Smart File Writer Skill for Claude

import os
# Check path length (Windows: 260 char limit)
if len(filepath) > 260 and os.name == 'nt':
    print(f"Path too long: {len(filepath)} chars")

# Check parent directory exists
parent = os.path.dirname(filepath)
if not os.path.exists(parent):
    print(f"Parent directory missing: {parent}")

import os
# Check directory write permission
parent = os.path.dirname(filepath) or '.'
if not os.access(parent, os.W_OK):
    print(f"No write permission: {parent}")

# Check file permissions if exists
if os.path.exists(filepath):
    if not os.access(filepath, os.W_OK):
        print(f"File not writable: {filepath}")

import shutil
# Check available disk space
stat = shutil.disk_usage(os.path.dirname(filepath) or '.')
free_gb = stat.free / (1024**3)
if free_gb < 0.1:  # Less than 100MB
    print(f"Low disk space: {free_gb:.2f} GB free")

import os
# Try to open with exclusive access
try:
    with open(filepath, 'a') as f:
        pass
except PermissionError:
    print(f"File locked by another process: {filepath}")

# Check if file is in use (Windows)
handle.exe -a "filepath"

# Check file attributes
attrib "filepath"

import os
os.makedirs(os.path.dirname(filepath), exist_ok=True)

import os
import tempfile

# Write to temp file first
temp_fd, temp_path = tempfile.mkstemp(dir=os.path.dirname(filepath))
try:
    with os.fdopen(temp_fd, 'w') as f:
        f.write(content)
    # Atomic rename
    os.replace(temp_path, filepath)
except Exception as e:
    os.unlink(temp_path)
    raise

import time

def write_with_retry(filepath, content, max_retries=3):
    for attempt in range(max_retries):
        try:
            with open(filepath, 'w') as f:
                f.write(content)
            return True
        except (PermissionError, OSError) as e:
            if attempt < max_retries - 1:
                wait = 2 ** attempt  # 1s, 2s, 4s
                time.sleep(wait)
            else:
                raise

import os
import hashlib

def shorten_path(long_path):
    """Use hash for long filenames"""
    dir_path = os.path.dirname(long_path)
    filename = os.path.basename(long_path)

    if len(long_path) > 260:
        # Hash the filename
        name, ext = os.path.splitext(filename)
        hash_name = hashlib.md5(name.encode()).hexdigest()[:16]
        return os.path.join(dir_path, f"{hash_name}{ext}")
    return long_path

# Linux/Mac: Add write permission
chmod u+w filepath

# Windows: Remove read-only attribute
attrib -r filepath

# Windows: Take ownership (admin required)
takeown /f filepath
icacls filepath /grant %username%:F

import time
import os

def is_antivirus_blocking(filepath):
    """Detect if antivirus is scanning file"""
    try:
        # Try to open exclusively
        with open(filepath, 'r+b') as f:
            pass
        return False
    except PermissionError:
        # Wait and retry
        time.sleep(0.5)
        try:
            with open(filepath, 'r+b') as f:
                pass
            return True  # Was temporarily blocked
        except:
            return False  # Persistent block

def validate_write_conditions(filepath):
    """Run before writing important files"""
    issues = []

    # 1. Path length
    if len(filepath) > 260 and os.name == 'nt':
        issues.append(f"Path too long: {len(filepath)} chars")

    # 2. Parent directory
    parent = os.path.dirname(filepath) or '.'
    if not os.path.exists(parent):
        issues.append(f"Parent missing: {parent}")
    elif not os.access(parent, os.W_OK):
        issues.append(f"No write permission: {parent}")

    # 3. Disk space
    stat = shutil.disk_usage(parent)
    if stat.free < 100 * 1024 * 1024:  # 100MB
        issues.append(f"Low disk space: {stat.free / 1024**2:.1f} MB")

    # 4. File exists and writable
    if os.path.exists(filepath):
        if not os.access(filepath, os.W_OK):
            issues.append(f"File not writable: {filepath}")

    return issues

# Before using Write tool, validate:
issues = validate_write_conditions(target_path)
if issues:
    print("Pre-write validation failed:")
    for issue in issues:
        print(f"  - {issue}")
    # Take corrective action
else:
    # Proceed with Write tool

# Before editing, check file is writable
if not os.access(filepath, os.W_OK):
    print(f"Cannot edit: {filepath} is read-only")
    # Suggest: chmod u+w or attrib -r

# Before redirecting output
if [ ! -w "$(dirname "$output_file")" ]; then
    echo "Cannot write to directory"
    exit 1
fi

Diagnosis: Parent directory 'results' does not exist
Resolution: Created directory 'results'
Retry: torch.save() succeeded

Warning: Path length 285 chars exceeds Windows limit (260)
Alternative: D:\very\long\path\...\a3f5e8b2c1d4.csv
Mapping saved to: path_mappings.json
Write succeeded to alternative path

Diagnosis: File 'data.csv' has read-only attribute
Resolution: Run 'attrib -r data.csv' to remove read-only flag
[After user confirmation]
Attribute removed. Retry succeeded.

Diagnosis: File 'report.xlsx' is locked by another process
Likely cause: File is open in Microsoft Excel
Resolution options:
  1. Close Excel and retry
  2. Write to alternative: 'report_new.xlsx'
  3. Use atomic write with temp file
Cannot proceed automatically. User action required.

Warning: Insufficient disk space
Required: ~2.0 GB
Available: 0.5 GB
Recommendations:
  1. Clean up temporary files
  2. Write to alternative drive: E:\
  3. Compress checkpoint before saving
Write operation blocked to prevent failure.