d2/docs/examples/lib/1-d2lib/d2lib.go

package main

import (
	"context"
	"os"
	"path/filepath"

	"oss.terrastruct.com/d2/d2graph"
	"oss.terrastruct.com/d2/d2layouts/d2dagrelayout"
	"oss.terrastruct.com/d2/d2lib"
	"oss.terrastruct.com/d2/d2renderers/d2svg"
	"oss.terrastruct.com/d2/d2themes/d2themescatalog"
	"oss.terrastruct.com/d2/lib/log"
	"oss.terrastruct.com/d2/lib/textmeasure"
	"oss.terrastruct.com/util-go/go2"
)

// Remember to add if err != nil checks in production.
func main() {
	ruler, _ := textmeasure.NewRuler()
	layoutResolver := func(engine string) (d2graph.LayoutGraph, error) {
		return d2dagrelayout.DefaultLayout, nil
	}
	renderOpts := &d2svg.RenderOpts{
		Pad:     go2.Pointer(int64(5)),
		ThemeID: &d2themescatalog.GrapeSoda.ID,
	}
	compileOpts := &d2lib.CompileOptions{
		LayoutResolver: layoutResolver,
		Ruler:          ruler,
	}
	ctx := log.WithDefault(context.Background())
	diagram, _, _ := d2lib.Compile(ctx, "x -> y", compileOpts, renderOpts)
	out, _ := d2svg.Render(diagram, renderOpts)
	_ = os.WriteFile(filepath.Join("out.svg"), out, 0600)
}