[Rd] latex problem with \preformatted (PR#5645)

[gregory_r_warnes at groton.pfizer.com]

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There is a small bug in the implementation of \preformatted in R 1.8.0:
The closing "\end{verbatim}" needs to be followed by a newline, since my
latex ignores everything following it on the line.


In an .Rd file I have:


\details{
  This function provides a thin wrapper around the Unix "fork" system
  call, which will create a new process which is an exact copy of the
  [...]
    
\preformatted{
  {
    pid = fork(slave=NULL) 
    if(pid==0) { 
      cat("Hi from the child process\n"); exit() 
    } else {
      cat("Hi from the parent process\n");
    } 
  } 
}

}

which gets translated to 

\begin{Details}\relax
This function provides a thin wrapper around the Unix "fork" system
call, which will create a new process which is an exact copy of the
[...]

\begin{verbatim}
  \{
    pid = fork(slave=NULL) 
    if(pid==0) \{ 
      cat("Hi from the child process\bsl{}n"); exit() 
    \} else \{
      cat("Hi from the parent process\bsl{}n");
    \} 
  \}
\end{verbatim}\end{Details}


When processed by Rd2dvi these warning messages show up in the log:

This is TeX, Version 3.14159 (Web2C 7.3.1) (format=latex 2002.7.17)  9 DEC
2003 16:11
[...]

LaTeX Warning: Characters dropped after `\end{verbatim}' on input line 139.

[3] [4] [5] [6] [7] [8] [9]

! LaTeX Error: \begin{list} on input line 73 ended by \end{document}.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.437 \end{document}
[...]

The solution is to simply add an '\n' at the appropriate place in Rdconv.pm:

gsun492: R [61]> diff -u Rdconv.pm.orig Rdconv.pm
--- Rdconv.pm.orig 2003-12-09 16:32:17.940846000 -0500
+++ Rdconv.pm 2003-12-09 16:32:32.440931000 -0500
@@ -2450,7 +2450,7 @@
     my $code = $_[0];
 
     $code = latex_code_trans ($code);
-    $code = "\\begin\{verbatim\}" . $code . "\\end\{verbatim\}";
+    $code = "\\begin\{verbatim\}" . $code . "\\end\{verbatim\}\n";
     $code;
 }

after which everything works fine.

-Greg


Gregory R. Warnes, Ph.D.
Senior Coordinator
Groton Non-Clinical Statistics
Pfizer Global Research and Development
 <<Warnes, Gregory R.vcf>> 


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