Class: RSpecTelemetry::Trace::Viewer::FollowController

Inherits:
Object
  • Object
show all
Defined in:
lib/rspec_telemetry/trace/viewer/follow_controller.rb

Overview

Owns “follow mode”: draining a live source into the Document, keeping the cursor parked at the tail, and advancing the pending spinner.

Constant Summary collapse

SPINNER = 
%w[| / - \\].freeze

Instance Method Summary collapse

Constructor Details

#initialize(source:, active:) ⇒ FollowController

Returns a new instance of FollowController.



11
12
13
14
15
16
 
# File 'lib/rspec_telemetry/trace/viewer/follow_controller.rb', line 11

def initialize(source:, active:)
  @source = source
  @active = active
  @stick = active
  @spin = 0
end

Instance Method Details

#active? ⇒ Boolean

Returns:

  • (Boolean) 


18
 
# File 'lib/rspec_telemetry/trace/viewer/follow_controller.rb', line 18

def active? = @active

#drain(document) ⇒ Object

Advance the spinner and fold any new source lines into the document.



35
36
37
38
39
40
41
42
 
# File 'lib/rspec_telemetry/trace/viewer/follow_controller.rb', line 35

def drain(document)
  return false unless @active

  @spin += 1
  lines = @source ? @source.drain : []
  lines.each { |line| document.apply(line) }
  !lines.empty?
end

#reset_stick(at_end:) ⇒ Object

Re-evaluate sticking after the cursor moves (e.g. App#go_to).



30
31
32
 
# File 'lib/rspec_telemetry/trace/viewer/follow_controller.rb', line 30

def reset_stick(at_end:)
  @stick = @active && at_end
end

#spinner ⇒ Object 



20
 
# File 'lib/rspec_telemetry/trace/viewer/follow_controller.rb', line 20

def  = SPINNER[@spin % SPINNER.length]

#stick(list) ⇒ Object

Keep the cursor parked at the tail while sticking.



45
46
47
 
# File 'lib/rspec_telemetry/trace/viewer/follow_controller.rb', line 45

def stick(list)
  list.to_end if @stick
end

#toggle(at_end:) ⇒ Object

Flip follow on/off; resume tail-sticking only when parked at the end.



23
24
25
26
27
 
# File 'lib/rspec_telemetry/trace/viewer/follow_controller.rb', line 23

def toggle(at_end:)
  @active = !@active
  @stick = @active && at_end
  @active
end

#wants_tick? ⇒ Boolean

Returns:

  • (Boolean) 


19
 
# File 'lib/rspec_telemetry/trace/viewer/follow_controller.rb', line 19

def wants_tick? = @active