Unchomping a file, then appending a string

Question

I have a text file with path name file, and some content string that I want to append to it. I want to do something close to

File.open(file, "a"){|io| io.puts(string)}

but if the original content of the file does not end with an endline character $/, I want to insert one before string. What is the most effective way to do this?

score 1 · Accepted Answer · answered Nov 04 '12 at 05:37

1

File.open(file, 'r+') do |f|
  unless (last = f.readlines[-1]) && last.end_with?($/)
    f.puts $/
  end

  f.puts string
end

answered Nov 04 '12 at 05:37

pje

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I though that an answer would look like this, but didn't have in mind of using the `r+` mode. – sawa Nov 04 '12 at 05:49

score -2 · Answer 2 · answered Nov 04 '12 at 05:01

-2

File.open(file, "a"){ |io| 
   io.puts
   io.puts(string)
}

answered Nov 04 '12 at 05:01

ceth

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That will add an endline character even when the original content ends with an endline character. – sawa Nov 04 '12 at 05:03
Then you have to read the last line in the file and if it is empty add an endline character – ceth Nov 04 '12 at 05:05
Whether the last line is empty does not matter. – sawa Nov 04 '12 at 05:06

Unchomping a file, then appending a string

2 Answers2