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From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Newsgroups: alt.os.linux,alt.os.linux.ubuntu,comp.lang.php
Subject: Re: query: how many use PHP for linux scripts
Followup-To: comp.lang.php
Date: Thu, 15 May 2014 19:33:12 +0200
Organization: PointedEars Software (PES)
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[X-Post & F'up2 comp.lang.php]

Jasen Betts wrote in alt.os.linux and alt.os.linux.ubuntu:

> white program

Sorry, my programs are mostly in green.  Or blue.  Depends on editor and 
language.

> the reads a text file and swaps every pair of lines and
> writes a new file.
> 
> so
> 
> one
> two
> three
> four
> 
> becomes
> 
> two
> one
> four
> three
> 
> design it to work  on any text file.

Challenge accepted :)

First, read the file's lines into an array:

  $lines = file('file.txt');

Second, swap the array elements:

  $swapped = array_map(
    function ($key) use ($lines) {
      if ($key % 2 === 0)
      {
        return $lines[$key + 1];
      }
   
      return $lines[$key - 1];
    },
    array_keys($lines));

Third, write the result:

  file_put_contents('file-new.txt', join(PHP_EOL, $swapped) . PHP_EOL);

Or, in two statements:

  $lines = file('file.txt');

  file_put_contents(
    'file-new.txt',
    join(
      PHP_EOL,
      array_map(
        function ($key) use ($lines) {
          if ($key % 2 === 0)
          {
            return $lines[$key + 1];
          }
   
          return $lines[$key - 1];
        },
        array_keys($lines)
      )
    ) . PHP_EOL
  );

> including files with lines larger than  RAM + swap.

<https://en.wikipedia.org/wiki/Moving_the_goalposts>

> if it must work, it's easier in C.

I dare you to beat the above *in ease* with C.

And where did the maniac grow up whose *text* files demanded those 
requirements in the first place?  Why were they not LARTed when there was 
still time?


PointedEars
-- 
Anyone who slaps a 'this page is best viewed with Browser X' label on
a Web page appears to be yearning for the bad old days, before the Web,
when you had very little chance of reading a document written on another
computer, another word processor, or another network. -- Tim Berners-Lee