Add cli

cli/cli.go

@@ -0,0 +1,31 @@
+package cli
+
+import (
+	"flag"
+	"fmt"
+	"os"
+)
+
+func Cli() {
+	Args()
+	Flags()
+}
+
+func Args() {
+	fmt.Println("Program: ", os.Args[0])
+	fmt.Println("Args:", os.Args[1:])
+}
+
+func Flags() {
+	// NOTE: The flags must come before positional args or else these will take their default values
+	bookTypePtr := flag.String("booktype", "manga", "The type of book. Valid values are \"manga\", \"comic\", \"fiction\", \"non-fiction\".")
+	pagesPtr := flag.Uint64("pages", 0, "Number of pages in the book.")
+	var coverPath string
+	flag.StringVar(&coverPath, "cover", "", "Path to the cover image of the book.")
+
+	flag.Parse()
+
+	fmt.Println("Book type:", *bookTypePtr)
+	fmt.Println("# of Pages:", *pagesPtr)
+	fmt.Println("Cover path:", coverPath)
+}

main.go

@@ -1,46 +1,50 @@
 package main
 
-// import "git.sangeeth.dev/gobyexample/runes"
+import (
-// import "git.sangeeth.dev/gobyexample/structs"
+	// "git.sangeeth.dev/gobyexample/runes"
-// import "git.sangeeth.dev/gobyexample/generics"
+	// "git.sangeeth.dev/gobyexample/structs"
-// import "git.sangeeth.dev/gobyexample/errors"
+	// "git.sangeeth.dev/gobyexample/generics"
-// import "git.sangeeth.dev/gobyexample/goroutines"
+	// "git.sangeeth.dev/gobyexample/errors"
-// import "git.sangeeth.dev/gobyexample/channels"
+	// "git.sangeeth.dev/gobyexample/goroutines"
-// import "git.sangeeth.dev/gobyexample/cselect"
+	// "git.sangeeth.dev/gobyexample/channels"
-// import "git.sangeeth.dev/gobyexample/timeouts"
+	// "git.sangeeth.dev/gobyexample/cselect"
-// import "git.sangeeth.dev/gobyexample/selectdefault"
+	// "git.sangeeth.dev/gobyexample/timeouts"
-// import "git.sangeeth.dev/gobyexample/closingchannels"
+	// "git.sangeeth.dev/gobyexample/selectdefault"
-// import "git.sangeeth.dev/gobyexample/timers"
+	// "git.sangeeth.dev/gobyexample/closingchannels"
-// import "git.sangeeth.dev/gobyexample/tickers"
+	// "git.sangeeth.dev/gobyexample/timers"
-// import "git.sangeeth.dev/gobyexample/workerpools"
+	// "git.sangeeth.dev/gobyexample/tickers"
-// import "git.sangeeth.dev/gobyexample/waitgroups"
+	// "git.sangeeth.dev/gobyexample/workerpools"
-// import "git.sangeeth.dev/gobyexample/ratelimiting"
+	// "git.sangeeth.dev/gobyexample/waitgroups"
-// import "git.sangeeth.dev/gobyexample/atomics"
+	// "git.sangeeth.dev/gobyexample/ratelimiting"
-// import "git.sangeeth.dev/gobyexample/mutex"
+	// "git.sangeeth.dev/gobyexample/atomics"
-// import "git.sangeeth.dev/gobyexample/statefulgoroutines"
+	// "git.sangeeth.dev/gobyexample/mutex"
-// import "git.sangeeth.dev/gobyexample/sorting"
+	// "git.sangeeth.dev/gobyexample/statefulgoroutines"
-// import "git.sangeeth.dev/gobyexample/panic"
+	// "git.sangeeth.dev/gobyexample/sorting"
-// import "git.sangeeth.dev/gobyexample/defers"
+	// "git.sangeeth.dev/gobyexample/panic"
-// import "git.sangeeth.dev/gobyexample/recovering"
+	// "git.sangeeth.dev/gobyexample/defers"
-// import "git.sangeeth.dev/gobyexample/stringfuncs"
+	// "git.sangeeth.dev/gobyexample/recovering"
-// import "git.sangeeth.dev/gobyexample/formatting"
+	// "git.sangeeth.dev/gobyexample/stringfuncs"
-// import "git.sangeeth.dev/gobyexample/templates"
+	// "git.sangeeth.dev/gobyexample/formatting"
-// import "git.sangeeth.dev/gobyexample/regex"
+	// "git.sangeeth.dev/gobyexample/templates"
-// import "git.sangeeth.dev/gobyexample/json"
+	// "git.sangeeth.dev/gobyexample/regex"
-// import "git.sangeeth.dev/gobyexample/xml"
+	// "git.sangeeth.dev/gobyexample/json"
-// import "git.sangeeth.dev/gobyexample/time"
+	// "git.sangeeth.dev/gobyexample/xml"
-// import "git.sangeeth.dev/gobyexample/rand"
+	// "git.sangeeth.dev/gobyexample/time"
-// import "git.sangeeth.dev/gobyexample/numberparsing"
+	// "git.sangeeth.dev/gobyexample/rand"
-// import "git.sangeeth.dev/gobyexample/url"
+	// "git.sangeeth.dev/gobyexample/numberparsing"
-// import "git.sangeeth.dev/gobyexample/sha"
+	// "git.sangeeth.dev/gobyexample/url"
-// import "git.sangeeth.dev/gobyexample/base64"
+	// "git.sangeeth.dev/gobyexample/sha"
-// import "git.sangeeth.dev/gobyexample/files"
+	// "git.sangeeth.dev/gobyexample/base64"
-// import "git.sangeeth.dev/gobyexample/linefilter"
+	// "git.sangeeth.dev/gobyexample/files"
-// import "git.sangeeth.dev/gobyexample/exit"
+	// "git.sangeeth.dev/gobyexample/linefilter"
-// import "git.sangeeth.dev/gobyexample/filepath"
+	// "git.sangeeth.dev/gobyexample/exit"
-// import "git.sangeeth.dev/gobyexample/dir"
+	// "git.sangeeth.dev/gobyexample/filepath"
-// import "git.sangeeth.dev/gobyexample/tmp"
+	// "git.sangeeth.dev/gobyexample/dir"
-import "git.sangeeth.dev/gobyexample/embed"
+	// "git.sangeeth.dev/gobyexample/tmp"
+	// "git.sangeeth.dev/gobyexample/embed"
+	// "git.sangeeth.dev/gobyexample/cli"
+	"git.sangeeth.dev/gobyexample/subcmd"
+)
 
