require 'spec_helper'

# https://www.gnu.org/software/sed/manual/sed.html#Examples
describe 'sed examples' do
  include FixturesHelper
  include ProcessHelper

  context "centering lines" do
    it "centers" do
      lines = %w{john paul george} + ['             ringo      ']
      out = run(lines, 'each_line.strip.center(10)')
      out.should == "   john   \n   paul   \n  george  \n  ringo   "
    end
  end

  context "increment a number" do
    it "increments" do
      lines = ('5'..'10').to_a
      out = run(lines, '(each_line.to_i+1)')
      out.should == ('6'..'11').to_a.join("\n")
    end
  end

  context "reverse characters of lines" do
    it "reverses" do
      lines = %w{john paul george ringo}
      out = run(lines, 'each_line.reverse')
      out.should == "nhoj\nluap\negroeg\nognir"
    end
  end

  context "numbering lines" do
    it "numbers" do
      lines = %w{john paul george ringo}
      out = run(lines, 'map.with_index { |line, index| "#{(index+1).to_s.rjust(6)}  #{line}" }')
      out.should == "     1  john\n     2  paul\n     3  george\n     4  ringo"
    end
  end

  context "counting lines" do
    it "counts" do
      lines = %w{john paul george ringo}
      out = run(lines, 'length')
      out.should == "4"
    end
  end

  context "printing the first lines" do
    it "prints" do
      lines = %w{john paul george ringo}
      out = run(lines, '[0,2]')
      out.should == "john\npaul"
    end
  end

  context "printing the last lines" do
    it "prints" do
      lines = %w{john paul george ringo}
      out = run(lines, '[2..-1]')
      out.should == "george\nringo"
    end
  end

  context "make duplicate lines unique" do
    it "dedupes" do
      lines = %w{john john paul george george george ringo}
      out = run(lines, 'uniq')
      out.should == "john\npaul\ngeorge\nringo"
    end
  end

  context "print duplicated lines of input" do
    it "prints" do
      lines = %w{john john paul george george george ringo}
      out = run(lines, 'select { |line| self.count(line) > 1 }')
      out.should == "john\njohn\ngeorge\ngeorge\ngeorge"
    end
  end

  context "remove all duplicated lines" do
    it "removes" do
      lines = %w{john john paul george george george ringo}
      out = run(lines, 'select { |line| self.count(line) == 1 }')
      out.should == "paul\nringo"
    end
  end

  context "squeezing blank lines" do
    it "squeezes" do
      lines = "john\n\npaul\ngeorge\n\n\nringo"
      out = run(lines, 'to_s.squeeze("\n")')
      out.should == "john\npaul\ngeorge\nringo"
    end
  end
end