Clippy fixes (also fixes build with nightly) (#1527)

src/compiler.rs

@@ -29,9 +29,9 @@ pub struct CodeFetchOutput {
 }
 
 impl CodeFetchOutput {
-  pub fn js_source<'a>(&'a self) -> String {
+  pub fn js_source(&self) -> String {
     if self.media_type == msg::MediaType::Json {
-      return String::from(format!("export default {};", self.source_code));
+      return format!("export default {};", self.source_code);
     }
     match self.maybe_output_code {
       None => self.source_code.clone(),

src/deno_dir.rs

@@ -265,10 +265,10 @@ impl DenoDir {
     if let Some(output) = maybe_remote_source {
       return Ok(output);
     }
-    return Err(DenoError::from(std::io::Error::new(
+    Err(DenoError::from(std::io::Error::new(
       std::io::ErrorKind::NotFound,
       format!("cannot find remote file '{}'", filename),
-    )));
+    )))
   }
 
   pub fn code_fetch(
@@ -371,7 +371,7 @@ impl DenoDir {
       specifier, referrer
     );
 
-    if referrer.starts_with(".") {
+    if referrer.starts_with('.') {
       let cwd = std::env::current_dir().unwrap();
       let referrer_path = cwd.join(referrer);
       referrer = referrer_path.to_str().unwrap().to_string() + "/";
@@ -423,16 +423,10 @@ impl DenoDir {
 impl SourceMapGetter for DenoDir {
   fn get_source_map(&self, script_name: &str) -> Option<String> {
     match self.code_fetch(script_name, ".") {
-      Err(_e) => {
-        return None;
-      }
+      Err(_e) => None,
       Ok(out) => match out.maybe_source_map {
-        None => {
-          return None;
-        }
-        Some(source_map) => {
-          return Some(source_map);
-        }
+        None => None,
+        Some(source_map) => Some(source_map),
       },
     }
   }
@@ -941,15 +935,9 @@ mod tests {
     let test_cases = [
       (
         "./subdir/print_hello.ts",
-        add_root!(
-          "/Users/rld/go/src/github.com/denoland/deno/testdata/006_url_imports.ts"
-        ),
-        add_root!(
-          "/Users/rld/go/src/github.com/denoland/deno/testdata/subdir/print_hello.ts"
-        ),
-        add_root!(
-          "/Users/rld/go/src/github.com/denoland/deno/testdata/subdir/print_hello.ts"
-        ),
+        add_root!("/Users/rld/go/src/github.com/denoland/deno/testdata/006_url_imports.ts"),
+        add_root!("/Users/rld/go/src/github.com/denoland/deno/testdata/subdir/print_hello.ts"),
+        add_root!("/Users/rld/go/src/github.com/denoland/deno/testdata/subdir/print_hello.ts"),
       ),
       (
         "testdata/001_hello.js",

src/flags.rs

@@ -312,17 +312,12 @@ pub fn v8_set_flags(args: Vec<String>) -> Vec<String> {
   // Store the length of the c_argv array in a local variable. We'll pass
   // a pointer to this local variable to deno_set_v8_flags(), which then
   // updates its value.
-  #[cfg_attr(
-    feature = "cargo-clippy",
-    allow(cast_possible_truncation, cast_possible_wrap)
-  )]
   let mut c_argv_len = c_argv.len() as c_int;
   // Let v8 parse the arguments it recognizes and remove them from c_argv.
   unsafe {
     libdeno::deno_set_v8_flags(&mut c_argv_len, c_argv.as_mut_ptr());
   };
   // If c_argv_len was updated we have to change the length of c_argv to match.
-  #[cfg_attr(feature = "cargo-clippy", allow(cast_sign_loss))]
   c_argv.truncate(c_argv_len as usize);
   // Copy the modified arguments list into a proper rust vec and return it.
   c_argv

src/isolate.rs

@@ -89,7 +89,7 @@ impl IsolateState {
       permissions: DenoPermissions::new(&flags),
       flags,
       metrics: Metrics::default(),
-      worker_channels: worker_channels.map(|wc| Mutex::new(wc)),
+      worker_channels: worker_channels.map(Mutex::new),
     }
   }
 
@@ -212,7 +212,7 @@ impl Isolate {
 
   pub fn last_exception(&self) -> Option<JSError> {
     let ptr = unsafe { libdeno::deno_last_exception(self.libdeno_isolate) };
-    if ptr == std::ptr::null() {
+    if ptr.is_null() {
       None
     } else {
       let cstr = unsafe { CStr::from_ptr(ptr) };
@@ -220,7 +220,7 @@ impl Isolate {
       debug!("v8_exception\n{}\n", v8_exception);
       let js_error = JSError::from_v8_exception(v8_exception).unwrap();
       let js_error_mapped = js_error.apply_source_map(&self.state.dir);
-      return Some(js_error_mapped);
+      Some(js_error_mapped)
     }
   }
 

src/js_errors.rs

@@ -60,7 +60,7 @@ impl ToString for StackFrame {
   fn to_string(&self) -> String {
     // Note when we print to string, we change from 0-indexed to 1-indexed.
     let (line, column) = (self.line + 1, self.column + 1);
-    if self.function_name.len() > 0 {
+    if !self.function_name.is_empty() {
       format!(
         "    at {} ({}:{}:{})",
         self.function_name, self.script_name, line, column
@@ -228,10 +228,10 @@ impl SourceMap {
     // Ugly. Maybe use serde_derive.
     match serde_json::from_str::<serde_json::Value>(json_str) {
       Ok(serde_json::Value::Object(map)) => match map["mappings"].as_str() {
-        None => return None,
+        None => None,
         Some(mappings_str) => {
           match parse_mappings::<()>(mappings_str.as_bytes()) {
-            Err(_) => return None,
+            Err(_) => None,
             Ok(mappings) => {
               if !map["sources"].is_array() {
                 return None;
@@ -248,12 +248,12 @@ impl SourceMap {
                 }
               }
 
