Function validate_file_extension 

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

Validate that a file has an allowed extension.

The comparison is case-insensitive. Extensions should be provided without the leading dot (e.g., "yaml", not ".yaml").

Arguments

• path - The path whose extension to check
• arg_name - The argument name (used in error messages)
• allowed - List of allowed extensions (without leading dot)

Returns

• Ok(()) if the extension is in the allowed list
• Err(ValidationError::InvalidExtension) otherwise

Example

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

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