Module: Capistrano::DataPlaneApi::TerminalPrintLoop

Defined in:
lib/capistrano/data_plane_api/terminal_print_loop.rb

Overview

Provides a method that renders strings in a terminal with the given interval.

Class Method Summary collapse

Class Method Details

.call(interval: 2, &_block) ⇒ Object

Calls the passed block in an endless loop with a given interval between calls. It prints the ‘String` returned from the block and clears it before another frame is printed.

: (Integer) { (String) -> Object } -> void



19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
 
# File 'lib/capistrano/data_plane_api/terminal_print_loop.rb', line 19

def call(interval: 2, &_block)
  previous_line_count = 0
  previous_max_line_length = 0
  loop do
    content = ::String.new
    yielded = yield(content)

    print ::TTY::Cursor.clear_lines(previous_line_count + 1)

    content = yielded if yielded.is_a?(::String) && content.empty?
    line_count = 0
    max_line_length = 0
    content.each_line do |line|
      line_count += 1
      max_line_length = line.length if line.length > max_line_length
    end
    previous_line_count = line_count
    previous_max_line_length = max_line_length

    puts(content)
    sleep(interval)
  end
end