Upgrade dependencies

go.mod

@@ -3,8 +3,8 @@ module github.com/jotaen/klog
 go 1.23
 
 require (
-	cloud.google.com/go v0.115.1
-	github.com/alecthomas/kong v0.9.0
+	cloud.google.com/go v0.116.0
+	github.com/alecthomas/kong v1.4.0
 	github.com/jotaen/genie v0.0.1
 	github.com/jotaen/kong-completion v0.0.6
 	github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51

go.sum

@@ -1,9 +1,9 @@
-cloud.google.com/go v0.115.1 h1:Jo0SM9cQnSkYfp44+v+NQXHpcHqlnRJk2qxh6yvxxxQ=
-cloud.google.com/go v0.115.1/go.mod h1:DuujITeaufu3gL68/lOFIirVNJwQeyf5UXyi+Wbgknc=
-github.com/alecthomas/assert/v2 v2.6.0 h1:o3WJwILtexrEUk3cUVal3oiQY2tfgr/FHWiz/v2n4FU=
-github.com/alecthomas/assert/v2 v2.6.0/go.mod h1:Bze95FyfUr7x34QZrjL+XP+0qgp/zg8yS+TtBj1WA3k=
-github.com/alecthomas/kong v0.9.0 h1:G5diXxc85KvoV2f0ZRVuMsi45IrBgx9zDNGNj165aPA=
-github.com/alecthomas/kong v0.9.0/go.mod h1:Y47y5gKfHp1hDc7CH7OeXgLIpp+Q2m1Ni0L5s3bI8Os=
+cloud.google.com/go v0.116.0 h1:B3fRrSDkLRt5qSHWe40ERJvhvnQwdZiHu0bJOpldweE=
+cloud.google.com/go v0.116.0/go.mod h1:cEPSRWPzZEswwdr9BxE6ChEn01dWlTaF05LiC2Xs70U=
+github.com/alecthomas/assert/v2 v2.11.0 h1:2Q9r3ki8+JYXvGsDyBXwH3LcJ+WK5D0gc5E8vS6K3D0=
+github.com/alecthomas/assert/v2 v2.11.0/go.mod h1:Bze95FyfUr7x34QZrjL+XP+0qgp/zg8yS+TtBj1WA3k=
+github.com/alecthomas/kong v1.4.0 h1:UL7tzGMnnY0YRMMvJyITIRX1EpO6RbBRZDNcCevy3HA=
+github.com/alecthomas/kong v1.4.0/go.mod h1:p2vqieVMeTAnaC83txKtXe8FLke2X07aruPWXyMPQrU=
 github.com/alecthomas/repr v0.4.0 h1:GhI2A8MACjfegCPVq9f1FLvIBS+DrQ2KQBFZP1iFzXc=
 github.com/alecthomas/repr v0.4.0/go.mod h1:Fr0507jx4eOXV7AlPV6AVZLYrLIuIeSOWtW57eE/O/4=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=

klog/app/error.go

@@ -43,6 +43,8 @@ type Error interface {
 	// Error returns the error message.
 	Error() string
 
+	Is(error) bool
+
 	// Details returns additional details, such as a hint how to solve the problem.
 	Details() string
 
@@ -72,6 +74,11 @@ func (e AppError) Error() string {
 	return e.message
 }
 
+func (e AppError) Is(err error) bool {
+	_, ok := err.(AppError)
+	return ok
+}
+
 func (e AppError) Details() string {
 	return e.details
 }
@@ -101,6 +108,11 @@ func (pe parserErrors) Error() string {
 	return fmt.Sprintf("%d parsing error(s)", len(pe.errors))
 }
 
+func (e parserErrors) Is(err error) bool {
+	_, ok := err.(parserErrors)
+	return ok
+}
+
 func (pe parserErrors) Details() string {
 	return fmt.Sprintf("%d parsing error(s)", len(pe.errors))
 }

klog/app/main/cli.go

@@ -67,6 +67,8 @@ func Run(homeDir app.File, meta app.Meta, config app.Config, args []string) (int
 		}),
 	)
 	if nErr != nil {
+		// This code branch is not expected to be invoked in practice. If it were to
+		// happen, that most likely indicates a bug in the app setup.
 		return app.GENERAL_ERROR.ToInt(), errors.New("Internal error: " + nErr.Error())
 	}
 
@@ -95,15 +97,19 @@ func Run(homeDir app.File, meta app.Meta, config app.Config, args []string) (int
 	kongCtx.BindTo(ctx, (*app.Context)(nil))
 
 	rErr := kongCtx.Run()
-	if rErr != nil {
-		switch e := rErr.(type) {
-		case app.ParserErrors:
-			return e.Code().ToInt(), util.PrettifyParsingError(e, styler)
-		case app.Error:
-			return e.Code().ToInt(), util.PrettifyAppError(e, config.IsDebug.Value())
-		default:
-			return app.GENERAL_ERROR.ToInt(), errors.New("Error: " + e.Error())
-		}
+	parserErrors := app.NewParserErrors(nil)
+	appError := app.NewError("", "", nil)
+
+	switch {
+	case rErr == nil:
+		return 0, nil
+	case errors.As(rErr, &parserErrors):
+		return parserErrors.Code().ToInt(), util.PrettifyParsingError(parserErrors, styler)
+	case errors.As(rErr, &appError):
+		return appError.Code().ToInt(), util.PrettifyAppError(appError, config.IsDebug.Value())
+	default:
+		// This is just a fallback clause; this code branch is not expected to be
+		// invoked in practice.
+		return app.GENERAL_ERROR.ToInt(), errors.New("Error: " + rErr.Error())
 	}
-	return 0, nil
 }