 func main() {
 	// runes.Runes()
@@ -83,5 +87,7 @@ func main() {
 	// filepath.Filepath()
 	// dir.Dir()
 	// tmp.Tmp()
-	embed.Embed()
+	// embed.Embed()
+	// cli.Cli()
+	subcmd.SubCmd()
 }

subcmd/subcmd.go

@@ -0,0 +1,36 @@
+package subcmd
+
+import (
+	"flag"
+	"fmt"
+	"os"
+)
+
+func SubCmd() {
+	agentCmd := flag.NewFlagSet("agent", flag.ExitOnError)
+	agentLevel := agentCmd.Uint64("level", 1, "Level of the agent from 1-5")
+	agentName := agentCmd.String("name", "", "Name of the agent")
+
+	missionCmd := flag.NewFlagSet("mission", flag.ExitOnError)
+	missionName := missionCmd.String("codename", "classified", "Codename of the mission")
+	missionImpossible := missionCmd.Bool("impossible", false, "Is the mission impossible?")
+
+	if len(os.Args) < 2 {
+		fmt.Fprintln(os.Stderr, "A subcommand must be provided ('mission', 'agent')")
+		os.Exit(2)
+	}
+
+	switch os.Args[1] {
+	case "agent":
+		agentCmd.Parse(os.Args[2:])
+		fmt.Println("Agent level:", *agentLevel)
+		fmt.Println("Agent name:", *agentName)
+	case "mission":
+		missionCmd.Parse(os.Args[2:])
+		fmt.Println("Mission codename:", *missionName)
+		fmt.Println("Mission impossible?", *missionImpossible)
+	default:
+		fmt.Fprintln(os.Stderr, "Invalid subcommand. Only valid subcommands are 'mission' and 'agent'")
+		os.Exit(2)
+	}
+}