/* Internet Archive directory listing searcher */

if(document.location.pathname.search("/download/") == 0) /* if directory listing viewed */ {
	var listing = document.getElementsByClassName("download-directory-listing")[0];

	// create search bar in memory before inserting
	var search_input = document.createElement("input");
	search_input.placeholder="search files";
	search_input.onkeyup=search_list;
	search_input.style.marginRight="1em";

	// create search result counter in memory before inserting
	var result_counter = document.createElement("span");	

	var listing_hr = listing.getElementsByTagName("hr")[0];
	listing.insertBefore(search_input, listing_hr); // insert search bar into page
	listing.insertBefore(result_counter, listing_hr); // insert result counter into page

	var list_items = document.getElementsByTagName("tr");
	var count = 0; // initialize counter for "for" loops
	var result_count = 0; // initialize result counter

}

function search_list() {
	result_count = 0; // reset result counter
	search_input.setAttribute("value",search_input.value); // compatibility
	for (count=2 /* skip "go to parent directory" */; count < list_items.length; count++) {
		// convert to case-insensitive
		var content_case_insensitive=list_items[count].innerHTML.toLowerCase();
		var search_case_insensitive = search_input.value.toLowerCase();

		// perform search
		if (content_case_insensitive.search(search_case_insensitive)<0) /* if no match */ {
			list_items[count].style.display="none"; /* hide */
		} else {
			list_items[count].style.display=""; // fall back to original CSS by resetting to undefined
			result_count++; // count results
			}
	}
	result_counter.innerHTML = result_count;
	if (result_count == 1) result_counter.innerHTML += " result"; // singular
		else result_counter.innerHTML += " results"; // plural
}