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validate.go
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validate.go
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package main
import (
"errors"
"fmt"
"os"
"strings"
)
const GoFileExtension = ".go"
func validate(source, destination, pkg *string) error {
if err := validateSource(source); err != nil {
return err
}
if err := validateFileName(destination); err != nil {
return err
}
if pkg == nil {
return errors.New("package cannot be nil")
}
*pkg = strings.TrimSpace(*pkg)
if len(*pkg) == 0 {
return errors.New("pkg must be set")
}
return nil
}
func validateSource(source *string) error {
if err := validateFileName(source); err != nil {
return fmt.Errorf("source is not valid: %w", err)
}
if _, err := os.Open(*source); err != nil {
return fmt.Errorf("could not open the file: %w", err)
}
return nil
}
func validateFileName(fileName *string) error {
if fileName == nil {
return errors.New("variable is nil")
}
*fileName = strings.TrimSpace(*fileName)
if len(*fileName) == 0 {
return errors.New("file name cannot be empty")
}
if !strings.HasSuffix(*fileName, GoFileExtension) {
return errors.New("file must be go file")
}
return nil
}