Function IsTextFile

pkg/chat/chat.go:252–259

IsTextFile determines if a file at the given path is a text file that should be inlined into the message rather than uploaded via a provider's file API. It first checks the file extension against a broad allowlist of known text extensions. For unknown extensions, it falls back to reading the first 8

(filePath string)

// extensions. For unknown extensions, it falls back to reading the first 8KB
// and checking if the content is valid UTF-8 with no null bytes.
func IsTextFile(filePath string) bool {
	ext := strings.ToLower(filepath.Ext(filePath))
	if isTextExtension(ext) {
		return true
	}
	// For unknown extensions, try byte-sniffing
	return isTextByContent(filePath)
}

// ReadFileForInline reads a text file and wraps it in an XML-like tag with
// the file path for context. Returns the formatted content and any error.