I'm creating a presentation using the beamer LaTex package. Beamer
comes with an environment called "semiverbatim" which is like
"verbatim", but allows you to place commands inside the environment.
This is useful in beamer to control how the overlays of a frame
unfold. For example:
\begin{frame}[fragile, shrink]
\frametitle{Some Code Sample}
\begin{semiverbatim}
private String foobar() \{
String s = "val"
\alert<2->{s = null};}
return s;
\}
\end{semiverbatim}
\end{frame}
This will cause the third line to appear red in the second stage of
the frame transition.
This is all good and fine, however, the "semiverbatim" environment,
much like the "verbatim" environment, is pretty limited. I would like
to use the "Verbatim" environment from the fancyvrb package.
Is there anyway to use "Verbatim" in the same way "semiverbatim" is
used?
I'm not having much luck, I'm afraid. I can get the \alert to work okay, but only without an overlay specification:
\documentclass{beamer}
\usepackage{fancyvrb}
\begin{document}
\begin{frame}[fragile]
\frametitle{Some Code Sample}
\begin{Verbatim}[commandchars={\\[]}]
private String foobar() {
String s = "val"
\alert[s = null];}
return s;
}
\end{Verbatim}
\end{frame}
\end{document}
When you try \alert<2-> it breaks, and changing catcodes of < and > doesn't seem to help.
Not sure if it helps you directly, but when I've loaded source into a beamer slide, I used the listings package, lstset, and the lstlisting environment. I never use any reveals in the code, though, so I haven't tested that interaction.
Related
When using:
\begin{listing}
...
\caption{foo}
\end{listing}
The caption will say: Listing x: foo. How can I replace the word Listing with something else?
If you are using minted (I am, and my source looks like yours), you may want to try
\renewcommand{\listingscaption}{Some fancy listing}
You might want to read the manual
http://mirror.switch.ch/ftp/mirror/tex/macros/latex/contrib/listings/listings.pdf
page 32
\begin{listing}[caption=Some fancy listing]
or try
\begin{listing}[title=Some fancy listing]
or try
\renewcommand{\lstlistingname}{A funny listing}
Minimal example that works for me:
\documentclass{article}
\usepackage{listings}
\renewcommand{\lstlistingname}{Something}
\begin{document}
Some text.
\begin{lstlisting}[caption=wwww]
xxxx
\end{lstlisting}
Some more text.
\end{document}
I am currently using Beamer and the listing package to pretty-print code into Beamer blocks. So what I'm doing looks like :
\begin{block}{}
\begin{lstlisting}
int foobar(void) { return 0; }
\end{lstlisting}
\end{block}
Now, I find it cumbersome to start the block and lstlisting environments everytime. I'd like to have a simple codeblock environment that just does it:
\begin{codeblock}
int foobar(void) { return 0; }
\end{codeblock}
So, I tried something like :
\lstnewenvironment{codeblock}
{\begin{block}{}}
{\end{block}}
But unfortunately, the Beamer document no longer compiles, with the following error:
! Missing } inserted.
<inserted text>
}
l.178 \end{frame}
?
Is there some way to do this ?
In Problem with creating a newenvironment in LaTeX, Andreas Grech had the same problem, but it could solve it since there was another way to enter/exit the enclosing environment. But in the case of the block Beamer environment, it seems there is no other way than doing \begin{block}...\end{block}.
I had the same problem and could not find a solution for it. My workaround was to use the \lstinputlisting command and have the code in a separate file. That's great if you have real code you want to include. Not so for small examples.
Another workaround is to put the code snipplet into a variable before starting the {frame} environment and then reference it. How to do this is explained in latex-beamer docs. It would also allow you to employ your custom environment/command.
I "solved" this by using the fancyvrb package's \VerbatimOut(See write environmnet body verbatim to a file) to create a temporary file which then can be included with lstinputlisting:
\usepackage{fancyvrb}
\usepackage{listings}
\newenvironment{blocklisting}[1]
{\begingroup\lstset{#1}\VerbatimOut{blocklisting-tmp.txt}}
{\endVerbatimOut\begin{block}{Code}\lstinputlisting{blocklisting-tmp.txt}\end{block}\endgroup}
For some reason i could not make the environment-argument optional, though.
Used like this:
\begin{document}
\begin{frame}[fragile]
\frametitle{Whatever}
\begin{blocklisting}{language=Java, basicstyle=\Huge}
Code
\end{blocklisting}
\begin{blocklisting}{}
Code 2
\end{blocklisting}
\end{frame}
\end{document}
Not the optimal solution, but it works, i guess.
I am trying to implement this new environment in LaTeX:
\newenvironment{javacode}[2]
{\begin{lstlisting}[language=java, label=#1, caption=#2]}
{\end{lstlisting}}
And then use it like such:
\begin{javacode}{c}{some code}
int x = 5;
\end{javacode}
But I am getting the following error:
Overfull \hbox (6.0pt too wide) in paragraph at lines 6--6
[][][][][][][]
[1] [2]) [3])
*
Can anyone help as regards fixing this problem?
