Merge pull request #19 from ashleygwilliams/example

add js-hello-world example and take a path as an arg

examples/js-hello-world/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "js-hello-world"
+description = "an example rust->wasm crate"
+version = "0.1.0"
+authors = ["Ashley Williams <ashley666ashley@gmail.com>"]
+license = "WTFPL"
+repository = "https://github.com/ashleygwilliams/wasm-pack"
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+wasm-bindgen = { git = 'https://github.com/alexcrichton/wasm-bindgen' }

examples/js-hello-world/src/lib.rs

@@ -0,0 +1,16 @@
+#![feature(proc_macro)]
+
+extern crate wasm_bindgen;
+
+use wasm_bindgen::prelude::*;
+
+#[wasm_bindgen]
+extern {
+    fn alert(s: &str);
+}
+
+#[wasm_bindgen]
+#[no_mangle]
+pub extern fn greet(name: &str) {
+    alert(&format!("Hello, {}!", name));
+}

src/lib.rs

@@ -39,8 +39,8 @@ struct Repository {
     url: String,
 }
 
-fn read_cargo_toml() -> Result<CargoManifest, Error> {
-    let mut cargo_file = File::open("Cargo.toml")?;
+fn read_cargo_toml(path: &str) -> Result<CargoManifest, Error> {
+    let mut cargo_file = File::open(format!("{}/Cargo.toml", path))?;
     let mut cargo_contents = String::new();
     cargo_file.read_to_string(&mut cargo_contents)?;
 
@@ -68,10 +68,10 @@ fn create_pkg_dir() -> Result<(), Error> {
 }
 
 /// Generate a package.json file inside in `./pkg`.
-pub fn write_package_json() -> Result<(), Error> {
+pub fn write_package_json(path: &str) -> Result<(), Error> {
     create_pkg_dir()?;
     let mut pkg_file = File::create("./pkg/package.json")?;
-    let crate_data = read_cargo_toml()?;
+    let crate_data = read_cargo_toml(path)?;
     let npm_data = crate_data.into_npm();
     let npm_json = serde_json::to_string(&npm_data)?;
     pkg_file.write_all(npm_json.as_bytes())?;

src/main.rs

@@ -18,7 +18,7 @@ struct Cli {
 enum Command {
     #[structopt(name = "init")]
     /// 🐣  initialize a package.json based on your compiled wasm
-    Init {},
+    Init { path: Option<String> },
     #[structopt(name = "pack")]
     /// 🍱  create a tar of your npm package but don't publish!
     Pack {},
@@ -28,8 +28,11 @@ enum Command {
 }
 
 main!(|args: Cli, log_level: verbosity| match args.cmd {
-    Command::Init { .. } => {
-        wasm_pack::write_package_json()?;
+    Command::Init { path } => {
+        match path {
+            Some(p) => wasm_pack::write_package_json(&p)?,
+            None => wasm_pack::write_package_json(".")?,
+        }
         println!("✍️  wrote a package.json!");
     }
     Command::Pack { .. } => {

tests/wasm-pack.rs

@@ -3,7 +3,13 @@ extern crate wasm_pack;
 use std::fs;
 
 #[test]
-fn it_creates_a_package_json() {
-    assert!(wasm_pack::write_package_json().is_ok());
+fn it_creates_a_package_json_default_path() {
+    assert!(wasm_pack::write_package_json(".").is_ok());
+    assert!(fs::metadata("./pkg/package.json").is_ok());
+}
+
+#[test]
+fn it_creates_a_package_json_provided_path() {
+    assert!(wasm_pack::write_package_json("./examples/js-hello-world").is_ok());
     assert!(fs::metadata("./pkg/package.json").is_ok());
 }