feat: add cli to test unmarshal/marshl json

Author: t2y

.gitignore

@@ -7,6 +7,7 @@
 *.dll
 *.so
 *.dylib
+/bin/
 
 # Test binary, built with `go test -c`
 *.test

README.md

@@ -1,2 +1,21 @@
 # orderedmap
+
 An alternative ordered map in Go with de/serializing from/to JSON.
+
+## CLI for testing to deserialize JSON, then serialize with preserving the order
+
+```
+$ ./bin/cli -data '{"s":"test","i":3,"a":[{"f":3.14},{"b":true}]}'
+{
+  "s": "test",
+  "i": 3,
+  "a": [
+    {
+      "f": 3.14
+    },
+    {
+      "b": true
+    }
+  ]
+}
+```

cmd/cli/main.go

@@ -0,0 +1,34 @@
+package main
+
+import (
+	"encoding/json"
+	"flag"
+	"fmt"
+	"log/slog"
+	"os"
+
+	"github.com/kazamori/orderedmap"
+)
+
+var (
+	data = flag.String("data", "{}", "target json data")
+)
+
+func main() {
+	flag.Parse()
+
+	b := []byte(*data)
+	var m orderedmap.OrderedMap[string, any]
+	if err := json.Unmarshal(b, &m); err != nil {
+		slog.Error("failed to unmarshal as json", "err", err)
+		return
+	}
+
+	// pretty-print
+	b2, err := json.MarshalIndent(m, "", "  ")
+	if err != nil {
+		slog.Error("pretty-print", "value", m, "err", err)
+		return
+	}
+	fmt.Fprintln(os.Stderr, string(b2))
+}