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Warning: Cannot modify header information - headers already sent by (output started at /home/didierve/didierverna.net/blog/inc/libs/clearbricks/common/lib.json.php:309) in /home/didierve/didierverna.net/blog/inc/libs/clearbricks/common/lib.http.php on line 295 Didier Verna's Scientific Blog - Tag - lstlistingDidier Verna's scientific blog: Lisp, Emacs, LaTeX and random stuff.2024-01-31T17:45:28+00:00Didier Vernaurn:md5:a22c53786aff986a2da4c770c233a8f9DotclearBeamer blocks and the Listings packageurn:md5:209e8ca9299e0a6c351ff87e2850d8b0Wednesday, June 4 2008Wednesday, June 4 2008Didier VernaLaTeXBeamerhacklstlistingsoftware For many of my lectures, I use the Listings package for typesetting code excerpts, and include them in Beamer blocks. Providing nice shortcuts for doing that is not trivial if you want to preserve control over Listings options, and add a new one for the block's title. Here is a way to nicely wrap a call to <code>\lstinputlisting</code> inside a Beamer block.<br /><br />First, let's use the <code>xkeyval</code> package to create a "title" option:<br /><pre>\define@cmdkey[dvl]{lst}[@dvl@lst@]{title}{}</pre><br />Next, a low-level listing input command. This macro takes 4 arguments: an overlay specification, a title for the block, a list of options passed to Listings, and a file name for input:<br /><pre>%% \dvlinputlisting{overlay}{title}{lstoption=,...}{file}<br />\newcommand\dvlinputlisting[4]{%<br /> \begin{block}#1{#2}<br /> %% #### WARNING: I need this hack because keyval-style options<br /> %% mess up the parsing.<br /> \expandafter\lstinputlisting\expandafter[#3]{#4}<br /> \end{block}}</pre><br />And now, you can define all sorts of specialized versions for different languages. For example, here is one for Common Lisp code. The block title is "Lisp" by default, and a "lisp" extension is automatically added to the file name:<br /><pre>%% Language-specific shortcuts:<br />%% The title option is used for the beamer block's title.<br />%% All other options are passed to listings.<br />%% \XXXinputlisting<overlay>[title=,lstoption=,...]{file}<br />\newcommand<>\clinputlisting[2][]{%<br /> \def\@dvl@lst@title{Lisp}%<br /> \setkeys*[dvl]{lst}{#1}%<br /> \edef\@dvl@lst@options{language=lisp,\XKV@rm}%<br /> \dvlinputlisting{#3}{\@dvl@lst@title}{\@dvl@lst@options}{#2.lisp}}</pre><br />Which you could call like this:<br /><pre>\clinputlisting<2->[title={Example 1}, gobble=2]{ex1}</pre><br />As you can see, "title" is an option for the Beamer block, and all the others are dispatched to Listings. Cool.<br /><br /><br />Now, things are getting more complicated when you want nice shortcuts for <em>inline environments</em>, because nesting Beamer blocks with listings doesn't work. Fortunately, I figured out a trick based on the Verbatim package to simulate that. The idea is to store the contents of the listing environment in a temporary file, and use <code>\lstinputlisting</code> as before to include it. Clever right ?<br />:-)<br />Here is a generic environment for doing that. In the opening, we read the environment's contents and store it in the file <code>\jobname.dvl</code>. In the ending, we call our previous macro <code>\dvlinputlisting</code> on that file (actually, on a dynamically created argument list called <code>\@dvl@args</code>:<br /><pre>\usepackage{verbatim}<br />\newwrite\lstvrb@out<br />\def\@dvllisting{%<br /> \begingroup<br /> \@bsphack<br /> \immediate\openout\lstvrb@out\jobname.dvl<br /> \let\do\@makeother\dospecials\catcode`\^^M\active<br /> \def\verbatim@processline{%<br /> \immediate\write\lstvrb@out{\the\verbatim@line}}%<br /> \verbatim@start}<br />\def\@enddvllisting{%<br /> \immediate\closeout\lstvrb@out<br /> \@esphack<br /> \endgroup<br /> \expandafter\dvlinputlisting\@dvl@args}</pre><br />And now, we can define all sorts of specialized versions for every language we're insterested in. Again, here is one for Common Lisp.<br /><pre>\newenvironment<>{cllisting}[1][]{%<br /> \def\@dvl@lst@title{Lisp}%<br /> \setkeys*[dvl]{lst}{#1}%<br /> \edef\@dvl@lst@options{language=lisp,\XKV@rm}%<br /> \xdef\@dvl@args{{#2}{\@dvl@lst@title}{\@dvl@lst@options}{%<br /> \jobname.dvl}}<br /> \@dvllisting}{%<br /> \@enddvllisting}</pre><br />Which you can use like this:<br /><pre>\begin{cllinsting}<2->[title={Example 1},gobble=2]<br /> (defun foo (x) (* 2 x))<br />\end{cllisting}</pre><br />Don't forget that frames containing code excerpts like this are <em>fragile</em>!https://www.didierverna.net/blog/index.php?post/2008/06/04/Beamer-blocks-and-the-Listings-package#comment-formhttps://www.didierverna.net/blog/index.php?feed/navlang:en/atom/comments/49