Date text formatter for Copied

Dates.js

// there are two parts to this text formatter. Both draw heavily from
// the date calculation snippets created by Brett Terpstra - see
// https://brettterpstra.com/2015/06/01/textexpander-5-javascript-snippets/

// part 1 - the date library
// strftime for JS <http://hacks.bluesmoon.info/strftime/>
Date.prototype.locale = 'en-GB';
Date.ext = {};
Date.ext.util = {};

Date.ext.util.xPad=function(x, pad, r)
{
	if(typeof(r) == 'undefined')
	{
		r=10;
	}
	for( ; parseInt(x, 10)<r && r>1; r/=10)
		x = pad.toString() + x;
	return x.toString();
};

Date.ext.locales = { };
Date.ext.locales.en = {
	a: ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'],
	A: ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'],
	b: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'],
	B: ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'],
	c: '%a %d %b %Y %T %Z',
	p: ['AM', 'PM'],
	P: ['am', 'pm'],
	x: '%d/%m/%y',
	X: '%T'
};
Date.ext.locales['en-US'] = Date.ext.locales.en;
Date.ext.locales['en-US'].c = '%a %d %b %Y %r %Z';
Date.ext.locales['en-US'].x = '%D';
Date.ext.locales['en-US'].X = '%r';
Date.ext.locales['en-GB'] = Date.ext.locales.en;
Date.ext.locales['en-AU'] = Date.ext.locales['en-GB'];

Date.ext.formats = {
	a: function(d) { return Date.ext.locales[d.locale].a[d.getDay()]; },
	A: function(d) { return Date.ext.locales[d.locale].A[d.getDay()]; },
	b: function(d) { return Date.ext.locales[d.locale].b[d.getMonth()]; },
	B: function(d) { return Date.ext.locales[d.locale].B[d.getMonth()]; },
	c: 'toLocaleString',
	C: function(d) { return Date.ext.util.xPad(parseInt(d.getFullYear()/100, 10), 0); },
	d: ['getDate', '0'],
	e: ['getDate', ' '],
	g: function(d) { return Date.ext.util.xPad(parseInt(Date.ext.util.G(d)/100, 10), 0); },
	G: function(d) {
			var y = d.getFullYear();
			var V = parseInt(Date.ext.formats.V(d), 10);
			var W = parseInt(Date.ext.formats.W(d), 10);

			if(W > V) {
				y++;
			} else if(W===0 && V>=52) {
				y--;
			}

			return y;
		},
	H: ['getHours', '0'],
	I: function(d) { var I=d.getHours()%12; return Date.ext.util.xPad(I===0?12:I, 0); },
	j: function(d) {
			var ms = d - new Date('' + d.getFullYear() + '/1/1 GMT');
			ms += d.getTimezoneOffset()*60000;
			var doy = parseInt(ms/60000/60/24, 10)+1;
			return Date.ext.util.xPad(doy, 0, 100);
		},
	m: function(d) { return Date.ext.util.xPad(d.getMonth()+1, 0); },
	M: ['getMinutes', '0'],
	p: function(d) { return Date.ext.locales[d.locale].p[d.getHours() >= 12 ? 1 : 0 ]; },
	P: function(d) { return Date.ext.locales[d.locale].P[d.getHours() >= 12 ? 1 : 0 ]; },
	S: ['getSeconds', '0'],
	u: function(d) { var dow = d.getDay(); return dow===0?7:dow; },
	U: function(d) {
			var doy = parseInt(Date.ext.formats.j(d), 10);
			var rdow = 6-d.getDay();
			var woy = parseInt((doy+rdow)/7, 10);
			return Date.ext.util.xPad(woy, 0);
		},
	V: function(d) {
			var woy = parseInt(Date.ext.formats.W(d), 10);
			var dow1_1 = (new Date('' + d.getFullYear() + '/1/1')).getDay();
			// First week is 01 and not 00 as in the case of %U and %W,
			// so we add 1 to the final result except if day 1 of the year
			// is a Monday (then %W returns 01).
			// We also need to subtract 1 if the day 1 of the year is 
			// Friday-Sunday, so the resulting equation becomes:
			var idow = woy + (dow1_1 > 4 || dow1_1 <= 1 ? 0 : 1);
			if(idow == 53 && (new Date('' + d.getFullYear() + '/12/31')).getDay() < 4)
			{
				idow = 1;
			}
			else if(idow === 0)
			{
				idow = Date.ext.formats.V(new Date('' + (d.getFullYear()-1) + '/12/31'));
			}

