Class: Pry::Pager::PageTracker

Inherits:
Object
  • Object
show all
Defined in:
lib/pry/pager.rb

Overview

`PageTracker` tracks output to determine whether it's likely to take up a whole page. This doesn't need to be super precise, but we can use it for `SimplePager` and to avoid invoking the system pager unnecessarily.

One simplifying assumption is that we don't need `#page?` to return `true` on the basis of an incomplete line. Long lines should be counted as multiple lines, but we don't have to transition from `false` to `true` until we see a newline.

Instance Method Summary collapse

Constructor Details

#initialize(rows, cols) ⇒ PageTracker

Returns a new instance of PageTracker


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# File 'lib/pry/pager.rb', line 203

def initialize(rows, cols)
  @rows, @cols = rows, cols
  reset
end

Instance Method Details

#page?Boolean

Returns:

  • (Boolean)

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# File 'lib/pry/pager.rb', line 219

def page?
  @row >= @rows
end

#record(str) ⇒ Object


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# File 'lib/pry/pager.rb', line 208

def record(str)
  str.lines.each do |line|
    if line.end_with? "\n"
      @row += ((@col + line_length(line) - 1) / @cols) + 1
      @col  = 0
    else
      @col += line_length(line)
    end
  end
end

#resetObject


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# File 'lib/pry/pager.rb', line 223

def reset
  @row = 0
  @col = 0
end