shlist

MainTableViewController.m (23636B)

---

 #import "AddressBook.h"
 #import "MainTableViewController.h"
 #import "NewListTableViewController.h"
 #import "Network.h"
 #import "ListTableViewController.h"
 #import "MsgTypes.h"
 
 #import <AddressBook/AddressBook.h>
 #include "libkern/OSAtomic.h"
 
 @interface MainTableViewController () {
 	NSString *phone_number;
 	Network *network_connection;
 	NSString *phone_num_file;
 }
 
 // main data structure, [0] holds lists you're in, [1] is other lists
 @property NSMutableArray *lists;
 
 @property NSMutableDictionary *phnum_to_name_map;
 @property (strong, retain) AddressBook *address_book;
 
 @end
 
 @implementation MainTableViewController
 
 - (void) dealloc
 {
 	[[NSNotificationCenter defaultCenter] removeObserver:self];
 }
 
 - (void) viewDidLoad
 {
 	[super viewDidLoad];
 
 	NSNotificationCenter *default_center = [NSNotificationCenter defaultCenter];
 	NSString *notification_name;
 
 	// Listen for push notifications
 	[default_center addObserver:self selector:@selector(push_friend_added_list:)
 			       name:@"PushNotification_friend_added_list" object:nil];
 
 	/*
 	[default_center addObserver:self selector:@selector(push_updated_list:)
 			       name:@"PushNotification_updated_list" object:nil];
 	 */
 
 	const SEL selectors[] = {
 		@selector(lists_get_finished:),
 		@selector(lists_get_other_finished:),
 		@selector(finished_new_list_request:),
 		@selector(finished_join_list_request:),
 		@selector(finished_leave_list_request:)
 	};
 	NSUInteger count = 0;
 
 	// This object handles responses for these types of messages
 	for (id str in @[@"lists_get", @"lists_get_other", @"list_add", @"list_join", @"list_leave"]) {
 		notification_name = [NSString stringWithFormat:@"NetworkResponseFor_%@", str];
 		[default_center addObserver:self selector:selectors[count] name:notification_name object:nil];
 		count++;
 	}
 
 	// display an Edit button in the navigation bar for this view controller
 	self.navigationItem.leftBarButtonItem = self.editButtonItem;
 
 	network_connection = [Network shared_network_connection];
 
 	_lists = [[NSMutableArray alloc] init];
 	[_lists addObject:[[NSMutableArray alloc] init]];
 	[_lists addObject:[[NSMutableArray alloc] init]];
 
 	// store the path to the phone number file
 	NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
 	NSString *documentsDirectory = [paths objectAtIndex:0];
 	phone_num_file = [documentsDirectory stringByAppendingPathComponent:@"phone_num"];
 
 	phone_number = nil;
 	if ([self load_phone_number]) {
 		// phone number loaded, try loading device id
 		if ([network_connection load_device_id:phone_number]) {
 
 			// Send lists_get request, no arguments required here
 			NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];
 			[network_connection send_message:lists_get contents:dict];
 
 			// Send lists_get_other request, no arguments here either
 			[dict removeAllObjects];
 			[network_connection send_message:lists_get_other contents:dict];
 		}
 		// else, device id request sent
 	}
 	// else, phone number entry is on screen
 
 	_phnum_to_name_map = [[NSMutableDictionary alloc] init];
 
 	// get instance and wait for privacy window to clear
 	_address_book = [AddressBook shared_address_book];
 	_address_book.main_tvc = self;
 }
 
 // Handle 'friend_added_list' message from notification service
 - (void) push_friend_added_list:(NSNotification *) notification
 {
 	NSDictionary *json_list = notification.userInfo;
 
 	// Server will only send back partial list information because this will
 	// always be put in the other lists section
 	SharedList *tmp = [self deserialize_light_list:json_list];
 
 	NSMutableArray *other_lists = [_lists objectAtIndex:1];
 	[other_lists addObject:tmp];
 
