Modernize Python packaging using uv and pyproject.toml

.gitignore

@@ -1,6 +1,54 @@
+# Python
 *.pyc
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+
+# Virtual environments
+.venv/
+venv/
+ENV/
+env/
+
+# Testing
+.pytest_cache/
+.coverage
+htmlcov/
+.tox/
+
+# Distribution / packaging
+*.egg
+*.egg-info/
+dist/
+build/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+
+# Project specific
 .scripts/
 logs/
 .qbatch/
-.eggs/
-qbatch.egg-info/
+
+# uv
+uv.lock
+.python-version
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db

CLAUDE.md

@@ -0,0 +1,123 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Overview
+
+qbatch is a command-line tool and Python library for executing shell commands in parallel on high-performance computing clusters. It abstracts differences between various job schedulers (PBS/Torque, SGE, Slurm) and provides a unified interface for submitting batch jobs.
+
+## Common Development Commands
+
+### Testing
+```bash
+# Run all tests
+nosetests test/test_qbatch.py
+
+# Run a specific test
+nosetests test/test_qbatch.py:test_run_qbatch_local_piped_commands
+
+# Run with verbose output
+nosetests -v test/test_qbatch.py
+```
+
+### Building
+```bash
+# Build source distribution and wheel
+python setup.py sdist bdist_wheel
+
+# Build for local testing
+pip install -e .
+```
+
+### Installation
+```bash
+# Install from source
+pip install .
+
+# Install with testing dependencies
+pip install -r requirements-testing.txt
+```
+
+## Architecture
+
+### Core Components
+
+The codebase is intentionally simple, with all logic contained in a single main file:
+
+- **qbatch/qbatch.py** (777 lines): Contains all functionality
+- **qbatch/__init__.py**: Package exports
+
+### Key Functions
+
+**`qbatchParser(args=None)`** (line 645-772)
+- Argument parser using argparse
+- Parses command-line options and environment variables
+- Calls `qbatchDriver()` with parsed arguments
+
+**`qbatchDriver(**kwargs)`** (line 341-642)
+- Main driver function that orchestrates job submission
+- Accepts either a command file or a `task_list` (list of command strings)
+- Generates job scripts based on the selected scheduler system
+- Supports "chunking" commands into groups, each running in parallel via GNU parallel
+
+**System-specific functions:**
+- `pbs_find_jobs(patterns)` (line 238-285): Finds PBS/Torque jobs using qstat XML output
+- `slurm_find_jobs(patterns)` (line 288-317): Finds Slurm jobs using squeue
+- `compute_threads(ppj, ncores)` (line 228-235): Calculates threads per command
+
+### Templates (lines 76-155)
+
+The system uses template strings for generating job scheduler headers:
+- `PBS_HEADER_TEMPLATE`: PBS/Torque job scripts
+- `SGE_HEADER_TEMPLATE`: Grid Engine job scripts
+- `SLURM_HEADER_TEMPLATE`: Slurm job scripts
+- `LOCAL_TEMPLATE`: Local execution using GNU parallel
+- `CONTAINER_TEMPLATE`: For containerized environments
+
+### Environment Variables
+
+All defaults can be overridden via environment variables (prefix `QBATCH_`):
+- `QBATCH_SYSTEM`: Scheduler type (pbs, sge, slurm, local, container)
+- `QBATCH_PPJ`: Processors per job
+- `QBATCH_CHUNKSIZE`: Commands per job chunk
+- `QBATCH_CORES`: Parallel commands per job
+- `QBATCH_MEM`: Memory request
+- `QBATCH_QUEUE`: Queue name
+- `QBATCH_SCRIPT_FOLDER`: Where to write generated scripts (default: `.qbatch/`)
+
+### Key Concepts
+
+**Chunking**: Commands are divided into chunks (controlled by `-c`). Each chunk becomes one job submission. Within a job, commands run in parallel using GNU parallel (controlled by `-j`).
+
+**Array vs Individual Jobs**: By default, qbatch creates array jobs when chunks > 1. The `-i` flag submits individual jobs instead.
+
+**Job Dependencies**: The `--depend` option accepts glob patterns or job IDs to wait for before starting new jobs.
+
+**Environment Propagation**: Three modes (via `--env`):
+- `copied`: Exports current environment variables into job script
+- `batch`: Uses scheduler's native environment propagation (-V, --export=ALL)
+- `none`: No environment propagation
+
+## Testing Notes
+
+Tests use `nosetests` and rely on:
+- Setting `QBATCH_SCRIPT_FOLDER` to a temp directory
+- Testing dry-run mode (`-n`) to avoid actual job submission
+- Simulating scheduler environment variables (e.g., `SGE_TASK_ID`, `PBS_ARRAYID`)
+- Using Python 2/3 compatibility via `future` library
+
+Tests are integration-style, generating actual job scripts and verifying they produce expected output when executed.
+
+## Python 2/3 Compatibility
+
+The codebase maintains Python 2.7+ compatibility using:
+- `future` library for standard library aliases
+- Custom `_EnvironDict` class for UTF-8 environment variable handling on Python 2
+- `io.open()` for UTF-8 file handling
+- Careful string/unicode handling
+
+## Version Management
+
+- Version is defined in `setup.py` (line 14)
+- Uses `importlib.metadata` for version retrieval at runtime (line 9)
+- GitHub Actions workflow publishes releases to PyPI when a release is created