			return Date.ext.util.xPad(idow, 0);
		},
	w: 'getDay',
	W: function(d) {
			var doy = parseInt(Date.ext.formats.j(d), 10);
			var rdow = 7-Date.ext.formats.u(d);
			var woy = parseInt((doy+rdow)/7, 10);
			return Date.ext.util.xPad(woy, 0, 10);
		},
	y: function(d) { return Date.ext.util.xPad(d.getFullYear()%100, 0); },
	Y: 'getFullYear',
	z: function(d) {
			var o = d.getTimezoneOffset();
			var H = Date.ext.util.xPad(parseInt(Math.abs(o/60), 10), 0);
			var M = Date.ext.util.xPad(o%60, 0);
			return (o>0?'-':'+') + H + M;
		},
	Z: function(d) { return d.toString().replace(/^.*\(([^)]+)\)$/, '$1'); },
	'%': function(d) { return '%'; }
};
Date.ext.aggregates = {
	c: 'locale',
	D: '%m/%d/%y',
	h: '%b',
	n: '\n',
	r: '%I:%M:%S %p',
	R: '%H:%M',
	t: '\t',
	T: '%H:%M:%S',
	x: 'locale',
	X: 'locale'
};
Date.ext.aggregates.z = Date.ext.formats.z(new Date());
Date.ext.aggregates.Z = Date.ext.formats.Z(new Date());
Date.ext.unsupported = { };
Date.prototype.strftime=function(fmt)
{
	if(!(this.locale in Date.ext.locales))
	{
		if(this.locale.replace(/-[a-zA-Z]+$/, '') in Date.ext.locales)
		{
			this.locale = this.locale.replace(/-[a-zA-Z]+$/, '');
		}
		else
		{
			this.locale = 'en-GB';
		}
	}

	var d = this;
	while(fmt.match(/%[cDhnrRtTxXzZ]/))
	{
		fmt = fmt.replace(/%([cDhnrRtTxXzZ])/g, function(m0, m1)
				{
					var f = Date.ext.aggregates[m1];
					return (f == 'locale' ? Date.ext.locales[d.locale][m1] : f);
				});
	}

	var str = fmt.replace(/%([aAbBCdegGHIjmMpPSuUVwWyY%])/g, function(m0, m1) 
			{
				var f = Date.ext.formats[m1];
				if(typeof(f) == 'string') {
					return d[f]();
				} else if(typeof(f) == 'function') {
					return f.call(d, d);
				} else if(typeof(f) == 'object' && typeof(f[0]) == 'string') {
					return Date.ext.util.xPad(d[f[0]](), f[1]);
				} else {
					return m1;
				}
			});
	d=null;
	return str;
};


function getNextDay(day, resetTime){
	day = day.slice(0,3).toLowerCase();
	var days = {
		sun: 0, mon: 1, tue: 2,
		wed: 3, thu: 4, fri: 5, sat: 6
	};

	var dayIndex = days[day];
	if (dayIndex < 0 || dayIndex > 6) {
		throw new Error('"' + day + '" is not a valid input.');
	}

	var returnDate = new Date();
	var returnDay = returnDate.getDay();
	if (dayIndex !== returnDay) {
		returnDate.setDate(returnDate.getDate() + (dayIndex + (7 - returnDay)) % 7);
	} else {
		returnDate.setDate(returnDate.getDate() + 7);
	}

	if (resetTime) {
		returnDate.setHours(0);
		returnDate.setMinutes(0);
		returnDate.setSeconds(0);
		returnDate.setMilliseconds(0);
	}
	return returnDate;
}


// part 2:
// convert date strings in Copied clippings to dates

// Return true if the clipping can be reformatted with this script.
// updated to avoid showing the formatter where it's not relevant

var validDates = ["Today", "Tomorrow", "Next Monday", "Next Tuesday", "Next Wednesday", "Next Thursday", "Next Friday", 
"Next Saturday", "Next Sunday", "Yesterday"]

function canFormat(clipping) {
	return validDates.indexOf(clipping.text) > -1	
}

// Process data and return a new/updated clipping object or a string.

function format(clipping) {
		var fmt = '%Y-%m-%d';
		var today = new Date();
		var tomorrow = new Date(today.getTime() + (24 * 60 * 60 * 1000));
		var yesterday = new Date(today.getTime() - (24 * 60 * 60 * 1000)); 
	switch(clipping.text) {
	case "Today":
	case "today":
		text = today.strftime(fmt);
		break;
	case "Tomorrow":
		text = tomorrow.strftime(fmt);
		break;
	case "Yesterday":
		text = yesterday.strftime(fmt);
		break;
	case "Next Monday":
		var day = 'Mon'
		var nextDay = getNextDay(day, true);
		text = nextDay. strftime(fmt);
		break;
	case "Next Tuesday":
		var day = 'Tues'
		var nextDay = getNextDay(day, true);
		text = nextDay. strftime(fmt);
		break;
	case "Next Wednesday":
		var day = 'Weds'
		var nextDay = getNextDay(day, true);
		text = nextDay. strftime(fmt);
		break;
	case "Next Thursday":
		var day = 'Thur'
		var nextDay = getNextDay(day, true);
		text = nextDay. strftime(fmt);
		break;
	case "Next Friday":
		var day = 'Fri'
		var nextDay = getNextDay(day, true);
		text = nextDay. strftime(fmt);
		break;
	case "Next Saturday":
		var day = 'Sat'
		var nextDay = getNextDay(day, true);
		text = nextDay. strftime(fmt);
		break;
	case "Next Sunday":
		var day = 'Sun'
		var nextDay = getNextDay(day, true);
		text = nextDay. strftime(fmt);
		break;
	default:
		text = "I have never heard of that date...";
}
		return text
}