Markus Kirschner Pegolon

Full-fledged expert with almost three decades of software development expertise

Pegolon / TestDictionaryPerformance.m

Created January 28, 2016 11:36

Performance of NSDictionary initialization

	- (void)test_stepByStep_withCapacity
	{
	NSMutableArray *keys = [NSMutableArray new];
	NSMutableArray *values = [NSMutableArray new];
	srand(0x21112005);
	int entryCount = 1000000;
	for (int ix = 0, ixMax = entryCount; ix < ixMax ; ix++) {
	NSString *key = [NSString stringWithFormat:@"Key#%d", (ix + 1)];
	NSString *value = [NSString stringWithFormat:@"Value with %d", rand()];
	[keys addObject:key];

Pegolon / replace_xml.rb

Created January 14, 2016 12:14

Find all XML files and replace multiple strings

	hash2id={"replace1":"with1","replace2":"with2"}

	xml_files=`find "/path/to/folder" -type f -name '*.xml'`.strip.split("\n")

	xml_files.each do \|xml_file\|
	puts "Processing #{xml_file}"
	original_text=File.read(xml_file)
	text=original_text.dup
	hash2id.each do \|hash,id\|
	text.gsub!(hash.to_s, id)

Pegolon / gist:0ff649190ddf80901912

Created July 15, 2015 10:40

Start app with lldb

	# Select Xcode
	sudo xcode-select --switch /Applications/Xcode.app/

	# run app with lldb
	xcrun lldb ...path to application.../Contents/MacOS/binaryname
	(lldb) run

	# pause app
	ctrl+c

Pegolon / gist:d2a9b31223be77deb2f4

Created July 14, 2015 13:42

Highlight layer with short animation

	CABasicAnimation *color = [CABasicAnimation animationWithKeyPath:@"borderColor"];
	color.fromValue = (id)[UIColor clearColor].CGColor;
	color.toValue = (id)[UIColor redColor].CGColor;
	CABasicAnimation *width = [CABasicAnimation animationWithKeyPath:@"borderWidth"];
	width.fromValue = @0;
	width.toValue = @1.5;
	CAAnimationGroup *both = [CAAnimationGroup animation];
	both.duration = 0.5;
	both.animations = @[color, width];
	both.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];

Pegolon / gist:1851436

Created February 17, 2012 07:02

Showing clang predefined macros

	> find /Applications/Xcode.app -name clang
	# Pick one
	> /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -x c /dev/null -dM -E

Pegolon / gist:1646742

Created January 20, 2012 11:14

Use a semaphore to block an asynchronous call

	__block dispatch_semaphore_t semaphore = dispatch_semaphore_create(0);

	[self callAsyncBlock:^() {
	// Do some work
	dispatch_semaphore_signal(semaphore);
	}];

	// Wait until the semaphore has been signaled
	dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER);
	dispatch_release(semaphore);

Pegolon / gist:1550345

Created January 2, 2012 11:26

Remove extra space from ObjC method signature

	Find: ^([+-] $.* \*$)( )
	Replace: \1

Pegolon / Count lines of code

Created March 29, 2011 12:19

Find all header and implementation files and count the loc

find Classes -name '*.[hmM]' -print0|xargs -0 wc -l

Pegolon / Repair a corrupt sqlite database

Created March 15, 2011 18:38

If you get an error like SQLite error code:11, 'database disk image is malformed' you can try to dump and reload the database with these commands

	cd "$DATABASE_LOCATION"
	echo '.dump'\|sqlite3 $DB_NAME\|sqlite3 repaired_$DB_NAME
	mv $DB_NAME corrupt_$DB_NAME
	mv repaired_$DB_NAME $DB_NAME

Pegolon / show_branch_prompt.sh

Created January 7, 2011 10:10

Shows the current branch of a git or mercurial repository as the last part of your command line prompt

	function parse_branch {
	local BRANCH=$(git branch --no-color 2> /dev/null \| sed -e '/^[^]/d' -e 's/ $.*$/(\1)/')
	if [ -z "$BRANCH" ]
	then
	BRANCH=$(hg branch 2>/dev/null)
	if [ -n "$BRANCH" ]
	then
	BRANCH="("$BRANCH")"
	fi
	fi