 	NSLog(@"notify: new other list '%@', num '%@'", tmp.name, tmp.num);
 
 	NSIndexPath *new_path = [NSIndexPath indexPathForRow:[other_lists count] - 1 inSection:1];
 	[self.tableView insertRowsAtIndexPaths:@[new_path] withRowAnimation:UITableViewRowAnimationAutomatic];
 
 	[self update_section_headers];
 }
 
 - (bool) load_phone_number
 {
 	if ([[NSFileManager defaultManager] fileExistsAtPath:phone_num_file]) {
 		// file exists, read what it has
 		// XXX: validate length of file too
 		NSError *error = nil;
 		phone_number = [NSString stringWithContentsOfFile:phone_num_file encoding:NSASCIIStringEncoding error:&error];
 		return true;
 	}
 
 	UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Important"
 		message:@"We need this phone's number to find your mutual friends."
 		delegate:self cancelButtonTitle:@"Nope" otherButtonTitles:@"Ok", nil];
 
 	alert.alertViewStyle = UIAlertViewStylePlainTextInput;
 
 	// it's a phone number, so only show the number pad
 	UITextField * alertTextField = [alert textFieldAtIndex:0];
 	alertTextField.keyboardType = UIKeyboardTypeNumberPad;
 	alertTextField.placeholder = @"Enter your phone number";
 
 	[alert show];
 	return false;
 }
 
 - (void)alertView:(UIAlertView *)alertView
 clickedButtonAtIndex:(NSInteger)buttonIndex
 {
 	NSString *entered_phone_num = [[alertView textFieldAtIndex:0] text];
 	NSLog(@"warn: main: writing phone num '%@' to disk", entered_phone_num);
 	NSError *error;
 	[entered_phone_num writeToFile:phone_num_file atomically:YES encoding:NSASCIIStringEncoding error:&error];
 
 	if (error)
 		NSLog(@"warn: main: writing phone number file: %@", error);
 
 	if ([entered_phone_num compare:@""] == NSOrderedSame) {
 		NSLog(@"warn: load phone number: entered emtpy phone number");
 	}
 
 	phone_number = entered_phone_num;
 
 	if ([network_connection load_device_id:phone_number]) {
 		NSLog(@"info: network: connection ready");
 		// bulk update, doesn't take a payload
 		[network_connection send_message:3 contents:nil];
 	}
 	// else, device id request sent
 }
 
 - (void) update_address_book
 {
 	[_phnum_to_name_map removeAllObjects];
 	// XXX: it'd be nice to resize phnum_to_name_map to num_contacts here
 
 	for (Contact *contact in _address_book.contacts) {
 		NSString *disp_name;
 		// show first name and last initial if possible, otherwise
 		// just show the first name or the last name or the phone number
 		if (contact.first_name && contact.last_name)
 			disp_name = [NSString stringWithFormat:@"%@ %@",
 				     contact.first_name, [contact.last_name substringToIndex:1]];
 		else if (contact.first_name)
 			disp_name = contact.first_name;
 		else if (contact.last_name)
 			disp_name = contact.last_name;
 		else if ([contact.phone_numbers count])
 			disp_name = [contact.phone_numbers objectAtIndex:0];
 		else
 			disp_name = @"No Name";
 
 		// map the persons known phone number to their massaged name
 		for (NSString *tmp_phone_number in contact.phone_numbers)
 			[_phnum_to_name_map setObject:disp_name forKey:tmp_phone_number];
 	}
 }
 
 - (void) didReceiveMemoryWarning
 {
 	[super didReceiveMemoryWarning];
 	// Dispose of any resources that can be recreated.
 }
 
 - (NSInteger) numberOfSectionsInTableView:(UITableView *)tableView
 {
 	// "lists you're in" and "other lists"
 	return 2;
 }
 
 - (NSInteger) tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
 {
 	if (section > 1)
 		// should never happen
 		return 0;
 
 	return [[_lists objectAtIndex:section] count];
 }
 
 // new list dialogue has been saved
 - (IBAction) unwindToList:(UIStoryboardSegue *)segue
 {
 }
 
