Add conferences page

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diff --git a/resources/pug/finals/conferences.pug b/resources/pug/finals/conferences.pug
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+extends /layout.pug
+
+block extra_head
+	meta(name='description', content='PhD candidate in Semitic linguistics')
+
+	style.
+		table.conferences {
+			margin-top: 1em;
+		}
+
+		table.conferences tr.year {
+			border-color: black;
+			border-style: solid;
+			border-width: 1px 0 0 0;
+		}
+
+		table.conferences tr.spacer {
+			height: .8ex;
+		}
+
+		table.conferences tr.year td {
+			padding-bottom: .4ex;
+		}
+
+		table.conferences tr.entry {
+			color: gray;
+		}
+
+		table.conferences i.fas, table.conferences i.fab {
+			margin-right: .2ex;
+		}
+
+block titleContainer
+
+block content
+	-
+		const BIKE_CARBON_FOOTPRINT_KM = 30;
+		const DOMESTIC_FLIGHT_THRESHOLD = 500;
+
+	h1 Visited conferences
+
+	p.
+		This page gives an overview of the conferences, workshops, and summer schools I have visited together with the #[strong travel carbon footprint].
+		The #[strong accomodation] I used is also listed, but not included in the carbon footprint.
+		The calculation is based on averages from #[a(href='https://ourworldindata.org/travel-carbon-footprint', target='_blank') Our World in Data].
+
+	p.
+		For #[strong biking], I counted 30g CO#[sub 2] / km as a rough estimate based on my diet.
+		#[strong Flights] shorter than 500km are counted as 'domestic' (255g / km), otherwise they are counted as short/long-haul (averaged on 153g / km).
+		Distances (when hovering a travel mode symbol) are given for one-way trip only (but the footprint is computed for all travel).
+
+	p.
+		I don't know much about computing carbon footprint.
+		#[strong Please let me know if you think something can be done better!]
+
+	p.
+		The carbon footprint per capita of the Netherlands was #[strong 9.66] t (9,660,000 g) in 2017, according to #[a(href='https://ourworldindata.org/co2/country/netherlands?country=NLD~DEU~DNK~SWE~FRA~BEL', target='_blank') Our World in Data].
+		The global average was #[strong 4.79] t (4,790,000 g) in 2016, according to #[a(href='https://www.worldometers.info/co2-emissions/co2-emissions-per-capita/', target='_blank') Worldometer].
+
+	-
+		// Accepts "Y-M-D to [[Y-]M-]D", i.e. you can leave out repeated parts in
+		// the second date. "2019-7-8 to 10" means "2019-7-8 to 2019-7-10".
+		// You can also give only one date.
+		function parse_date_range(s) {
+			s = s.split(' to ').map(d => d.split('-'));
+
+			let from = {year: s[0][0], month: s[0][1], day: s[0][2]};
+
+			// If only day or month-day is given in the second date, add year-month
+			// or year from the first date.
+			let to;
+			if (s.length == 1)
+				to = from;
+			else if (s[1].length == 1)
+				to = {year: from.year, month: from.month, day: s[1][0]};
+			else if (s[1].length == 2)
+				to = {year: from.year, month: s[1][0], day: s[1][1]};
+			else
+				to = {year: s[1][0], month: s[1][1], day: s[1][2]};
+
+			return {
+				from: new Date(from.year, from.month-1, from.day),
+				to: new Date(to.year, to.month-1, to.day)
+			};
+		}
+
+		function nr_of_days(conf) {
+			return 1 + (conf.to - conf.from) / 24 / 3600 / 1000;
+		}
+
+		// Computes footprint in grams CO2, according to
+		// https://ourworldindata.org/travel-carbon-footprint.
+		// See the explanation in the paragraph at the top of the page.
