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corona.js
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corona.js
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const fetch = require('node-fetch'),
{parse} = require('papaparse'),
markdown_table = require('markdown-table'),
cli_table = require('table').table,
chalk = require('chalk'),
chart = require('asciichart'),
{maps, normalize_state} = require('./states');
async function get_corona_data() {
const data = await Promise.all(['confirmed', 'deaths'].map(t => {
const url = [
'https://raw.githubusercontent.com',
'CSSEGISandData',
'COVID-19',
'master',
'csse_covid_19_data',
'csse_covid_19_time_series',
`time_series_covid19_${t}_US.csv`,
].join('/'),
csv = fetch(url)
.then(r => {
if (!r.ok)
throw new Error(`An error occurred retrieving ${url}`);
else
return r.text();
})
.then(t => t.trim())
.then(csv => parse(csv, {header: true}).data);
return Promise.all([t, csv]);
}));
return Object.fromEntries(data);
}
const delta = '∆',
c1 = `Confirmed ${delta} 1 Day`,
c7 = `Confirmed ${delta} 7 Day`,
c30 = `Confirmed ${delta} 30 Day`,
d1 = `Deaths ${delta} 1 Day`,
d7 = `Deaths ${delta} 7 Day`,
d30 = `Deaths ${delta} 30 Day`;
const int = n => Number.parseInt(n) || 0;
function select(data, state) {
const dates = Object.keys(data.confirmed[0]).slice(-31),
last_update = dates[dates.length - 1],
one_day = dates[dates.length - 2],
seven_day = dates[dates.length - 8],
thirty_day = dates[0],
blank = (k, v) => ({
[k]: v,
Confirmed: 0,
[c1]: 0,
[c7]: 0,
[c30]: 0,
Deaths: 0,
[d1]: 0,
[d7]: 0,
[d30]: 0,
'Last Update': last_update,
}),
selected = Object.values(Object.entries(data)
.reduce((a, [stat, data_set]) => {
const type = state ? 'County' : 'State',
csv_key = state ? 'Admin2' : 'Province_State';
if (!a.Total)
a.Total = blank(type, 'Total');
const keys = (stat === 'confirmed')
?
['Confirmed', c1, c7, c30]
:
['Deaths', d1, d7, d30];
data_set
.filter(row => row.Province_State === state || !state)
.forEach(row => {
if (!a[row[csv_key]])
a[row[csv_key]] = blank(type, row[csv_key]);
for (const k of ['Total', row[csv_key]])
[
last_update,
one_day,
seven_day,
thirty_day,
].forEach((date, i) => a[k][keys[i]] += int(row[date]));
});
return a;
}, {}));
for (const i of Object.keys(selected))
for (const j of [c1, c7, c30, d1, d7, d30])
selected[i][j] = selected[i][j.split(' ')[0]] - selected[i][j];
return selected.sort((a, b) => b.Confirmed - a.Confirmed);
}
const shades = [
...Array(100).fill(0).map((_, i) => {
const gb = Math.round(255 * (100 - i) / 100).toString(16).padStart(2, 0).toUpperCase();
return `FF${gb}${gb}`;
}),
],
shader = max => v => (v < 1) ? 'FFFFFF' : shades[Math.min(Math.floor(v / (max / 100)), 99)];
function average_shade(shades) {
const rgb = [0, 0, 0];
for (const shade of shades)
shade.match(/.{2}/g).forEach((color, i) => rgb[i] += Buffer.from(color, 'hex')[0]);
return rgb
.map(c => Buffer.of(Math.round(c / shades.length)).toString('hex').toUpperCase())
.join('');
}
function map(data) {
const shade = shader(select(data)[1].Confirmed),
{usa} = maps,
states = Object.keys(maps).filter(k => k !== 'usa'),
state_shades = states.reduce((a, c) => ({
...a,
[c]: shade(select(data, normalize_state(c))[0].Confirmed),
}), {}),
is_empty_unicode = c => !(c.trim()) || c.charCodeAt(0) === 10240,
empty_color = '2B2B2b';
return cli_table([
['Confirmed Cases Heat Map'],
[
usa.map((row, i) => {
const px = [...row];
return px.map((p, j) => {
if (is_empty_unicode(p))
return chalk.hex(empty_color)(p);
const states_that_have_pixel = states.filter(s => maps[s][i][j] && !is_empty_unicode(maps[s][i][j])),
shades = states_that_have_pixel.map(s => state_shades[s]);
return chalk.hex(shades.length ? average_shade(shades) : empty_color)(p);
}).join('');
}).join('\n'),
],
]);
}
function graphs(data, state) {
const keys = Object.keys(data.confirmed[0]),
dates = keys.filter(k => k.match(/^\d{1,2}\/\d{1,2}\/\d{2}$/)),
padding = 10,
n_dates = 100,
chart_format = {
height: 20,
format(x) {
return Math.floor(Number(x)).toLocaleString().padStart(padding).slice(-padding);
},
},
time_series_data = Object.keys(data).reduce((a, c) => {
const data_set = state ? data[c].filter(row => row.Province_State === state) : data[c],
daily_totals = dates.map(d => data_set.map(row => Number(row[d])).reduce((a, b) => a + b));
a[c] = daily_totals.map((t, i) => i ? t - daily_totals[i - 1] : t).slice(-n_dates);
return a;
}, {});
return Object.keys(time_series_data).map(k => {
const shade = shader(Math.max(...time_series_data[k])),
plot = chart.plot(time_series_data[k], chart_format).split('\n')
.map(line => {
const [total, graph] = line.split(/[┼┤]/),
numeric_total = Number(total.replace(/,/g, ''));
return line.replace(graph, chalk.hex(shade(numeric_total))(graph));
}).join('\n');
return cli_table([
[
`New ${k === 'confirmed' ? 'Confirmed Cases' : 'Deaths'} per Day - ${
[dates.length - n_dates, dates.length - 1]
.map(i => new Date(dates[i]).toLocaleDateString()).join(' through ')
}`,
],
[plot],
]);
}).join('\n');
}
const is_number = v => typeof v === 'number';
function display_data(data, is_tty) {
const table = is_tty ? cli_table : markdown_table,
keys = Object.keys(data[0]),
values = data.map(Object.values),
shaders = values[0].map((v, i) => is_number(v)
? shader(Math.max(...values.slice(1).map(row => row[i])))
: v => v);
return table(
[keys.map(k => k.includes(delta) ? delta + k.split(delta)[1] : k)]
.concat(values.map(row => row.map((v, i) => {
if (!is_number(v))
return v;
const formatted = v.toLocaleString();
return is_tty ? chalk.hex(shaders[i](v))(formatted) : formatted;
}))),
).trim();
}
module.exports = {
display_data,
get_corona_data,
graphs,
map,
select,
shader,
};