Add decode to Message Pack (compact variant)

Cargo.toml

@@ -30,6 +30,7 @@ clap = { version = "4.2.4", default-features = false, features = ["std", "derive
 serde_json = { version = "1.0.89", optional = true }
 thiserror = { version = "1.0.37", optional = true }
 schemars = { version = "0.8.16", optional = true }
+rmp-serde = { version = "1.3.0", optional = true }
 
 [dev-dependencies]
 serde_json = "1.0.89"
@@ -50,7 +51,7 @@ arbitrary = ["std", "dep:arbitrary"]
 hex = []
 
 # Features for the CLI.
-cli = ["std", "curr", "next", "base64", "serde", "serde_json", "schemars", "dep:clap", "dep:thiserror"]
+cli = ["std", "curr", "next", "base64", "serde", "serde_json", "schemars", "dep:clap", "dep:thiserror", "dep:rmp-serde"]
 
 [package.metadata.docs.rs]
 all-features = true

src/cli/decode.rs

@@ -23,6 +23,8 @@ pub enum Error {
     ReadFile(#[from] std::io::Error),
     #[error("error generating JSON: {0}")]
     GenerateJson(#[from] serde_json::Error),
+    #[error("error generating message pack: {0}")]
+    GenerateMessagePack(#[from] rmp_serde::encode::Error),
 }
 
 #[derive(Args, Debug, Clone)]
@@ -66,6 +68,7 @@ pub enum OutputFormat {
     JsonFormatted,
     RustDebug,
     RustDebugFormatted,
+    MessagePack,
 }
 
 impl Default for OutputFormat {
@@ -158,6 +161,10 @@ impl Cmd {
             OutputFormat::JsonFormatted => println!("{}", serde_json::to_string_pretty(v)?),
             OutputFormat::RustDebug => println!("{v:?}"),
             OutputFormat::RustDebugFormatted => println!("{v:#?}"),
+            OutputFormat::MessagePack => {
+                let mut out = std::io::stdout();
+                rmp_serde::encode::write(&mut out, v).map_err(Error::GenerateMessagePack)?;
+            }
         }
         Ok(())
     }