Modify pip list and tree to print to stdout regardless of the --quiet flag (#8392)

## Summary

The desired behavior for `uv tree` and `uv pip list` with `-q | --quiet`
flag is
https://github.com/astral-sh/uv/issues/8379#issuecomment-2425093709 to
still produce output. This is implemented here.

Closes https://github.com/astral-sh/uv/issues/8379

## Test Plan

Use `uv tree -q` or `uv pip list -q` on any uv project setup and expect
the corresponding output.
Added tests for that as well.

---------

Co-authored-by: Charlie Marsh <charlie.r.marsh@gmail.com>

crates/uv/src/commands/pip/list.rs

@@ -1,6 +1,7 @@
 use std::cmp::max;
 use std::fmt::Write;
 
+use anstream::println;
 use anyhow::Result;
 use itertools::Itertools;
 use owo_colors::OwoColorize;
@@ -56,7 +57,7 @@ pub(crate) fn pip_list(
         ListFormat::Json => {
             let rows = results.iter().copied().map(Entry::from).collect_vec();
             let output = serde_json::to_string(&rows)?;
-            writeln!(printer.stdout(), "{output}")?;
+            println!("{output}");
         }
         ListFormat::Columns if results.is_empty() => {}
         ListFormat::Columns => {
@@ -97,18 +98,13 @@ pub(crate) fn pip_list(
             }
 
             for elems in MultiZip(columns.iter().map(Column::fmt).collect_vec()) {
-                writeln!(printer.stdout(), "{}", elems.join(" ").trim_end())?;
+                println!("{}", elems.join(" ").trim_end());
             }
         }
         ListFormat::Freeze if results.is_empty() => {}
         ListFormat::Freeze => {
             for dist in &results {
-                writeln!(
+                println!("{}=={}", dist.name().bold(), dist.version());
-                    printer.stdout(),
-                    "{}=={}",
-                    dist.name().bold(),
-                    dist.version()
-                )?;
             }
         }
     }

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

@@ -1,7 +1,8 @@
-use anyhow::Result;
-use std::fmt::Write;
 use std::path::Path;
 
+use anstream::print;
+use anyhow::Result;
+
 use uv_cache::Cache;
 use uv_client::Connectivity;
 use uv_configuration::{Concurrency, DevMode, LowerBound, TargetTriple};
@@ -100,7 +101,7 @@ pub(crate) async fn tree(
         invert,
     );
 
-    write!(printer.stdout(), "{tree}")?;
+    print!("{tree}");
 
     Ok(ExitStatus::Success)
 }

crates/uv/tests/it/pip_list.rs

@@ -525,3 +525,77 @@ Version: 0.1-bulbasaur
 
     Ok(())
 }
+
+#[test]
+fn list_ignores_quiet_flag_format_freeze() {
+    let context = TestContext::new("3.12");
+
+    // Install the editable package.
+    uv_snapshot!(context.filters(), context
+        .pip_install()
+        .arg("-e")
+        .arg(context.workspace_root.join("scripts/packages/poetry_editable")), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+
+    ----- stderr -----
+    Resolved 4 packages in [TIME]
+    Prepared 4 packages in [TIME]
+    Installed 4 packages in [TIME]
+     + anyio==4.3.0
+     + idna==3.6
+     + poetry-editable==0.1.0 (from file://[WORKSPACE]/scripts/packages/poetry_editable)
+     + sniffio==1.3.1
+    "###
+    );
+
+    let filters = context
+        .filters()
+        .into_iter()
+        .chain(vec![(r"\-\-\-\-\-\-+.*", "[UNDERLINE]"), ("  +", " ")])
+        .collect::<Vec<_>>();
+
+    uv_snapshot!(filters, context.pip_list()
+    .arg("--format=freeze")
+    .arg("--quiet"), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+    anyio==4.3.0
+    idna==3.6
+    poetry-editable==0.1.0
+    sniffio==1.3.1
+
+    ----- stderr -----
+    "###
+    );
+
+    uv_snapshot!(filters, context.pip_list()
+    .arg("--format=freeze")
+    .arg("--editable")
+    .arg("--quiet"), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+    poetry-editable==0.1.0
+
+    ----- stderr -----
+    "###
+    );
+
+    uv_snapshot!(filters, context.pip_list()
+    .arg("--format=freeze")
+    .arg("--exclude-editable")
+    .arg("--quiet"), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+    anyio==4.3.0
+    idna==3.6
+    sniffio==1.3.1
+
+    ----- stderr -----
+    "###
+    );
+}

crates/uv/tests/it/pip_tree.rs

@@ -1744,3 +1744,42 @@ fn show_version_specifiers_with_package() {
     "###
     );
 }
+
+#[test]
+fn print_output_even_with_quite_flag() {
+    let context = TestContext::new("3.12");
+
+    let requirements_txt = context.temp_dir.child("requirements.txt");
+    requirements_txt.write_str("requests==2.31.0").unwrap();
+
+    uv_snapshot!(context
+        .pip_install()
+        .arg("-r")
+        .arg("requirements.txt")
+        .arg("--strict"), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+
+    ----- stderr -----
+    Resolved 5 packages in [TIME]
+    Prepared 5 packages in [TIME]
+    Installed 5 packages in [TIME]
+     + certifi==2024.2.2
+     + charset-normalizer==3.3.2
+     + idna==3.6
+     + requests==2.31.0
+     + urllib3==2.2.1
+    "###
+    );
+
+    context.assert_command("import requests").success();
+    uv_snapshot!(context.filters(), context.pip_tree().arg("--quiet"), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+
+    ----- stderr -----
+    "###
+    );
+}