func newHandler()

in handler.go [42:94]
51 lines of code
14 McCabe index (conditional complexity)

func newHandler(config []byte) (*handler, error) {
	var parsed struct {
		Host     string `yaml:"host,omitempty"`
		CacheAge *int64 `yaml:"cache_max_age,omitempty"`
		Paths    map[string]struct {
			Repo    string `yaml:"repo,omitempty"`
			Display string `yaml:"display,omitempty"`
			VCS     string `yaml:"vcs,omitempty"`
		} `yaml:"paths,omitempty"`
	}
	if err := yaml.Unmarshal(config, &parsed); err != nil {
		return nil, err
	}
	h := &handler{host: parsed.Host}
	cacheAge := int64(86400) // 24 hours (in seconds)
	if parsed.CacheAge != nil {
		cacheAge = *parsed.CacheAge
		if cacheAge < 0 {
			return nil, errors.New("cache_max_age is negative")
		}
	}
	h.cacheControl = fmt.Sprintf("public, max-age=%d", cacheAge)
	for path, e := range parsed.Paths {
		pc := pathConfig{
			path:    strings.TrimSuffix(path, "/"),
			repo:    e.Repo,
			display: e.Display,
			vcs:     e.VCS,
		}
		switch {
		case e.Display != "":
			// Already filled in.
		case strings.HasPrefix(e.Repo, "https://github.com/"):
			pc.display = fmt.Sprintf("%v %v/tree/master{/dir} %v/blob/master{/dir}/{file}#L{line}", e.Repo, e.Repo, e.Repo)
		case strings.HasPrefix(e.Repo, "https://bitbucket.org"):
			pc.display = fmt.Sprintf("%v %v/src/default{/dir} %v/src/default{/dir}/{file}#{file}-{line}", e.Repo, e.Repo, e.Repo)
		}
		switch {
		case e.VCS != "":
			// Already filled in.
			if e.VCS != "bzr" && e.VCS != "git" && e.VCS != "hg" && e.VCS != "svn" {
				return nil, fmt.Errorf("configuration for %v: unknown VCS %s", path, e.VCS)
			}
		case strings.HasPrefix(e.Repo, "https://github.com/"):
			pc.vcs = "git"
		default:
			return nil, fmt.Errorf("configuration for %v: cannot infer VCS from %s", path, e.Repo)
		}
		h.paths = append(h.paths, pc)
	}
	sort.Sort(h.paths)
	return h, nil
}