func parsePullURL(u *url.URL) (org, repo string, pr int, err error) {
	var prStr string
	vals := u.Query()
	if org = vals.Get("org"); org == "" {
		return "", "", 0, fmt.Errorf("no value provided for org")
	}
	if repo = vals.Get("repo"); repo == "" {
		return "", "", 0, fmt.Errorf("no value provided for repo")
	}
	prStr = vals.Get("pr")
	pr, err = strconv.Atoi(prStr)
	if err != nil {
		return "", "", 0, fmt.Errorf("invalid PR number %q: %v", prStr, err)
	}
	return org, repo, pr, nil
}
func parsePullURL(u *url.URL) (org, repo string, pr int, err error) {
	var prStr string
	vals := u.Query()
	if org = vals.Get("org"); org == "" {
		return "", "", 0, fmt.Errorf("no value provided for org")
	}
	if repo = vals.Get("repo"); repo == "" {
		return "", "", 0, fmt.Errorf("no value provided for repo")
	}
	prStr = vals.Get("pr")
	pr, err = strconv.Atoi(prStr)
	if err != nil {
		return "", "", 0, fmt.Errorf("invalid PR number %q: %v", prStr, err)
	}
	return org, repo, pr, nil
}
// parsePullURL parses PR history URLs. Expects this format:
// .../pr-history?org=<org>&repo=<repo>&pr=<pr number>