Support shell expansion for --config argument

crates/ruff_cli/Cargo.toml

@@ -50,6 +50,7 @@ regex = { workspace = true }
 rustc-hash = { workspace = true }
 serde = { workspace = true }
 serde_json = { workspace = true }
+shellexpand = { version = "3.0.0" }
 similar = { version = "2.2.1" }
 strum = { version = "0.24.1" }
 textwrap = { version = "0.16.0" }

crates/ruff_cli/src/resolve.rs

@@ -1,12 +1,14 @@
-use std::path::Path;
+use std::path::{Path, PathBuf};
 
 use anyhow::Result;
 use path_absolutize::path_dedot;
+
 use ruff::resolver::{
     resolve_settings_with_processor, ConfigProcessor, PyprojectDiscovery, Relativity,
 };
 use ruff::settings::configuration::Configuration;
 use ruff::settings::{pyproject, AllSettings};
+use shellexpand;
 
 use crate::args::Overrides;
 
@@ -29,8 +31,12 @@ pub fn resolve(
     // Second priority: the user specified a `pyproject.toml` file. Use that
     // `pyproject.toml` for _all_ configuration, and resolve paths relative to the
     // current working directory. (This matches ESLint's behavior.)
-    if let Some(pyproject) = config {
-        let settings = resolve_settings_with_processor(pyproject, &Relativity::Cwd, overrides)?;
+    if let Some(pyproject) = config
+        .map(|config| config.display().to_string())
+        .map(|config| shellexpand::full(&config).map(|config| PathBuf::from(config.as_ref())))
+        .transpose()?
+    {
+        let settings = resolve_settings_with_processor(&pyproject, &Relativity::Cwd, overrides)?;
         return Ok(PyprojectDiscovery::Fixed(settings));
     }