Merge pull request #82 from paritytech/pack-cli

Standalone wasm-pack binary

cli/Cargo.toml

@@ -29,6 +29,10 @@ path = "build/main.rs"
 name = "wasm-stack-height"
 path = "stack_height/main.rs"
 
+[[bin]]
+name = "wasm-pack"
+path = "pack/main.rs"
+
 [dependencies]
 parity-wasm = "0.30"
 pwasm-utils = { path = "..", version = "0.2" }

cli/pack/main.rs

@@ -0,0 +1,35 @@
+extern crate parity_wasm;
+extern crate pwasm_utils as utils;
+extern crate pwasm_utils_cli as logger;
+extern crate clap;
+
+use clap::{App, Arg};
+
+fn main() {
+    logger::init_log();
+
+    let matches = App::new("wasm-pack")
+                        .arg(Arg::with_name("input")
+                            .index(1)
+                            .required(true)
+                            .help("Input WASM file"))
+                        .arg(Arg::with_name("output")
+                            .index(2)
+                            .required(true)
+                            .help("Output WASM file"))
+                        .get_matches();
+
+    let input = matches.value_of("input").expect("is required; qed");
+    let output = matches.value_of("output").expect("is required; qed");
+
+    let module = parity_wasm::deserialize_file(&input).expect("Input module deserialization failed");
+    let ctor_module = module.clone();
+	let raw_module = parity_wasm::serialize(module).expect("Serialization failed");
+
+    // Invoke packer
+    let mut result_module = utils::pack_instance(raw_module, ctor_module).expect("Packing failed");
+    // Optimize constructor, since it does not need everything
+    utils::optimize(&mut result_module, vec![utils::CALL_SYMBOL]).expect("Optimization failed");
+
+    parity_wasm::serialize_to_file(&output, result_module).expect("Serialization failed");
+}