1 files changed, 47 insertions, 0 deletions

diff --git a/fondant_deps/src/lib.rs b/fondant_deps/src/lib.rs
new file mode 100644
index 0000000..6f62ce8
--- /dev/null
+++ b/fondant_deps/src/lib.rs
@@ -0,0 +1,47 @@
+pub mod fondant_exports {
+    pub use directories::{ProjectDirs, UserDirs};
+    pub use serde::{de::DeserializeOwned, Serialize};
+    pub use serde_json;
+    pub use serde_yaml;
+    use std::path::{Path, PathBuf};
+    pub use toml;
+    pub fn expand_tilde<P: AsRef<Path>>(path: P) -> PathBuf {
+        let p = path.as_ref();
+        if p.starts_with("~") {
+            if p == Path::new("~") {
+                return UserDirs::new().unwrap().home_dir().to_path_buf();
+            } else {
+                let mut h = UserDirs::new().unwrap().home_dir().to_path_buf();
+                h.push(p.strip_prefix("~/").unwrap());
+                return h;
+            }
+        }
+        return p.to_path_buf();
+    }
+}
+
+use serde::{de::DeserializeOwned, Serialize};
+#[derive(Debug)]
+/// Errors that `load` and `store` can result in
+pub enum FondantError {
+    /// Occurs when the home dir is not accessible.
+    /// You should probably `panic!` when this is thrown.
+    InvalidHomeDir,
+
+    /// Invalid toml/yaml/json config.
+    ConfigParseError,
+
+    /// Invalid permissions to create config dir.
+    /// Might occur when you set config dir to, say, `/etc/config.toml` and run without superuser.
+    DirCreateErr(std::io::Error),
+    LoadError,
+    FileWriteError,
+    FileReadError,
+    FileOpenError,
+}
+
+/// Derive this trait on a struct to mark it as a 'configuration' struct.
+pub trait Configure: Serialize + DeserializeOwned + Default {
+    fn load() -> Result<Self, FondantError>;
+    fn store(&self) -> Result<(), FondantError>;
+}