Paper2code for Windows

[VasileiosMalt]

Attention: If merged, I recommend a different branch, as I have made multiple changes.

What I added:

1. Multi-provider LLM support (new providers.py module)

Replaced hardcoded from openai import OpenAI with a new providers module across all pipeline scripts

Added build_client(), chat_complete(), and add_provider_args() helpers so you can pass --provider and --api_key as CLI arguments instead of relying only on OPENAI_API_KEY env var

API responses are now returned as normalized dicts instead of OpenAI SDK objects

2. Windows / PowerShell support

3.1_coding_sh.py: Changed the LLM prompt from generating a Bash script to generating a PowerShell .ps1 script for Windows

Output filename changed from reproduce.sh → reproduce.ps1

File path handling updated to use os.path.join() with backslash support instead of hardcoded forward-slash string formatting

3. UTF-8 encoding on all file I/O

Added encoding='utf-8' to every open() call across all pipeline scripts — fixes encoding errors that occur on Windows where the default encoding is often not UTF-8

4. Windows-safe file naming

File names containing / (subdirectory paths) are flattened with _ replacements before saving, avoiding path errors on Windows

Note: So far tested only openrouter (and worked perfectly)