more functionality

main.go

@@ -1,23 +1,56 @@
 package main
 
 import (
+	"flag"
 	"fmt"
-	"log"
-	"time"
+	"os"
 
 	"git.yetaga.in/deltamualpha/libyear/pkg/gomod"
 	"git.yetaga.in/deltamualpha/libyear/pkg/libyear"
+	"git.yetaga.in/deltamualpha/libyear/pkg/logger"
 )
 
 func main() {
-	pairs, err := gomod.LoadAndComputePairs("go.mod")
+	quiet := flag.Bool("q", false, "quiet; reduces logging and outputs only out-of-date dependencies")
+	verbose := flag.Bool("v", false, "verbose; outputs diagnostic information")
+	indirect := flag.Bool("indirect", false, "include indirect dependencies in calculation (off by default)")
+
+	flag.Parse()
+
+	l := logger.NewLogger(*quiet, *verbose, os.Stdout, os.Stderr)
+
+	g := gomod.GoMod{
+		IncludeIndirect: *indirect,
+		ProxyLoader:     gomod.Queryer{Logger: l},
+		Logger:          l,
+	}
+
+	pairs, err := g.LoadAndComputePairs("go.mod")
 
 	if err != nil {
-		log.Fatal(err)
+		l.Error(err)
+		os.Exit(255)
 	}
 
 	for dep := range pairs {
-		fmt.Printf("%s: %d years (newest version: %s)\n", pairs[dep].Name, libyear.Calc(pairs[dep]).Truncate(time.Hour)/time.Hour/8760, pairs[dep].Latest.Version)
+		if pairs[dep].Current.Time == pairs[dep].Latest.Time {
+			if !*quiet {
+				fmt.Printf(
+					"%s: %s year(s) (up to date: %s)\n",
+					pairs[dep].Name,
+					libyear.DecimalYear(libyear.Calc(pairs[dep])),
+					pairs[dep].Latest.Version,
+				)
+			}
+		} else {
+			fmt.Printf(
+				"%s: %s year(s) (current: %s, newest: %s)\n",
+				pairs[dep].Name,
+				libyear.DecimalYear(libyear.Calc(pairs[dep])),
+				pairs[dep].Current.Version,
+				pairs[dep].Latest.Version,
+			)
+		}
 	}
-	fmt.Printf("total libyear count: %d years\n", libyear.Calc(pairs...).Truncate(time.Hour)/time.Hour/8760)
+	fmt.Printf("total libyear count: %s year(s)\n", libyear.DecimalYear(libyear.Calc(pairs...)))
 }

pkg/gomod/gomod.go

@@ -7,7 +7,27 @@ import (
 	"golang.org/x/mod/modfile"
 )
 
-func LoadAndComputePairs(filename string) ([]libyear.Pair, error) {
+type logger interface {
+	Logf(f string, s ...interface{})
+	Debugf(f string, s ...interface{})
+}
+
+type GoMod struct {
+	IncludeIndirect bool
+	ProxyLoader     Queryer
+	Logger          logger
+}
+
+func isReplaced(module string, replaces []*modfile.Replace) bool {
+	for i := range replaces {
+		if module == replaces[i].Old.Path {
+			return true
+		}
+	}
+	return false
+}
+
+func (g *GoMod) LoadAndComputePairs(filename string) ([]libyear.Pair, error) {
 	b, err := os.ReadFile(filename)
 	if err != nil {
 		return nil, err
@@ -16,14 +36,20 @@ func LoadAndComputePairs(filename string) ([]libyear.Pair, error) {
 	if err != nil {
 		return nil, err
 	}
-	q := Queryer{}
-
 	pairs := []libyear.Pair{}
 
 	for v := range f.Require {
 		if f.Require[v].Mod.Path != "" && f.Require[v].Mod.Version != "" {
-			latest := q.GetLatestVersion(f.Require[v].Mod.Path)
-			current := q.GetVersion(f.Require[v].Mod.Path, f.Require[v].Mod.Version)
+			if isReplaced(f.Require[v].Mod.Path, f.Replace) {
+				g.Logger.Logf("%s is replaced, skipping...\n", f.Require[v].Mod.Path)
+				continue
+			}
+			if !g.IncludeIndirect && f.Require[v].Indirect {
+				g.Logger.Logf("%s is indirect, skipping...\n", f.Require[v].Mod.Path)
+				continue
+			}
+			latest := g.ProxyLoader.GetLatestVersion(f.Require[v].Mod.Path)
+			current := g.ProxyLoader.GetVersion(f.Require[v].Mod.Path, f.Require[v].Mod.Version)
 			pairs = append(pairs, libyear.Pair{
 				Name:    f.Require[v].Mod.Path,
 				Current: current,

pkg/gomod/modproxy.go

@@ -4,7 +4,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"log"
 	"net/http"
 	"net/url"
 	"strconv"
@@ -18,6 +17,7 @@ type Queryer struct {
 	Root   string
 	Client http.Client
 	Cache  cache.Cache
+	Logger logger
 }
 
 type majorVersion struct {
@@ -59,17 +59,17 @@ func (q *Queryer) findLatestMajorVersion(module string) string {
 }
 
