opus/sys/apps/system/launcher.lua

local Config = require('config')
local UI     = require('ui')

local colors = _G.colors
local fs     = _G.fs

local config = Config.load('multishell')

local tab = UI.Tab {
	tabTitle = 'Launcher',
	description = 'Set the application launcher',
  launcherLabel = UI.Text {
    x = 3, y = 2,
    value = 'Launcher',
  },
  launcher = UI.Chooser {
    x = 13, y = 2, width = 12,
    choices = {
      { name = 'Overview', value = 'sys/apps/Overview.lua' },
      { name = 'Shell',    value = 'sys/apps/shell.lua'    },
      { name = 'Custom',   value = 'custom'                },
    },
  },
  custom = UI.TextEntry {
    x = 13, ex = -3, y = 3,
    limit = 128,
    shadowText = 'File name',
  },
  button = UI.Button {
    x = 3, y = 5,
    text = 'Update',
    event = 'update',
  },
  labelText = UI.TextArea {
    x = 3, ex = -3, y = 7,
    textColor = colors.yellow,
    value = 'Choose an application launcher',
  },
}

function tab:enable()
  local launcher = config.launcher and 'custom' or 'sys/apps/Overview.lua'

  for _, v in pairs(self.launcher.choices) do
    if v.value == config.launcher then
      launcher = v.value
      break
    end
  end

	UI.Tab.enable(self)

  self.launcher.value = launcher
  self.custom.enabled = launcher == 'custom'
end

function tab:eventHandler(event)
	if event.type == 'choice_change' then
    self.custom.enabled = event.value == 'custom'
    self:draw()

  elseif event.type == 'update' then
    local launcher

    if self.launcher.value ~= 'custom' then
      launcher = self.launcher.value
    elseif fs.exists(self.custom.value) and not fs.isDir(self.custom.value) then
      launcher = self.custom.value
    end

    if launcher then
      config.launcher = launcher
      Config.update('multishell', config)
      self:emit({ type = 'success_message', message = 'Updated' })
    else
      self:emit({ type = 'error_message', message = 'Invalid file' })
    end
  end
end

return tab