json2go @ 917fe252d3d54a71e05b02de24f4d4d361cb21ef

M cmd/json2go/main.go

@@ -1,9 +1,64 @@
 package main
 
-// todo: piped / sedin
-// todo: passed as argument
-// todo: read from file
-// todo: set name of the type
+import (
+	"flag"
+	"fmt"
+	"io"
+	"os"
+
+	"olexsmir.xyz/json2go"
+)
 
 func main() {
+	typeName := flag.String("type", "AutoGenerated", "a name for generated type")
+	showHelp := flag.Bool("help", false, "show help")
+	flag.Parse()
+
+	if *showHelp {
+		printHelp()
+		os.Exit(0)
+	}
+
+	// get input
+	args := flag.Args()
+
+	stat, err := os.Stdin.Stat()
+	if err != nil {
+		panic(err)
+	}
+
+	isPiped := (stat.Mode() & os.ModeCharDevice) == 0
+
+	var input string
+	switch {
+	case len(args) > 0:
+		input = args[0]
+	case isPiped:
+		data, rerr := io.ReadAll(os.Stdin)
+		if rerr != nil {
+			panic(rerr)
+		}
+		input = string(data)
+	default:
+		printHelp()
+		os.Exit(1)
+	}
+
+	transformer := json2go.NewTransformer()
+	type_, err := transformer.Transform(*typeName, input)
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Println(type_)
+}
+
+func printHelp() {
+	fmt.Println(`
+Convert json to Go type annotations.
+
+Usage:
+	echo '{"json": "here"}' | json2go
+	echo '{"json": "here"}' | json2go -type=MyTypeName
+	json2go -type=MyTypeName '{"json": "here"}'`[1:])
 }