 - (void) lists_get_finished:(NSNotification *)notification
 {
 	NSDictionary *response_dict = notification.userInfo;
 	// Already checked for existence before this function was called
 	NSArray *json_lists = response_dict[@"data"];
 
 	NSLog(@"lists_get: got %lu lists from server", (unsigned long)[json_lists count]);
 
 	NSMutableArray *lists = [_lists objectAtIndex:0];
 	[lists removeAllObjects];
 
 	for (NSDictionary *list in json_lists) {
 		SharedList *tmp = [self deserialize_full_list:list];
 		[lists addObject:tmp];
 
 		NSLog(@"adding list '%@', num '%@'", tmp.name, tmp.num);
 	}
 
 	NSIndexSet *section = [NSIndexSet indexSetWithIndex:0];
 	[self.tableView reloadSections:section withRowAnimation:UITableViewRowAnimationNone];
 }
 
 - (void) lists_get_other_finished:(NSNotification *)notification;
 {
 	NSDictionary *response_dict = notification.userInfo;
 	// Already checked for existence before this function was called
 	NSArray *other_json_lists = response_dict[@"data"];
 
 	NSLog(@"lists_get_other: got %lu other lists from server", (unsigned long)[other_json_lists count]);
 
 	NSMutableArray *other_lists = [_lists objectAtIndex:1];
 	[other_lists removeAllObjects];
 
 	for (NSDictionary *list in other_json_lists) {
 		SharedList *tmp = [self deserialize_light_list:list];
 		[other_lists addObject:tmp];
 
 		NSLog(@"adding other list '%@', num '%@'", tmp.name, tmp.num);
 	}
 
 	NSIndexSet *section = [NSIndexSet indexSetWithIndex:1];
 	[self.tableView reloadSections:section withRowAnimation:UITableViewRowAnimationNone];
 }
 
 - (void) finished_new_list_request:(NSNotification *) notification
 {
 	NSDictionary *response = notification.userInfo;
 	NSDictionary *list = [response objectForKey:@"data"];
 
 	SharedList *shlist = [self deserialize_full_list:list];
 
 	NSMutableArray *lists = [_lists objectAtIndex:0];
 	[lists addObject:shlist];
 
 	// response looks good, insert the new list
 	NSUInteger new_row_pos = [lists count] - 1;
 	NSIndexPath *index_path = [NSIndexPath indexPathForRow:new_row_pos inSection:0];
 	[self.tableView insertRowsAtIndexPaths:@[index_path] withRowAnimation:UITableViewRowAnimationFade];
 
 	[self update_section_headers];
 }
 
 - (SharedList *) deserialize_full_list:(NSDictionary *)json_list
 {
 	SharedList *shlist = [[SharedList alloc] init];
 	shlist.num = [json_list objectForKey:@"num"];
 
 	// We need some careful decoding to get a usable Unicode string
 	NSData *name_data = [json_list[@"name"] dataUsingEncoding:NSISOLatin1StringEncoding];
 	shlist.name = [[NSString alloc] initWithData:name_data encoding:NSUTF8StringEncoding];
 
 	NSNumber *date = json_list[@"date"];
 	if ([date intValue] != 0) {
 		shlist.date = [NSDate dateWithTimeIntervalSince1970:[date floatValue]];
 	}
 	else {
 		shlist.date = nil;
 	}
 
 	shlist.members_phone_nums = [json_list objectForKey:@"members"];
 	shlist.items_ready = [json_list objectForKey:@"items_complete"];
 	shlist.items_total = [json_list objectForKey:@"items_total"];
 
 	return shlist;
 }
 
 - (SharedList *) deserialize_light_list:(NSDictionary *)json_list
 {
 	SharedList *shlist = [[SharedList alloc] init];
 	shlist.num = [json_list objectForKey:@"num"];
 
