Fix #109 — “Error loading document: Found multiple competing main tex files”

[bikramkhastgir]

Issue: Addressing #109: Error loading document: Found multiple competing main tex files

This PR enhances the find_main_tex_file function in functions/import_pipeline/latex_utils.py to handle a few more edge cases to identify the master document in multi-file LaTeX projects.

Fix Description:

• Rule 1 kept unchanged. Modified valid_main_path to contain the file content along with the path as a nested list to avoid having to reread the files.
• Added a couple more rule-based heuristics.
  • Rule 2: Check for \input or \include as that is an indicator of a main file. In case, multiple such files are found,
  • Rule 3: exclude files using classes typically for figures or parts (e.g. 'standalone', 'tikz').
• If still no file or multiple files are returned, to raise ValueError (as per the original logic)
• Added sets of exclude and include constants for future enhancements.
• Changed return type and logic to handle nested lists.

Test Data Example:
Arxiv repositories containing multiple .tex files with and without a naming convention (main.tex)

1. https://arxiv.org/abs/2510.14090v1 - Quantum Low-Density Parity-Check Codes
2. https://arxiv.org/abs/2412.15163 - Operationalising Rawlsian Ethics for Fairness in Norm-Learning Agents
3. https://arxiv.org/abs/2511.10409 - Explaining Decentralized Multi-Agent Reinforcement Learning Policies
4. https://arxiv.org/abs/2511.09724 - PALMS+: Modular Image-Based Floor Plan Localization Leveraging Depth Foundation Model (has main.tex along with multiple .tex files)

Changes:
File located at: functions/import_pipeline/latex_utils.py
The constants and the enhanced find_main_tex_file function have been modified in the file.