-              return Some(SourceMap { sources, mappings });
+              Some(SourceMap { sources, mappings })
             }
           }
         }
       },
-      _ => return None,
+      _ => None,
     }
   }
 }

src/main.rs

@@ -1,25 +1,4 @@
 // Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
-use dirs;
-use flatbuffers;
-use getopts;
-use http;
-use hyper;
-use hyper_rustls;
-use libc;
-use rand;
-use remove_dir_all;
-use ring;
-use rustyline;
-use source_map_mappings;
-use tempfile;
-use tokio;
-use tokio_executor;
-use tokio_fs;
-use tokio_io;
-use tokio_process;
-use tokio_threadpool;
-use url;
-
 #[macro_use]
 extern crate lazy_static;
 #[macro_use]

src/msg.rs

@@ -1,6 +1,9 @@
 #![allow(unused_imports)]
 #![allow(dead_code)]
-#![cfg_attr(feature = "cargo-clippy", allow(clippy, pedantic))]
+#![cfg_attr(
+  feature = "cargo-clippy",
+  allow(clippy::all, clippy::pedantic)
+)]
 use flatbuffers;
 use std::sync::atomic::Ordering;
 

src/ops.rs

@@ -1003,7 +1003,6 @@ fn op_read_dir(
             path: Some(path),
             mode: get_mode(&metadata.permissions()),
             has_mode: cfg!(target_family = "unix"),
-            ..Default::default()
           },
         )
       }).collect();
@@ -1172,9 +1171,6 @@ fn op_repl_readline(
   let prompt = inner.prompt().unwrap().to_owned();
   debug!("op_repl_readline {} {}", rid, prompt);
 
-  // Ignore this clippy warning until this issue is addressed:
-  // https://github.com/rust-lang-nursery/rust-clippy/issues/1684
-  #[cfg_attr(feature = "cargo-clippy", allow(redundant_closure_call))]
   blocking(base.sync(), move || -> OpResult {
     let line = resources::readline(rid, &prompt)?;
 
@@ -1237,9 +1233,6 @@ fn op_listen(
   assert_eq!(network, "tcp");
   let address = inner.address().unwrap();
 
-  // Ignore this clippy warning until this issue is addressed:
-  // https://github.com/rust-lang-nursery/rust-clippy/issues/1684
-  #[cfg_attr(feature = "cargo-clippy", allow(redundant_closure_call))]
   Box::new(futures::future::result((move || {
     let addr = resolve_addr(address).wait()?;
 

src/repl.rs

@@ -71,7 +71,7 @@ impl Repl {
     repl
   }
 
-  fn load_history(&mut self) -> () {
+  fn load_history(&mut self) {
     debug!("Loading REPL history: {:?}", self.history_file);
     self
       .editor

src/resolve_addr.rs

@@ -60,7 +60,7 @@ impl Future for ResolveAddrFuture {
         // I absolutely despise the .to_socket_addrs() API.
         let r = addr_port_pair
           .to_socket_addrs()
-          .map_err(|e| ResolveAddrError::Resolution(e));
+          .map_err(ResolveAddrError::Resolution);
 
         r.and_then(|mut iter| match iter.next() {
           Some(a) => Ok(Async::Ready(a)),
@@ -71,11 +71,11 @@ impl Future for ResolveAddrFuture {
   }
 }
 
-fn split<'a>(address: &'a str) -> Option<(&'a str, u16)> {
-  address.rfind(":").and_then(|i| {
+fn split(address: &str) -> Option<(&str, u16)> {
+  address.rfind(':').and_then(|i| {
     let (a, p) = address.split_at(i);
     // Default to localhost if given just the port. Example: ":80"
-    let addr = if a.len() > 0 { a } else { "0.0.0.0" };
+    let addr = if !a.is_empty() { a } else { "0.0.0.0" };
     // If this looks like an ipv6 IP address. Example: "[2001:db8::1]"
     // Then we remove the brackets.
     let addr = if addr.starts_with('[') && addr.ends_with(']') {

src/resources.rs

@@ -452,7 +452,7 @@ pub fn eager_read<T: AsMut<[u8]>>(
   resource: Resource,
   mut buf: T,
 ) -> EagerRead<Resource, T> {
-  Either::A(tokio_io::io::read(resource, buf)).into()
+  Either::A(tokio_io::io::read(resource, buf))
 }
 
 #[cfg(not(unix))]
@@ -460,12 +460,12 @@ pub fn eager_write<T: AsRef<[u8]>>(
   resource: Resource,
   buf: T,
 ) -> EagerWrite<Resource, T> {
-  Either::A(tokio_write::write(resource, buf)).into()
+  Either::A(tokio_write::write(resource, buf))
 }
 
 #[cfg(not(unix))]
 pub fn eager_accept(resource: Resource) -> EagerAccept {
-  Either::A(tokio_util::accept(resource)).into()
+  Either::A(tokio_util::accept(resource))
 }
 
 // This is an optimization that Tokio should do.

src/workers.rs

@@ -83,9 +83,7 @@ pub fn spawn(
       resource.close();
     }).unwrap();
 
-  let resource = c.wait().unwrap();
-
-  resource
+  c.wait().unwrap()
 }
 
 #[cfg(test)]