Extract project model to separate crate

crates/ra_project_model/src/lib.rs

@@ -0,0 +1,45 @@
+mod cargo_workspace;
+mod sysroot;
+
+use std::path::{Path, PathBuf};
+
+use failure::bail;
+
+pub use crate::{
+    cargo_workspace::{CargoWorkspace, Package, Target, TargetKind},
+    sysroot::Sysroot,
+};
+
+// TODO use own error enum?
+pub type Result<T> = ::std::result::Result<T, ::failure::Error>;
+
+#[derive(Debug, Clone)]
+pub struct ProjectWorkspace {
+    pub cargo: CargoWorkspace,
+    pub sysroot: Sysroot,
+}
+
+impl ProjectWorkspace {
+    pub fn discover(path: &Path) -> Result<ProjectWorkspace> {
+        let cargo_toml = find_cargo_toml(path)?;
+        let cargo = CargoWorkspace::from_cargo_metadata(&cargo_toml)?;
+        let sysroot = Sysroot::discover(&cargo_toml)?;
+        let res = ProjectWorkspace { cargo, sysroot };
+        Ok(res)
+    }
+}
+
+fn find_cargo_toml(path: &Path) -> Result<PathBuf> {
+    if path.ends_with("Cargo.toml") {
+        return Ok(path.to_path_buf());
+    }
+    let mut curr = Some(path);
+    while let Some(path) = curr {
+        let candidate = path.join("Cargo.toml");
+        if candidate.exists() {
+            return Ok(candidate);
+        }
+        curr = path.parent();
+    }
+    bail!("can't find Cargo.toml at {}", path.display())
+}