Most of the refactor. Need to switch machines.

retired/nest_lib_rs_old/lib.rs

@@ -0,0 +1,45 @@
+mod class;
+mod dependency;
+mod error;
+//mod lock;
+mod meta;
+mod nest;
+mod package;
+pub mod prelude;
+mod prey;
+mod workspace;
+
+pub use error::{Error, Result};
+
+use std::io;
+use std::path::PathBuf;
+
+pub const FN_NEST: &str = "Nest";
+pub const FN_PREY: &str = "Prey";
+
+pub const F_NEST_TOML: &str = const_format::concatcp!(FN_NEST, fs::EXT_TOML);
+pub const F_NEST_LOCK: &str = const_format::concatcp!(FN_NEST, fs::EXT_LOCK);
+pub const F_PREY_TOML: &str = const_format::concatcp!(FN_PREY, fs::EXT_TOML);
+pub const F_PREY_LOCK: &str = const_format::concatcp!(FN_PREY, fs::EXT_LOCK);
+
+/// Return the location of the parent `Nest.toml` as [`PathBuf`]
+///
+/// # Errors
+///
+/// Possible cases:
+///
+/// * `Nest.toml` cannot be located.
+/// * Current working directory does not exist.
+/// * There are insufficient permissions to access the current directory.
+pub fn locate_nest() -> io::Result<PathBuf> {
+    let cwd = std::env::current_dir()?;
+    let mut probe = cwd.clone();
+
+    while !probe.join(F_NEST_TOML).exists() {
+        if !probe.pop() {
+            return Err(io::ErrorKind::NotFound.into());
+        }
+    }
+
+    Ok(probe)
+}