Add the message on how to update an updatable binary.

cmd/check.go

@@ -3,6 +3,7 @@ package cmd
 import (
 	"fmt"
 	"os"
+	"strings"
 
 	"github.com/nao1215/gup/internal/goutil"
 	"github.com/nao1215/gup/internal/print"
@@ -44,6 +45,7 @@ func check(cmd *cobra.Command, args []string) int {
 func doCheck(pkgs []goutil.Package) int {
 	result := 0
 	countFmt := "[%" + pkgDigit(pkgs) + "d/%" + pkgDigit(pkgs) + "d]"
+	needUpdatePkgs := []goutil.Package{}
 
 	print.Info("check all binary under $GOPATH/bin or $GOBIN")
 	for i, v := range pkgs {
@@ -65,6 +67,27 @@ func doCheck(pkgs []goutil.Package) int {
 
 		print.Info(fmt.Sprintf(countFmt+" check success: %s (%s)",
 			i+1, len(pkgs), v.ModulePath, v.CurrentToLatestStr()))
+
+		if !goutil.IsAlreadyUpToDate(*v.Version) {
+			needUpdatePkgs = append(needUpdatePkgs, v)
+		}
 	}
+
+	printUpdatablePkgInfo(needUpdatePkgs)
 	return result
 }
+
+func printUpdatablePkgInfo(pkgs []goutil.Package) {
+	if len(pkgs) == 0 {
+		return
+	}
+
+	var p string
+	for _, v := range pkgs {
+		p += v.Name + " "
+	}
+	fmt.Println("")
+	print.Info("If you want to update binaries, the following command.\n" +
+		strings.Repeat(" ", 11) +
+		"$ gup update " + p)
+}

internal/goutil/goutil.go

@@ -64,12 +64,17 @@ func (p *Package) SetLatestVer() {
 
 // CurrentToLatestStr returns string about the current version and the latest version
 func (p *Package) CurrentToLatestStr() string {
-	if p.Version.Current == p.Version.Latest {
+	if IsAlreadyUpToDate(*p.Version) {
 		return "Already up-to-date: " + color.GreenString(p.Version.Latest)
 	}
 	return color.GreenString(p.Version.Current) + " to " + color.GreenString(p.Version.Latest)
 }
 
+// IsAlreadyUpToDate return whether binary is already up to date or not.
+func IsAlreadyUpToDate(ver Version) bool {
+	return ver.Current == ver.Latest
+}
+
 // NewGoPaths return GoPaths instance.
 func NewGoPaths() *GoPaths {
 	return &GoPaths{