Improve package fetching duration by using the 'pip inspect' command.

Author: nnitch

.gitignore

@@ -2,4 +2,5 @@ venv/
 *.pyc
 */__pycache__
 *.egg-info
-dist/
+dist/
+build/

pyproject.toml

@@ -27,11 +27,12 @@ classifiers = [
     "Operating System :: OS Independent",
 ]
 dependencies = [
-    "setuptools>=61.0"
+    "setuptools>=61.0",
+    "pip>=22.2"
 ]
 
 [tool.setuptools_scm]
 
 [project.urls]
-"Homepage" = "http://github.com/mitch0s/pipslim"
+"GitHub" = "http://github.com/mitch0s/pipslim"
 "Bug Tracker" = "https://github.com/mitch0s/pipslim/issues"

src/pipslim/__init__.py

@@ -1,25 +1,13 @@
+#
+# pipslim - created by Mitch Naake (mitch0s)
+#
 from .util import *
-import threading
 
 def run():
     """
-    Program entry point
+    Print list of user-installed packages in pip freeze format.
     """
-    packages = []
-    def _threaded_list_package_deps(package:dict=None):
-        if package == None : return
-        if len(list_package_dependencies(package['name'])) == 0:
-            packages.append(f"{package['name']}=={package['version']}")
-
-    threads = []
-    for package in list_packages():
-        thread = threading.Thread(target=lambda: _threaded_list_package_deps(package), daemon=True)
-        threads.append(thread)
-        thread.start()
-
-    for thread in threads: thread.join()
-    
-    print('\n'.join(sorted(packages)))
+    print('\n'.join(util.list_user_installed_packages()))
 
 if __name__ == '__main__':
     run()

src/pipslim/util.py

@@ -1,8 +1,11 @@
 
 import sys
+import os
 import subprocess
 import json
 
+os.environ['PYTHONUTF8'] = '1'
+
 def in_venv():
     # Check for sys.real_prefix for older virtualenv compatibility
     if hasattr(sys, 'real_prefix'):
@@ -18,9 +21,9 @@ def list_packages() -> list[dict]:
     return json.loads(result.stdout)
 
 
-def list_package_dependencies(package:str=None) -> list[dict]:
+def list_package_dependents(package:str=None) -> list[dict]:
     """
-    returns a list of higher-order packages that depend on this package.
+    List what packages depend on the target package.
     """
     result = subprocess.run(['pip', 'show', package], capture_output=True, text=True).stdout
     for line in result.split('\n'):
@@ -29,4 +32,19 @@ def list_package_dependencies(package:str=None) -> list[dict]:
             line = line.replace('Required-by:', '')
             deps = list(filter(lambda dep: dep != '', line.split(',')))
             return deps
-    return []            
+    return []            
+
+
+def list_user_installed_packages() -> list[str]:
+    _packages = []
+
+    result = subprocess.run(['pip', 'inspect', '--no-color'], capture_output=True, text=True, errors='ignore')
+    pinfo = json.loads(result.stdout)
+
+    for package in pinfo['installed']:
+        if package['requested'] == True:
+            package_name = package['metadata']['name']
+            package_version = package['metadata']['version']
+            _packages.append(f'{package_name}=={package_version}')
+
+    return sorted(_packages, key=str.lower)