+		function compute_carbon_footprint(conf) {
+			let footprint = 0;
+
+			if (conf.bike)
+				footprint += BIKE_CARBON_FOOTPRINT_KM * conf.bike;
+			if (conf.ferry)
+				footprint += 19 * conf.ferry;
+			if (conf.plane)
+				footprint += (conf.plane < DOMESTIC_FLIGHT_THRESHOLD ? 255 : 153) * conf.plane;
+			if (conf.train)
+				footprint += 41 * conf.train;
+
+			return footprint * (conf.multiplier || 2);
+		}
+
+		function year_summary(conferences, year) {
+			conferences = conferences.filter(c => c.from.getFullYear() == year);
+
+			return {
+				conferences: conferences.length,
+				total_days: conferences.map(nr_of_days).reduce((x,y) => x + y, 0),
+				total_footprint: conferences.map(compute_carbon_footprint).reduce((x,y) => x + y, 0),
+			};
+		}
+
+		let conferences = [];
+
+	mixin conf(dates, location, distance, shorttitle, title)
+		-
+			let conf = parse_date_range(dates);
+			conf.location = location;
+			conf.distance = distance;
+			conf.shorttitle = shorttitle;
+			conf.title = title || shorttitle;
+
+			Object.assign(conf, attributes);
+
+			conf.footprint = compute_carbon_footprint(conf);
+
+			conferences.push(conf);
+
+	mixin listconferences()
+		-
+			conferences.sort((x,y) => x.from - y.from || x.to - y.to);
+			let last_year = null;
+
+		table.conferences
+			thead
+				tr
+					th Year
+					th Month
+					th Location
+					th Travel modes
+					th(colspan=2) Carbon footprint (g CO#[sub 2])
+					th Accomodation
+					th Title
+
+			- for (const conf of conferences)
+				if last_year != conf.from.getFullYear()
+					- last_year = conf.from.getFullYear();
+					- let summary = year_summary(conferences, last_year);
+					tr.spacer
+					tr.year
+						td= conf.from.getFullYear()
+						td(colspan=7).
+							#[strong= summary.conferences] conference#{summary.conferences == 1 ? '' : 's'}
+							over #[strong= summary.total_days] day#{summary.total_days == 1 ? '' : 's'},
+							for a total of #[strong= (summary.total_footprint).toLocaleString('en')]g CO#[sub 2],
+							averaging #[strong= (summary.total_footprint / summary.total_days).toLocaleString('en', {maximumFractionDigits: 0})]g CO#[sub 2] / day.
+
+				tr.entry
+					td
+
+					td(title!=conf.from.toDateString() + ' to ' + conf.to.toDateString())
+						= conf.from.toLocaleString('default', {month: 'short'})
+						if conf.from.getMonth() != conf.to.getMonth()
+							| –
+							= conf.to.toLocaleString('default', {month: 'short'})
+
+					td
+						= conf.location
+						if conf.distance
+							= ' (' + (conf.distance).toLocaleString('en') + 'km)'
+
+					td
+						if conf.bike
+							i.fas.fa-bicycle(alt='Bike', title!='Bike: ' + conf.bike + 'km')
+						if conf.ferry
+							i.fas.fa-ship(alt='Ferry', title!='Ferry: ' + conf.ferry + 'km')
+						if conf.train
+							i.fas.fa-train(alt='Train', title!='Train: ' + conf.train + 'km')
+						if conf.plane
+							i.fas.fa-plane(alt='Plane', title!='Plane: ' + conf.plane + 'km')
+
+					td.text-right= (conf.footprint).toLocaleString('en')
+
+					td.text-right= (conf.footprint / nr_of_days(conf)).toLocaleString('en', {maximumFractionDigits: 0}) + ' / day'
+
+					td
+						if conf.airbnb
+							i.fab.fa-airbnb(alt='Airbnb', title='Airbnb')
+						if conf.hotel
+							i.fas.fa-hotel(alt='Hotel', title='Hotel')
+						if conf.friendstay
+							i.fas.fa-home(alt='With a friend', title='With a friend')
+
+					td
+						a(href!=conf.url, target='_blank', title!=conf.title)!= conf.shorttitle
+
+	+conf('2017-7-10 to 21', 'Leiden', 61, 'Summer School in Languages and Linguistics', 'Leiden Summer School in Languages and Linguistics')(train=75, multiplier=20, url='https://www.universiteitleiden.nl/en/education/study-programmes/summer-schools/summer-school-in-languages-and-linguistics')
+
+	+conf('2019-7-8 to 10', 'Cambridge', 393, 'BHLAP', 'Biblical & Rabbinic Hebrew: New Perspectives in Philology & Linguistics')(bike=305, ferry=200, airbnb, url='https://www.ames.cam.ac.uk/whats-on/events-archive/biblical-rabinic-hebrew-conference')
+	+conf('2019-10-7 to 8', 'Utrecht', 59, 'CLSoR', 'Workshop on Cross-Linguistic Semantics of Reciprocals')(train=72, friendstay, url='https://rocky.sites.uu.nl/workshop-on-cross-linguistic-semantics-of-reciprocals/')
+
+	+conf('2020-3-31', 'Online', 0, '#SemiticsTwitterCoronaConference')(url='https://www.academia.edu/42297049/')
+	+conf('2020-10-11', 'Online', 0, 'Syntax Workshop')(url='https://sites.google.com/view/syntaxworkshop')
+	+conf('2020-11-29 to 12-11', 'Online', 0, 'SBL Annual', 'SBL Annual Meeting')(url='https://www.sbl-site.org/meetings/Congresses_Abstracts.aspx?MeetingId=37')
+
+	+listconferences()