From 5f09cf7ff033ae11c5094fe39f8cd2ac11657229 Mon Sep 17 00:00:00 2001
From: Florian Eitel <florian.eitel@wooga.net>
Date: Thu, 22 Aug 2013 20:15:36 +0200
Subject: Write id for code block to label attr in latex when listing is used

The code:

    ~~~{#test}
    asdf
    ~~~

gets compiled to html:

    <pre id="test">
    asdf
    </pre>

So it is possible to link to the identifier `test`

But this doesn't happen on latex

When using the listings package (`--listings`) it is possible to set the
identifier using the `label=test` property:

    \begin{lstlisting}[label=id]
    hi
    \end{lstlisting}

And this is exactly what this patch is doing.

Modified LaTeX Reader/Writer and added tests for this.
---
 src/Text/Pandoc/Writers/LaTeX.hs | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

(limited to 'src/Text/Pandoc/Writers')

diff --git a/src/Text/Pandoc/Writers/LaTeX.hs b/src/Text/Pandoc/Writers/LaTeX.hs
index ab579a326..bf056001f 100644
--- a/src/Text/Pandoc/Writers/LaTeX.hs
+++ b/src/Text/Pandoc/Writers/LaTeX.hs
@@ -313,7 +313,7 @@ blockToLaTeX (BlockQuote lst) = do
        _ -> do
          contents <- blockListToLaTeX lst
          return $ "\\begin{quote}" $$ contents $$ "\\end{quote}"
-blockToLaTeX (CodeBlock (_,classes,keyvalAttr) str) = do
+blockToLaTeX (CodeBlock (identifier,classes,keyvalAttr) str) = do
   opts <- gets stOptions
   case () of
      _ | isEnabled Ext_literate_haskell opts && "haskell" `elem` classes &&
@@ -344,7 +344,11 @@ blockToLaTeX (CodeBlock (_,classes,keyvalAttr) str) = do
                              [ (if key == "startFrom"
                                    then "firstnumber"
                                    else key) ++ "=" ++ attr |
-                                   (key,attr) <- keyvalAttr ]
+                                   (key,attr) <- keyvalAttr ] ++
+                             (if identifier == ""
+                                   then []
+                                   else [ "label=" ++ identifier ])
+
                         else []
                printParams
                    | null params = empty
-- 
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