Add `--no-emit-project` and friends to `uv export` (#7110)

## Summary

Like `uv sync`, you can omit the current project (`--no-emit-project`),
a specific package (`--no-emit-package`), or the entire workspace
(`--no-emit-workspace`).

Closes https://github.com/astral-sh/uv/issues/6960.

Closes #6995.

crates/uv-cli/src/lib.rs

@@ -2970,6 +2970,29 @@ pub struct ExportArgs {
     #[arg(long, short)]
     pub output_file: Option<PathBuf>,
 
+    /// Do not emit the current project.
+    ///
+    /// By default, the current project is included in the exported requirements file with all of its
+    /// dependencies. The `--no-emit-project` option allows the project to be excluded, but all of
+    /// its dependencies to remain included.
+    #[arg(long, alias = "no-install-project")]
+    pub no_emit_project: bool,
+
+    /// Do not emit any workspace members, including the root project.
+    ///
+    /// By default, all workspace members and their dependencies are included in the exported
+    /// requirements file, with all of their dependencies. The `--no-emit-workspace` option allows
+    /// exclusion of all the workspace members while retaining their dependencies.
+    #[arg(long, alias = "no-install-workspace")]
+    pub no_emit_workspace: bool,
+
+    /// Do not emit the given package(s).
+    ///
+    /// By default, all of the project's dependencies are included in the exported requirements
+    /// file. The `--no-install-package` option allows exclusion of specific packages.
+    #[arg(long, alias = "no-install-package")]
+    pub no_emit_package: Vec<PackageName>,
+
     /// Assert that the `uv.lock` will remain unchanged.
     ///
     /// Requires that the lockfile is up-to-date. If the lockfile is missing or

crates/uv-configuration/src/install_options.rs

@@ -80,4 +80,29 @@ impl InstallOptions {
 
         resolution.filter(|dist| !no_install_packages.contains(dist.name()))
     }
+
+    /// Returns `true` if a package passes the install filters.
+    pub fn include_package(
+        &self,
+        package: &PackageName,
+        project_name: &PackageName,
+        members: &BTreeSet<PackageName>,
+    ) -> bool {
+        // If `--no-install-project` is set, remove the project itself.
+        if self.no_install_project && package == project_name {
+            return false;
+        }
+
+        // If `--no-install-workspace` is set, remove the project and any workspace members.
+        if self.no_install_workspace && members.contains(package) {
+            return false;
+        }
+
+        // If `--no-install-package` is provided, remove the requested packages.
+        if self.no_install_package.contains(package) {
+            return false;
+        }
+
+        true
+    }
 }

crates/uv-resolver/src/lock/requirements_txt.rs

@@ -4,7 +4,6 @@ use std::fmt::Formatter;
 use std::path::{Path, PathBuf};
 
 use either::Either;
-use petgraph::graph::NodeIndex;
 use petgraph::visit::IntoNodeReferences;
 use petgraph::{Directed, Graph};
 use rustc_hash::{FxHashMap, FxHashSet};
@@ -13,7 +12,7 @@ use url::Url;
 use distribution_filename::{DistExtension, SourceDistExtension};
 use pep508_rs::MarkerTree;
 use pypi_types::{ParsedArchiveUrl, ParsedGitUrl};
-use uv_configuration::ExtrasSpecification;
+use uv_configuration::{ExtrasSpecification, InstallOptions};
 use uv_fs::Simplified;
 use uv_git::GitReference;
 use uv_normalize::{ExtraName, GroupName, PackageName};
@@ -24,11 +23,16 @@ use crate::{Lock, LockError};
 
 type LockGraph<'lock> = Graph<&'lock Package, Edge, Directed>;
 
+#[derive(Debug, Clone, PartialEq, Eq)]
+struct Node<'lock> {
+    package: &'lock Package,
+    marker: MarkerTree,
+}
+
 /// An export of a [`Lock`] that renders in `requirements.txt` format.
 #[derive(Debug)]
 pub struct RequirementsTxtExport<'lock> {
-    graph: LockGraph<'lock>,
+    nodes: Vec<Node<'lock>>,
-    reachability: FxHashMap<NodeIndex, MarkerTree>,
     hashes: bool,
 }
 
