hborders’s gists

hborders / NamedParams.java

Created November 27, 2021 00:02

Generates named parameters for a constructor using a chain of interfaces

	import java.lang.reflect.Constructor;
	import java.lang.reflect.InvocationHandler;
	import java.lang.reflect.Method;
	import java.lang.reflect.Proxy;
	import java.util.ArrayList;
	import java.util.Arrays;
	import java.util.List;
	import java.util.Objects;

	import javax.annotation.Nonnull;

hborders / LaunchBrowserActivity.kt

Created July 1, 2020 16:05

	fun launchBrowser(context: Context, uri: Uri?) {
	val browserIntent = Intent(Intent.ACTION_VIEW).apply { data = uri }
	val browseActivities = context.packageManager.queryIntentActivities(browserIntent, PackageManager.MATCH_DEFAULT_ONLY)
	for (info in browseActivities) {
	if (info.activityInfo.packageName != context.packageName) {
	browserIntent.setPackage(info.activityInfo.packageName)
	try {
	context.startActivity(browserIntent)
	break
	} catch (e: ActivityNotFoundException) {

hborders / AssertFailsWith.java

Last active April 30, 2019 14:54

https://twitter.com/jessewilson/status/1123055645824028672 in Java

	public class AssertFailsWith {
	public interface RunnableThatThrows {
	void run() throws Throwable;
	}
	public static <T extends Throwable> void assertFailsWith(Class<T> throwableClass, RunnableThatThrows runnable) {
	try {
	runnable.run();
	fail();
	} catch (Throwable throwable) {
	assertTrue(throwableClass.isInstance(throwable));

hborders / CompactDecimalFormatTest.java

Last active March 16, 2019 21:10

Demonstrates that CompactDecimalFormat#setMaximumFractionDigits and CompactDecimalFormat#setMaximumIntegerDigits don't work on Android API 24, but work on Android API 28.

	import android.icu.text.CompactDecimalFormat;
	import androidx.test.runner.AndroidJUnit4;
	import org.junit.Test;
	import org.junit.runner.RunWith;
	import java.util.Locale;
	import static org.junit.Assert.assertEquals;

	@RunWith(AndroidJUnit4.class)
	public class CompactDecimalFormatTest {

hborders / move-subscription-after.sql

Last active March 1, 2019 06:22

Moves a subscription row after a given reference subscription row

	/*
	Moves moving_id after reference_id by finding the next row after
	reference_id and setting moving_id.sort to be the midpoint of
	reference_id.sort and next_reference_id.sort
	*/
	UPDATE subscription
	SET sort = (
	CASE WHEN (
	/*
	Get the first sort value after the reference_id

hborders / Heath-C-Java-Apple-Android.opml

Created February 3, 2019 06:26

An OPML of all the C, Java, Apple, and Android feeds I follow in Feedly.

	<?xml version="1.0" encoding="UTF-8"?>

	<opml version="1.0">
	<head>
	<title>Heath's C, Java, Apple, and Android feeds</title>
	</head>
	<body>
	<outline text="C" title="C">
	<outline type="rss" text="zeuxcg.org" title="zeuxcg.org" xmlUrl="http://zeuxcg.org/feed/" htmlUrl="http://zeuxcg.org"/>
	<outline type="rss" text="Krister Walfridsson’s blog" title="Krister Walfridsson’s blog" xmlUrl="http://kristerw.blogspot.com/feeds/posts/default" htmlUrl="https://kristerw.blogspot.com/"/>

hborders / KotlinExtensions.kt

Created September 27, 2018 21:23

Some confusion over Kotlin extension methods

	open class D {}
	class D1: D() {}

	fun D.foo() {
	println("D.foo")
	}

	// this seems like an override, but isn't
	// It's good that the compiler doesn't let
	// me add `override`, but it's still not clear

hborders / GenericIsKindOfClass.m

Created October 23, 2017 14:27

How to use Objective-C Generics with -isKindOfClass:

	#import "MyNonClusteredClass.h"

	@interface GenericIsKindOfClass<ObjectType : MyNonClusteredClass *> : NSObject

	+ (instancetype _Nonnull)new NS_UNAVAILABLE;
	- (instancetype _Nonnull)init NS_UNAVAILABLE;
	- (instancetype _Nonnull)initWithInstanceOfObjectType:(ObjectType _Nonnull)instanceOfObjectType NS_DESIGNATED_INITIALIZER;

	- (ObjectType _Nullable)typeSafeDowncastOrNil:(NSObject * _Nonnull)object;

hborders / BadUnpack.m

Created March 13, 2017 19:08

Trying to unpack the wrong distinct values from a sum type

	static void badPrintExample(Example * _Nonnull example) {
	[example switchFoo:^(ExampleBar * _Nonnull bar_) {
	// ^
	// error: incompatible block pointer types sending 'void (^)(ExampleBar * _Nonnull __strong)' to parameter of type 'void (^ _Nonnull)(ExampleFoo * _Nonnull __strong)'
	NSLog(@"Bar: %@, %@", @(bar_.b), @(bar_.c));
	}
	bar:^(ExampleFoo * _Nonnull foo_) {
	// ^
	// error: incompatible block pointer types sending 'void (^)(ExampleFoo * _Nonnull __strong)' to parameter of type 'void (^ _Nonnull)(ExampleBar * _Nonnull __strong)'
	NSLog(@"Foo: %@, %@", foo_.f, foo_.g);

hborders / BadInstantiation.m

Created March 13, 2017 19:06

Trying to instantiate a distinct type of a sum type with the wrong parameters

	- (void)testWrongValues {
	Example * _Nonnull fooExample = [[ExampleFoo alloc] initWithB:2 c:3];
	// ^
	// error: no visible @interface for 'ExampleFoo' declares the selector 'initWithB:c:'
	Example * _Nonnull barExample = [[ExampleBar alloc] initWithF:@"foo" g:@"goo"];
	// ^
	// error: no visible @interface for 'ExampleBar' declares the selector 'initWithF:g:'
	}

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