fix: filename can be nil

[phanen]

vim.schedule callback: vim/treesitter/languagetree.lua:215:
vim/filetype.lua:3160: At least one of "buf", "filename", or "contents"
must be given

[gemini-code-assist]

Summary of Changes

Hello @phanen, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a critical runtime error that occurred when the filename variable, derived from find_filename_in_parent_node, was nil before being passed to vim.filetype.match. The change introduces a defensive nil check, ensuring the application handles cases where a filename cannot be determined, thereby preventing crashes and improving the overall stability of the hmts_inject_handler logic.

Highlights

• Error Prevention: Implemented a nil check for the filename variable within the hmts_inject_handler function to prevent a runtime error.
• Robustness Improvement: Ensures that the vim.filetype.match function is not called with a nil filename, resolving an issue where find_filename_in_parent_node might return nil.

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[gemini-code-assist]

Code Review

This pull request correctly fixes a potential crash that occurs when find_filename_in_parent_node returns nil. The added check prevents vim.filetype.match from being called with a nil filename, which resolves the error mentioned in the description. I've added a minor suggestion to make the guard clause more concise and idiomatic.

[gemini-code-assist]

For better conciseness and to follow Lua idioms, you can use a one-line guard clause. In Lua, nil is falsy, so you can check for it with if not filename then ... end.

	if not filename then return end