feat: Remove dependency of pip (#1268)

news/1268.dep.md

+Remove the dependency of `pip`.

pdm/cli/commands/plugin.py

 from __future__ import annotations
 
 import argparse
-import os
 import shlex
 import subprocess
 import sys
 
-from pip import __file__ as pip_location
-
 from pdm import termui
 from pdm.cli.commands.base import BaseCommand
 from pdm.cli.options import verbose_option
 from pdm.cli.utils import Package, build_dependency_graph
 from pdm.compat import importlib_metadata
-from pdm.models.environment import WorkingSet
+from pdm.models.environment import BareEnvironment, WorkingSet
 from pdm.project import Project
 from pdm.utils import normalize_name
 
@@ -26,11 +23,10 @@ def _all_plugins() -> list[str]:
     return sorted(result)
 
 
-def run_pip(args: list[str]) -> bytes:
-    return subprocess.check_output(
-        [sys.executable, "-I", os.path.dirname(pip_location)] + args,
-        stderr=subprocess.STDOUT,
-    )
+def run_pip(project: Project, args: list[str]) -> bytes:
+    env = BareEnvironment(project)
+    project.environment = env
+    return subprocess.check_output(env.pip_command + args, stderr=subprocess.STDOUT)
 
 
 class Command(BaseCommand):
@@ -101,7 +97,7 @@ class AddCommand(BaseCommand):
             with project.core.ui.open_spinner(
                 f"Installing plugins: {options.packages}"
             ):
-                run_pip(pip_args)
+                run_pip(project, pip_args)
         except subprocess.CalledProcessError as e:
             project.core.ui.echo(
                 "Installation failed: \n" + e.output.decode("utf8"), err=True
@@ -182,7 +178,7 @@ class RemoveCommand(BaseCommand):
             with project.core.ui.open_spinner(
                 f"Uninstalling plugins: {valid_packages}"
             ):
-                run_pip(pip_args)
+                run_pip(project, pip_args)
         except subprocess.CalledProcessError as e:
             project.core.ui.echo(
                 "Uninstallation failed: \n" + e.output.decode("utf8"), err=True

pyproject.toml

@@ -9,7 +9,6 @@ requires-python = ">=3.7"
 license = {text = "MIT"}
 dependencies = [
     "blinker",
-    "pip>=20",
     "packaging",
     "platformdirs",
     "rich>=12.3.0",

tests/cli/test_plugin.py

-from unittest.mock import Mock
+from unittest.mock import ANY, Mock
 
 import pytest
 
@@ -34,13 +34,15 @@ def test_plugin_list(invoke):
 def test_plugin_add(invoke, mock_pip):
     result = invoke(["plugin", "add", "foo"])
     assert result.exit_code == 0, result.stderr
-    mock_pip.assert_called_with(["install", "foo"])
+    mock_pip.assert_called_with(ANY, ["install", "foo"])
 
     result = invoke(
         ["plugin", "add", "--pip-args", "--force-reinstall --upgrade", "foo"]
     )
     assert result.exit_code == 0, result.stderr
-    mock_pip.assert_called_with(["install", "--force-reinstall", "--upgrade", "foo"])
+    mock_pip.assert_called_with(
+        ANY, ["install", "--force-reinstall", "--upgrade", "foo"]
+    )
 
 
 @pytest.mark.usefixtures("mock_all_plugins")
@@ -59,4 +61,4 @@ def test_plugin_remove(invoke, mock_pip, monkeypatch):
 
     result = invoke(["plugin", "remove", "-y", "demo"])
     assert result.exit_code == 0, result.stderr
-    mock_pip.assert_called_with(["uninstall", "-y", "demo", "pytz"])
+    mock_pip.assert_called_with(ANY, ["uninstall", "-y", "demo", "pytz"])