Fixing clippy warnings

util/src/keys/store.rs

@@ -78,9 +78,15 @@ struct AccountUnlock {
 	expires: DateTime<UTC>,
 }
 
+impl Default for SecretStore {
+	fn default() -> Self {
+		SecretStore::new()
+	}
+}
+
 impl SecretStore {
 	/// new instance of Secret Store in default home directory
-	pub fn new() -> SecretStore {
+	pub fn new() -> Self {
 		let mut path = ::std::env::home_dir().expect("Failed to get home dir");
 		path.push(".parity");
 		path.push("keys");
@@ -89,7 +95,7 @@ impl SecretStore {
 	}
 
 	/// new instance of Secret Store in specific directory
-	pub fn new_in(path: &Path) -> SecretStore {
+	pub fn new_in(path: &Path) -> Self {
 		SecretStore {
 			directory: KeyDirectory::new(path),
 			unlocks: RwLock::new(HashMap::new()),

util/src/kvdb.rs

@@ -16,6 +16,7 @@
 
 //! Key-Value store abstraction with RocksDB backend.
 
+use std::default::Default;
 use rocksdb::{DB, Writable, WriteBatch, IteratorMode, DBVector, DBIterator,
 	IndexType, Options, DBCompactionStyle, BlockBasedOptions, Direction};
 
@@ -24,6 +25,12 @@ pub struct DBTransaction {
 	batch: WriteBatch,
 }
 
+impl Default for DBTransaction {
+	fn default() -> Self {
+		DBTransaction::new()
+	}
+}
+
 impl DBTransaction {
 	/// Create new transaction.
 	pub fn new() -> DBTransaction {

util/src/lib.rs

@@ -27,6 +27,8 @@
 #![cfg_attr(all(nightly, feature="dev"), allow(match_same_arms))]
 // Keeps consistency (all lines with `.clone()`) and helpful when changing ref to non-ref.
 #![cfg_attr(all(nightly, feature="dev"), allow(clone_on_copy))]
+// In most cases it expresses function flow better
+#![cfg_attr(all(nightly, feature="dev"), allow(if_not_else))]
 
 //! Ethcore-util library
 //!

util/src/memorydb.rs

@@ -24,6 +24,7 @@ use hashdb::*;
 use heapsize::*;
 use std::mem;
 use std::collections::HashMap;
+use std::default::Default;
 
 #[derive(Debug,Clone)]
 /// Reference-counted memory-based HashDB implementation.
@@ -32,7 +33,7 @@ use std::collections::HashMap;
 /// with `kill()`, check for existance with `exists()` and lookup a hash to derive
 /// the data with `lookup()`. Clear with `clear()` and purge the portions of the data
 /// that have no references with `purge()`.
-/// 
+///
 /// # Example
 /// ```rust
 /// extern crate ethcore_util;
@@ -74,6 +75,12 @@ pub struct MemoryDB {
 	static_null_rlp: (Bytes, i32),
 }
 
+impl Default for MemoryDB {
+	fn default() -> Self {
+		MemoryDB::new()
+	}
+}
+
 impl MemoryDB {
 	/// Create a new instance of the memory DB.
 	pub fn new() -> MemoryDB {
@@ -133,7 +140,7 @@ impl MemoryDB {
 
 	/// Denote than an existing value has the given key. Used when a key gets removed without
 	/// a prior insert and thus has a negative reference with no value.
-	/// 
+	///
 	/// May safely be called even if the key's value is known, in which case it will be a no-op.
 	pub fn denote(&self, key: &H256, value: Bytes) -> &(Bytes, i32) {
 		if self.raw(key) == None {

util/src/network/discovery.rs

@@ -19,6 +19,7 @@ use std::net::SocketAddr;
 use std::collections::{HashSet, HashMap, BTreeMap, VecDeque};
 use std::mem;
 use std::cmp;
+use std::default::Default;
 use mio::*;
 use mio::udp::*;
 use sha3::*;
@@ -62,8 +63,14 @@ struct NodeBucket {
 	nodes: VecDeque<BucketEntry>, //sorted by last active
 }
 
+impl Default for NodeBucket {
+	fn default() -> Self {
+		NodeBucket::new()
+	}
+}
+
 impl NodeBucket {
-	fn new() -> NodeBucket {
+	fn new() -> Self {
 		NodeBucket {
 			nodes: VecDeque::new()
 		}

util/src/network/host.rs

@@ -23,6 +23,7 @@ use std::ops::*;
 use std::cmp::min;
 use std::path::{Path, PathBuf};
 use std::io::{Read, Write};
+use std::default::Default;
 use std::fs;
 use mio::*;
 use mio::tcp::*;
@@ -75,9 +76,15 @@ pub struct NetworkConfiguration {
 	pub ideal_peers: u32,
 }
 
