app/javascript/mastodon/components/relative_timestamp.js

   1 import React from 'react';
   2 import { injectIntl, defineMessages } from 'react-intl';
   3 import PropTypes from 'prop-types';
   4
   5 const messages = defineMessages({
   6   just_now: { id: 'relative_time.just_now', defaultMessage: 'now' },
   7   seconds: { id: 'relative_time.seconds', defaultMessage: '{number}s' },
   8   minutes: { id: 'relative_time.minutes', defaultMessage: '{number}m' },
   9   hours: { id: 'relative_time.hours', defaultMessage: '{number}h' },
  10   days: { id: 'relative_time.days', defaultMessage: '{number}d' },
  11 });
  12
  13 const dateFormatOptions = {
  14   hour12: false,
  15   year: 'numeric',
  16   month: 'short',
  17   day: '2-digit',
  18   hour: '2-digit',
  19   minute: '2-digit',
  20 };
  21
  22 const shortDateFormatOptions = {
  23   month: 'numeric',
  24   day: 'numeric',
  25 };
  26
  27 const SECOND = 1000;
  28 const MINUTE = 1000 * 60;
  29 const HOUR   = 1000 * 60 * 60;
  30 const DAY    = 1000 * 60 * 60 * 24;
  31
  32 const MAX_DELAY = 2147483647;
  33
  34 const selectUnits = delta => {
  35   const absDelta = Math.abs(delta);
  36
  37   if (absDelta < MINUTE) {
  38     return 'second';
  39   } else if (absDelta < HOUR) {
  40     return 'minute';
  41   } else if (absDelta < DAY) {
  42     return 'hour';
  43   }
  44
  45   return 'day';
  46 };
  47
  48 const getUnitDelay = units => {
  49   switch (units) {
  50   case 'second':
  51     return SECOND;
  52   case 'minute':
  53     return MINUTE;
  54   case 'hour':
  55     return HOUR;
  56   case 'day':
  57     return DAY;
  58   default:
  59     return MAX_DELAY;
  60   }
  61 };
  62
  63 @injectIntl
  64 export default class RelativeTimestamp extends React.Component {
  65
  66   static propTypes = {
  67     intl: PropTypes.object.isRequired,
  68     timestamp: PropTypes.string.isRequired,
  69   };
  70
  71   state = {
  72     now: this.props.intl.now(),
  73   };
  74
  75   shouldComponentUpdate (nextProps, nextState) {
  76     // As of right now the locale doesn't change without a new page load,
  77     // but we might as well check in case that ever changes.
  78     return this.props.timestamp !== nextProps.timestamp ||
  79       this.props.intl.locale !== nextProps.intl.locale ||
  80       this.state.now !== nextState.now;
  81   }
  82
  83   componentWillReceiveProps (nextProps) {
  84     if (this.props.timestamp !== nextProps.timestamp) {
  85       this.setState({ now: this.props.intl.now() });
  86     }
  87   }
  88
  89   componentDidMount () {
  90     this._scheduleNextUpdate(this.props, this.state);
  91   }
  92
  93   componentWillUpdate (nextProps, nextState) {
  94     this._scheduleNextUpdate(nextProps, nextState);
  95   }
  96
  97   componentWillUnmount () {
  98     clearTimeout(this._timer);
  99   }
 100
 101   _scheduleNextUpdate (props, state) {
 102     clearTimeout(this._timer);
 103
 104     const { timestamp }  = props;
 105     const delta          = (new Date(timestamp)).getTime() - state.now;
 106     const unitDelay      = getUnitDelay(selectUnits(delta));
 107     const unitRemainder  = Math.abs(delta % unitDelay);
 108     const updateInterval = 1000 * 10;
 109     const delay          = delta < 0 ? Math.max(updateInterval, unitDelay - unitRemainder) : Math.max(updateInterval, unitRemainder);
 110
 111     this._timer = setTimeout(() => {
 112       this.setState({ now: this.props.intl.now() });
 113     }, delay);
 114   }
 115
 116   render () {
 117     const { timestamp, intl } = this.props;
 118
 119     const date  = new Date(timestamp);
 120     const delta = this.state.now - date.getTime();
 121
 122     let relativeTime;
 123
 124     if (delta < 10 * SECOND) {
 125       relativeTime = intl.formatMessage(messages.just_now);
 126     } else if (delta < 3 * DAY) {
 127       if (delta < MINUTE) {
 128         relativeTime = intl.formatMessage(messages.seconds, { number: Math.floor(delta / SECOND) });
 129       } else if (delta < HOUR) {
 130         relativeTime = intl.formatMessage(messages.minutes, { number: Math.floor(delta / MINUTE) });
 131       } else if (delta < DAY) {
 132         relativeTime = intl.formatMessage(messages.hours, { number: Math.floor(delta / HOUR) });
 133       } else {
 134         relativeTime = intl.formatMessage(messages.days, { number: Math.floor(delta / DAY) });
 135       }
 136     } else {
 137       relativeTime = intl.formatDate(date, shortDateFormatOptions);
 138     }
 139
 140     return (
 141       <time dateTime={timestamp} title={intl.formatDate(date, dateFormatOptions)}>
 142         {relativeTime}
 143       </time>
 144     );
 145   }
 146
 147 }