 func (q *Queryer) makeProxyRequest(mod string) libyear.Info {
-	log.Printf("makeProxyRequest for https://proxy.golang.org/%s", mod)
 	if q.Root == "" {
 		q.Root = "https://proxy.golang.org/"
 	}
+	q.Logger.Debugf("makeProxyRequest for %s/%s\n", q.Root, mod)
 
 	u, _ := url.Parse(q.Root)
 	u.Path = mod
 
 	i := q.Cache.Get(u.String())
 	if i.Version != "" {
-		log.Printf("cache hit for https://proxy.golang.org/%s", mod)
+		q.Logger.Debugf("cache hit for https://proxy.golang.org/%s\n", mod)
 		return i
 	}
 	req, err := http.NewRequest("GET", u.String(), nil)

pkg/libyear/libyear.go

@@ -1,6 +1,9 @@
 package libyear
 
-import "time"
+import (
+	"fmt"
+	"time"
+)
 
 type Info struct {
 	Version string    // version string
@@ -13,6 +16,8 @@ type Pair struct {
 	Current Info
 }
 
+// TODO: sum can only represent ~290 years before overflowing, but we don't actually need nanosecond precision!
+// Probably worth switching to hour-based summing here.
 func Calc(p ...Pair) time.Duration {
 	sum := time.Duration(0)
 	for i := range p {
@@ -20,3 +25,7 @@ func Calc(p ...Pair) time.Duration {
 	}
 	return sum
 }
+
+func DecimalYear(d time.Duration) string {
+	return fmt.Sprintf("%.2f", float64(d.Truncate(time.Hour)/time.Hour)/float64(8760))
+}

pkg/libyear/libyear_test.go

@@ -0,0 +1,23 @@
+package libyear
+
+import (
+	"testing"
+	"time"
+)
+
+func TestDecimalYear(t *testing.T) {
+	values := map[time.Duration]string{
+		time.Hour:           "0.00",
+		time.Hour * 8760:    "1.00",
+		time.Hour * 4380:    "0.50",
+		time.Hour * 12264:   "1.40",
+		time.Hour * 27520:   "3.14",
+		time.Hour * 1000000: "114.16",
+	}
+	for d, s := range values {
+		if r := DecimalYear(d); r != s {
+			t.Logf("Expected %s, got %s for %d", s, r, d)
+			t.Fail()
+		}
+	}
+}

pkg/logger/logger.go

@@ -0,0 +1,61 @@
+package logger
+
+import (
+	"fmt"
+	"io"
+	"os"
+)
+
+type Log struct {
+	quiet  bool
+	debug  bool
+	errOut io.Writer
+	stdOut io.Writer
+}
+
+func NewLogger(quiet, debug bool, stdOut, errOut io.Writer) *Log {
+	if stdOut == nil {
+		stdOut = os.Stdout
+	}
+	if errOut == nil {
+		errOut = os.Stderr
+	}
+	return &Log{
+		quiet:  quiet,
+		debug:  debug,
+		stdOut: stdOut,
+		errOut: errOut,
+	}
+}
+
+func (l *Log) Error(s ...interface{}) {
+	fmt.Fprint(l.errOut, s...)
+}
+
+func (l *Log) Errorf(f string, s ...interface{}) {
+	fmt.Fprint(l.errOut, s...)
+}
+
+func (l *Log) Log(s ...interface{}) {
+	if !l.quiet {
+		fmt.Fprint(l.stdOut, s...)
+	}
+}
+
+func (l *Log) Logf(f string, s ...interface{}) {
+	if !l.quiet {
+		fmt.Fprintf(l.stdOut, f, s...)
+	}
+}
+
+func (l *Log) Debug(s ...interface{}) {
+	if l.debug {
+		fmt.Fprint(l.errOut, s...)
+	}
+}
+
+func (l *Log) Debugf(f string, s ...interface{}) {
+	if l.debug {
+		fmt.Fprintf(l.errOut, f, s...)
+	}
+}

readme.md

@@ -0,0 +1,33 @@
+# libyear
+
+A **simple** measure of software dependency freshness. It is a **single number** telling you how up-to-date your dependencies are.
+
+[libyear.com](https://libyear.com/)
+
+## Usage
+
+`libyear` only supports projects using go modules. It ignores dependencies that are replaced in a go.mod file.
+
+`-q`: quiet mode; reduce logging and output only dependencies that are not at their latest version
+
+`-v`: verbose mode; output diagnostic information
+
+`-indirect`: include dependencies marked `// indirect` in `go.mod` in the calculation (excluded by default)
+
+## Example output
+
+When run in a directory that contains a `go.mod` file:
+
+```bash
+$ libyear
+github.com/pkg/errors: 1.03 year(s) (current: v0.8.1, newest: v0.9.1)
+github.com/stretchr/testify: 1.51 year(s) (current: v1.4.0, newest: v1.7.0)
+go.uber.org/atomic: 0.00 year(s) (up to date: v1.7.0)
+go.uber.org/multierr: 0.00 year(s) (up to date: v1.6.0)
+gopkg.in/yaml.v2: 2.01 year(s) (current: v2.2.2, newest: v2.4.0)
+total libyear count: 4.55 year(s)
+```
+
+## References
+
+J. Cox, E. Bouwers, M. van Eekelen and J. Visser, Measuring Dependency Freshness in Software Systems. In Proceedings of the 37th International Conference on Software Engineering (ICSE 2015), May 2015 <https://ericbouwers.github.io/papers/icse15.pdf>