript is a superset of JavaScript that compiles to clean JavaScript output.

  • TensorFlow photo TensorFlow

    An Open Source Machine Learning Framework for Everyone

  • Django photo Django

    The Web framework for perfectionists with deadlines.

  • D3 photo D3

    Bring data to life with SVG, Canvas and HTML. ๐Ÿ“Š๐Ÿ“ˆ๐ŸŽ‰

Recommend Topics

  • javascript

    JavaScript (JS) is a lightweight interpreted programming language with first-class functions.

  • web

    Some thing interesting about web. New door for the world.

  • server

    A server is a program made to process requests and deliver data to clients.

  • Machine learning

    Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.

  • Game

    Some thing interesting about game, make everyone happy.

Recommend Org

  • Facebook photo Facebook

    We are working to build community through open source technology. NB: members must have two-factor auth.

  • Microsoft photo Microsoft

    Open source projects and samples from Microsoft.

  • Google photo Google

    Google โค๏ธ Open Source for everyone.

  • D3 photo D3

    Data-Driven Documents codes.