@@ -39,6 +43,7 @@ impl<'lock> RequirementsTxtExport<'lock> {
         extras: &ExtrasSpecification,
         dev: &[GroupName],
         hashes: bool,
+        install_options: &'lock InstallOptions,
     ) -> Result<Self, LockError> {
         let size_guess = lock.packages.len();
         let mut petgraph = LockGraph::with_capacity(size_guess, size_guess);
@@ -123,28 +128,33 @@ impl<'lock> RequirementsTxtExport<'lock> {
             }
         }
 
-        let reachability = marker_reachability(&petgraph, &[]);
+        let mut reachability = marker_reachability(&petgraph, &[]);
 
-        Ok(Self {
+        // Collect all packages.
-            graph: petgraph,
+        let mut nodes: Vec<Node> = petgraph
-            reachability,
+            .node_references()
-            hashes,
+            .filter(|(_index, package)| {
-        })
+                install_options.include_package(&package.id.name, root_name, lock.members())
+            })
+            .map(|(index, package)| Node {
+                package,
+                marker: reachability.remove(&index).unwrap_or_default(),
+            })
+            .collect::<Vec<_>>();
+
+        // Sort the nodes, such that unnamed URLs (editables) appear at the top.
+        nodes.sort_unstable_by(|a, b| {
+            NodeComparator::from(a.package).cmp(&NodeComparator::from(b.package))
+        });
+
+        Ok(Self { nodes, hashes })
     }
 }
 
 impl std::fmt::Display for RequirementsTxtExport<'_> {
     fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
-        // Collect all packages.
-        let mut nodes = self.graph.node_references().collect::<Vec<_>>();
-
-        // Sort the nodes, such that unnamed URLs (editables) appear at the top.
-        nodes.sort_unstable_by(|(_, a), (_, b)| {
-            NodeComparator::from(**a).cmp(&NodeComparator::from(**b))
-        });
-
         // Write out each package.
-        for (node_index, package) in nodes {
+        for Node { package, marker } in &self.nodes {
             match &package.id.source {
                 Source::Registry(_) => {
                     write!(f, "{}=={}", package.id.name, package.id.version)?;
@@ -201,7 +211,7 @@ impl std::fmt::Display for RequirementsTxtExport<'_> {
                 }
             }
 
-            if let Some(contents) = self.reachability[&node_index].contents() {
+            if let Some(contents) = marker.contents() {
                 write!(f, " ; {contents}")?;
             }
 

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

@@ -4,7 +4,7 @@ use std::path::PathBuf;
 
 use uv_cache::Cache;
 use uv_client::Connectivity;
-use uv_configuration::{Concurrency, ExportFormat, ExtrasSpecification};
+use uv_configuration::{Concurrency, ExportFormat, ExtrasSpecification, InstallOptions};
 use uv_fs::CWD;
 use uv_normalize::{PackageName, DEV_DEPENDENCIES};
 use uv_python::{PythonDownloads, PythonPreference, PythonRequest};
@@ -24,6 +24,7 @@ pub(crate) async fn export(
     format: ExportFormat,
     package: Option<PackageName>,
     hashes: bool,
+    install_options: InstallOptions,
     output_file: Option<PathBuf>,
     extras: ExtrasSpecification,
     dev: bool,
@@ -125,6 +126,7 @@ pub(crate) async fn export(
                 &extras,
                 &dev,
                 hashes,
+                &install_options,
             )?;
             writeln!(
                 writer,

crates/uv/src/lib.rs

@@ -1323,6 +1323,7 @@ async fn run_project(
                 args.format,
                 args.package,
                 args.hashes,
+                args.install_options,
                 args.output_file,
                 args.extras,
                 args.dev,

