Working through authentication

main.go

@@ -0,0 +1,75 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"strings"
+)
+
+var endpoint string = "http://127.0.0.1:8080"
+
+type Command struct {
+	Names       []string // aliases: short + long
+	Description string
+	Handler     func(args []string)
+}
+
+var commands = []Command{
+	{
+		Names:       []string{"login", "l"},
+		Description: "Log into the system",
+		Handler: func(args []string) {
+			fmt.Println("Executing login with args:", args)
+		},
+	},
+	{
+		Names:       []string{"auth", "authenticate"},
+		Description: "Authenticate with a token",
+		Handler:     authenticateMain,
+	},
+}
+
+func printMainUsage() {
+	fmt.Println("Usage:")
+	fmt.Println("  upc <command> [options]")
+	fmt.Println("\nAvailable commands:")
+
+	for _, cmd := range commands {
+		fmt.Printf("  %-20s %s\n", formatNames(cmd.Names), cmd.Description)
+	}
+}
+
+func formatNames(names []string) string {
+	return strings.Join(names, ", ")
+}
+
+func findCommand(name string) *Command {
+	for _, cmd := range commands {
+		for _, n := range cmd.Names {
+			if n == name {
+				return &cmd
+			}
+		}
+	}
+	return nil
+}
+
+func main() {
+
+	if len(os.Args) < 2 {
+		fmt.Println("Error: missing subcommand")
+		printMainUsage()
+		os.Exit(1)
+	}
+
+	subcommand := os.Args[1]
+
+	cmd := findCommand(subcommand)
+	if cmd == nil {
+		fmt.Println("Error: unknown command:", subcommand)
+		printMainUsage()
+		os.Exit(1)
+	}
+
+	cmd.Handler(os.Args[2:])
+}