Respect verbatim executable name in uvx

Author: charliermarsh

crates/uv/src/commands/tool/run.rs

@@ -529,6 +529,21 @@ async fn get_or_create_environment(
             // Ex) `ruff>=0.6.0`
             Target::Unspecified(requirement) => {
                 let spec = RequirementsSpecification::parse_package(requirement)?;
+
+                // Extract the verbatim executable name, if possible.
+                let name = match &spec.requirement {
+                    UnresolvedRequirement::Named(..) => {
+                        // Identify the package name from the PEP 508 specifier.
+                        //
+                        // For example, given `ruff>=0.6.0`, extract `ruff`, to use as the executable name.
+                        let index = requirement
+                            .find(|c| !matches!(c, 'A'..='Z' | 'a'..='z' | '0'..='9' | '-' | '_' | '.'))
+                            .unwrap_or(requirement.len());
+                        Some(&requirement[..index])
+                    }
+                    UnresolvedRequirement::Unnamed(..) => None,
+                };
+
                 if let UnresolvedRequirement::Named(requirement) = &spec.requirement {
                     if requirement.name.as_str() == "python" {
                         return Err(anyhow::anyhow!(
@@ -539,6 +554,7 @@ async fn get_or_create_environment(
                         .into());
                     }
                 }
+
                 let requirement = resolve_names(
                     vec![spec],
                     &interpreter,
@@ -556,12 +572,14 @@ async fn get_or_create_environment(
                 .pop()
                 .unwrap();
 
-                // Use the executable provided by the user, if possible (as in: `uvx --from package executable`).
-                //
-                // If no such executable was provided, rely on the package name (as in: `uvx git+https://github.com/pallets/flask`).
+                // Prefer, in order:
+                // 1. The verbatim executable provided by the user, independent of the requirement (as in: `uvx --from package executable`).
+                // 2. The verbatim executable provided by the user as a named requirement (as in: `uvx change_wheel_version`).
+                // 3. The resolved package name (as in: `uvx git+https://github.com/pallets/flask`).
                 let executable = request
                     .executable
                     .map(ToString::to_string)
+                    .or_else(|| name.map(ToString::to_string))
                     .unwrap_or_else(|| requirement.name.to_string());
 
                 (executable, requirement)

crates/uv/tests/it/tool_run.rs

@@ -1810,3 +1810,63 @@ fn tool_run_from_at() {
      + executable-application==0.2.0
     "###);
 }
+
+#[test]
+fn tool_run_verbatim_name() {
+    let context = TestContext::new("3.12").with_filtered_counts();
+    let tool_dir = context.temp_dir.child("tools");
+    let bin_dir = context.temp_dir.child("bin");
+
+    // The normalized package name is `change-wheel-version`, but the executable is `change_wheel_version`.
+    // As such, this should fail.
+    uv_snapshot!(context.filters(), context.tool_run()
+        .arg("change-wheel-version")
+        .arg("--help")
+        .env(EnvVars::UV_TOOL_DIR, tool_dir.as_os_str())
+        .env(EnvVars::XDG_BIN_HOME, bin_dir.as_os_str()), @r###"
+    success: false
+    exit_code: 1
+    ----- stdout -----
+    The executable `change-wheel-version` was not found.
+    The following executables are provided by `change-wheel-version`:
+    - change_wheel_version
+    Consider using `uv tool run --from change-wheel-version <EXECUTABLE_NAME>` instead.
+
+    ----- stderr -----
+    Resolved [N] packages in [TIME]
+    Prepared [N] packages in [TIME]
+    Installed [N] packages in [TIME]
+     + change-wheel-version==0.5.0
+     + installer==0.7.0
+     + packaging==24.0
+     + wheel==0.43.0
+    warning: An executable named `change-wheel-version` is not provided by package `change-wheel-version`.
+    "###);
+
+    uv_snapshot!(context.filters(), context.tool_run()
+        .arg("change_wheel_version")
+        .arg("--help")
+        .env(EnvVars::UV_TOOL_DIR, tool_dir.as_os_str())
+        .env(EnvVars::XDG_BIN_HOME, bin_dir.as_os_str()), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+    usage: change_wheel_version [-h] [--local-version LOCAL_VERSION]
+                                [--version VERSION] [--delete-old-wheel]
+                                [--allow-same-version]
+                                wheel
+
+    positional arguments:
+      wheel
+
+    options:
+      -h, --help            show this help message and exit
+      --local-version LOCAL_VERSION
+      --version VERSION
+      --delete-old-wheel
+      --allow-same-version
+
+    ----- stderr -----
+    Resolved [N] packages in [TIME]
+    "###);
+}