From 52cc4d65378992dabd37d91c00a6327d82687c54 Mon Sep 17 00:00:00 2001
From: Charlie Marsh <charlie.r.marsh@gmail.com>
Date: Wed, 15 Feb 2023 12:08:34 -0500
Subject: [PATCH] Deduplicate files provided on the command-line (#2931)

---
 crates/ruff/src/resolver.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/crates/ruff/src/resolver.rs b/crates/ruff/src/resolver.rs
index fae2805712..be8b4804ba 100644
--- a/crates/ruff/src/resolver.rs
+++ b/crates/ruff/src/resolver.rs
@@ -7,6 +7,7 @@ use std::sync::RwLock;
 
 use anyhow::{anyhow, bail, Result};
 use ignore::{DirEntry, WalkBuilder, WalkState};
+use itertools::Itertools;
 use log::debug;
 use path_absolutize::path_dedot;
 use rustc_hash::FxHashSet;
@@ -217,7 +218,7 @@ pub fn python_files_in_path(
     processor: impl ConfigProcessor,
 ) -> Result<(Vec<Result<DirEntry, ignore::Error>>, Resolver)> {
     // Normalize every path (e.g., convert from relative to absolute).
-    let mut paths: Vec<PathBuf> = paths.iter().map(fs::normalize_path).collect();
+    let mut paths: Vec<PathBuf> = paths.iter().map(fs::normalize_path).unique().collect();
 
     // Search for `pyproject.toml` files in all parent directories.
     let mut resolver = Resolver::default();