refactor(rust): cleanup path handling

- Avoids unnecessary string allocation when tracing paths
- Replaces `mut path & path.push()` with `path.join()`
- Avoids unncessary cloning of paths where applicable
- Use `dunce` crate to remove `UNC` prefix
- Improve performance of resolving `~` by avoiding unnecessary string allocations
- Resolve `~`, `$Env:USERPROFILE` and `$HOME` consistenly between different code paths
- Use `PathBuf` instead of `String` for paths in CLI args

I may have missed a couple of places but I think I covered 90% of path handling in the codebase

komorebi-core/src/custom_layout.rs

@@ -3,9 +3,10 @@ use std::fs::File;
 use std::io::BufReader;
 use std::ops::Deref;
 use std::ops::DerefMut;
-use std::path::PathBuf;
+use std::path::Path;
 
 use color_eyre::eyre::anyhow;
+use color_eyre::eyre::bail;
 use color_eyre::Result;
 use schemars::JsonSchema;
 use serde::Deserialize;
@@ -31,23 +32,20 @@ impl DerefMut for CustomLayout {
 }
 
 impl CustomLayout {
-    pub fn from_path_buf(path: PathBuf) -> Result<Self> {
-        let invalid_filetype = anyhow!("custom layouts must be json or yaml files");
+    pub fn from_path<P: AsRef<Path>>(path: P) -> Result<Self> {
+        let path = path.as_ref();
         let layout: Self = match path.extension() {
-            Some(extension) => {
-                if extension == "yaml" || extension == "yml" {
-                    serde_yaml::from_reader(BufReader::new(File::open(path)?))?
-                } else if extension == "json" {
-                    serde_json::from_reader(BufReader::new(File::open(path)?))?
-                } else {
-                    return Err(invalid_filetype);
-                }
+            Some(extension) if extension == "yaml" || extension == "yml" => {
+                serde_json::from_reader(BufReader::new(File::open(path)?))?
             }
-            None => return Err(invalid_filetype),
+            Some(extension) if extension == "json" => {
+                serde_json::from_reader(BufReader::new(File::open(path)?))?
+            }
+            _ => return Err(anyhow!("custom layouts must be json or yaml files")),
         };
 
         if !layout.is_valid() {
-            return Err(anyhow!("the layout file provided was invalid"));
+            bail!("the layout file provided was invalid");
         }
 
         Ok(layout)