Rust hell.rs

use std::io::File;
use std::sync::Arc;
use std::io::stdio::println;
use std::iter::AdditiveIterator;

static function_headers_marker: &'static str = "{$region functions_header}";
static function_headers_end_marker: &'static str = "{$endRegion functions_header}";

fn write_line(string: String) {
	let string = string.as_slice();
	std::io::stdio::println(string);
}

fn concat_strings(strings: &[String]) -> String {
	let result_length = strings.iter().map(|ref s| s.len()).sum();
	let mut result = String::with_capacity(result_length);
	for string in strings.iter() {
		let string = string.as_slice();
		result.push_str(string);
	}
	result
}

/// Accepts file content. Returns processed file content.
fn convert(content: String) -> String {
	let content = content.as_slice();
	let function_headers_marker_position = content.find_str(function_headers_marker);
	let function_headers_end_marker_position = content.find_str(function_headers_end_marker);
	if function_headers_marker_position.is_some() && function_headers_end_marker_position.is_some() {
		let function_headers_marker_position = function_headers_marker_position.unwrap();
		let function_headers_end_marker_position = function_headers_end_marker_position.unwrap();
		let header_content = content.slice_chars(function_headers_marker_position + function_headers_marker.len(), function_headers_end_marker_position - 1);
		write_line("Debug: header content is: '".to_string() + header_content + "'");
	}
	else {
		write_line(concat_strings(&[
			"Error: ".to_string(), 
			if function_headers_marker_position.is_none() {concat_strings(&["function headers marker not found: '".to_string(), function_headers_marker.to_string(), "'".to_string()])} 
			else if function_headers_end_marker_position.is_none() {concat_strings(&["function headers end marker not found: '".to_string(), function_headers_marker.to_string(), "'".to_string()])}
			else {"unknown error".to_string()}
		]))
	}
	let mut result = String::new();
	result
}