feat(autocomplete): Add Qwen multi-file FIM template for repository-level autocompletion

[hiepau1231]

Summary

• Add qwenMultifileFimTemplate supporting repository-level autocompletion for Qwen models
• Uses <|repo_name|>, <|file_sep|> tokens for multi-file context
• Falls back to basic FIM when no snippets are provided
• Resolves issue New Qwen FIM multi file template #3589

Changes

• Added new qwenMultifileFimTemplate in core/autocomplete/templating/AutocompleteTemplate.ts
• Updated getTemplateForModel to use the new template for Qwen Coder models

Description

This PR implements the Qwen multi-file FIM template as requested in issue #3589. The template supports:

1. Repository-level context: When snippets are provided, includes repo name and file references
2. File separation: Uses <|file_sep|> token to separate multiple file contents
3. FIM tokens: Properly wraps prefix/suffix with <|fim_prefix|>, <|fim_suffix|>, <|fim_middle|> tokens
4. Backward compatibility: Falls back to basic FIM when no snippets are available

The implementation follows the pattern established by codestralMultifileFimTemplate and is based on the code snippet provided in the issue.

Testing

• Manual testing was performed by the issue author
• The template should work with any Qwen Coder model (e.g., qwen2.5-coder)

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Summary by cubic

Added a Qwen multi-file FIM template for repository-level autocompletion and set it as the default for Qwen Coder models. Falls back to basic FIM when no snippets are provided.

• New Features
  • Includes repo name and multi-file contents using <|repo_name|> and <|file_sep|>; adds repository-level separator <|system_separator_istruction_repository_level|>.
  • Computes shortest unique relative paths for snippet file references.
  • Wraps prefix/suffix with <|fim_prefix|>, <|fim_suffix|>, <|fim_middle|>, placing them after the repository separator when present; adds stop sequences for FIM and repo tokens.

^{Written for commit a8ac197. Summary will update on new commits.}

I have read the CLA Document and I hereby sign the CLA

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[cubic-dev-ai]

1 issue found across 1 file

Prompt for AI agents (all issues)

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="core/autocomplete/templating/AutocompleteTemplate.ts">

<violation number="1" location="core/autocomplete/templating/AutocompleteTemplate.ts:102">
P1: `relativePaths[i]` returns an object `{ uri, uniquePath }`, not a string. Direct interpolation will emit `[object Object]` in the prompt instead of the file path. Extract the `uniquePath` property like other multi-file templates do (e.g., `relativePaths[i].uniquePath` or via a helper function).</violation>
</file>

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[hiepau1231]

I have read the CLA Document and I hereby sign the CLA

[RomneyDa]

@hiepau1231 thanks for the contribution!