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 {SNOOZE_CATEGORY_NAME, PLUGIN_ID} from './snooze-constants';
import SnoozeUtils 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].displayName === SNOOZE_CATEGORY_NAME
    )

    if (!isSnoozedPerspective) {
      return false
    }

    const {thread} = this.props;
    if (thread.categories.find(c => c.displayName === SNOOZE_CATEGORY_NAME)) {
      let metadata = null;
      for (const msg of thread.__messages) {
        metadata = msg.metadataForPluginId(PLUGIN_ID);
        if (metadata) {
          break;
        }
      }

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

export default SnoozeMailLabel;