1 files changed, 58 insertions, 0 deletions
diff --git a/src/tools/clippy/clippy_dev/src/lib.rs b/src/tools/clippy/clippy_dev/src/lib.rs
new file mode 100644
index 000000000..82574a8e6
--- /dev/null
+++ b/src/tools/clippy/clippy_dev/src/lib.rs
@@ -0,0 +1,58 @@
+#![feature(let_chains)]
+#![feature(let_else)]
+#![feature(once_cell)]
+#![feature(rustc_private)]
+#![cfg_attr(feature = "deny-warnings", deny(warnings))]
+// warn on lints, that are included in `rust-lang/rust`s bootstrap
+#![warn(rust_2018_idioms, unused_lifetimes)]
+
+extern crate rustc_lexer;
+
+use std::path::PathBuf;
+
+pub mod bless;
+pub mod dogfood;
+pub mod fmt;
+pub mod lint;
+pub mod new_lint;
+pub mod serve;
+pub mod setup;
+pub mod update_lints;
+
+#[cfg(not(windows))]
+static CARGO_CLIPPY_EXE: &str = "cargo-clippy";
+#[cfg(windows)]
+static CARGO_CLIPPY_EXE: &str = "cargo-clippy.exe";
+
+/// Returns the path to the `cargo-clippy` binary
+#[must_use]
+pub fn cargo_clippy_path() -> PathBuf {
+    let mut path = std::env::current_exe().expect("failed to get current executable name");
+    path.set_file_name(CARGO_CLIPPY_EXE);
+    path
+}
+
+/// Returns the path to the Clippy project directory
+///
+/// # Panics
+///
+/// Panics if the current directory could not be retrieved, there was an error reading any of the
+/// Cargo.toml files or ancestor directory is the clippy root directory
+#[must_use]
+pub fn clippy_project_root() -> PathBuf {
+    let current_dir = std::env::current_dir().unwrap();
+    for path in current_dir.ancestors() {
+        let result = std::fs::read_to_string(path.join("Cargo.toml"));
+        if let Err(err) = &result {
+            if err.kind() == std::io::ErrorKind::NotFound {
+                continue;
+            }
+        }
+
+        let content = result.unwrap();
+        if content.contains("[package]\nname = \"clippy\"") {
+            return path.to_path_buf();
+        }
+    }
+    panic!("error: Can't determine root of project. Please run inside a Clippy working dir.");
+}