Apply clippy suggested fixes

src/cli.rs

@@ -28,6 +28,8 @@ pub fn clear_screen() {
     let _ = Command::new("clear").status();
 }
 
+#[allow(unknown_lints)]
+#[allow(or_fun_call)]
 pub fn get_args() -> Args {
     let args = App::new("watchexec")
         .version(crate_version!())

src/main.rs

@@ -130,7 +130,7 @@ fn main() {
     while !interrupt_handler::interrupt_requested() {
         if let Some(paths) = wait(&rx, &interrupt_rx, &filter) {
 
-            if let Some(path) = paths.iter().nth(0) {
+            if let Some(path) = paths.get(0) {
                 debug!("Path updated: {:?}", path);
             }
 

src/process.rs

@@ -202,7 +202,7 @@ impl ProcessReaper {
     }
 }
 
-fn get_single_updated_path<'a>(paths: &'a [PathBuf]) -> Option<&'a str> {
+fn get_single_updated_path(paths: &[PathBuf]) -> Option<&str> {
     paths.get(0).and_then(|p| p.to_str())
 }
 
@@ -238,7 +238,7 @@ fn get_longest_common_path(paths: &[PathBuf]) -> Option<String> {
 
             cur_node = borrowed.children
                 .entry(component)
-                .or_insert(Rc::new(RefCell::new(TreeNode {
+                .or_insert_with(|| Rc::new(RefCell::new(TreeNode {
                     value: component,
                     children: BTreeMap::new(),
                 })))