Update helpers.rs (#6255)

Simplified conditions and variables for better understanding and
readability.

## Description


## Checklist

- [x] I have linked to any relevant issues.
- [x] I have commented my code, particularly in hard-to-understand
areas.
- [x] I have updated the documentation where relevant (API docs, the
reference, and the Sway book).
- [x] If my change requires substantial documentation changes, I have
[requested support from the DevRel
team](https://github.com/FuelLabs/devrel-requests/issues/new/choose)
- [x] I have added tests that prove my fix is effective or that my
feature works.
- [x] I have added (or requested a maintainer to add) the necessary
`Breaking*` or `New Feature` labels where relevant.
- [x] I have done my best to ensure that my PR adheres to [the Fuel Labs
Code Review
Standards](https://github.com/FuelLabs/rfcs/blob/master/text/code-standards/external-contributors.md).
- [x] I have requested a review from the relevant team or maintainers.

---------

Co-authored-by: cypherpepe <cypherfrog@skiff.com>
Co-authored-by: IGI-111 <igi-111@protonmail.com>

sway-utils/src/helpers.rs

@@ -4,14 +4,15 @@ use std::{
     fs,
     path::{Path, PathBuf},
 };
+use walkdir::WalkDir;
 
 pub fn get_sway_files(path: PathBuf) -> Vec<PathBuf> {
     let mut files = vec![];
     let mut dir_entries = vec![path];
 
     while let Some(next_dir) = dir_entries.pop() {
-        if let Ok(read_dir) = fs::read_dir(next_dir) {
-            for entry in read_dir.filter_map(std::result::Result::ok) {
+        if let Ok(read_dir) = fs::read_dir(&next_dir) {
+            for entry in read_dir.filter_map(Result::ok) {
                 let path = entry.path();
                 if path.is_dir() {
                     dir_entries.push(path);
@@ -25,11 +26,10 @@ pub fn get_sway_files(path: PathBuf) -> Vec<PathBuf> {
 }
 
 pub fn is_sway_file(file: &Path) -> bool {
-    let res = file.extension();
-    file.is_file() && Some(OsStr::new(constants::SWAY_EXTENSION)) == res
+    file.is_file() && file.extension() == Some(OsStr::new(constants::SWAY_EXTENSION))
 }
 
-/// create an iterator over all prefixes in a slice, smallest first
+/// Create an iterator over all prefixes in a slice, smallest first
 ///
 /// ```
 /// # use sway_utils::iter_prefixes;
@@ -39,7 +39,6 @@ pub fn is_sway_file(file: &Path) -> bool {
 /// assert_eq!(it.next(), Some([1, 2].as_slice()));
 /// assert_eq!(it.next(), Some([1, 2, 3].as_slice()));
 /// assert_eq!(it.next(), None);
-///
 /// ```
 pub fn iter_prefixes<T>(slice: &[T]) -> impl DoubleEndedIterator<Item = &[T]> {
     (1..=slice.len()).map(move |len| &slice[..len])
@@ -54,16 +53,14 @@ pub fn find_nested_manifest_dir(starter_path: &Path) -> Option<PathBuf> {
 ///
 /// Starts the search from child dirs of `starter_path`.
 pub fn find_nested_dir_with_file(starter_path: &Path, file_name: &str) -> Option<PathBuf> {
-    use walkdir::WalkDir;
     let starter_dir = if starter_path.is_dir() {
         starter_path
     } else {
         starter_path.parent()?
     };
     WalkDir::new(starter_path).into_iter().find_map(|e| {
         let entry = e.ok()?;
-        if entry.path() != starter_dir.join(file_name)
-            && entry.file_name().to_string_lossy() == file_name
+        if entry.path() != starter_dir.join(file_name) && entry.file_name() == OsStr::new(file_name)
         {
             let mut entry = entry.path().to_path_buf();
             entry.pop();
@@ -77,14 +74,13 @@ pub fn find_nested_dir_with_file(starter_path: &Path, file_name: &str) -> Option
 /// Continually go up in the file tree until a specified file is found.
 ///
 /// Starts the search from `starter_path`.
-#[allow(clippy::branches_sharing_code)]
 pub fn find_parent_dir_with_file<P: AsRef<Path>>(
     starter_path: P,
     file_name: &str,
 ) -> Option<PathBuf> {
     let mut path = std::fs::canonicalize(starter_path).ok()?;
-    let empty_path = PathBuf::from("/");
-    while path != empty_path {
+    let root_path = PathBuf::from("/");
+    while path != root_path {
         path.push(file_name);
         if path.exists() {
             path.pop();
@@ -95,28 +91,29 @@ pub fn find_parent_dir_with_file<P: AsRef<Path>>(
     }
     None
 }
+
 /// Continually go up in the file tree until a Forc manifest file is found.
 pub fn find_parent_manifest_dir<P: AsRef<Path>>(starter_path: P) -> Option<PathBuf> {
     find_parent_dir_with_file(starter_path, constants::MANIFEST_FILE_NAME)
 }
 
-/// Continually go up in the file tree until a Forc manifest file is found and given predicate
+/// Continually go up in the file tree until a Forc manifest file is found and the given predicate
 /// returns true.
 pub fn find_parent_manifest_dir_with_check<T: AsRef<Path>, F>(
     starter_path: T,
-    f: F,
+    check: F,
 ) -> Option<PathBuf>
 where
     F: Fn(&Path) -> bool,
 {
-    find_parent_manifest_dir(starter_path).and_then(|manifest_dir| {
-        // If given check satisfies return current dir otherwise start searching from the parent.
-        if f(&manifest_dir) {
+    find_parent_manifest_dir(&starter_path).and_then(|manifest_dir| {
+        // If given check satisfies, return the current dir; otherwise, start searching from the parent.
+        if check(&manifest_dir) {
             Some(manifest_dir)
-        } else if let Some(parent_dir) = manifest_dir.parent() {
-            find_parent_manifest_dir_with_check(parent_dir, f)
         } else {
-            None
+            manifest_dir
+                .parent()
+                .and_then(|parent_dir| find_parent_manifest_dir_with_check(parent_dir, check))
         }
     })
 }