Merge pull request rustwasm#1084 from David-OConnor/master

Added an --out-name param to the CLI, to allow custom output file names

crates/cli-support/src/lib.rs

@@ -27,6 +27,7 @@ mod wasm_utils;
 
 pub struct Bindgen {
     input: Input,
+    out_name: Option<String>,
     nodejs: bool,
     nodejs_experimental_modules: bool,
     browser: bool,
@@ -56,6 +57,7 @@ impl Bindgen {
     pub fn new() -> Bindgen {
         Bindgen {
             input: Input::None,
+            out_name: None,
             nodejs: false,
             nodejs_experimental_modules: false,
             browser: false,
@@ -77,6 +79,11 @@ impl Bindgen {
         self
     }
 
+    pub fn out_name(&mut self, name: &str) -> &mut Bindgen {
+        self.out_name = Some(name.to_string());
+        self
+    }
+
     /// Explicitly specify the already parsed input module.
     pub fn input_module(&mut self, name: &str, module: Module) -> &mut Bindgen {
         let name = name.to_string();
@@ -155,7 +162,10 @@ impl Bindgen {
                     .with_context(|_| format!("failed to read `{}`", path.display()))?;
                 let module = parity_wasm::deserialize_buffer::<Module>(&contents)
                     .context("failed to parse input file as wasm")?;
-                let stem = path.file_stem().unwrap().to_str().unwrap();
+                let stem = match &self.out_name {
+                    Some(name) => &name,
+                    None => path.file_stem().unwrap().to_str().unwrap(),
+                };
                 (module, stem)
             }
         };

crates/cli/src/bin/wasm-bindgen.rs

@@ -29,6 +29,7 @@ Usage:
 Options:
     -h --help                Show this screen.
     --out-dir DIR            Output directory
+    --out-name VAR           Set a custom output filename (Without extension. Defaults to crate name)
     --nodejs                 Generate output that only works in node.js
     --browser                Generate output that only works in a browser
     --no-modules             Generate output that only works in a browser (without modules)
@@ -50,6 +51,7 @@ struct Args {
     flag_typescript: bool,
     flag_no_typescript: bool,
     flag_out_dir: Option<PathBuf>,
+    flag_out_name: Option<String>,
     flag_debug: bool,
     flag_version: bool,
     flag_no_demangle: bool,
@@ -101,6 +103,9 @@ fn rmain(args: &Args) -> Result<(), Error> {
     if let Some(ref name) = args.flag_no_modules_global {
         b.no_modules_global(name);
     }
+    if let Some(ref name) = args.flag_out_name {
+        b.out_name(name);
+    }
 
     let out_dir = match args.flag_out_dir {
         Some(ref p) => p,