Remove dependency on dirs crate, use home instead

Cargo.toml

@@ -12,11 +12,13 @@ categories = ["os", "filesystem"]
 keywords = ["which", "which-rs", "unix", "command"]
 
 [dependencies]
-dirs = "5.0.1"
 either = "1.6.1"
 regex = { version = "1.5.5", optional = true }
 rustix = { version = "0.38.10", default-features = false, features = ["fs", "std"] }
 
+[target.'cfg(any(windows, unix, target_os = "redox"))'.dependencies]
+home = "0.5.5"
+
 [target.'cfg(windows)'.dependencies]
 once_cell = "1"
 

src/finder.rs

@@ -2,7 +2,6 @@ use crate::checker::CompositeChecker;
 use crate::error::*;
 #[cfg(windows)]
 use crate::helper::has_executable_extension;
-use dirs::home_dir;
 use either::Either;
 #[cfg(feature = "regex")]
 use regex::Regex;
@@ -16,6 +15,15 @@ use std::fs;
 use std::iter;
 use std::path::{Component, Path, PathBuf};
 
+// Home dir shim, use home crate when possible. Otherwise, return None
+#[cfg(any(windows, unix, target_os = "redox"))]
+use home::home_dir;
+
+#[cfg(not(any(windows, unix, target_os = "redox")))]
+fn home_dir() -> Option<std::path::PathBuf> {
+    None
+}
+
 pub trait Checker {
     fn is_valid(&self, path: &Path) -> bool;
 }