Category: Coding & Scripting

Sourcetree keeps asking for password

When Sourcetree keeps asking for password when committing or pushing data to a server, the following solution worked for me:

Go to terminal in your project folder and enter:

git config credential.helper store
git pull

Input your username and password and press enter. That’s it.

Source (somewhere in between the lines):

PNG – deactivate interlace to avoid ‘libpng warning: Interlace handling should be turned on when using png_read_image’

I stumbled appon a warning message that was thrown by PHP when handling images with GD lib (e.g. imagecreatefrompng()). The message shown was:

libpng warning: Interlace handling should be turned on when using png_read_image

This message even exists, when deactivating ‘interlace’ with the help of:

imageinterlace($img, false);

The only solution is to deactivate for the processed image(s). This is possible with ImageMagick. To deactivate interlace on all images of a folder, the following command can be used:

magick mogrify -interlace none *.png

I used ImageMagick on macos and installed it with with HomeBrew:

brew install imagemagick

Composer – PHP Fatal error: Allowed memory size of ## bytes exhausted

Composer may sometimes fail on some commands with this message:

PHP Fatal error: Allowed memory size of ## bytes exhausted <...

In this case, the PHP memory_limit should be increased.

Note: Composer internally increases the memory_limit to 1.5G.

To get the current memory_limit value, run:

php -r "echo ini_get('memory_limit').PHP_EOL;"

Try increasing the limit in your php.ini file (ex. /etc/php5/cli/php.ini for Debian-like systems):

; Use -1 for unlimited or define an explicit value like 2G
memory_limit = -1

Composer also respects a memory limit defined by the COMPOSER_MEMORY_LIMIT environment variable:

COMPOSER_MEMORY_LIMIT=-1 composer.phar <...>

Or, you can increase the limit with a command-line argument:

php -d memory_limit=-1 composer.phar <...>

This issue can also happen on cPanel instances, when the shell fork bomb protection is activated. For more information, see the documentation of the fork bomb feature on the cPanel site.


Xcode fails to generate source files from intent definition files when using the Legacy Build System

The workaround for this problem is the following: First, add a Run Script phase before the Compile Sources phase of your target:

xcrun intentbuilderc generate -input ${SRCROOT}/PATH/TO/Intents.intentdefinition -output ${SRCROOT}/Intents -classPrefix "" -language Swift -swiftVersion 5.0

Then, add all of the generated files from the output path specified in the command above to all required targets in your project.


Background tasks in iOS

As already discussed in Background task in iOS action extension, it sometimes becomes necessary to perform time consuming tasks in the background. This is really important, if such a task would block the user interaction. Especially for action and share extensions, this might lead to some waiting time before a task completes and the extension disappears. After several attempts to realise a working solution, the following code help to extends an App’s background execution time.

This code was described in the article Extending Your App’s Background Execution Time.

Extending the background execution time in an app

func performTask()
   // Perform the task on a background queue. {
      // Request the task assertion and save the ID.
      self.backgroundTaskID = UIApplication.shared.
                 beginBackgroundTask (withName: "Perform Long Task") {
         // End the task if time expires.
         self.backgroundTaskID = UIBackgroundTaskInvalid
      // Run task synchronously.
      // End the task assertion.
      self.backgroundTaskID = UIBackgroundTaskInvalid

Extending the background execution time in an extension

func performTask()
   // Perform the task in background.
   let processinfo = ProcessInfo()
   processinfo.performExpiringActivity(withReason: "Long task") { (expired) in
      if (!expired) {
         // Run task synchronously.
      else {
         // Cancel task.

As mentioned in the documentation, the ProcessInfo code block is called a second time if the system need to suspend the process:

If your block is still executing and the system need to suspend the process, the system executes your block a second time with the expired parameter set to true. Your block must be prepared to handle this case. When the expired parameter is true, stop any in-progress tasks as quickly as possible.


Important: it’s important that the tasks are executed synchronously. When the end of the block is reached, the thread will terminate and end the execution of your task. If your tasks are asynchron, you can use a loop like shown below to wait inside the background thread until the asynchron task is finished:

// Keep background thread alive until asynchron task ends.
repeat {
} while(taskIsRunning)

General thoughts on using background tasks in iOS

A good summary of background tasks is available at

Photo by Jonathan Borba on Unsplash.

