Move tune and first line inclusion code into macros.

Also use tune title, not name, as hyperlink targets. This removes the need to pass
the name into the macros.

dottes.tex

@@ -7,7 +7,7 @@
 \usepackage{fancyhdr}
 \usepackage{longtable}
 \usepackage[UKenglish]{babel}
-\usepackage[UKenglish]{isodate}
+%\usepackage[UKenglish]{isodate}
 
 % Non-indented paragraphs with space between them.
 \usepackage{parskip}
@@ -27,12 +27,46 @@
 
 % ----- Common variables
 
-\def \build {\input{buildno.txt}}
-\def \instrument {\input{instrument.txt}}
+\newcommand{\build}{\input{buildno.txt}}
+\newcommand{\instrument}{\input{instrument.txt}}
 
 % Havoc purple is #9900cc.
 \definecolor{havocpurple}{rgb}{0.597,0,0.797}
 
+% ----- Macros
+
+\makeatletter
+\def\ifemptyarg#1{%
+  \if\relax\detokenize{#1}\relax % H. Oberdiek
+    \expandafter\@firstoftwo
+  \else
+    \expandafter\@secondoftwo
+  \fi}
+\makeatother
+
+% Show the main tune graphic and optional change.
+% Args are change title (optional), tune title, tune graphic filename.
+\newcommand{\showtune}[3][]{%
+  \vfill
+  \begin{center}
+  \phantomsection
+  \hypertarget{#2}{%
+    \includegraphics[width=\textwidth,height=0.85\textheight,keepaspectratio]{#3}
+  }
+  \addcontentsline{toc}{section}{#2}
+  \end{center}
+  \ifemptyarg{#1}{}{%
+    Change: \hyperlink{#1}{#1}
+  }%
+}
+
+% Show the tune first line. Generate table row.
+% Args are the tune title and the first line graphic filename.
+\newcommand{\showfirstline}[2]{%
+  \hyperlink{#1}{#1} & %
+    \raisebox{-.25\height}{\includegraphics[width=0.65\textwidth,height=1.3cm]{#2}} \\
+}
+
 % ----- Paper size document setup
 
 \input{docsetup.tex}

makeBookeTunePages.sh

@@ -42,21 +42,14 @@ find $booke -name "*.abc" | sort |
         fixtitle "$title"
         title=$retval
 
-        echo -E "\vfill \begin{center}" >> $tunesoutput
-        echo -E "\phantomsection" >> $tunesoutput
-        echo -E "\hypertarget{$name}{\includegraphics[width=\textwidth,height=0.85\textheight,keepaspectratio]{$graphicsdir/$name}}" >> $tunesoutput
-        echo -E "\addcontentsline{toc}{section}{$title}" >> $tunesoutput
-        echo -E "\end{center}" >> $tunesoutput
-
         changefile=`$dir/abcfield.py --field N $filename | grep "Change:" | sed -e "s/Change: *//"`
         changetitle=""
         if [ -n "$changefile" ]; then
             changetitle=`$dir/abcfield.py --field T --latex $booke/$changefile`
             fixtitle "$changetitle"
             changetitle=$retval
-            changename=`basename $changefile .abc`
-            echo -E "Change: \hyperlink{$changename}{$changetitle}" >> $tunesoutput
         fi
+        echo -E "\showtune[$changetitle]{$title}{$graphicsdir/$name}" >> $tunesoutput
 
-        echo -E "\hyperlink{$name}{$title} & \raisebox{-.25\height}{\includegraphics[width=0.65\textwidth,height=1.3cm]{$graphicsdir/firstline-$name}} \\\\" >> $indexoutput
+        echo -E "\showfirstline{$title}{$graphicsdir/firstline-$name}" >> $indexoutput
     done