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"""
Shared utilities for Diffron.
Provides common functions for port scanning, Git operations, and file handling.
"""
import subprocess
import socket
from typing import List, Optional
import psutil
COMMON_PORTS = [8000, 8001, 8080, 8081, 5000, 5001]
def scan_ports(ports: Optional[List[int]] = None, host: str = "localhost") -> List[int]:
"""
Scan for open ports on the given host.
Args:
ports: List of ports to scan. Defaults to COMMON_PORTS.
host: Host to scan. Defaults to localhost.
Returns:
List of open ports.
"""
if ports is None:
ports = COMMON_PORTS
open_ports = []
for port in ports:
if is_port_open(host, port):
open_ports.append(port)
return open_ports
def is_port_open(host: str, port: int, timeout: float = 1.0) -> bool:
"""
Check if a port is open on the given host.
Args:
host: Host to check.
port: Port number to check.
timeout: Connection timeout in seconds.
Returns:
True if port is open, False otherwise.
"""
try:
with socket.create_connection((host, port), timeout=timeout):
return True
except (socket.timeout, ConnectionRefusedError, OSError):
return False
def get_staged_diff(max_chars: int = 4000) -> str:
"""
Get the staged git diff.
Args:
max_chars: Maximum number of characters to return.
Returns:
Staged diff as string, truncated to max_chars.
"""
try:
result = subprocess.run(
["git", "diff", "--cached"],
capture_output=True,
text=True,
errors="ignore",
timeout=30,
)
diff = result.stdout[:max_chars]
return diff
except (subprocess.SubprocessError, FileNotFoundError):
return ""
def get_branch_diff(branch: str, base: str = "main", max_chars: int = 5000) -> str:
"""
Get the diff between a branch and its base.
Args:
branch: Branch name to compare.
base: Base branch to compare against.
max_chars: Maximum number of characters to return.
Returns:
Diff as string, truncated to max_chars.
"""
try:
result = subprocess.run(
["git", "diff", f"{base}..{branch}"],
capture_output=True,
text=True,
errors="ignore",
timeout=30,
)
diff = result.stdout[:max_chars]
return diff
except (subprocess.SubprocessError, FileNotFoundError):
return ""
def get_commit_log(branch: str, base: str = "main") -> str:
"""
Get the commit log between a branch and its base.
Args:
branch: Branch name.
base: Base branch.
Returns:
Commit log as string (oneline format).
"""
try:
result = subprocess.run(
["git", "log", "--oneline", f"{base}..{branch}"],
capture_output=True,
text=True,
errors="ignore",
timeout=30,
)
return result.stdout
except (subprocess.SubprocessError, FileNotFoundError):
return ""
def get_current_branch() -> Optional[str]:
"""
Get the current git branch name.
Returns:
Branch name or None if not in a git repo.
"""
try:
result = subprocess.run(
["git", "symbolic-ref", "--short", "HEAD"],
capture_output=True,
text=True,
errors="ignore",
timeout=10,
)
if result.returncode == 0:
return result.stdout.strip()
except (subprocess.SubprocessError, FileNotFoundError):
pass
return None
def is_git_repo(path: str = ".") -> bool:
"""
Check if the given path is inside a git repository.
Args:
path: Path to check.
Returns:
True if inside a git repo, False otherwise.
"""
try:
result = subprocess.run(
["git", "rev-parse", "--git-dir"],
capture_output=True,
text=True,
cwd=path,
timeout=10,
)
return result.returncode == 0
except (subprocess.SubprocessError, FileNotFoundError):
return False
def get_git_dir(path: str = ".") -> Optional[str]:
"""
Get the .git directory path.
Args:
path: Path to check.
Returns:
Absolute path to .git directory or None.
"""
try:
result = subprocess.run(
["git", "rev-parse", "--git-dir"],
capture_output=True,
text=True,
cwd=path,
timeout=10,
)
if result.returncode == 0:
git_dir = result.stdout.strip()
# Convert to absolute path
import os
if not os.path.isabs(git_dir):
git_dir = os.path.abspath(os.path.join(path, git_dir))
return git_dir
except (subprocess.SubprocessError, FileNotFoundError):
pass
return None
def find_default_branch() -> str:
"""
Find the default branch (main or master).
Returns:
Default branch name.
"""
try:
# Try main first (modern default)
result = subprocess.run(
["git", "rev-parse", "--verify", "main"],
capture_output=True,
text=True,
timeout=10,
)
if result.returncode == 0:
return "main"
# Fall back to master
result = subprocess.run(
["git", "rev-parse", "--verify", "master"],
capture_output=True,
text=True,
timeout=10,
)
if result.returncode == 0:
return "master"
except (subprocess.SubprocessError, FileNotFoundError):
pass
return "main" # Default to main