From 45af4a251e99ad435e354ae55bdbeab2327292ec Mon Sep 17 00:00:00 2001
From: Dan Bluhm Hansen <00.pavers_dither@icloud.com>
Date: Thu, 4 Apr 2024 19:35:40 +0200
Subject: [PATCH] get `.crates2.json` from `$CARGO_HOME` if present

---
 crates/pacdef_core/src/backend/actual/rust.rs |  3 +--
 crates/pacdef_core/src/path.rs                | 16 ++++++++++++++++
 2 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/crates/pacdef_core/src/backend/actual/rust.rs b/crates/pacdef_core/src/backend/actual/rust.rs
index b168008..d5a2cdd 100644
--- a/crates/pacdef_core/src/backend/actual/rust.rs
+++ b/crates/pacdef_core/src/backend/actual/rust.rs
@@ -86,8 +86,7 @@ impl Rust {
 }
 
 fn get_crates_file() -> Result<PathBuf> {
-    let mut result = crate::path::get_home_dir().context("getting home dir")?;
-    result.push(".cargo");
+    let mut result = crate::path::get_cargo_home().context("getting cargo home dir")?;
     result.push(".crates2.json");
     Ok(result)
 }
diff --git a/crates/pacdef_core/src/path.rs b/crates/pacdef_core/src/path.rs
index 0c69299..03bcada 100644
--- a/crates/pacdef_core/src/path.rs
+++ b/crates/pacdef_core/src/path.rs
@@ -34,6 +34,22 @@ pub(crate) fn get_pacdef_base_dir() -> Result<PathBuf> {
     Ok(dir)
 }
 
+/// Get the path to the cargo home directory.
+///
+/// # Errors
+///
+/// This function will return an error if neither the `$CARGO_HOME` nor
+/// the `$HOME` environment variables are set.
+pub(crate) fn get_cargo_home() -> Result<PathBuf> {
+    if let Ok(config) = env::var("CARGO_HOME") {
+        Ok(config.into())
+    } else {
+        let mut config = get_home_dir().context("falling back to $HOME/.cargo")?;
+        config.push(".cargo");
+        Ok(config)
+    }
+}
+
 /// Get the path to the XDG config directory.
 ///
 /// # Errors