Merge branch 'main' into issue_1550

app.go

@@ -113,6 +113,11 @@ type App struct {
 	UseShortOptionHandling bool
 	// Enable suggestions for commands and flags
 	Suggest bool
+	// Allows global flags set by libraries which use flag.XXXVar(...) directly
+	// to be parsed through this library
+	AllowExtFlags bool
+	// Treat all flags as normal arguments if true
+	SkipFlagParsing bool
 
 	didSetup bool
 
@@ -199,13 +204,15 @@ func (a *App) Setup() {
 		a.ErrWriter = os.Stderr
 	}
 
-	// add global flags added by other packages
-	flag.VisitAll(func(f *flag.Flag) {
-		// skip test flags
-		if !strings.HasPrefix(f.Name, ignoreFlagPrefix) {
-			a.Flags = append(a.Flags, &extFlag{f})
-		}
-	})
+	if a.AllowExtFlags {
+		// add global flags added by other packages
+		flag.VisitAll(func(f *flag.Flag) {
+			// skip test flags
+			if !strings.HasPrefix(f.Name, ignoreFlagPrefix) {
+				a.Flags = append(a.Flags, &extFlag{f})
+			}
+		})
+	}
 
 	var newCommands []*Command
 
@@ -280,6 +287,7 @@ func (a *App) newRootCommand() *Command {
 		HelpName:               a.HelpName,
 		CustomHelpTemplate:     a.CustomAppHelpTemplate,
 		categories:             a.categories,
+		SkipFlagParsing:        a.SkipFlagParsing,
 		isRoot:                 true,
 	}
 }

app_test.go

@@ -654,6 +654,7 @@ func TestApp_FlagsFromExtPackage(t *testing.T) {
 	}()
 
 	a := &App{
+		AllowExtFlags: true,
 		Flags: []Flag{
 			&StringFlag{
 				Name:     "carly",
@@ -677,6 +678,28 @@ func TestApp_FlagsFromExtPackage(t *testing.T) {
 	if someint != 10 {
 		t.Errorf("Expected 10 got %d for someint", someint)
 	}
+
+	a = &App{
+		Flags: []Flag{
+			&StringFlag{
+				Name:     "carly",
+				Aliases:  []string{"c"},
+				Required: false,
+			},
+			&BoolFlag{
+				Name:     "jimbob",
+				Aliases:  []string{"j"},
+				Required: false,
+				Value:    true,
+			},
+		},
+	}
+
+	// this should return an error since epflag shouldnt be registered
+	err = a.Run([]string{"foo", "-c", "cly", "--epflag", "10"})
+	if err == nil {
+		t.Error("Expected error")
+	}
 }
 
 func TestApp_Setup_defaultsReader(t *testing.T) {
@@ -790,6 +813,24 @@ func TestApp_CommandWithNoFlagBeforeTerminator(t *testing.T) {
 	expect(t, args.Get(2), "notAFlagAtAll")
 }
 
+func TestApp_SkipFlagParsing(t *testing.T) {
+	var args Args
+
+	app := &App{
+		SkipFlagParsing: true,
+		Action: func(c *Context) error {
+			args = c.Args()
+			return nil
+		},
+	}
+
+	_ = app.Run([]string{"", "--", "my-arg", "notAFlagAtAll"})
+
+	expect(t, args.Get(0), "--")
+	expect(t, args.Get(1), "my-arg")
+	expect(t, args.Get(2), "notAFlagAtAll")
+}
+
 func TestApp_VisibleCommands(t *testing.T) {
 	app := &App{
 		Commands: []*Command{

godoc-current.txt

@@ -324,6 +324,11 @@ type App struct {
 	UseShortOptionHandling bool
 	// Enable suggestions for commands and flags
 	Suggest bool
+	// Allows global flags set by libraries which use flag.XXXVar(...) directly
+	// to be parsed through this library
+	AllowExtFlags bool
+	// Treat all flags as normal arguments if true
+	SkipFlagParsing bool
 
 	// Has unexported fields.
 }

testdata/godoc-v2.x.txt

@@ -324,6 +324,11 @@ type App struct {
 	UseShortOptionHandling bool
 	// Enable suggestions for commands and flags
 	Suggest bool
+	// Allows global flags set by libraries which use flag.XXXVar(...) directly
+	// to be parsed through this library
+	AllowExtFlags bool
+	// Treat all flags as normal arguments if true
+	SkipFlagParsing bool
 
 	// Has unexported fields.
 }