Class: Teletype::Paginator

Inherits:
Object
  • Object
show all
Defined in:
lib/teletype/paginator.rb

Overview

Pager divides lines of text into proper screen size and provides page suggestion based on statistics of click accuracy.

Instance Method Summary collapse

Constructor Details

#initialize(profile, text, suggest:, screen:, stats:) ⇒ Paginator

Returns a new instance of Paginator.



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# File 'lib/teletype/paginator.rb', line 9

def initialize(profile, text, suggest:, screen:, stats:)
  @screen = screen
  @stats = stats
  @suggest = suggest

  @lines = split(text, @screen.width)

  @linenum = 0
  @pagefile = File.join(profile, "page-#{Digest::MD5.hexdigest(text)}")
end

Instance Method Details

#pick(suggestions) ⇒ Object 



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# File 'lib/teletype/paginator.rb', line 41

def pick(suggestions)
  index = 0.0 # preserve the original order
  matches = ->(line) { suggestions.map { |keys| line.scan(keys).count }.sum - (index += 0.0001) }
  @lines.sort_by { |line| matches.call(line) }.last(@suggest)
end

#run ⇒ Object 



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# File 'lib/teletype/paginator.rb', line 24

def run
  prev = File.exist?(@pagefile) ? Integer(File.read(@pagefile).strip) : 0
  @lines.each_slice(@screen.height) do |lines|
    @linenum += @screen.height
    next if @linenum < prev

    Page.new(lines, @screen, @stats).run

    loop do
      suggestions = @stats.suggestions
      break if suggestions.empty?

      Page.new(pick(suggestions), @screen, @stats).run
    end
  end
end

#save ⇒ Object 



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# File 'lib/teletype/paginator.rb', line 20

def save
  File.write(@pagefile, @linenum) if @linenum.positive?
end

#split(text, length) ⇒ Object 



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# File 'lib/teletype/paginator.rb', line 47

def split(text, length)
  lines = []
  text.each_line do |line|
    line.chars.each_slice(length) do |slice|
      lines << slice.join
    end
  end
  lines
end