feat: initial goget release — modern IPv6-first download utility

internal/cli/parser.go

@@ -0,0 +1,80 @@
+//go:build linux || freebsd
+// +build linux freebsd
+
+package cli
+
+import (
+	"flag"
+	"fmt"
+	"os"
+	"strings"
+)
+
+// Parser helps with argument parsing
+type Parser struct {
+	fs *flag.FlagSet
+}
+
+// NewParser creates new parser
+func NewParser(name string) *Parser {
+	return &Parser{
+		fs: flag.NewFlagSet(name, flag.ExitOnError),
+	}
+}
+
+// Parse parses arguments
+func (p *Parser) Parse(args []string) error {
+	return p.fs.Parse(args)
+}
+
+// GetBool returns a bool flag
+func (p *Parser) GetBool(name string) bool {
+	return p.fs.Lookup(name).Value.String() == "true"
+}
+
+// GetString returns a string flag
+func (p *Parser) GetString(name string) string {
+	return p.fs.Lookup(name).Value.String()
+}
+
+// ParseArgs parses command-line arguments
+func ParseArgs(args []string) (map[string]string, error) {
+	result := make(map[string]string)
+
+	for i := 0; i < len(args); i++ {
+		arg := args[i]
+		if strings.HasPrefix(arg, "--") {
+			key := strings.TrimPrefix(arg, "--")
+			if i+1 < len(args) && !strings.HasPrefix(args[i+1], "--") {
+				result[key] = args[i+1]
+				i++
+			} else {
+				result[key] = "true"
+			}
+		}
+	}
+
+	return result, nil
+}
+
+// ValidateRequiredFlags validates required flags
+func ValidateRequiredFlags(flags map[string]string, required []string) error {
+	var missing []string
+	for _, req := range required {
+		if _, exists := flags[req]; !exists {
+			missing = append(missing, req)
+		}
+	}
+
+	if len(missing) > 0 {
+		return fmt.Errorf("missing required flags: %s", strings.Join(missing, ", "))
+	}
+
+	return nil
+}
+
+// ExitWithError prints an error and exits the program
+func ExitWithError(err error) {
+	fmt.Fprintf(os.Stderr, "Error: %v\n", err)
+	os.Exit(1)
+}