X-Git-Url: http://gitweb.michael.orlitzky.com/?p=mjotex.git;a=blobdiff_plain;f=mjo-listing.tex;h=ccd0d9cf0fb23aaf14f40177959df3a41ed95473;hp=5207aa2b83e1721af9ca8378ab72ca8c6a5ae877;hb=HEAD;hpb=ff61d05732bb49a62b91f6b32ba1e2cdb6d82d19

diff --git a/mjo-listing.tex b/mjo-listing.tex
index 5207aa2..ccd0d9c 100644
--- a/mjo-listing.tex
+++ b/mjo-listing.tex
@@ -10,8 +10,17 @@
 %   x
 %   \end{tcblisting}
 %
-\usepackage{listings}
-\usepackage{tcolorbox}
+\ifx\havemjolisting\undefined
+\def\havemjolisting{1}
+
+
+\ifx\lstset\undefined
+  \usepackage{listings}
+\fi
+
+\ifx\tcbuselibrary\undefined
+  \usepackage{tcolorbox}
+\fi
 
 % Tell tcolorbox to use ``listings'' within the boxes.
 \tcbuselibrary{listings}
@@ -38,3 +47,23 @@
   keywordstyle=\color{brilliantlavender},
   stringstyle=\color{brilliantgreen}
 }
+
+
+% Input a SageMath example code listing from a file. You generally
+% want these to be in separate files so that the build system can test
+% them automatically.
+%
+% The sole argument is the "name" of the listing, which ultimately
+% just identifies a file named "sage_listings/<name>.listing".
+\newtcbinputlisting{\sagelisting}[2][]{%
+  colback=codebg,%
+  coltext=codefg,%
+  enlarge bottom finally by=\baselineskip,%
+  enlarge top initially by=\baselineskip,%
+  left=2em,%
+  listing only,%
+  listing options={language=sage,style=sage},%
+  listing file=sage_listings/#2.listing,%
+  #1}
+
+\fi