func main()

in cmd/generate/main.go [32:94]
48 lines of code
11 McCabe index (conditional complexity)

func main() {
	os.Remove(genFile)

	out, err := os.OpenFile(genFile, os.O_RDWR|os.O_CREATE, 0644)
	if err != nil {
		panic(err)
	}

	defer out.Close()

	f, err := os.Open(versionFile)
	if err != nil {
		panic(err)
	}
	defer f.Close()

	v, err := io.ReadAll(f)
	if err != nil {
		panic(err)
	}

	client := http.Client{
		Timeout: timeout,
	}

	rsp, err := client.Get(fmt.Sprintf("https://cdn.rawgit.com/jshttp/mime-db/%s/db.json", versionRegexp.FindString(string(v))))
	if err != nil {
		panic(err)
	}

	if rsp.StatusCode != http.StatusOK {
		panic(rsp)
	}

	var result Data

	if err := json.NewDecoder(rsp.Body).Decode(&result); err != nil {
		panic(err)
	}

	fmt.Fprintln(out, "package mimedb")
	fmt.Fprintln(out, "")
	fmt.Fprintln(out, "var (")
	fmt.Fprintln(out, "	MimeTypeToExts = map[string][]string{")

	for mimeType, entry := range result {
		if len(entry.Extensions) > 0 {
			fmt.Fprintf(out, "		%q: %#v,\n", mimeType, entry.Extensions)
		}
	}

	fmt.Fprintln(out, "	}")
	fmt.Fprintln(out, ")")

	if err := out.Close(); err != nil {
		panic(err)
	}

	// run `go fmt` on the output
	if err := exec.Command("go", "fmt").Run(); err != nil {
		panic(err)
	}
}