Function validate_file_extension 

pub fn validate_file_extension(
    path: &Path,
    arg_name: &str,
    expected: &[String],
) -> Result<()>

Validate that a file has one of the expected extensions

This function checks if the file’s extension matches one of the allowed extensions. The comparison is case-insensitive.

Arguments

• path - Path to the file
• arg_name - Name of the argument (for error messages)
• expected - List of allowed extensions (without the leading dot)

Returns

• Ok(()) if the file has an allowed extension
• Err(ValidationError::InvalidExtension) if the extension doesn’t match

Extension Format

Extensions should be specified without the leading dot:

• ✅ Correct: ["yaml", "yml"]
• ❌ Incorrect: [".yaml", ".yml"]

Case Sensitivity

The validation is case-insensitive:

• "config.YAML" matches ["yaml"] ✅
• "config.Yml" matches ["yml"] ✅

Example

use dynamic_cli::validator::file_validator::validate_file_extension;
use std::path::Path;

let path = Path::new("config.yaml");
let allowed = vec!["yaml".to_string(), "yml".to_string()];

validate_file_extension(path, "config_file", &allowed)?;

Error Messages

If the extension is invalid, the error includes:

• The argument name
• The file path
• The list of expected extensions

Example: Invalid file extension for config_file: "config.txt". Expected: yaml, yml