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160 lines
4.2 KiB
160 lines
4.2 KiB
import React from 'react';
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import { injectIntl, defineMessages } from 'react-intl';
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import PropTypes from 'prop-types';
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const messages = defineMessages({
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just_now: { id: 'relative_time.just_now', defaultMessage: 'now' },
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seconds: { id: 'relative_time.seconds', defaultMessage: '{number}s' },
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minutes: { id: 'relative_time.minutes', defaultMessage: '{number}m' },
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hours: { id: 'relative_time.hours', defaultMessage: '{number}h' },
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days: { id: 'relative_time.days', defaultMessage: '{number}d' },
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});
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const dateFormatOptions = {
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hour12: false,
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year: 'numeric',
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month: 'short',
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day: '2-digit',
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hour: '2-digit',
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minute: '2-digit',
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};
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const shortDateFormatOptions = {
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month: 'short',
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day: 'numeric',
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};
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const SECOND = 1000;
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const MINUTE = 1000 * 60;
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const HOUR = 1000 * 60 * 60;
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const DAY = 1000 * 60 * 60 * 24;
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const MAX_DELAY = 2147483647;
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const selectUnits = delta => {
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const absDelta = Math.abs(delta);
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if (absDelta < MINUTE) {
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return 'second';
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} else if (absDelta < HOUR) {
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return 'minute';
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} else if (absDelta < DAY) {
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return 'hour';
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}
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return 'day';
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};
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const getUnitDelay = units => {
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switch (units) {
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case 'second':
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return SECOND;
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case 'minute':
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return MINUTE;
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case 'hour':
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return HOUR;
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case 'day':
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return DAY;
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default:
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return MAX_DELAY;
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}
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};
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export const timeAgoString = (intl, date, now, year) => {
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const delta = now - date.getTime();
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let relativeTime;
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if (delta < 10 * SECOND) {
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relativeTime = intl.formatMessage(messages.just_now);
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} else if (delta < 7 * DAY) {
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if (delta < MINUTE) {
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relativeTime = intl.formatMessage(messages.seconds, { number: Math.floor(delta / SECOND) });
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} else if (delta < HOUR) {
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relativeTime = intl.formatMessage(messages.minutes, { number: Math.floor(delta / MINUTE) });
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} else if (delta < DAY) {
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relativeTime = intl.formatMessage(messages.hours, { number: Math.floor(delta / HOUR) });
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} else {
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relativeTime = intl.formatMessage(messages.days, { number: Math.floor(delta / DAY) });
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}
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} else if (date.getFullYear() === year) {
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relativeTime = intl.formatDate(date, shortDateFormatOptions);
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} else {
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relativeTime = intl.formatDate(date, { ...shortDateFormatOptions, year: 'numeric' });
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}
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return relativeTime;
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};
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@injectIntl
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export default class RelativeTimestamp extends React.Component {
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static propTypes = {
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intl: PropTypes.object.isRequired,
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timestamp: PropTypes.string.isRequired,
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year: PropTypes.number.isRequired,
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};
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state = {
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now: this.props.intl.now(),
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};
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static defaultProps = {
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year: (new Date()).getFullYear(),
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};
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shouldComponentUpdate (nextProps, nextState) {
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// As of right now the locale doesn't change without a new page load,
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// but we might as well check in case that ever changes.
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return this.props.timestamp !== nextProps.timestamp ||
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this.props.intl.locale !== nextProps.intl.locale ||
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this.state.now !== nextState.now;
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}
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componentWillReceiveProps (nextProps) {
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if (this.props.timestamp !== nextProps.timestamp) {
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this.setState({ now: this.props.intl.now() });
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}
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}
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componentDidMount () {
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this._scheduleNextUpdate(this.props, this.state);
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}
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componentWillUpdate (nextProps, nextState) {
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this._scheduleNextUpdate(nextProps, nextState);
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}
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componentWillUnmount () {
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clearTimeout(this._timer);
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}
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_scheduleNextUpdate (props, state) {
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clearTimeout(this._timer);
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const { timestamp } = props;
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const delta = (new Date(timestamp)).getTime() - state.now;
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const unitDelay = getUnitDelay(selectUnits(delta));
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const unitRemainder = Math.abs(delta % unitDelay);
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const updateInterval = 1000 * 10;
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const delay = delta < 0 ? Math.max(updateInterval, unitDelay - unitRemainder) : Math.max(updateInterval, unitRemainder);
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this._timer = setTimeout(() => {
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this.setState({ now: this.props.intl.now() });
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}, delay);
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}
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render () {
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const { timestamp, intl, year } = this.props;
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const date = new Date(timestamp);
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const relativeTime = timeAgoString(intl, date, this.state.now, year);
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return (
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<time dateTime={timestamp} title={intl.formatDate(date, dateFormatOptions)}>
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{relativeTime}
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</time>
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);
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}
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}
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