format.js

const MENU_ID_FORMAT_MAP = {
  strongMenuItem: 'strong',
  emphasisMenuItem: 'em',
  inlineCodeMenuItem: 'inline_code',
  strikeMenuItem: 'del',
  hyperlinkMenuItem: 'link',
  imageMenuItem: 'image',
  inlineMathMenuItem: 'inline_math'
}

export const format = (win, type) => {
  if (win && win.webContents) {
    win.webContents.send('mt::editor-format-action', { type })
  }
}

// --- IPC events -------------------------------------------------------------

// NOTE: Don't use static `getMenuItemById` here, instead request the menu by
//       window id from `AppMenu` manager.

/**
 * Update format menu entires from given state.
 *
 * @param {Electron.MenuItem} applicationMenu The application menu instance.
 * @param {Object.<string, boolean>} formats A object map with selected formats.
 */
export const updateFormatMenu = (applicationMenu, formats) => {
  const formatMenuItem = applicationMenu.getMenuItemById('formatMenuItem')
  formatMenuItem.submenu.items.forEach(item => (item.checked = false))
  formatMenuItem.submenu.items
    .forEach(item => {
      if (item.id && formats[MENU_ID_FORMAT_MAP[item.id]]) {
        item.checked = true
      }
    })
}