Module validation 

Configuration validation and error reporting.

This module provides validation for configuration files with:

• TOML syntax validation
• Type checking (expected vs actual types)
• Unknown key detection with typo suggestions (Levenshtein distance)
• Multi-file error aggregation
• User-friendly error messages

Architecture

The validation process follows these steps:

1. Parse TOML syntax → ConfigValidationError::TomlSyntax on failure
2. Detect unknown/deprecated keys → ConfigValidationError::UnknownKey + warnings
3. Validate types against schema → ConfigValidationError::InvalidValue on mismatch

Modules

• levenshtein: String distance calculation for typo suggestions
• keys: Valid configuration key definitions
• key_detection: TOML structure traversal for unknown key detection
• error_formatting: User-friendly error message generation

Enums

ConfigValidationError

Configuration validation error.

Functions

format_validation_errors

Format validation errors for user display.

suggest_key

Find the closest valid key name for typo detection.

validate_config_file

Validate a config file and collect errors and warnings.

Type Aliases

ValidationResult

Result of config validation. On success: Ok(warnings) where warnings is a Vec of deprecation warnings On failure: Err(errors) where errors is a Vec