Avoid writing invalid PEP 723 scripts on tool.uv.sources

crates/uv-scripts/src/lib.rs

@@ -347,13 +347,12 @@ fn serialize_metadata(metadata: &str) -> String {
     output.push('\n');
 
     for line in metadata.lines() {
-        if line.is_empty() {
-            output.push('\n');
-        } else {
-            output.push_str("# ");
+        output.push('#');
+        if !line.is_empty() {
+            output.push(' ');
             output.push_str(line);
-            output.push('\n');
         }
+        output.push('\n');
     }
 
     output.push_str("# ///");

crates/uv/tests/edit.rs

@@ -3792,6 +3792,58 @@ fn add_script_without_metadata_table_with_docstring() -> Result<()> {
     Ok(())
 }
 
+/// Add to a PEP 732 script with a `tool.uv.sources` dependency.
+#[test]
+fn add_script_sources() -> Result<()> {
+    let context = TestContext::new("3.12");
+
+    let script = context.temp_dir.child("script.py");
+    script.write_str(indoc! {r#"
+        import requests
+        from rich.pretty import pprint
+
+        resp = requests.get("https://peps.python.org/api/peps.json")
+        data = resp.json()
+        pprint([(k, v["title"]) for k, v in data.items()][:10])
+    "#})?;
+
+    uv_snapshot!(context.filters(), context.add(&["anyio @ git+https://github.com/agronholm/anyio"]).arg("--script").arg("script.py"), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+
+    ----- stderr -----
+    Updated `script.py`
+    "###);
+
+    let script_content = fs_err::read_to_string(context.temp_dir.join("script.py"))?;
+
+    insta::with_settings!({
+        filters => context.filters(),
+    }, {
+        assert_snapshot!(
+            script_content, @r###"
+        # /// script
+        # requires-python = ">=3.12"
+        # dependencies = [
+        #     "anyio",
+        # ]
+        #
+        # [tool.uv.sources]
+        # anyio = { git = "https://github.com/agronholm/anyio" }
+        # ///
+        import requests
+        from rich.pretty import pprint
+
+        resp = requests.get("https://peps.python.org/api/peps.json")
+        data = resp.json()
+        pprint([(k, v["title"]) for k, v in data.items()][:10])
+        "###
+        );
+    });
+    Ok(())
+}
+
 /// Remove from a PEP732 script,
 #[test]
 fn remove_script() -> Result<()> {