feat: Add base for settings, and relocate venv-name default to it.

Cargo.toml

@@ -40,6 +40,7 @@ directories = { version = "5.0.1" }
 dirs = { version = "5.0.1" }
 dunce = { version = "1.0.4" }
 either = { version = "1.9.0" }
+etcetera = { version = "0.8.0" }
 flate2 = { version = "1.0.28", default-features = false }
 fs-err = { version = "2.11.0" }
 fs2 = { version = "0.4.3" }
@@ -97,6 +98,7 @@ tokio-stream = { version = "0.1.14" }
 tokio-tar = { version = "0.3.1" }
 tokio-util = { version = "0.7.10", features = ["compat"] }
 toml = { version = "0.8.8" }
+toml_edit = { version = "0.22" }
 tracing = { version = "0.1.40" }
 tracing-durations-export = { version = "0.2.0", features = ["plot"] }
 tracing-indicatif = { version = "0.3.6" }

crates/uv/Cargo.toml

@@ -44,6 +44,7 @@ clap = { workspace = true, features = ["derive"] }
 console = { workspace = true }
 ctrlc = { workspace = true  }
 dunce = { workspace = true }
+etcetera = { workspace = true }
 flate2 = { workspace = true, default-features = false }
 fs-err = { workspace = true, features = ["tokio"] }
 futures = { workspace = true }
@@ -59,6 +60,7 @@ textwrap = { workspace = true }
 thiserror = { workspace = true }
 tokio = { workspace = true }
 toml = { workspace = true }
+toml_edit = { workspace = true }
 tracing = { workspace = true }
 tracing-durations-export = { workspace = true, features = ["plot"], optional = true }
 tracing-subscriber = { workspace = true }

crates/uv/src/main.rs

@@ -47,6 +47,7 @@ mod confirm;
 mod logging;
 mod printer;
 mod requirements;
+mod settings;
 
 #[derive(Parser)]
 #[command(author, version, about)]
@@ -647,9 +648,8 @@ struct VenvArgs {
     #[clap(long)]
     seed: bool,
 
-    /// The path to the virtual environment to create.
-    #[clap(default_value = ".venv")]
-    name: PathBuf,
+    /// The path to the virtual environment to create. Defaults to .venv.
+    name: Option<PathBuf>,
 
     /// The URL of the Python Package Index.
     #[clap(long, short, default_value = IndexUrl::Pypi.as_str(), env = "UV_INDEX_URL")]
@@ -1003,6 +1003,9 @@ async fn run() -> Result<ExitStatus> {
         }) => commands::freeze(&cache, args.strict, printer),
         Commands::Clean(args) => commands::clean(&cache, &args.package, printer),
         Commands::Venv(args) => {
+            let mut settings = settings::Settings::read()?;
+            settings.set_venv_name(args.name);
+
             args.compat_args.validate()?;
 
             let index_locations = IndexLocations::from_args(
@@ -1013,7 +1016,7 @@ async fn run() -> Result<ExitStatus> {
                 args.no_index,
             );
             commands::venv(
-                &args.name,
+                &settings.venv_name,
                 args.python.as_deref(),
                 &index_locations,
                 if args.offline {

crates/uv/src/settings.rs

@@ -0,0 +1,49 @@
+use etcetera::base_strategy::{BaseStrategy, Xdg};
+use std::fs::File;
+use std::io::{BufReader, Read};
+use std::path::{Path, PathBuf};
+use toml_edit::Document;
+
+pub(crate) struct Settings {
+    pub(crate) venv_name: PathBuf,
+}
+
+impl Settings {
+    pub(crate) fn read() -> anyhow::Result<Self> {
+        let strategy = Xdg::new()?;
+        let config_dir = strategy.config_dir().join("uv");
+
+        let config_file = config_dir.with_extension("toml");
+
+        let content = read_file(&config_file);
+        let document = content.parse::<Document>().unwrap_or(Document::new());
+
+        let venv_name = PathBuf::from(
+            document
+                .get("venv-name")
+                .and_then(|v| v.as_str())
+                .unwrap_or(".venv")
+                .to_string(),
+        );
+
+        Ok(Self { venv_name })
+    }
+
+    pub(crate) fn set_venv_name(&mut self, maybe_name: Option<PathBuf>) {
+        if let Some(name) = maybe_name {
+            self.venv_name = name;
+        }
+    }
+}
+
+fn read_file(path: &Path) -> String {
+    if let Ok(file) = File::open(path) {
+        let mut reader = BufReader::new(file);
+
+        let mut contents = String::new();
+        reader.read_to_string(&mut contents).unwrap_or(0);
+        contents
+    } else {
+        String::new()
+    }
+}