Refactor codes like clippy suggested

.travis.yml

@@ -1,5 +1,12 @@
-sudo: required
+sudo: false
 language: rust
+addons:
+  apt:
+    packages:
+      - libcurl4-openssl-dev
+      - libelf-dev
+      - libdw-dev
+      - binutils-dev
 rust:
   - stable
   - beta
@@ -7,9 +14,17 @@ rust:
 before_script:
   - pip install 'travis-cargo<0.2' --user && export PATH=$HOME/.local/bin:$PATH
 script:
-  - travis-cargo build
+  - |
+      if [ "$TRAVIS_RUST_VERSION" = nightly ]; then
+          travis-cargo build -- --features clippy
+      else
+          travis-cargo build
+      fi
   - travis-cargo test
-  # - travis-cargo --only stable doc
+  - travis-cargo --only stable doc
 after_success:
-  # - travis-cargo --only stable doc-upload
+  - travis-cargo --only stable doc-upload
-  - travis-cargo coveralls
+  - travis-cargo coveralls --no-sudo --verify
+env:
+  global:
+    secure: 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

Cargo.toml

@@ -1,18 +1,23 @@
 [package]
 authors = ["messense <messense@icloud.com>"]
 description = "robots.txt parser for Rust"
+documentation = "https://messense.github.io/robotparser-rs"
 homepage = "https://github.com/messense/robotparser-rs"
 keywords = ["robot", "robots", "parser", "spider", "crawler"]
 license = "MIT"
 name = "robotparser"
 readme = "README.md"
 repository = "https://github.com/messense/robotparser-rs"
-version = "0.4.0"
+version = "0.4.1"
 
 [dependencies]
 hyper = "0.7"
 time = "0.1"
 url = "0.5"
 
+[dependencies.clippy]
+optional = true
+version = "^0.*"
+
 [features]
 unstable = []

src/lib.rs

@@ -4,6 +4,11 @@
 //! The robots.txt Exclusion Protocol is implemented as specified in
 //! http://www.robotstxt.org/norobots-rfc.txt
 //!
+#![cfg_attr(feature="clippy", feature(plugin))]
+#![cfg_attr(feature="clippy", plugin(clippy))]
+#![cfg_attr(feature="clippy", deny(clippy))]
+#![cfg_attr(feature="clippy", warn(cyclomatic_complexity))]
+
 extern crate url;
 extern crate time;
 extern crate hyper;
@@ -76,7 +81,7 @@ impl Entry {
 
     /// check if this entry applies to the specified agent
     fn applies_to(&self, useragent: &str) -> bool {
-        let ua = useragent.split("/").nth(0).unwrap_or("").to_lowercase();
+        let ua = useragent.split('/').nth(0).unwrap_or("").to_lowercase();
         let useragents = self.useragents.borrow();
         for agent in &*useragents {
             if agent == "*" {
@@ -129,20 +134,17 @@ impl Entry {
     }
 
     fn get_crawl_delay(&self) -> Option<Duration> {
-        return self.crawl_delay.clone();
+        self.crawl_delay
     }
 
     fn add_sitemap(&mut self,url:&str) {
-        match Url::parse(url) {
+        if let Ok(url) = Url::parse(url) {
-            Ok(url) => {
             self.sitemaps.push(url);
-            },
-            Err(_) => {},
         }
     }
 
     fn get_sitemaps(&self) -> Vec<Url> {
-        return self.sitemaps.clone();
+        self.sitemaps.clone()
     }
 }
 
@@ -206,7 +208,7 @@ impl RobotFileParser {
             StatusCode::Ok => {
                 let mut buf = String::new();
                 res.read_to_string(&mut buf).unwrap();
-                let lines: Vec<&str> = buf.split("\n").collect();
+                let lines: Vec<&str> = buf.split('\n').collect();
                 self.parse(&lines);
             },
             _ => {},
@@ -245,7 +247,7 @@ impl RobotFileParser {
 
         self.modified();
         for line in lines {
-            let mut ln = line.as_ref().clone();
+            let mut ln = line.as_ref();
             if ln.is_empty() {
                 match state {
                     1 => {
@@ -261,17 +263,14 @@ impl RobotFileParser {
                 }
             }
             // remove optional comment and strip line
-            match ln.find("#") {
+            if let Some(i) = ln.find('#') {
-                Some(i) => {
                 ln = &ln[0..i];
-                },
-                None => {},
             }
             ln = ln.trim();
             if ln.is_empty() {
                 continue;
             }
-            let parts: Vec<&str> = ln.splitn(2, ":").collect();
+            let parts: Vec<&str> = ln.splitn(2, ':').collect();
             if parts.len() == 2 {
                 let part0 = parts[0].trim().to_lowercase();
                 let part1 = String::from_utf8(percent_decode(parts[1].trim().as_bytes())).unwrap_or("".to_owned());
@@ -298,15 +297,11 @@ impl RobotFileParser {
                     },
                     ref x if x == "crawl-delay" => {
                         if state != 0 {
-                            let delay = part1.parse::<f64>();
+                            if let Ok(delay) = part1.parse::<f64>() {
-                            match delay {
-                                Ok(delay) => {
                                 let delay_seconds = delay.trunc();
                                 let delay_nanoseconds = delay.fract() * 10f64.powi(9);
                                 let delay = Duration::new(delay_seconds as u64,delay_nanoseconds as u32);
                                 entry.set_crawl_delay(delay);
-                                },
-                                Err(_) => {}
                             }
                             state = 2;
                         }  
@@ -380,7 +375,7 @@ impl RobotFileParser {
                 return entry.get_crawl_delay();
             }
         }
-        return None;
+        None
     }
 
     /// Returns the sitemaps for this user agent as a `Vec<Url>`.
@@ -395,6 +390,6 @@ impl RobotFileParser {
                 return entry.get_sitemaps();
             }
         }
-        return Vec::new();
+        vec![]
     }
 }