crates/uv/src/settings.rs

@@ -957,6 +957,7 @@ pub(crate) struct ExportSettings {
     pub(crate) extras: ExtrasSpecification,
     pub(crate) dev: bool,
     pub(crate) hashes: bool,
+    pub(crate) install_options: InstallOptions,
     pub(crate) output_file: Option<PathBuf>,
     pub(crate) locked: bool,
     pub(crate) frozen: bool,
@@ -980,6 +981,9 @@ impl ExportSettings {
             hashes,
             no_hashes,
             output_file,
+            no_emit_project,
+            no_emit_workspace,
+            no_emit_package,
             locked,
             frozen,
             resolver,
@@ -997,6 +1001,11 @@ impl ExportSettings {
             ),
             dev: flag(dev, no_dev).unwrap_or(true),
             hashes: flag(hashes, no_hashes).unwrap_or(true),
+            install_options: InstallOptions::new(
+                no_emit_project,
+                no_emit_workspace,
+                no_emit_package,
+            ),
             output_file,
             locked,
             frozen,

crates/uv/tests/export.rs

@@ -695,3 +695,131 @@ fn output_file() -> Result<()> {
 
     Ok(())
 }
+
+#[test]
+fn no_emit() -> 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", "child"]
+
+        [tool.uv.workspace]
+        members = ["child"]
+
+        [tool.uv.sources]
+        child = { workspace = true }
+
+        [build-system]
+        requires = ["setuptools>=42"]
+        build-backend = "setuptools.build_meta"
+        "#,
+    )?;
+
+    let child = context.temp_dir.child("child");
+    child.child("pyproject.toml").write_str(
+        r#"
+        [project]
+        name = "child"
+        version = "0.1.0"
+        requires-python = ">=3.12"
+        dependencies = ["iniconfig>=2"]
+
+        [build-system]
+        requires = ["setuptools>=42"]
+        build-backend = "setuptools.build_meta"
+        "#,
+    )?;
+
+    context.lock().assert().success();
+
+    // Exclude `anyio`.
+    uv_snapshot!(context.filters(), context.export().arg("--no-emit-package").arg("anyio"), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+    # This file was autogenerated via `uv export`.
+    -e .
+    -e child
+    idna==3.6 \
+        --hash=sha256:9ecdbbd083b06798ae1e86adcbfe8ab1479cf864e4ee30fe4e46a003d12491ca \
+        --hash=sha256:c05567e9c24a6b9faaa835c4821bad0590fbb9d5779e7caa6e1cc4978e7eb24f
+    iniconfig==2.0.0 \
+        --hash=sha256:2d91e135bf72d31a410b17c16da610a82cb55f6b0477d1a902134b24a455b8b3 \
+        --hash=sha256:b6a85871a79d2e3b22d2d1b94ac2824226a63c6b741c88f7ae975f18b6778374
+    sniffio==1.3.1 \
+        --hash=sha256:f4324edc670a0f49750a81b895f35c3adb843cca46f0530f79fc1babb23789dc \
+        --hash=sha256:2f6da418d1f1e0fddd844478f41680e794e6051915791a034ff65e5f100525a2
+
+    ----- stderr -----
+    Resolved 6 packages in [TIME]
+    "###);
+
+    // Exclude `project`.
+    uv_snapshot!(context.filters(), context.export().arg("--no-emit-project"), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+    # This file was autogenerated via `uv export`.
+    -e child
+    anyio==3.7.0 \
+        --hash=sha256:275d9973793619a5374e1c89a4f4ad3f4b0a5510a2b5b939444bee8f4c4d37ce \
+        --hash=sha256:eddca883c4175f14df8aedce21054bfca3adb70ffe76a9f607aef9d7fa2ea7f0
+    idna==3.6 \
+        --hash=sha256:9ecdbbd083b06798ae1e86adcbfe8ab1479cf864e4ee30fe4e46a003d12491ca \
+        --hash=sha256:c05567e9c24a6b9faaa835c4821bad0590fbb9d5779e7caa6e1cc4978e7eb24f
+    iniconfig==2.0.0 \
+        --hash=sha256:2d91e135bf72d31a410b17c16da610a82cb55f6b0477d1a902134b24a455b8b3 \
+        --hash=sha256:b6a85871a79d2e3b22d2d1b94ac2824226a63c6b741c88f7ae975f18b6778374
+    sniffio==1.3.1 \
+        --hash=sha256:f4324edc670a0f49750a81b895f35c3adb843cca46f0530f79fc1babb23789dc \
+        --hash=sha256:2f6da418d1f1e0fddd844478f41680e794e6051915791a034ff65e5f100525a2
+
+    ----- stderr -----
+    Resolved 6 packages in [TIME]
+    "###);
+
+    // Exclude `child`.
+    uv_snapshot!(context.filters(), context.export().arg("--no-emit-project").arg("--package").arg("child"), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+    # This file was autogenerated via `uv export`.
+    iniconfig==2.0.0 \
+        --hash=sha256:2d91e135bf72d31a410b17c16da610a82cb55f6b0477d1a902134b24a455b8b3 \
+        --hash=sha256:b6a85871a79d2e3b22d2d1b94ac2824226a63c6b741c88f7ae975f18b6778374
+
+    ----- stderr -----
+    Resolved 6 packages in [TIME]
+    "###);
+
+    // Exclude the workspace.
+    uv_snapshot!(context.filters(), context.export().arg("--no-emit-workspace"), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+    # This file was autogenerated via `uv export`.
+    anyio==3.7.0 \
+        --hash=sha256:275d9973793619a5374e1c89a4f4ad3f4b0a5510a2b5b939444bee8f4c4d37ce \
+        --hash=sha256:eddca883c4175f14df8aedce21054bfca3adb70ffe76a9f607aef9d7fa2ea7f0
+    idna==3.6 \
+        --hash=sha256:9ecdbbd083b06798ae1e86adcbfe8ab1479cf864e4ee30fe4e46a003d12491ca \
+        --hash=sha256:c05567e9c24a6b9faaa835c4821bad0590fbb9d5779e7caa6e1cc4978e7eb24f
+    iniconfig==2.0.0 \
+        --hash=sha256:2d91e135bf72d31a410b17c16da610a82cb55f6b0477d1a902134b24a455b8b3 \
+        --hash=sha256:b6a85871a79d2e3b22d2d1b94ac2824226a63c6b741c88f7ae975f18b6778374
+    sniffio==1.3.1 \
+        --hash=sha256:f4324edc670a0f49750a81b895f35c3adb843cca46f0530f79fc1babb23789dc \
+        --hash=sha256:2f6da418d1f1e0fddd844478f41680e794e6051915791a034ff65e5f100525a2
+
+    ----- stderr -----
+    Resolved 6 packages in [TIME]
+    "###);
+
+    Ok(())
+}

