fix(cli): made system tools cache XDG-compliant

See
<https://users.rust-lang.org/t/advice-on-adding-arbitrary-data-to-cargo/78449>
for further details.

packages/perseus-cli/Cargo.toml

@@ -40,7 +40,7 @@ tokio-stream = "0.1"
 reqwest = { version = "0.11", features = [ "json", "stream" ] }
 tar = "0.4"
 flate2 = "1"
-home = "0.5"
+directories = "4"
 
 [dev-dependencies]
 assert_cmd = "2"

packages/perseus-cli/src/bin/main.rs

@@ -1,7 +1,7 @@
 use clap::Parser;
 use command_group::stdlib::CommandGroup;
+use directories::ProjectDirs;
 use fmterr::fmt_err;
-use home::home_dir;
 use notify::{recommended_watcher, RecursiveMode, Watcher};
 use perseus_cli::parse::{ExportOpts, ServeOpts, SnoopSubcommand};
 use perseus_cli::{
@@ -55,8 +55,8 @@ async fn real_main() -> i32 {
                 if let Err(err) = delete_artifacts(dir.clone(), "tools") {
                     eprintln!("{}", fmt_err(&err));
                 }
-                if let Some(path) = home_dir() {
-                    let target = path.join(".cargo/perseus_tools");
+                if let Some(dirs) = ProjectDirs::from("", "perseus", "perseus_cli") {
+                    let target = dirs.cache_dir().join("tools");
                     if target.exists() {
                         if let Err(err) = std::fs::remove_dir_all(&target) {
                             let err = ExecutionError::RemoveArtifactsFailed {

packages/perseus-cli/src/install.rs

@@ -2,9 +2,9 @@ use crate::cmd::{cfg_spinner, fail_spinner, succeed_spinner};
 use crate::errors::*;
 use crate::parse::Opts;
 use console::Emoji;
+use directories::ProjectDirs;
 use flate2::read::GzDecoder;
 use futures::future::try_join;
-use home::home_dir;
 use indicatif::ProgressBar;
 use reqwest::Client;
 use std::borrow::BorrowMut;
@@ -32,14 +32,13 @@ static INSTALLING: Emoji<'_, '_> = Emoji("📥", "");
 /// If the user specifies that we're running on CI, we'll use the local version
 /// regardless.
 pub fn get_tools_dir(project: &Path, no_system_cache: bool) -> Result<PathBuf, InstallError> {
-    match home_dir() {
-        Some(path) if !no_system_cache => {
-            let target = path.join(".cargo/perseus_tools");
+    match ProjectDirs::from("", "perseus", "perseus_cli") {
+        Some(dirs) if !no_system_cache => {
+            let target = dirs.cache_dir().join("tools");
             if target.exists() {
-                Ok(target)
+                Ok(target.to_path_buf())
             } else {
-                // Try to create the system-wide cache (this will create `~/.cargo/` as well if
-                // necessary)
+                // Try to create the system-wide cache
                 if fs::create_dir_all(&target).is_ok() {
                     Ok(target)
                 } else {