 	// We need some careful decoding to get a usable Unicode string
 	NSData *name_data = [json_list[@"name"] dataUsingEncoding:NSISOLatin1StringEncoding];
 	shlist.name = [[NSString alloc] initWithData:name_data encoding:NSUTF8StringEncoding];
 
 	shlist.members_phone_nums = [json_list objectForKey:@"members"];
 
 	return shlist;
 }
 
 // major thing here is join list requests
 - (void)tableView:(UITableView *)tableView
 	didSelectRowAtIndexPath:(NSIndexPath *)indexPath
 {
 	[tableView deselectRowAtIndexPath:indexPath animated:YES];
 
 	// section 0 is going to segue to the list items screen
 	if ([indexPath section] == 0)
 		return;
 
 	// we're in section 1 now, a tap down here means we're doing a join list request
 	SharedList *list = [[_lists objectAtIndex:1] objectAtIndex:[indexPath row]];
 	NSLog(@"info: joining list '%@'", list.name);
 
 	// the response for this does all of the heavy row moving work
 	NSMutableDictionary *request = [[NSMutableDictionary alloc] init];
 	[request setObject:list.num forKey:@"list_num"];
 	[network_connection send_message:list_join contents:request];
 }
 
 - (void) finished_join_list_request:(NSNotification *) notification
 {
 	NSDictionary *response = notification.userInfo;
 	NSDictionary *json_list = response[@"list"];
 	NSLog(@"network: joined list %@", json_list[@"num"]);
 
 	NSMutableArray *lists = [_lists objectAtIndex:0];
 	NSMutableArray *other_lists = [_lists objectAtIndex:1];
 
 	// Find the list number we received a response for
 	SharedList *needle = nil;
 	for (SharedList *temp in other_lists) {
 		if (temp.num == json_list[@"num"]) {
 			needle = temp;
 			break;
 		}
 	}
 
 	// If we received an update from a list id we don't know about, do nothing
 	if (needle == nil)
 		return;
 
 	// The server sent us a full list object, make sure to copy cell reference
 	SharedList *joined_list = [self deserialize_full_list:json_list];
 	joined_list.cell = needle.cell;
 
 	// Add completely new object to lists section and remove the old list
 	[lists addObject:joined_list];
 	[other_lists removeObject:needle];
 
 	// Get the cell index path from the matched list cell
 	NSIndexPath *orig_index_path = [self.tableView indexPathForCell:joined_list.cell];
 
 	// Compute new position and start moving row as soon as possible
 	// XXX: sorting
 	NSUInteger new_row_pos = [lists count] - 1;
 	NSIndexPath *new_index_path = [NSIndexPath indexPathForRow:new_row_pos inSection:0];
 	[self.tableView moveRowAtIndexPath:orig_index_path toIndexPath:new_index_path];
 
 	[self update_section_headers];
 
 	// Update members in list row
 	[self process_members_array:joined_list.members_phone_nums cell:joined_list.cell];
 
 	// Add > accessory indicator
 	joined_list.cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
 
 	// Find fraction UILAbel, populate it and then show it
 	UILabel *fraction = (UILabel *)[joined_list.cell viewWithTag:4];
 	fraction.text = [self fraction:joined_list.items_ready denominator:joined_list.items_total];
 	fraction.hidden = NO;
 
 	// Show date label if date has been set to something
 	if (joined_list.date != nil) {
 		UILabel *deadline_label = (UILabel *)[joined_list.cell viewWithTag:3];
 		deadline_label.hidden = NO;
 	}
 }
 
 
 // section header titles
 - (NSString *)tableView:(UITableView *)tableView
 titleForHeaderInSection:(NSInteger)section
 {
 	if (section > 1)
 		// should not happen
 		return @"";
 
 	unsigned long total = [[_lists objectAtIndex:section] count];
 	if (section == 0)
 		return [NSString stringWithFormat:@"Your Lists (%lu)", total];
 	else if (section == 1)
 		return [NSString stringWithFormat:@"Other Lists (%lu)", total];
 	return @"";
 }
 
