class RatatuiRuby::Tea::Command::Mapped

Wraps another command’s result with a transformation.

Fractal Architecture requires composition. Child fragments produce commands with their own tags. Parent fragments need those results routed back with a parent prefix. Without transformation, update functions become monolithic “God Reducers” that know about every child’s internals.

This command wraps an inner command and transforms its result message. The parent fragment delegates to the child, then intercepts the result and adds its routing prefix. Clean separation. No coupling.

Use it to compose child fragments that return their own commands.

Public Instance Methods

call (out, token)

Source

# File lib/ratatui_ruby/tea/command.rb, line 375
def call(out, token)
  inner_channel = Concurrent::Promises::Channel.new
  inner_outlet = Outlet.new(inner_channel, lifecycle: out.live)

  # Dispatch inner command
  if inner_command.respond_to?(:call)
    inner_command.call(inner_outlet, token)
  else
    raise ArgumentError, "Inner command must respond to #call"
  end

  # Transform result and send
  inner_message = inner_channel.pop
  transformed = mapper.call(inner_message)
  out.put(*transformed)
end

Executes the inner command, waits for result, and transforms it.

tea_cancellation_grace_period ()

Source

# File lib/ratatui_ruby/tea/command.rb, line 369
def tea_cancellation_grace_period
  inner_command.respond_to?(:tea_cancellation_grace_period) ?
    inner_command.tea_cancellation_grace_period : 0.1
end

Grace period delegates to inner command.