saagarjha

Remove implicitly unwrapped optionals in function signatures

• Proposal: SE-NNNN
• Author: spromicky
• Status: Awaiting review
• Review manager: TBD

Introduction

Swift, in contrast with Objective-C, makes a distinction between values that may be nil and values that can never be nil through its use of Optionals. Due to the fact that Objective-C does not make this distinction, Objective-C functions that do not use the Nullability annotations are imported with parameters of the implicitly unwrapped optional type. Unfortunately, this allows users to write their own Swift code that looks like this:

saagarjha

# If you haven't already, download Conky Google Now from http://satya164.deviantart.com/art/Conky-Google-Now-366545753 and unzip it to your home folder; then copy this .conkyrc over the one you just extracted
# Requires lm-sensors and inxi (and conky) to be installed:
# sudo apt-get install lm-sensors inxi

# Adapted from these:
# http://satya164.deviantart.com/art/Conky-Google-Now-366545753
# https://gist.github.com/anonymous/6666594

# Conky Google Now style #

saagarjha

#!/bin/sh

if [ $# == 1 ]; then
	git fetch origin pull/$1/head:pr-$1
	git checkout pr-$1
elif [ $# == 2 ]; then
	git fetch $1 pull/$2/head:pr-$2
	git checkout pr-$2
else
	echo "Usage: git test-pr [remote] pr#"

saagarjha

#!/usr/local/bin/bash
# Make sure this runs on a modern bash with support for ;;& in case

shopt -s extglob

# Make sure we're in a git directory
if [ -d .git ] || git rev-parse --git-dir > /dev/null 2>&1; then
	# Print a leading space to separate from the rest of the PS1
	echo -n " "
	# Check our status relative to upstream

saagarjha

import Foundation

protocol SockAddr { }
extension sockaddr_in: SockAddr { }
extension sockaddr_in6: SockAddr { }

enum SocketAddress: CustomDebugStringConvertible {
	case ipv4(sockaddr_in)
	case ipv6(sockaddr_in6)

saagarjha

cd() {
	# Set the current directory to the 0th history item
	cd_history[0]=$PWD
	if [[ $1 == -h ]]; then
		for i in ${!cd_history[@]}; do
			echo $i: "${cd_history[$i]}"
		done
		return
	elif [[ $1 =~ ^-[0-9]+ ]]; then
		builtin cd "${cd_history[${1//-}]}" || # Remove the argument's dash

saagarjha

function postUpdatedxkcdIfNecessary() {
	var properties = PropertiesService.getUserProperties();
	
	var latestComic = JSON.parse(UrlFetchApp.fetch("http://xkcd.com/info.0.json").getContentText());
	
	if (latestComic["num"] > properties.getProperty("lastComic")) {
		var title = latestComic["title"];
		var imageURL = latestComic["img"];
		var altText = latestComic["alt"];
		var number = latestComic["num"];

saagarjha

import Foundation

let handle = dlopen("/System/Library/PrivateFrameworks/Calculate.framework/Calculate", RTLD_LAZY)
let CalculatePerformExpression = unsafeBitCast(dlsym(handle, "CalculatePerformExpression"), to:
	(@convention(c) (UnsafePointer<CChar>, Int, Int, UnsafePointer<CChar>) -> Bool).self)
let expression = Array(CommandLine.arguments.dropFirst()).joined(separator: " ")
let answer = Array<CChar>(repeating: 0, count: 100)
if CalculatePerformExpression(expression, 16, 1, answer) {
	print(String(cString: answer))
}

saagarjha

//
// Logic necessary to implement a "closing handler" for a NSDocument
//
// This is inspired by: 
// - https://stackoverflow.com/questions/49343307/best-practice-to-implement-canclosewithdelegateshouldclosecontextinfo
// - https://github.com/keith/radars/blob/master/NSDocumentSwiftAnnotations/NSDocumentSwiftAnnotations/Document.swift
//   Keith's supporting documentation for his radar submission: http://www.openradar.me/33422662  
// Documentation:
// - https://developer.apple.com/library/content/releasenotes/AppKit/RN-AppKitOlderNotes/
//   Paragraph called: "Advice for Overriders of Methods that Follow the delegate:didSomethingSelector:contextInfo: Pattern"

saagarjha

#include <string.h>

int overridden_strncasecmp(const char *s1, const char *s2, size_t n) {
	if (n != 6 || strncmp(s2, "bright", n)) {
		return strncasecmp(s1, s2, n);
	} else {
		return !0;
	}
}