 - (void) update_section_headers
 {
 	NSMutableArray *lists = [_lists objectAtIndex:0];
 	NSMutableArray *other_lists = [_lists objectAtIndex:1];
 
 	UITableViewHeaderFooterView *sectionZeroHeader = [self.tableView headerViewForSection:0];
 	UITableViewHeaderFooterView *sectionOneHeader = [self.tableView headerViewForSection:1];
 	NSString *sectionZeroLabel = [NSString stringWithFormat:@"Your Lists (%lu)", (unsigned long)[lists count]];
 	NSString *sectionOneLabel = [NSString stringWithFormat:@"Other Lists (%lu)", (unsigned long)[other_lists count]];
 
 	[sectionZeroHeader.textLabel setText:sectionZeroLabel];
 	[sectionZeroHeader setNeedsLayout];
 	[sectionOneHeader.textLabel setText:sectionOneLabel];
 	[sectionOneHeader setNeedsLayout];
 }
 
 - (void) finished_leave_list_request:(NSNotification *) notification
 {
 	NSDictionary *response = notification.userInfo;
 	NSNumber *list_num = response[@"list_num"];
 	NSLog(@"network: left list %@", list_num);
 
 	NSMutableArray *lists = [_lists objectAtIndex:0];
 	NSMutableArray *other_lists = [_lists objectAtIndex:1];
 
 	SharedList *list = nil;
 	for (SharedList *temp in lists) {
 		if (temp.num == response[@"list_num"]) {
 			list = temp;
 			break;
 		}
 	}
 	if (list == nil)
 		return;
 
 	NSNumber *list_empty = response[@"list_empty"];
 	if ([list_empty intValue] == 1) {
 		// List was empty, delete instead of moving it
 		[lists removeObject:list];
 
 		NSIndexPath *old_path = [self.tableView indexPathForCell:list.cell];
 		[self.tableView deleteRowsAtIndexPaths:@[old_path] withRowAnimation:UITableViewRowAnimationAutomatic];
 
 		[self update_section_headers];
 		return;
 	}
 
 	// Insert the new object at the beginning to match gui moving below
 	[other_lists insertObject:list atIndex:0];
 	[lists removeObject:list];
 
 	// Perform row move, the destination is the top of "other lists"
 	NSIndexPath *old_path = [self.tableView indexPathForCell:list.cell];
 	NSIndexPath *new_path = [NSIndexPath indexPathForRow:0 inSection:1];
 	[self.tableView moveRowAtIndexPath:old_path toIndexPath:new_path];
 
 	// Make sure section headers are accurate
 	[self update_section_headers];
 
 	// Remove yourself from the members array
 	NSMutableArray *members = [list.members_phone_nums mutableCopy];
 	NSUInteger index = [members indexOfObject:@"4037082094"];
 	if (index != NSNotFound) {
 		[members removeObjectAtIndex:index];
 	}
 	[self process_members_array:members cell:list.cell];
 
 	// Remove > accessory
 	list.cell.accessoryType = UITableViewCellAccessoryNone;
 
 	// Hide completion fraction
 	UILabel *fraction = (UILabel *)[list.cell viewWithTag:4];
 	fraction.hidden = YES;
 
 	// Hide date
 	UILabel *deadline_label = (UILabel *)[list.cell viewWithTag:3];
 	deadline_label.hidden = YES;
 
 	// XXX: update members array to disclude yourself (maybe send it back in response?)
 	// XXX: Maybe clear out list data that's no longer needed
 	// XXX: give some visual feedback here what's happening
 }
 
 
 - (UITableViewCell *) tableView:(UITableView *)tableView
 	  cellForRowAtIndexPath:(NSIndexPath *)indexPath
 {
 	UITableViewCell *cell;
 	cell = [tableView dequeueReusableCellWithIdentifier:@"SharedListPrototypeCell" forIndexPath:indexPath];
 
