class Pry::Pager::SystemPager
`SystemPager` buffers output until we're pretty sure it's at least a page long, then invokes an external pager and starts streaming output to it. If `#close` is called before then, it just prints out the buffered content.
Public Class Methods
available?()
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# File lib/pry/pager.rb, line 142 def self.available? if @system_pager.nil? @system_pager = begin pager_executable = default_pager.split(' ').first if Helpers::Platform.windows? || Helpers::Platform.windows_ansi? `where /Q #{pager_executable}` else `which #{pager_executable}` end $CHILD_STATUS.success? rescue StandardError false end else @system_pager end end
default_pager()
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# File lib/pry/pager.rb, line 130 def self.default_pager pager = Pry::Env['PAGER'] || '' # Default to less, and make sure less is being passed the correct # options pager = "less -R -F -X" if pager.strip.empty? || pager =~ /^less\b/ pager end
new(*)
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Calls superclass method
Pry::Pager::NullPager::new
# File lib/pry/pager.rb, line 161 def initialize(*) super @tracker = PageTracker.new(height, width) @buffer = "" @pager = nil end
Public Instance Methods
close()
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# File lib/pry/pager.rb, line 181 def close if invoked_pager? pager.close else @out.puts @buffer end end
write(str)
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# File lib/pry/pager.rb, line 168 def write(str) if invoked_pager? write_to_pager str else @tracker.record str @buffer += str write_to_pager @buffer if @tracker.page? end rescue Errno::EPIPE raise StopPaging end
Private Instance Methods
invoked_pager?()
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# File lib/pry/pager.rb, line 195 def invoked_pager? @pager end
pager()
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# File lib/pry/pager.rb, line 199 def pager @pager ||= IO.popen(self.class.default_pager, 'w') end
write_to_pager(text)
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# File lib/pry/pager.rb, line 191 def write_to_pager(text) pager.write @out.decolorize_maybe(text) end