feat: make github client optional

README.md

@@ -23,6 +23,10 @@ update-go-mod --deps-url "https://example.txt"
 
 # Don't do anythin
 update-go-mod --dry-run
+
+# Take a look
+# Require GitHub access token in ~/.netrc
+update-go-mod overlook
 ```
 
 ## Thanks

cmd/update-go-mod/main.go

@@ -2,7 +2,6 @@ package main
 
 import (
 	"context"
-	"log"
 	"strings"
 
 	"github.com/google/go-github/v53/github"
@@ -20,11 +19,9 @@ const (
 
 func main() {
 	// Prepare GitHub
+	var ghClient *github.Client
 	netrcData, err := netrc.ParseFile(netrcPath)
-	if err != nil {
-		log.Fatalln("Failed to read file netrc", err)
-	}
-
+	if err == nil {
 		var ghAccessToken string
 		for _, machine := range netrcData.Machines {
 			if machine.Name == netrcMachineGitHub {
@@ -32,17 +29,17 @@ func main() {
 				break
 			}
 		}
-	if ghAccessToken == "" {
-		log.Fatalln("Empty GitHub token in netrc")
-	}
 
+		if ghAccessToken != "" {
 			ghTokenSrc := oauth2.StaticTokenSource(
 				&oauth2.Token{
 					AccessToken: strings.TrimSpace(ghAccessToken),
 				},
 			)
 			ghHTTPClient := oauth2.NewClient(context.Background(), ghTokenSrc)
-	ghClient := github.NewClient(ghHTTPClient)
+			ghClient = github.NewClient(ghHTTPClient)
+		}
+	}
 
 	app := cli.NewApp(ghClient)
 	app.Run()

internal/cli/action_overlook.go

@@ -20,6 +20,11 @@ type GitHubRepoData struct {
 }
 
 func (a *action) Overlook(c *cli.Context) error {
+	// Optional
+	if a.ghClient == nil {
+		return nil
+	}
+
 	a.getFlags(c)
 
 	mapImportedModules, err := a.runGetImportedModules(c)