 	NSInteger section = [indexPath section];
 	NSInteger row = [indexPath row];
 	SharedList *shared_list = [[_lists objectAtIndex:section] objectAtIndex:row];
 
 	UILabel *deadline_label = (UILabel *)[cell viewWithTag:3];
 	UILabel *fraction_label = (UILabel *)[cell viewWithTag:4];
 
 	if (section == 0) {
 		// your lists section
 
 		if (shared_list.date == nil) {
 			deadline_label.hidden = YES;
 		} else {
 			// XXX: calculate how long until deadline
 			// NSDate *date = shared_list.date;
 			deadline_label.text = @"date";
 		}
 
 		float frac = [shared_list.items_ready floatValue]  / [shared_list.items_total floatValue];
 		if (frac > 0.80f)
 			fraction_label.textColor = [UIColor greenColor];
 		fraction_label.hidden = NO;
 		fraction_label.text = [self fraction:shared_list.items_ready
 					      denominator:shared_list.items_total];
 
 		// Add ">" accessory to indicate you can "enter" this list
 		cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
 
 	}
 	else if (section == 1) {
 		// "other lists" section
 
 		// no deadline
 		deadline_label.text = @"";
 
 		// remove the > accessory and the completion fraction
 		cell.accessoryType = UITableViewCellAccessoryNone;
 		fraction_label.hidden = YES;
 	}
 
 	UILabel *main_label = (UILabel *)[cell viewWithTag:1];
 	main_label.text = shared_list.name;
 
 	[self process_members_array:shared_list.members_phone_nums cell:cell];
 
 	// hang on to a reference, this is needed in the networking gui callbacks
 	shared_list.cell = cell;
 	return cell;
 }
 
 - (void) process_members_array:(NSArray *)phnum_array cell:(UITableViewCell *)cell
 {
 	UILabel *members_label = (UILabel *)[cell viewWithTag:2];
 
 	if (!OSAtomicAnd32(0xffff, &_address_book->ready)) {
 		// not ready
 		NSMutableString *output = [[NSMutableString alloc] init];
 		for (id tmp_phone_number in phnum_array) {
 			if ([tmp_phone_number compare:phone_number] == NSOrderedSame) {
 				[output appendString:@"You"];
 				continue;
 			}
 
 			[output appendFormat:@", %@", tmp_phone_number];
 		}
 		members_label.text = output;
 		return;
 	}
 
 	// we can do phone number to name mappings
 	NSMutableArray *members = [[NSMutableArray alloc] init];
 	int others = 0;
 
 	// anything past the second field are list members
 	for (id tmp_phone_number in phnum_array) {
 
 		// try to find the list member in our address book
 		NSString *name = _phnum_to_name_map[tmp_phone_number];
 
 		if (name)
 			[members addObject:name];
 		else if (phone_number && ([phone_number compare:tmp_phone_number] == NSOrderedSame))
 			[members addObject:@"You"];
 		else
 			// didn't find it, you don't know this person
 			others++;
 	}
 
 	NSMutableString *members_str =
 	[[members componentsJoinedByString:@", "] mutableCopy];
 
 	if (others) {
 		char *plural;
 		if (others == 1)
 			plural = "other";
 		else
 			plural = "others";
 
 		NSString *buf = [NSString stringWithFormat:@" + %i %s",
 				 others, plural];
 		[members_str appendString:buf];
 	}
 
 	members_label.text = members_str;
 }
 
 
 // only section 0 lists can be edited
 - (BOOL) tableView:(UITableView *)tableView
 	canEditRowAtIndexPath:(NSIndexPath *)indexPath
 {
 	if ([indexPath section] == 0)
 		return YES;
 	return NO;
 }
 
 // what editing style should be applied to this indexpath
 - (UITableViewCellEditingStyle)tableView:(UITableView *)tableView
 	   editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath
 {
 	// don't have to check the section here because canEditRowAtIndexPath
 	// already said the section can't be edited
 	return UITableViewCellEditingStyleDelete;
 }
 
