Add GVariant with the same (very low) hope to trully make it work as DBus

src/lib.rs

@@ -15,9 +15,9 @@ pub struct Opt {
     #[clap(value_enum, ignore_case = true)]
     pub output: Output,
 
-    #[clap(long, short = 'F')]
+    #[clap(long, short = 'F', required_if_eq_any(&[("input", "d-bus"), ("input", "g-variant")]))]
     pub format_in: Option<String>,
-    #[clap(long, short = 'f', required_if_eq_any(&[("output", "d-bus")]))]
+    #[clap(long, short = 'f', required_if_eq_any(&[("output", "d-bus"), ("output", "g-variant")]))]
     pub format_out: Option<String>,
 
     /// For data format compatible, a default pretty format is output instead of a minified one
@@ -34,6 +34,7 @@ pub enum Input {
     //Bson,
     //Cbor,
     DBus,
+    GVariant,
     Json,
     Json5,
     //SExpression,
@@ -49,8 +50,8 @@ pub enum Input {
 pub enum Output {
     //Bson,
     //Cbor,
-    //#[clap(requires("format_out"))]
     DBus,
+    GVariant,
     Json,
     //Json5,    // NOTE: The crate is not noted "(deserialization only)" on the [serde listing](https://serde.rs/#data-formats) but it does not expose a `Serializer`
     //SExpression,
@@ -107,6 +108,24 @@ fn de(opt: &Opt, input: &mut dyn Read, output: &mut dyn Write) {
             );
             ser(opt, &mut deserializer, output);
         }
+        Input::GVariant => {
+            use zvariant::gvariant::Deserializer;
+            use zvariant::EncodingContext;
+            use zvariant::Signature;
+
+            use byteorder::LE;
+
+            let sig = opt.format_in.clone().unwrap();
+            let mut buf = String::new();
+            let _buf_size = input.read_to_string(&mut buf).unwrap();
+            let mut deserializer = Deserializer::new(
+                buf.as_bytes(),
+                None,
+                &Signature::try_from(sig).unwrap(),
+                EncodingContext::<LE>::new_dbus(0),
+            );
+            ser(opt, &mut deserializer, output);
+        }
         Input::Json => {
             use serde_json::Deserializer;
 
@@ -189,7 +208,29 @@ where
             let mut out = std::io::Cursor::new(vec![]);
             let mut fs = vec![];
             let serializer = &mut Serializer::new(
-                &Signature::try_from(dbg!(sig)).unwrap(),
+                &Signature::try_from(sig).unwrap(),
+                &mut out,
+                &mut fs, //None,
+                EncodingContext::<LE>::new_dbus(0),
+            );
+
+            //let mut buf = String::new();
+            //           let _buf_size = output.read_to_string(&mut buf).unwrap();
+            //            let mut deserializer = Deserializer::new();
+            serde_transcode::transcode(deserializer, serializer).unwrap();
+        }
+        Output::GVariant => {
+            use zvariant::gvariant::Serializer;
+            use zvariant::EncodingContext;
+            use zvariant::Signature;
+
+            use byteorder::LE;
+
+            let sig = opt.format_out.clone().unwrap();
+            let mut out = std::io::Cursor::new(vec![]);
+            let mut fs = vec![];
+            let serializer = &mut Serializer::new(
+                &Signature::try_from(sig).unwrap(),
                 &mut out,
                 &mut fs, //None,
                 EncodingContext::<LE>::new_dbus(0),