Support uv export --no-header (#8096)

## Summary

Resolves #8063

## Test Plan

`cargo test`

crates/uv-cli/src/lib.rs

@@ -3162,6 +3162,13 @@ pub struct ExportArgs {
     #[arg(long, conflicts_with("no_dev"))]
     pub only_dev: bool,
 
+    /// Exclude the comment header at the top of the generated output file.
+    #[arg(long, overrides_with("header"))]
+    pub no_header: bool,
+
+    #[arg(long, overrides_with("no_header"), hide = true)]
+    pub header: bool,
+
     /// Install any editable dependencies, including the project and any workspace members, as
     /// non-editable.
     #[arg(long)]

crates/uv/src/commands/project/export.rs

@@ -37,6 +37,7 @@ pub(crate) async fn export(
     editable: EditableMode,
     locked: bool,
     frozen: bool,
+    include_header: bool,
     python: Option<String>,
     settings: ResolverSettings,
     python_preference: PythonPreference,
@@ -147,12 +148,15 @@ pub(crate) async fn export(
                 hashes,
                 &install_options,
             )?;
-            writeln!(
-                writer,
-                "{}",
-                "# This file was autogenerated by uv via the following command:".green()
-            )?;
-            writeln!(writer, "{}", format!("#    {}", cmd()).green())?;
+
+            if include_header {
+                writeln!(
+                    writer,
+                    "{}",
+                    "# This file was autogenerated by uv via the following command:".green()
+                )?;
+                writeln!(writer, "{}", format!("#    {}", cmd()).green())?;
+            }
             write!(writer, "{export}")?;
         }
     }

crates/uv/src/lib.rs

@@ -1464,6 +1464,7 @@ async fn run_project(
                 args.editable,
                 args.locked,
                 args.frozen,
+                args.include_header,
                 args.python,
                 args.settings,
                 globals.python_preference,

crates/uv/src/settings.rs

@@ -996,6 +996,7 @@ pub(crate) struct ExportSettings {
     pub(crate) output_file: Option<PathBuf>,
     pub(crate) locked: bool,
     pub(crate) frozen: bool,
+    pub(crate) include_header: bool,
     pub(crate) python: Option<String>,
     pub(crate) refresh: Refresh,
     pub(crate) settings: ResolverSettings,
@@ -1014,6 +1015,8 @@ impl ExportSettings {
             dev,
             no_dev,
             only_dev,
+            header,
+            no_header,
             no_editable,
             hashes,
             no_hashes,
@@ -1047,6 +1050,7 @@ impl ExportSettings {
             output_file,
             locked,
             frozen,
+            include_header: flag(header, no_header).unwrap_or(true),
             python: python.and_then(Maybe::into_option),
             refresh: Refresh::from(refresh),
             settings: ResolverSettings::combine(resolver_options(resolver, build), filesystem),

crates/uv/tests/export.rs

@@ -54,6 +54,49 @@ fn dependency() -> Result<()> {
     Ok(())
 }
 
+#[test]
+fn export_no_header() -> Result<()> {
+    let context = TestContext::new("3.12");
+
+    let pyproject_toml = context.temp_dir.child("pyproject.toml");
+    pyproject_toml.write_str(
+        r#"
+        [project]
+        name = "project"
+        version = "0.1.0"
+        requires-python = ">=3.12"
+        dependencies = ["anyio==3.7.0"]
+
+        [build-system]
+        requires = ["setuptools>=42"]
+        build-backend = "setuptools.build_meta"
+        "#,
+    )?;
+
+    context.lock().assert().success();
+
+    uv_snapshot!(context.filters(), context.export().arg("--no-header"), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+    -e .
+    anyio==3.7.0 \
+        --hash=sha256:275d9973793619a5374e1c89a4f4ad3f4b0a5510a2b5b939444bee8f4c4d37ce \
+        --hash=sha256:eddca883c4175f14df8aedce21054bfca3adb70ffe76a9f607aef9d7fa2ea7f0
+    idna==3.6 \
+        --hash=sha256:9ecdbbd083b06798ae1e86adcbfe8ab1479cf864e4ee30fe4e46a003d12491ca \
+        --hash=sha256:c05567e9c24a6b9faaa835c4821bad0590fbb9d5779e7caa6e1cc4978e7eb24f
+    sniffio==1.3.1 \
+        --hash=sha256:f4324edc670a0f49750a81b895f35c3adb843cca46f0530f79fc1babb23789dc \
+        --hash=sha256:2f6da418d1f1e0fddd844478f41680e794e6051915791a034ff65e5f100525a2
+
+    ----- stderr -----
+    Resolved 4 packages in [TIME]
+    "###);
+
+    Ok(())
+}
+
 #[test]
 fn dependency_extra() -> Result<()> {
     let context = TestContext::new("3.12");

docs/reference/cli.md

@@ -2042,6 +2042,8 @@ uv export [OPTIONS]
 
 </dd><dt><code>--no-hashes</code></dt><dd><p>Omit hashes in the generated output</p>
 
+</dd><dt><code>--no-header</code></dt><dd><p>Exclude the comment header at the top of the generated output file</p>
+
 </dd><dt><code>--no-index</code></dt><dd><p>Ignore the registry index (e.g., PyPI), instead relying on direct URL dependencies and those provided via <code>--find-links</code></p>
 
 </dd><dt><code>--no-progress</code></dt><dd><p>Hide all progress outputs.</p>