[Update]
I tried it doing it like Red-nosed unicorn instructed, and it worked correctly.
But now I tried adding a \begin{singlespace} like such:
\lstnewenvironment{javacode}[2]
{
\begin{singlespace}
\lstset{language=java, label=#1, caption=#2}}
{
\end{singlespace}
}
And I got the same error:
Overfull \hbox (6.0pt too wide) in paragraph at lines 6--6
[][][][][][][]
[1]) [2] [3])
*
This is a special case because the listings environment needs to parse ahead itself to find the end of itself. The reason is that macros inside the listings environment must not get expanded – that of course includes the end tag of the environment.
So basically it looks in each line if the line contains \end{lstlisting} – but in your case, no such line exists since the \end{javacode} macro has not yet been expanded. So listings continues to search until the end of the file.
Listings defines an own command to work around this. From the documentation:
\lstnewenvironment
{⟨name⟩}[⟨number⟩][⟨opt. default arg.⟩]
{⟨starting code⟩}
{⟨ending code⟩}
For example:
\lstnewenvironment{javacode}[2]
{\lstset{language=java, label=#1, caption=#2}}
{}
EDIT In response to your edited question: I tried to compile the following minimal “working” example. Actually, it’s not so much working – the latex processor just stops right in the middle and waits for a user input.
Since the listings documentation makes no mention of a special treatment of singlespace, I think you may have uncovered a bug. The best course of action is probably to get feedback from the maintainer of the listings package.
% mini.dvi
\documentclass{article}
\usepackage{listings}
\usepackage{setspace}
\doublespacing
\lstnewenvironment{javacode}
{\begin{singlespace}
\lstset{language=java}}
{\end{singlespace}}
\begin{document}
\begin{javacode}
int a = 1;
int b = 2;
\end{javacode}
\end{document}
Upon further research, I found this http://www.tug.org/pipermail/texhax/2009-June/012699.html
To workaround my solution, I need to use \singlespacing instead of the singlespace environment.
The following is now my working code:
\lstnewenvironment{javacode}[2]
{\singlespacing\lstset{language=java, label=#1, caption=#2}}
{}
I'm creating a Beamer presentation that has a lot of example LaTeX in it, which has to go in a verbatim environment. I'm getting tired of typing
\begin{example}
\begin{verbatim}
Verbatim Text
\end{verbatim}
\end{example}
I wish to create a new command or environment that will shorthand this for me. I also need this for blocks and theorems, since I'm using those frequently as well. But if I can figure it out for examples, it should be easy to translate to another example.
I can't create a new environment or command using just \begin{verbatim}, since it cuts off the rest of the command. So I switched to using the fancyvrb package, and tried the following:
\DefineVerbatimEnvironment
{MyVerbatim}{Verbatim}{}
\newcommand{\makeexample}[1]{
\begin{example}
\begin{MyVerbatim}
#1
\end{MyVerbatim}
\end{example}
}
\makeenvironment{VerbExample}{\begin{example}
\begin{MyVerbatim}}{\end{MyVerbatim}\end{example}}
That gives me the \makeexample{Example Text} command, and the \begin{VerbExample}...\end{VerbExample} environment, but they both still throw errors on compile. The frame I'm trying to use them in looks like this (I've got the [fragile] option on the frame, so it's not that).
\begin{frame}[fragile]
\frametitle{Why Doesn't Verbatim Work?}
\makeexample{Verbatim Text}
\begin{VerbExample}
Verbatim Text
\end{VerbExample}
\end{frame}
Environment definition:
\newenvironment{VerbExample}
{\example\semiverbatim}
{\endsemiverbatim\endexample}
Frame definition:
\begin{frame}[fragile]
\frametitle{Title}
\begin{VerbExample}
test test test $t$ $\\omega$
test test
\end{VerbExample}
\end{frame}
Verbatim cannot go inside \newcommand. Semiverbatim is defined by Beamer and works well with it. The three characters \ { } must be escaped as \\ \{ \}.
Source: Beamer user guide, pp. 119-120
http://www.ctan.org/tex-archive/macros/latex/contrib/beamer/doc/beameruserguide.pdf
I would like to define a new command like this
\newcommand{\bob}[1]{\excerpt \begin{lstlisting} {#1} \end{lstlisting}}
and then use it like this
\bob{abcd}
but i get the following error in latex.
text dropped after begin of listing latex
EDIT:
I tried the following
\newcommand{\boy}[1] {{%
\begin{Verbatim} %
{ #1 } %
\end{Verbatim} }}
And I still get an error when I try to use it.
\boy{abc}
Perhaps you are looking for the \newenvironment macro.
In this case you would use it like this
\newenvironment{bob}{%
\excerpt \begin{lstlisting}}{%
\end{lstlisting}}
and later
\begin{bob}
abcd
\end{bob}
The {listing} environment is special and magical; it can't be used inside a command like that. Changing to a \newenvironment setup as described by dmckee should work. If you can't make that work, check out the fancyvrb package.
Try the lstnewenvironment of the listings package.