func main()

in tools/relnotes/relnotes.go [38:155]
100 lines of code
26 McCabe index (conditional complexity)

func main() {
	flag.Parse()

	var existingMD []byte
	if *exclFile != "" {
		var err error
		existingMD, err = ioutil.ReadFile(*exclFile)
		if err != nil {
			log.Fatal(err)
		}
	}

	corpus, err := godata.Get(context.Background())
	if err != nil {
		log.Fatal(err)
	}

	var dirs []string
	for _, dir := range strings.FieldsFunc(*filterDirs, func(r rune) bool {
		return unicode.IsSpace(r) || r == ','
	}) {
		dirs = append(dirs, filepath.ToSlash(dir))
	}

	ger := corpus.Gerrit()

	// Find the cutoff time for changes to include.
	start := time.Date(2020, time.August, 1, 00, 00, 00, 0, time.UTC)
	ger.ForeachProjectUnsorted(func(gp *maintner.GerritProject) error {
		if gp.Server() != "go.googlesource.com" || gp.Project() != *project {
			return nil
		}
		gp.ForeachCLUnsorted(func(cl *maintner.GerritCL) error {
			if cl.Status != "merged" {
				return nil
			}
			if *sinceCL >= 0 {
				if int(cl.Number) == *sinceCL {
					start = cl.Commit.CommitTime
				}
			} else if cl.Branch() == "release" && cl.Commit.CommitTime.After(start) {
				// Try to figure out when the last release was
				fmt.Println(cl.Commit.CommitTime)
				start = cl.Commit.CommitTime
			}
			return nil
		})
		return nil
	})

	var changes []*generic.Changelist
	authors := map[*maintner.GitPerson]bool{}
	ger.ForeachProjectUnsorted(func(gp *maintner.GerritProject) error {
		if gp.Server() != "go.googlesource.com" || gp.Project() != *project {
			return nil
		}
		gp.ForeachCLUnsorted(func(cl *maintner.GerritCL) error {
			// Only include 'master'
			if cl.Branch() != "master" {
				return nil
			}
			if cl.Status != "merged" {
				return nil
			}
			if cl.Commit.CommitTime.Before(start) {
				// Was in a previous release; not for this one.
				return nil
			}

			if bytes.Contains(existingMD, []byte(fmt.Sprintf("CL %d ", cl.Number))) {
				return nil
			}

			// Check that at least one file is in a relevant directory before
			// adding the CL.
			if len(dirs) > 0 {
				var found bool
				for _, file := range cl.Commit.Files {
					for _, dir := range dirs {
						if strings.Contains(file.File, dir) {
							found = true
							break
						}
					}
				}
				if !found {
					return nil
				}
			}
			changes = append(changes, golang.GerritToGenericCL(cl))
			authors[cl.Owner()] = true
			return nil
		})
		return nil
	})

	sort.Slice(changes, func(i, j int) bool {
		return changes[i].Number < changes[j].Number
	})

	if *mdMode {
		fmt.Printf("## TODO: version - ")
		now := time.Now()
		fmt.Printf("%s\n\n", now.Format("2 Jan, 2006"))
		fmt.Printf("### Changes\n\n")
		mdPrintChanges(changes, true)

		fmt.Printf("### Issues\n\n")
		mdPrintIssues(changes, *milestone)

		fmt.Printf("\n### Thanks\n\n")
		mdPrintContributors(authors)
	} else {
		for _, change := range changes {
			fmt.Printf("  %s\n", change.Subject)
		}
	}
}