Implemented more unified way for usage, description and options.

cmd/test/main.go

@@ -1,40 +1,54 @@
 package main
 
 import (
-	"github.com/omnipunk/cli"
+	"github.com/omnipunk/cli/mtool"
 	"strconv"
 	"fmt"
+	"os"
 )
 
 var (
-	tools = mtool.Tools{
-		"echo": mtool.Tool{
-			func(flags *mtool.Flags) {
+	root = mtool.T("test").Subs(
+		mtool.T("echo").Func(func(flags *mtool.Flags) {
 				var b bool
 				flags.BoolVar(&b, "b", false, "the check flag")
-				flags.Parse()
-
-				args := flags.Args()
-
+				args := flags.Parse()
 				fmt.Println(args)
-			},
+			}).Desc(
 				"print string to standard output string",
+			).Usage(
 				"[str1 str2 ... strN]",
-		},
-		"sum": mtool.Tool{
-			func(flags *mtool.Flags) {
+			),
+		mtool.T("sum").Func(func(flags *mtool.Flags) {
 				flags.Parse()
 				args := flags.Args()
 				one, _ := strconv.Atoi(args[1])
 				two, _ := strconv.Atoi(args[2])
 				fmt.Println(one + two)
-			},
+			}).Desc(
 				"add one value to another",
+			).Usage(
 				"<int1> <int2>",
-		},
-	}
+			),
+		mtool.T("sub").Subs(
+			mtool.T("first").Func(func(flags *mtool.Flags) {
+					fmt.Println("called the first", flags.Parse())
+				}).Desc(
+					"description",
+				).Usage(
+					"[nothing here]",
+				),
+			mtool.T("second").Func(func(flags *mtool.Flags){
+					fmt.Println("called the second", flags.Parse())
+				}).Desc(
+					"description",
+				).Usage(
+					"[nothing here]",
+				),
+			),
+	)
 )
 
 func main() {
-	mtool.Main("test", tools)
+	root.Run(os.Args[1:])
 }

main.go

@@ -1,136 +0,0 @@
-package mtool
-
-import(
-	"fmt"
-	"os"
-	path "path/filepath"
-	"flag"
-	"sort"
-)
-
-type Flags struct {
-	*flag.FlagSet
-	progName string
-	utilName string
-	args []string
-	parsedArgs []string
-}
-
-type Handler func(*Flags)
-
-type Tool struct {
-	Handler Handler
-	Desc, Usage string
-}
-
-type Tools map[string] Tool
-
-func (flags *Flags) Parse() []string {
-	flags.FlagSet.Parse(flags.args)
-	flags.parsedArgs = flags.FlagSet.Args()
-	return flags.parsedArgs
-}
-
-func (flags *Flags) AllArgs() []string {
-	return flags.args
-}
-
-func (flags *Flags) Args() []string {
-	return flags.parsedArgs
-}
-
-func (flags *Flags) ProgName() string {
-	return flags.progName
-}
-
-func (flags *Flags) UtilName() string {
-	return flags.utilName
-}
-
-func Main(name string, m Tools) {
-	var(
-		utilName string
-		args []string
-	)
-	
-	arg0 := os.Args[0]
-	binBase := path.Base(arg0) ;
-	binBase = binBase[:len(binBase)-len(path.Ext(binBase))]
-	if binBase != name {
-		utilName = binBase
-		args = os.Args
-	} else {
-		if len(os.Args)<2  {
-			keys := make([]string, len(m))
-			i := 0
-			for k, _ := range m {
-				keys[i] = k
-				i++
-			}
-			sort.Strings(keys)
-			
-			for _, k := range keys {
-				tool := m[k]
-				fmt.Printf("%s: %s\n", k, tool.Desc)
-			}
-			
-			os.Exit(0)
-		}
-		utilName = os.Args[1]
-		args = os.Args[1:]
-	}
-
-	if _, ok := m[utilName] ; !ok {
-		fmt.Printf("%s: No such uitl as '%s'.\n", arg0, utilName )
-		os.Exit(1)
-	}
-
-	util := m[utilName]
-	
-	flagSet := flag.NewFlagSet(utilName, flag.ExitOnError)
-	flags := &Flags{
-		FlagSet : flagSet,
-	}
-	flags.Usage = func() {
-		out := flags.Output()
-		n := 0
-		flags.VisitAll(func(f *flag.Flag){
-			n++
-		})
-		
-		hasOptions := n != 0
-		
-		fmt.Fprintf(
-			out,
-			"Usage of %s:\n\t%s",
-			utilName, utilName,
-		)
-		if hasOptions {
-			fmt.Fprintf(out, " [options]")
-		}
-		
-		if util.Usage != "" {
-			fmt.Fprintf(
-				out,
-				" %s",
-				util.Usage,
-			)
-		}
-		
-		fmt.Fprintln(out, "")
-		
-		if hasOptions {
-			fmt.Fprintln(out, "Options:")
-			flags.PrintDefaults()
-		}
-		
-		os.Exit(1)
-	}
-	
-	flags.progName = name
-	flags.utilName = utilName
-	flags.args = args[1:]
-	
-	util.Handler(flags)
-}
-

