Add support for Pickle a Python serialization format

Cargo.lock

@@ -31,6 +31,12 @@ version = "1.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
 
+[[package]]
+name = "byteorder"
+version = "1.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
+
 [[package]]
 name = "clap"
 version = "3.2.20"
@@ -101,6 +107,12 @@ dependencies = [
  "hashbrown",
 ]
 
+[[package]]
+name = "iter-read"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c397ca3ea05ad509c4ec451fea28b4771236a376ca1c69fd5143aae0cf8f93c4"
+
 [[package]]
 name = "itoa"
 version = "1.0.3"
@@ -113,6 +125,36 @@ version = "0.2.132"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8371e4e5341c3a96db127eb2465ac681ced4c433e01dd0e938adbef26ba93ba5"
 
+[[package]]
+name = "num-bigint"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f93ab6289c7b344a8a9f60f88d80aa20032336fe78da341afc91c8a2341fc75f"
+dependencies = [
+ "autocfg",
+ "num-integer",
+ "num-traits",
+]
+
+[[package]]
+name = "num-integer"
+version = "0.1.45"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "225d3389fb3509a24c93f5c29eb6bde2586b98d9f016636dff58d7c6f7569cd9"
+dependencies = [
+ "autocfg",
+ "num-traits",
+]
+
+[[package]]
+name = "num-traits"
+version = "0.2.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "578ede34cf02f8924ab9447f50c28075b4d3e5b269972345e7e0372b38c6cdcd"
+dependencies = [
+ "autocfg",
+]
+
 [[package]]
 name = "once_cell"
 version = "1.14.0"
@@ -193,6 +235,19 @@ dependencies = [
  "serde_derive",
 ]
 
+[[package]]
+name = "serde-pickle"
+version = "1.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c762ad136a26407c6a80825813600ceeab5e613660d93d79a41f0ec877171e71"
+dependencies = [
+ "byteorder",
+ "iter-read",
+ "num-bigint",
+ "num-traits",
+ "serde",
+]
+
 [[package]]
 name = "serde-transcode"
 version = "1.1.1"
@@ -276,6 +331,7 @@ dependencies = [
  "clap",
  "ron",
  "serde",
+ "serde-pickle",
  "serde-transcode",
  "serde_json",
  "serde_yaml",

Cargo.toml

@@ -24,6 +24,9 @@ serde-transcode = "1.1.1"
 
 # Data types we support
 # Should tend to be equal to the official list of data formats supported by serde: https://serde.rs/#data-formats
-ron = "0.8"
+#ciborium = "0.2"
 serde_json = "1.0"
+serde-pickle = "1.0"
+ron = "0.8"
+#toml = "0.5"
 serde_yaml = "0.9"

src/lib.rs

@@ -24,6 +24,7 @@ pub struct Opt {
 #[derive(Copy, Clone, Debug, ValueEnum)]
 pub enum Input {
     Json,
+    Pickle,
     Ron,
     Yaml,
 }
@@ -31,6 +32,7 @@ pub enum Input {
 #[derive(Copy, Clone, Debug, ValueEnum)]
 pub enum Output {
     Json,
+    Pickle,
     Ron,
     Yaml,
 }
@@ -61,6 +63,12 @@ fn de(opt: &Opt, input: &mut dyn Read, output: &mut dyn Write) {
             let mut deserializer = Deserializer::from_reader(input);
             ser(opt, &mut deserializer, output);
         }
+        Input::Pickle => {
+            use serde_pickle::Deserializer;
+
+            let mut deserializer = Deserializer::new(input, serde_pickle::DeOptions::new());
+            ser(opt, &mut deserializer, output);
+        }
         Input::Ron => {
             use ron::Deserializer;
 
@@ -102,6 +110,13 @@ where
             // NOTE: serde_json’s PrettyFormatter and CompactFormatter are incompatibles…
             // serde_transcode::transcode(deserializer, serializer).unwrap();
         }
+        Output::Pickle => {
+            use serde_pickle::Serializer;
+
+            let serializer = &mut Serializer::new(output, serde_pickle::SerOptions::new());
+
+            serde_transcode::transcode(deserializer, serializer).unwrap();
+        }
         Output::Ron => {
             use ron::Serializer;