Add default GoDocURL value

goreadme.go

@@ -142,7 +142,7 @@ type Config struct {
 	// 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"`
-	// GoDocURL is the Go Doc URL used in the GoDoc Badge.
+	// GoDocURL is the Go Doc URL used in the GoDoc Badge. Default: https://pkg.go.dev.
 	GoDocURL string `json:"godoc_url"`
 	// Use the standard library comment parser introduced in Go 1.19 to generate the markdown output.
 	StdMarkdown bool `json:"std_markdown"`
@@ -270,6 +270,10 @@ func (r *GoReadme) get(ctx context.Context, name string) (*pkg, error) {
 		p.ImportPath = override
 	}
 
+	if override := r.config.GoDocURL; override == "" {
+		r.config.GoDocURL = "https://pkg.go.dev"
+	}
+
 	pkg := &pkg{
 		Package: p,
 	}

testdata/pkg4_badges/README.md

@@ -3,7 +3,7 @@
 [![Build Status](https://travis-ci.org/./testdata/pkg4_badges.svg?branch=master)](https://travis-ci.org/./testdata/pkg4_badges)
 [![codecov](https://codecov.io/gh/./testdata/pkg4_badges/branch/master/graph/badge.svg)](https://codecov.io/gh/./testdata/pkg4_badges)
 [![golangci](https://golangci.com/badges/./testdata/pkg4_badges.svg)](https://golangci.com/r/./testdata/pkg4_badges)
-[![GoDoc](https://img.shields.io/badge/pkg.go.dev-doc-blue)](http://pkg.go.dev/./testdata/pkg4_badges)
+[![GoDoc](https://pkg.go.dev/badge/pkgsite/pkg.svg)](https://pkg.go.dev/./testdata/pkg4_badges)
 [![Go Report Card](https://goreportcard.com/badge/./testdata/pkg4_badges)](https://goreportcard.com/report/./testdata/pkg4_badges)
 
 Package pkg4 tests badges.