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.



203
204
205
206
 
# File 'lib/pry/pager.rb', line 203

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

Instance Method Details

#page? ⇒ Boolean

Returns:

  • (Boolean) 


219
220
221
 
# File 'lib/pry/pager.rb', line 219

def page?
  @row >= @rows
end

#record(str) ⇒ Object 



208
209
210
211
212
213
214
215
216
217
 
# 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

#reset ⇒ Object 



223
224
225
226
 
# File 'lib/pry/pager.rb', line 223

def reset
  @row = 0
  @col = 0
end