next : use new flags logic, tags as slice of Arg

.gitignore

@@ -1 +1,2 @@
 um
+go

next/next.go

@@ -1,8 +1,45 @@
 package next
 
-import "fmt"
+import (
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/brtholomy/um/go/flags"
+)
+
+type options struct {
+	descriptor flags.Arg
+	tags       []flags.Arg
+}
+
+func InitOpts() options {
+	return options{
+		flags.Arg{"", "midfix file descriptor"},
+		[]flags.Arg{},
+	}
+}
+
+func ParseArgs(args []string) options {
+	opts := InitOpts()
+	for i, arg := range args {
+		switch {
+		case i == 0 && !flags.HasDashPrefix(arg):
+			opts.descriptor.Val = args[0]
+		case i == 1 && !flags.HasDashPrefix(arg):
+			for _, t := range strings.Split(args[1], ",") {
+				opts.tags = append(opts.tags, flags.Arg{t, "tag"})
+			}
+		case i >= 2:
+			fmt.Println("um next : too many args")
+			os.Exit(1)
+		}
+	}
+	return opts
+}
 
 func Next(args []string) {
 	fmt.Println("next")
-	fmt.Println(args)
+	opts := ParseArgs(args)
+	fmt.Println(opts)
 }

tag/tag.go

@@ -46,5 +46,5 @@ func ParseArgs(args []string) options {
 func Tag(args []string) {
 	fmt.Printf("args: %#v\n", args)
 	opts := ParseArgs(args)
-	fmt.Printf("opts: %#v\n", opts)
+	fmt.Println(opts)
 }