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* Add selector library, apply to `jdk` and `hunspell` * Make rubocop happy * Fix syntax error * jdk: Fetch version from packages * Auto update version number * hunspell: wrap with `ARGV.include?` * Fix syntax error * Make rubocop happy * jdk: use `Dir[]` * Generate options dynamically
94 lines
2.5 KiB
Ruby
94 lines
2.5 KiB
Ruby
# selector.rb: Prompt user to choose an option in a list of options
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# See packages/hunspell.rb for example usage
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require_relative 'color'
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class Selector
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@@default_prompt = {
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heading: 'There are %{total_opts} provider(s) for this package: ',
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countdown: 'Default selected in %%2.2i second(s). Enter your choice [1 = %{default}]: '
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}
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def initialize(options, prompt = @@default_prompt, timeout = 10)
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@options = options
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@timeout = timeout
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# substitute expressions in the message ("%{variable}")
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@prompt = prompt.transform_values {|p| format(p, { total_opts: @options.size, default: @options[0][:value] }) }
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end
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def show_prompt
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# show_prompt(): Show prompt based on given options
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warn "#{@prompt[:heading]}\n\n"
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@options.each_with_index do |opt, i|
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$stderr.print " #{i + 1}: #{opt[:value]}"
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$stderr.print " (#{opt[:description]})" if opt[:description]
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$stderr.print "\n"
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end
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warn "\n"
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# only show prompt when crew is running in an interactive terminal
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if $stdin.isatty
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begin
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fire_timer { Thread.kill(@io_read) }
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start_reading
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@io_read.join
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ensure
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Thread.kill(@countdown)
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end
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end
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if @io_read.nil? || @io_read[:input].to_s.chomp.empty?
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# empty input or timeout
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warn "Selected \"#{@options[0][:value]}\" by default.".yellow
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choice = 1
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elsif Integer(@io_read[:input], exception: false)&.between?(1, @options.size)
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# when input is valid (is an integer and in range)
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choice = @io_read[:input].to_i
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else
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# invalid input
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warn <<~EOT.yellow
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I don't understand "#{@io_read[:input]}". :(
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Selected "#{@options[0][:value]}" by default.
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EOT
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choice = 1
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end
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# return result
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return @options[choice - 1][:value]
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end
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private
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def fire_timer(&when_timeout)
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# fire_timer(): start a timer in separate thread
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@countdown = Thread.new do
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@timeout.downto(0).each do |remaining_time|
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# print current countdown
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$stderr.print "\r#{format(@prompt[:countdown], remaining_time)}"
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if remaining_time.zero?
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warn "\nTime expired.\n".yellow
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when_timeout.call
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else
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sleep 1
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end
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end
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end
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end
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def start_reading
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# start_reading(): read from terminal in separate thread
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@io_read = Thread.new do
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# discard any input in the input buffer
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$stdin.read_nonblock(1024)
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rescue IO::WaitReadable
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ensure
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Thread.current[:input] = $stdin.getc
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end
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end
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end
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