Coding

Copilot Instructions

This project appears to be focused on PDF to EPS (Encapsulated PostScript) conversion.

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Feb 7, 2026

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Copilot Instructions

Project Context

This project appears to be focused on PDF to EPS (Encapsulated PostScript) conversion.

It is to be run under CUPSD on an Ubuntu linux server to share a Epson TM-T20II receipt printer over AirPrint. Since AirPrint only supports PDF, and the Epson printer only supports EPS, this project converts PDF files to EPS files for printing. it adds the Epson specific commands to control the printer for things such as cutting the paper after printing a receipt, and wraps lines.

It has a test interface to be able to run it outcside of CUPSD for testing and development. Feed in a PDF, get out an EPS.

Code Style and Preferences

Use clear, descriptive variable and function names
Add comments for complex logic and algorithms
Follow consistent indentation and formatting
Prefer explicit error handling over silent failures

Language-Specific Guidelines

Python (if applicable)

Follow PEP 8 style guidelines
Use type hints where appropriate
Prefer f-strings for string formatting
Use list comprehensions for simple transformations

JavaScript/TypeScript (if applicable)

Use const/let instead of var
Prefer arrow functions for simple operations
Use async/await over .then() chains
Add JSDoc comments for functions

Project-Specific Guidelines

When working with PDF operations, always handle file I/O errors gracefully
Consider memory usage when processing large PDF files
Include appropriate error messages for file format validation
Test with various PDF types and sizes

Documentation

Include README updates for new features
Document API changes and breaking changes
Add inline comments for complex conversion algorithms
Include usage examples for new functionality

Testing

Write unit tests for core conversion functions
Include integration tests for file I/O operations
Test edge cases like empty files, corrupted PDFs, etc.
Verify output quality and format compliance

Security Considerations

Validate input file types and sizes
Sanitize file paths to prevent directory traversal
Handle potentially malicious PDF content safely
Don't expose sensitive file system information in error messages