 // This functions called when delete has been prompted and ok'd
 - (void) tableView:(UITableView *)tableView
 	commitEditingStyle:(UITableViewCellEditingStyle)editingStyle
 	forRowAtIndexPath:(NSIndexPath *)indexPath
 {
 	// we don't need to check for !section 0 because of canEditRowAtIndexPath
 	SharedList *list = [[_lists objectAtIndex:0] objectAtIndex:[indexPath row]];
 	NSLog(@"info: leaving '%@' list num '%@'", list.name, list.num);
 
 	// Send leave list message, response will do all heavy lifting
 	NSMutableDictionary *request = [[NSMutableDictionary alloc] init];
 	[request setObject:list.num forKey:@"list_num"];
 	[network_connection send_message:list_leave contents:request];
 
 	// Reset editing state back to the default
 	[self.tableView setEditing:FALSE animated:TRUE];
 }
 
 // customize deletion label text
 - (NSString *)tableView:(UITableView *)tableView
 	titleForDeleteConfirmationButtonForRowAtIndexPath:(NSIndexPath *)indexPath
 {
 	return @"Leave";
 }
 
 // tell incoming controllers about their environment
 - (void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
 {
 	if ([[segue identifier] isEqualToString:@"show list segue"]) {
 		// a shared list was selected, transfer into detailed view
 
 		NSIndexPath *path = [self.tableView indexPathForSelectedRow];
 		SharedList *list = [[_lists objectAtIndex:0] objectAtIndex:[path row]];
 
 		// make sure incoming view controller knows about itself
 		[segue.destinationViewController setMetadata:list];
 
 		// send update list items message
 		// network_connection->shlist_ldvc = segue.destinationViewController;
 		//[network_connection send_message:6 contents:list.id];
 	}
 
 	// DetailObject *detail = [self detailForIndexPath:path];
 	NSLog(@"info: main: preparing for segue");
 }
 
 // prevent segues from occurring when non member lists are selected
 - (BOOL)shouldPerformSegueWithIdentifier:(NSString *)identifier sender:(id)sender
 {
 	NSIndexPath *path = [self.tableView indexPathForSelectedRow];
 
 	if ([path section] == 0)
 		return YES;
 	return NO;
 }
 
 // taken from http://stackoverflow.com/questions/30859359/display-fraction-number-in-uilabel
 -(NSString *)fraction:(NSNumber *)numerator denominator:(NSNumber *)denominator
 {
 
 	NSMutableString *result = [NSMutableString string];
 
 	NSString *one = [numerator stringValue];
 	for (int i = 0; i < one.length; i++) {
 		[result appendString:[self superscript:[[one substringWithRange:NSMakeRange(i, 1)] intValue]]];
 	}
 
 	[result appendString:@"/"];
 
 	NSString *two = [denominator stringValue];
 	for (int i = 0; i < two.length; i++) {
 		[result appendString:[self subscript:[[two substringWithRange:NSMakeRange(i, 1)] intValue]]];
 	}
 
 	return result;
 }
 
 -(NSString *)superscript:(int)num
 {
 	NSDictionary *superscripts = @{@0: @"\u2070", @1: @"\u00B9", @2: @"\u00B2", @3: @"\u00B3", @4: @"\u2074", @5: @"\u2075", @6: @"\u2076", @7: @"\u2077", @8: @"\u2078", @9: @"\u2079"};
 	return superscripts[@(num)];
 }
 
 -(NSString *)subscript:(int)num
 {
 	NSDictionary *subscripts = @{@0: @"\u2080", @1: @"\u2081", @2: @"\u2082", @3: @"\u2083", @4: @"\u2084", @5: @"\u2085", @6: @"\u2086", @7: @"\u2087", @8: @"\u2088", @9: @"\u2089"};
 	return subscripts[@(num)];
 }
 
 @end