PHP ColorUtils

A neat collection of useful methods to convert colors between different color spaces is available on GitHub (MIT License). It can convert any values between RGB, HSL, CMYK, YUV and HEX colors.

I created a ready-to-use php class out of this method collection:


The methods itself are mostly self-explaining. To use the class, just include the php file into your script and you are ready to go:


The methods itself are static, they can be used like:

$hex = '#ffcc00';
$rgb = ColorUtils::hex2rgb($hex);

Which results in an array with three values (red, blue, green) in $rgb:

// [0 => 255, 1 => 204, 2 => 0]

Photo by Kelli Tungay on Unsplash

Hello World in 74 natural languages

Hello World is the example of coding which is used to show that a code snippet is running in a specific programming language. But how do you say “Hello World” in different natural languages?

Afrikaans: Hello Wêreld!
Albanian: Përshendetje Botë!
Amharic: ሰላም ልዑል!
Arabic: مرحبا بالعالم!
Armenia: Բարեւ աշխարհ!
Basque: Kaixo Mundua!
Belarussian: Прывітанне Сусвет!
Bengali: ওহে বিশ্ব!
Bulgarian: Здравей свят!
Catalan: Hola món!
Chichewa: Moni Dziko Lapansi!
Chinese: 你好世界!
Croatian: Pozdrav svijete!
Czech: Ahoj světe!
Danish: Hej Verden!
Dutch: Hallo Wereld!
English: Hello World!
Estonian: Tere maailm!
Finnish: Hei maailma!
French: Bonjour monde!
Frisian: Hallo wrâld!
Georgian: გამარჯობა მსოფლიო!
German: Hallo Welt!
Greek: Γειά σου Κόσμε!
Hausa: Sannu Duniya!
Hebrew: שלום עולם!
Hindi: नमस्ते दुनिया!
Hungarian: Helló Világ!
Icelandic: Halló heimur!
Igbo: Ndewo Ụwa!
Indonesian: Halo Dunia!
Italian: Ciao mondo!
Japanese: こんにちは世界!
Kazakh: Сәлем Әлем!
Khmer: សួស្តី​ពិភពលោក!
Kyrgyz: Салам дүйнө!
Lao: ສະ​ບາຍ​ດີ​ຊາວ​ໂລກ!
Latvian: Sveika pasaule!
Lithuanian: Labas pasauli!
Luxemburgish: Moien Welt!
Macedonian: Здраво свету!
Malay: Hai dunia!
Malayalam: ഹലോ വേൾഡ്!
Mongolian: Сайн уу дэлхий!
Myanmar: မင်္ဂလာပါကမ္ဘာလောက!
Nepali: नमस्कार संसार!
Norwegian: Hei Verden!
Pashto: سلام نړی!
Persian: سلام دنیا!
Polish: Witaj świecie!
Portuguese: Olá Mundo!
Punjabi: ਸਤਿ ਸ੍ਰੀ ਅਕਾਲ ਦੁਨਿਆ!
Romanian: Salut Lume!
Russian: Привет мир!
Scots Gaelic: Hàlo a Shaoghail!
Serbian: Здраво Свете!
Sesotho: Lefatše Lumela!
Sinhala: හෙලෝ වර්ල්ඩ්!
Slovenian: Pozdravljen svet!
Spanish: ¡Hola Mundo!
Sundanese: Halo Dunya!
Swahili: Salamu Dunia!
Swedish: Hej världen!
Tajik: Салом Ҷаҳон!
Thai: สวัสดีชาวโลก!
Turkish: Selam Dünya!
Ukrainian: Привіт Світ!
Uzbek: Salom Dunyo!
Vietnamese: Chào thế giới!
Welsh: Helo Byd!
Xhosa: Molo Lizwe!
Yiddish: העלא וועלט!
Yoruba: Mo ki O Ile Aiye!
Zulu: Sawubona Mhlaba!

Source StackExchange. Photo by Kobu Agency on Unsplash.