+impl Default for NetworkConfiguration {
+	fn default() -> Self {
+		NetworkConfiguration::new()
+	}
+}
+
 impl NetworkConfiguration {
 	/// Create a new instance of default settings.
-	pub fn new() -> NetworkConfiguration {
+	pub fn new() -> Self {
 		NetworkConfiguration {
 			config_path: None,
 			listen_address: None,

util/src/panics.rs

@@ -19,6 +19,7 @@
 use std::thread;
 use std::ops::DerefMut;
 use std::sync::{Arc, Mutex};
+use std::default::Default;
 
 /// Thread-safe closure for handling possible panics
 pub trait OnPanicListener: Send + Sync + 'static {
@@ -56,14 +57,20 @@ pub struct PanicHandler {
 	listeners: Mutex<Vec<Box<OnPanicListener>>>
 }
 
+impl Default for PanicHandler {
+	fn default() -> Self {
+		PanicHandler::new()
+	}
+}
+
 impl PanicHandler {
 	/// Creates new `PanicHandler` wrapped in `Arc`
-	pub fn new_in_arc() -> Arc<PanicHandler> {
+	pub fn new_in_arc() -> Arc<Self> {
 		Arc::new(Self::new())
 	}
 
 	/// Creates new `PanicHandler`
-	pub fn new() -> PanicHandler {
+	pub fn new() -> Self {
 		PanicHandler {
 			listeners: Mutex::new(vec![])
 		}

util/src/rlp/rlpstream.rs

@@ -15,6 +15,7 @@
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
 use std::ops::Deref;
+use std::default::Default;
 use elastic_array::*;
 use rlp::bytes::{ToBytes, VecLike};
 use rlp::{Stream, Encoder, Encodable};
@@ -44,6 +45,12 @@ pub struct RlpStream {
 	finished_list: bool,
 }
 
+impl Default  for RlpStream {
+	fn default() -> Self {
+		RlpStream::new()
+	}
+}
+
 impl Stream for RlpStream {
 	fn new() -> Self {
 		RlpStream {
@@ -190,8 +197,14 @@ struct BasicEncoder {
 	bytes: ElasticArray1024<u8>,
 }
 
+impl Default for BasicEncoder {
+	fn default() -> Self {
+		BasicEncoder::new()
+	}
+}
+
 impl BasicEncoder {
-	fn new() -> BasicEncoder {
+	fn new() -> Self {
 		BasicEncoder { bytes: ElasticArray1024::new() }
 	}
 
@@ -222,7 +235,7 @@ impl Encoder for BasicEncoder {
 			// just 0
 			0 => self.bytes.push(0x80u8),
 			// byte is its own encoding if < 0x80
-			1 => { 
+			1 => {
 				value.to_bytes(&mut self.bytes);
 				let len = self.bytes.len();
 				let last_byte = self.bytes[len - 1];

util/src/table.rs

@@ -16,6 +16,7 @@
 
 //! A collection associating pair of keys (row and column) with a single value.
 
+use std::default::Default;
 use std::hash::Hash;
 use std::collections::HashMap;
 
@@ -30,11 +31,21 @@ pub struct Table<Row, Col, Val>
 	map: HashMap<Row, HashMap<Col, Val>>,
 }
 
+impl<Row, Col, Val> Default for Table<Row, Col, Val>
+	where Row: Eq + Hash + Clone,
+		  Col: Eq + Hash {
+	fn default() -> Self {
+		Table::new()
+	}
+}
+
+// There is default but clippy does not detect it?
+#[allow(new_without_default)]
 impl<Row, Col, Val> Table<Row, Col, Val>
 	where Row: Eq + Hash + Clone,
 		  Col: Eq + Hash {
 	/// Creates new Table
-	pub fn new() -> Table<Row, Col, Val> {
+	pub fn new() -> Self {
 		Table {
 			map: HashMap::new(),
 		}

util/src/trie/journal.rs

@@ -14,6 +14,7 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
+use std::default::Default;
 use sha3::*;
 use hash::H256;
 use bytes::*;
@@ -39,6 +40,12 @@ pub struct Score {
 #[derive(Debug)]
 pub struct Journal (Vec<Operation>);
 
+impl Default for Journal {
+	fn default() -> Self {
+		Journal::new()
+	}
+}
+
 impl Journal {
 	/// Create a new, empty, object.
 	pub fn new() -> Journal { Journal(vec![]) }