⚡️ Speed up function _apply_diff_with_subprocess by 22%

[codeflash-ai]

📄 22% (0.22x) speedup for _apply_diff_with_subprocess in openhands/resolver/patching/apply.py

⏱️ Runtime : 5.36 milliseconds → 4.39 milliseconds (best of 244 runs)

📝 Explanation and details

Key Changes.

1. Resource Management with ExitStack: Utilized contextlib.ExitStack() for better management of multiple open files, ensuring they are properly closed.
2. Environment Variable Access: Changed os.environ['PATH'] to os.environ.get('PATH', '') to prevent KeyError if PATH is not set.
3. Reduced Function Calls: Combined multiple remove() calls into a single call using map() for clarity.

These changes enhance the program’s efficiency by ensuring file handles are properly managed and system resource usage is minimized.

✅ Correctness verification report:

Test	Status
⚙️ Existing Unit Tests	🔘 None Found
🌀 Generated Regression Tests	✅ 5 Passed
⏪ Replay Tests	🔘 None Found
🔎 Concolic Coverage Tests	🔘 None Found
📊 Tests Coverage	93.1%

🌀 Generated Regression Tests Details

import os
import subprocess
import tempfile
from shutil import rmtree

# imports
import pytest  # used for our unit tests
from openhands.resolver.patching.apply import _apply_diff_with_subprocess
from openhands.resolver.patching.exceptions import SubprocessException
from openhands.resolver.patching.patch import diffobj
from openhands.resolver.patching.snippets import remove, which

# unit tests

class MockDiffObj:
    def __init__(self, header, text):
        self.header = header
        self.text = text


def test_simple_patch_application():
    # Test applying a simple patch that changes one line
    original_lines = ["line 1", "line 2", "line 3"]
    patch_text = """2c2
< line 2
---
> line 2 modified
"""
    diff = MockDiffObj("header", patch_text)
    expected_lines = ["line 1", "line 2 modified", "line 3"]
    result, rejections = _apply_diff_with_subprocess(diff, original_lines)


def test_reverse_patch_application():
    # Test applying a reverse patch that undoes a change
    original_lines = ["line 1", "line 2 modified", "line 3"]
    patch_text = """2c2
< line 2
---
> line 2 modified
"""
    diff = MockDiffObj("header", patch_text)
    expected_lines = ["line 1", "line 2", "line 3"]
    result, rejections = _apply_diff_with_subprocess(diff, original_lines, reverse=True)



def test_empty_lines():
    # Test applying a patch to an empty list of lines
    original_lines = []
    patch_text = """1a1
> line 1
"""
    diff = MockDiffObj("header", patch_text)
    expected_lines = ["line 1"]
    result, rejections = _apply_diff_with_subprocess(diff, original_lines)


def test_large_file_patch():
    # Test applying a patch to a large file
    original_lines = ["line {}".format(i) for i in range(1000)]
    patch_text = """500c500
< line 499
---
> line 499 modified
"""
    diff = MockDiffObj("header", patch_text)
    expected_lines = original_lines[:499] + ["line 499 modified"] + original_lines[500:]
    result, rejections = _apply_diff_with_subprocess(diff, original_lines)



def test_invalid_patch_format():
    # Test applying a patch with an invalid format
    original_lines = ["line 1", "line 2", "line 3"]
    patch_text = "invalid patch format"
    diff = MockDiffObj("header", patch_text)
    with pytest.raises(SubprocessException, match="patch program failed"):
        _apply_diff_with_subprocess(diff, original_lines)
# codeflash_output is used to check that the output of the original code is the same as that of the optimized code.

import os
import tempfile
from shutil import which

# imports
import pytest  # used for our unit tests
from openhands.resolver.patching.apply import _apply_diff_with_subprocess
from openhands.resolver.patching.exceptions import SubprocessException
from openhands.resolver.patching.patch import diffobj

# unit tests










from openhands.resolver.patching.apply import _apply_diff_with_subprocess
from openhands.resolver.patching.patch import diffobj
import pytest

def test__apply_diff_with_subprocess():
    with pytest.raises(SideEffectDetected, match='We\'ve\\ blocked\\ a\\ file\\ writing\\ operation\\ on\\ "/tmp/a52yaz6c"\\.\\ CrossHair\\ should\\ not\\ be\\ run\\ on\\ code\\ with\\ side\\ effects'):
        _apply_diff_with_subprocess(diffobj(0, '', ''), [], reverse=False)

To edit these changes git checkout codeflash/optimize-_apply_diff_with_subprocess-m8wt8by1 and push.