mtool/main.go

@@ -0,0 +1,217 @@
+package mtool
+
+// The package implements fast way
+// to make multitool CLI applications.
+
+import (
+	"fmt"
+	"os"
+	//path "path/filepath"
+	"flag"
+	"sort"
+)
+
+
+type Flags struct {
+	*flag.FlagSet
+	tool *Tool
+	args []string
+	parsedArgs []string
+}
+
+type Handler interface {
+	Handle(*Flags)
+}
+
+type HandlerFunc func(*Flags)
+func (fn HandlerFunc) Handle(flags *Flags) {
+	fn(flags)
+}
+
+type Tool struct {
+	name string
+	handler Handler
+	desc, usage string
+	subs ToolMap
+	parent *Tool
+}
+
+// Returns new empty tool with specified name.
+func T(name string) *Tool {
+	ret := &Tool{}
+	ret.name = name
+	return ret
+}
+
+func (t *Tool) Handler(h Handler) *Tool {
+	t.handler = h
+	return t
+}
+
+func (t *Tool) Func(fn HandlerFunc) *Tool {
+	t.handler = fn
+	return t
+}
+
+func (t *Tool) Desc(d string) *Tool {
+	t.desc = d
+	return t
+}
+
+func (t *Tool) Usage(u string) *Tool {
+	t.usage = u
+	return t
+}
+
+func (t *Tool) Subs(tools ...*Tool) *Tool {
+	if t.subs == nil {
+		t.subs = ToolMap{}
+	}
+	for _, tool := range tools {
+		tool.parent = t
+		t.subs[tool.name] = tool
+	}
+	return t
+}
+
+func (t *Tool) Name() string {
+	return t.name
+}
+
+func (t *Tool) FullName() string {
+	ret := ""
+	for t != nil {
+		ret = t.name + func() string {
+			if ret != "" {
+				return " "
+			}
+			return ""
+		}() + ret
+		t = t.parent
+	}
+	return ret
+}
+
+func (t *Tool) ProgName() string {
+	for t.parent != nil {
+		t = t.parent
+	}
+	return t.name
+}
+
+func (t *Tool) Run(args []string) {
+	var(
+		usageTool *Tool
+	)
+	// Should implement the shit later
+	//binBase := path.Base(arg0) ;
+	//binBase = binBase[:len(binBase)-len(path.Ext(binBase))]
+
+	flagSet := flag.NewFlagSet(t.FullName(), flag.ExitOnError)
+	flags := &Flags{
+		FlagSet : flagSet,
+	}
+	out := flags.Output()
+	flags.Usage = func() {
+		n := 0
+		// We can visit the flags since the
+		// function will be called after 
+		// parsing.
+		flags.VisitAll(func(f *flag.Flag){
+			n++
+		})
+		
+		hasOptions := n != 0
+		
+		fmt.Fprintf(
+			out, "Usage:\n  %s",
+			usageTool.FullName(),
+		)
+		if hasOptions {
+			fmt.Fprintf(out, " [options]")
+		}
+		
+		if usageTool.usage != "" {
+			fmt.Fprintf(
+				out,
+				" %s",
+				usageTool.usage,
+			)
+		}
+
+		fmt.Fprintln(out, "")
+		
+		if hasOptions {
+			fmt.Fprintln(out, "\nOptions:")
+			flags.PrintDefaults()
+		}
+		
+		os.Exit(1)
+	}
+	
+	flags.args = args
+
+	// If the tool has its own handler run it.
+	if t.handler != nil {
+		usageTool = t
+		t.handler.Handle(flags)
+		return
+	}
+
+	// Print available sub commands if
+	// got no arguments.
+	if len(args) == 0 {
+		keys := make([]string, len(t.subs))
+		i := 0
+		for k, _ := range t.subs {
+			keys[i] = k
+			i++
+		}
+		sort.Strings(keys)
+		
+		fmt.Fprintf(out, "Usage:\n"+
+			"  %s <command> [options] [arguments]\n\n" +
+			"Commands:\n", t.FullName())
+		for i, k := range keys {
+			tool := t.subs[k]
+			fmt.Fprintf(out, "  %s\t%s\n", k, tool.desc)
+			if i != len(keys) - 1 {
+				fmt.Fprintln(out, "")
+			}
+		}
+		
+		os.Exit(1)
+	}
+	toolName := args[0]
+	args = args[1:]
+	
+	if _, ok := t.subs[toolName] ; !ok {
+		fmt.Printf("%s: No such util %q'\n", t.ProgName(), toolName)
+		os.Exit(1)
+	}
+
+	sub := t.subs[toolName]
+	usageTool = sub
+	sub.Run(args)
+}
+
+type ToolMap map[string] *Tool
+
+func (flags *Flags) Parse() []string {
+	flags.FlagSet.Parse(flags.args)
+	flags.parsedArgs = flags.FlagSet.Args()
+	return flags.parsedArgs
+}
+
+func (flags *Flags) AllArgs() []string {
+	return flags.args
+}
+
+func (flags *Flags) Args() []string {
+	return flags.parsedArgs
+}
+
+func (flags *Flags) Tool() *Tool {
+	return flags.tool
+}
+

taskfile.yml

@@ -0,0 +1,7 @@
+version: '3'
+
+tasks:
+  btest:
+    cmds:
+      - go build ./cmd/test
+