split test_utils

crates/test_utils_dir/src/lib.rs

@@ -0,0 +1,36 @@
+/**
+ * Creates a temporary empty directory that gets deleted when this goes out of scope.
+ */
+use std::path::PathBuf;
+pub struct TmpDir {
+    path: std::path::PathBuf,
+}
+
+impl TmpDir {
+    pub fn new(dir: &str) -> TmpDir {
+        let path = std::path::Path::new(dir);
+        // ensure_empty_dir will fail if the dir doesn't already exist
+        std::fs::create_dir_all(path).unwrap();
+        remove_dir_all::ensure_empty_dir(path).unwrap();
+
+        let mut pathbuf = std::path::PathBuf::new();
+        pathbuf.push(path);
+        TmpDir { path: pathbuf }
+    }
+
+    pub fn path(&self) -> &std::path::Path {
+        self.path.as_path()
+    }
+}
+
+impl Drop for TmpDir {
+    fn drop(&mut self) {
+        // we "discard" the Result because there is no problem when a dir was already removed before we call remove_dir_all
+        let _ = remove_dir_all::remove_dir_all(&self.path);
+    }
+}
+
+pub fn workspace_root() -> PathBuf {
+    let root = std::env::var("ROC_WORKSPACE_DIR").expect("Can't find the ROC_WORKSPACE_DIR variable expected to be set in .cargo/config.toml. Are you running tests outside of cargo?");
+    PathBuf::from(root)
+}