pyproject.toml

@@ -0,0 +1,81 @@
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[project]
+name = "qbatch"
+version = "2.3.1"
+description = "Execute shell command lines in parallel on Slurm, SGE and PBS/Torque clusters"
+readme = "README.md"
+license = { text = "Unlicense" }
+requires-python = ">=3.8"
+authors = [
+    { name = "Jon Pipitone", email = "jon@pipitone.ca" },
+    { name = "Gabriel A. Devenyi", email = "gdevenyi@gmail.com" },
+]
+maintainers = [
+    { name = "Jon Pipitone", email = "jon@pipitone.ca" },
+    { name = "Gabriel A. Devenyi", email = "gdevenyi@gmail.com" },
+]
+keywords = [
+    "hpc",
+    "batch",
+    "cluster",
+    "slurm",
+    "sge",
+    "pbs",
+    "torque",
+    "parallel",
+]
+classifiers = [
+    "Development Status :: 5 - Production/Stable",
+    "Environment :: Console",
+    "Intended Audience :: Science/Research",
+    "License :: Public Domain",
+    "Natural Language :: English",
+    "Operating System :: POSIX :: Linux",
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.8",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
+    "Topic :: System :: Clustering",
+    "Topic :: System :: Distributed Computing",
+    "Topic :: Utilities",
+]
+dependencies = []
+
+[project.optional-dependencies]
+testing = [
+    "nose>=1.0",
+    "ushlex",
+]
+
+[project.scripts]
+qbatch = "qbatch:qbatchParser"
+
+[project.urls]
+Homepage = "https://github.com/pipitone/qbatch"
+Repository = "https://github.com/pipitone/qbatch"
+Issues = "https://github.com/pipitone/qbatch/issues"
+
+[dependency-groups]
+dev = []
+testing = [
+    "pytest>=7.0",
+    "pytest-cov>=4.0",
+]
+
+[tool.hatch.build.targets.wheel]
+packages = ["qbatch"]
+
+[tool.hatch.build.targets.sdist]
+include = [
+    "/qbatch",
+    "/test",
+    "/README.md",
+    "/LICENSE",
+    "/CLAUDE.md",
+]

qbatch/__init__.py

@@ -1,5 +1,3 @@
-from __future__ import absolute_import
-
 from . import qbatch
 from .qbatch import qbatchParser
 from .qbatch import qbatchDriver

qbatch/qbatch.py

@@ -1,8 +1,4 @@
 #!/usr/bin/env python
-from __future__ import (absolute_import, division,
-                        print_function, unicode_literals)
-from builtins import *
-from future import standard_library
 import argparse
 import math
 import os
@@ -15,28 +11,6 @@
 import errno
 from io import open
 from textwrap import dedent
-standard_library.install_aliases()
-
-# Fix python2's environment to return UTF-8 encoded items
-# Stolen from https://stackoverflow.com/a/31004947/4130016
-if sys.version_info[0] < 3:
-    class _EnvironDict(dict):
-        def __getitem__(self, key):
-            return super(_EnvironDict,
-                         self).__getitem__(key.encode("utf-8")).decode("utf-8")
-
-        def __setitem__(self, key, value):
-            return super(_EnvironDict, self).__setitem__(key.encode("utf-8"),
-                                                         value.encode("utf-8"))
-
-        def get(self, key, failobj=None):
-            try:
-                return super(_EnvironDict, self).get(key.encode("utf-8"),
-                                                     failobj).decode("utf-8")
-            except AttributeError:
-                return super(_EnvironDict, self).get(key.encode("utf-8"),
-                                                     failobj)
-    os.environ = _EnvironDict(os.environ)
 
 
 def _setupVars():