Mailspring/app/internal_packages/thread-snooze/lib/snooze-mail-label.jsx

import React, {Component} from 'react';
import PropTypes from 'prop-types'
import {FocusedPerspectiveStore} from 'nylas-exports';
import {RetinaImg, MailLabel} from 'nylas-component-kit';
import {PLUGIN_ID} from './snooze-constants';
import {snoozedUntilMessage} from './snooze-utils';


class SnoozeMailLabel extends Component {
  static displayName = 'SnoozeMailLabel';

  static propTypes = {
    thread: PropTypes.object,
  };

  static containerRequired = false;

  render() {
    const current = FocusedPerspectiveStore.current()
    const isSnoozedPerspective = (
      current.categories().length > 0 &&
      current.categories()[0].role === 'snoozed'
    )

    if (!isSnoozedPerspective) {
      return false
    }

    const {thread} = this.props;
    if (!thread.categories.find(c => c.role === 'snoozed')) {
      return false;
    }

    const metadata = thread.metadataForPluginId(PLUGIN_ID);
    if (!metadata) {
      return false;
    }
    const content = (
      <span className="snooze-mail-label">
        <RetinaImg
          name="icon-snoozed.png"
          mode={RetinaImg.Mode.ContentIsMask}
        />
        <span className="date-message">
          {snoozedUntilMessage(metadata.expiration).replace('Snoozed', '')}
        </span>
      </span>
    )
    const label = {
      displayName: content,
      isLockedCategory: () => true,
      hue: () => 259,
    }
    return (
      <MailLabel
        label={label}
        key={`snooze-message-${thread.id}`}
      />
    );
  }
}

export default SnoozeMailLabel;