docs/reference/cli.md

@@ -1857,6 +1857,18 @@ uv export [OPTIONS]
 <p>May also be set with the <code>UV_NO_CONFIG</code> environment variable.</p>
 </dd><dt><code>--no-dev</code></dt><dd><p>Omit development dependencies</p>
 
+</dd><dt><code>--no-emit-package</code> <i>no-emit-package</i></dt><dd><p>Do not emit the given package(s).</p>
+
+<p>By default, all of the project&#8217;s dependencies are included in the exported requirements file. The <code>--no-install-package</code> option allows exclusion of specific packages.</p>
+
+</dd><dt><code>--no-emit-project</code></dt><dd><p>Do not emit the current project.</p>
+
+<p>By default, the current project is included in the exported requirements file with all of its dependencies. The <code>--no-emit-project</code> option allows the project to be excluded, but all of its dependencies to remain included.</p>
+
+</dd><dt><code>--no-emit-workspace</code></dt><dd><p>Do not emit any workspace members, including the root project.</p>
+
+<p>By default, all workspace members and their dependencies are included in the exported requirements file, with all of their dependencies. The <code>--no-emit-workspace</code> option allows exclusion of all the workspace members while retaining their dependencies.</p>
+
 </dd><dt><code>--no-hashes</code></dt><dd><p>Omit hashes in the generated output</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>