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    <p>After reading your reply to my comment, I think your situation is that you have some data structure, maybe with type <code>[(String,String)]</code>, and you'd like to output it for debugging purposes. Using <code>show</code> would be convienent, but it escapes non-ASCII characters.</p> <p>The problem here isn't with the unicode, you need a function that will properly format your data for display. I don't think <code>show</code> is the right choice, in part because of the problems with escaping some characters. What you need is a type class like <code>Show</code>, but one that displays data for reading instead of escaping characters. That is, you need a pretty-printer, which is a library that provides functions to format data for display. There are several pretty-printers available on Hackage, I'd look at <a href="http://hackage.haskell.org/package/uulib" rel="nofollow noreferrer">uulib</a> or <a href="http://hackage.haskell.org/package/wl-pprint" rel="nofollow noreferrer">wl-pprint</a> to start. I think either would be suitable without too much work.</p> <p>Here's an example with the uulib tools. The <code>Pretty</code> type class is used instead of Show, the library comes with many useful instances.</p> <pre><code>import UU.PPrint -- | Write each item to StdOut logger :: Pretty a =&gt; a -&gt; IO () logger x = putDoc $ pretty x &lt;+&gt; line </code></pre> <p>running this in ghci:</p> <pre><code>Prelude UU.PPrint&gt; logger 'Д' Д Prelude UU.PPrint&gt; logger ('Д', "other text", 54) (Д,other text,54) Prelude UU.PPrint&gt; </code></pre> <p>If you want to output to a file instead of the console, you can use the <code>hPutDoc</code> function to output to a handle. You could also call <code>renderSimple</code> to produce a <code>SimpleDoc</code>, then pattern match on the constructors to process output, but that's probably more trouble. Whatever you do, avoid <code>show</code>:</p> <pre><code>Prelude UU.PPrint&gt; show $ pretty 'Д' "\1044" </code></pre> <p>You could also write your own type class similar to show but formatted as you like it. The <code>Text.Printf</code> module can be helpful if you go this route.</p>
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    1. COthanks . i will try
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    2. COcould you get tip how pretty-printers can help me
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    3. COI've added an example which should make this clear. Note that the usual way of using a pretty-printer would be to assemble all your data at once and render the document in one go. I've done this line-by-line because that's more useful for debugging; you'll get more partial output in your program crashes or hangs.
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