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% arara: pdflatex: {shell: yes, files: [latexindent]}
\section{Fine tuning}\label{sec:finetuning}
\texttt{latexindent.pl} operates by looking for the code blocks detailed in
\vref{tab:code-blocks}.
\announce{2019-07-13}{details of fine tuning of code blocks} The fine tuning of the details of such code blocks
is controlled by the \texttt{fineTuning} field, detailed in \cref{lst:fineTuning}.
This field is for those that would like to peek under the bonnet/hood and make some fine
tuning to \texttt{latexindent.pl}'s operating.
\begin{warning}
Making changes to the fine tuning may have significant consequences for your indentation scheme,
proceed with caution!
\end{warning}
\begin{widepage}
\cmhlistingsfromfile[style=fineTuning]*{../defaultSettings.yaml}[width=0.95\linewidth,before=\centering,yaml-TCB]{\texttt{fineTuning}}{lst:fineTuning}
\end{widepage}
The fields given in \cref{lst:fineTuning} are all \emph{regular expressions}. This manual is
not intended to be a tutorial on regular expressions; you might like to read, for
example, \cite{masteringregexp} for a detailed covering of the topic.
We make the following comments with reference to \cref{lst:fineTuning}:
\begin{enumerate}
\item the \texttt{environments:name} field details that the \emph{name} of an
environment can contain:
\begin{enumerate}
\item \texttt{a-z} lower case letters
\item \texttt{A-Z} upper case letters
\item \texttt{@} the \texttt{@} 'letter'
\item \lstinline!\*! stars
\item \texttt{0-9} numbers
\item \lstinline!_! underscores
\item \lstinline!\! backslashes
\end{enumerate}
The \texttt{+} at the end means \emph{at least one} of the above
characters.
\item the \texttt{ifElseFi:name} field:
\begin{enumerate}
\item \lstinline^@?^ means that it \emph{can possibly} begin with
\lstinline^@^
\item followed by \texttt{if}
\item followed by 0 or more characters from \texttt{a-z}, \texttt{A-Z} and
\texttt{@}
\item the \texttt{?} the end means \emph{non-greedy}, which means `stop the
match as soon as possible'
\end{enumerate}
\item the \texttt{keyEqualsValuesBracesBrackets} contains some interesting syntax:
\begin{enumerate}
\item \lstinline!|! means `or'
\item \lstinline^(?:(?<!\\)\{)^ the \lstinline^(?:...)^ uses a \emph{non-capturing} group --
you don't necessarily need to worry about what this means, but just know that for the
\texttt{fineTuning} feature you should only ever use \emph{non}-capturing
groups, and \emph{not} capturing groups, which are simply
\lstinline!(...)!
\item \lstinline^(?<!\\)\{)^ means a \lstinline^{^ but it can \emph{not}
be immediately preceded by a \lstinline!\!
\end{enumerate}
\item in the \texttt{arguments:before} field
\begin{enumerate}
\item \lstinline^\d\h*^ means a digit (i.e. a number), followed by 0 or more horizontal
spaces
\item \lstinline^;?,?^ means \emph{possibly} a semi-colon, and possibly a comma
\item \lstinline^\<.*?\>^ is designed for 'beamer'-type commands; the
\lstinline^.*?^ means anything in between \lstinline^<...>^
\end{enumerate}
\item the \texttt{modifyLineBreaks} field refers to fine tuning settings detailed in
\vref{sec:modifylinebreaks}. In particular:
\begin{enumerate}
\item \texttt{betterFullStop} is in relation to the one sentence per line routine, detailed in
\vref{sec:onesentenceperline}
\item \texttt{doubleBackSlash} is in relation to the \texttt{DBSStartsOnOwnLine} and
\texttt{DBSFinishesWithLineBreak} polyswitches surrounding double back slashes, see
\vref{subsec:dbs}
\item \texttt{comma} is in relation to the \texttt{CommaStartsOnOwnLine} and
\texttt{CommaFinishesWithLineBreak} polyswitches surrounding commas in optional and mandatory
arguments; see \vref{tab:poly-switch-mapping}
\end{enumerate}
\end{enumerate}
It is not obvious from \cref{lst:fineTuning}, but each of the \texttt{follow},
\texttt{before} and \texttt{between} fields allow trailing comments, line
breaks, and horizontal spaces between each character.
\begin{example}
As a demonstration, consider the file given in \cref{lst:finetuning1}, together with its
default output using the command
\begin{commandshell}
latexindent.pl finetuning1.tex
\end{commandshell}
is given in \cref{lst:finetuning1-default}.
\begin{cmhtcbraster}[raster column skip=.01\linewidth]
\cmhlistingsfromfile{demonstrations/finetuning1.tex}{\texttt{finetuning1.tex}}{lst:finetuning1}
\cmhlistingsfromfile{demonstrations/finetuning1-default.tex}{\texttt{finetuning1.tex} default}{lst:finetuning1-default}
\end{cmhtcbraster}
It's clear from \cref{lst:finetuning1-default} that the indentation scheme has not worked as
expected. We can \emph{fine tune} the indentation scheme by employing the settings
given in \cref{lst:fine-tuning1} and running the command
\begin{commandshell}
latexindent.pl finetuning1.tex -l=fine-tuning1.yaml
\end{commandshell}
and the associated (desired) output is given in \cref{lst:finetuning1-mod1}.
\begin{cmhtcbraster}[raster column skip=.01\linewidth]
\cmhlistingsfromfile{demonstrations/finetuning1-mod1.tex}{\texttt{finetuning1.tex} using \cref{lst:fine-tuning1}}{lst:finetuning1-mod1}
\cmhlistingsfromfile[style=yaml-LST]*{demonstrations/fine-tuning1.yaml}[yaml-TCB]{\texttt{finetuning1.yaml}}{lst:fine-tuning1}
\end{cmhtcbraster}
\end{example}
\begin{example}
Let's have another demonstration; consider the file given in \cref{lst:finetuning2}, together with its
default output using the command
\begin{commandshell}
latexindent.pl finetuning2.tex
\end{commandshell}
is given in \cref{lst:finetuning2-default}.
\begin{cmhtcbraster}[raster column skip=.01\linewidth,
raster left skip=-3.75cm,
raster right skip=0cm,]
\cmhlistingsfromfile*{demonstrations/finetuning2.tex}{\texttt{finetuning2.tex}}{lst:finetuning2}
\cmhlistingsfromfile*{demonstrations/finetuning2-default.tex}{\texttt{finetuning2.tex} default}{lst:finetuning2-default}
\end{cmhtcbraster}
It's clear from \cref{lst:finetuning2-default} that the indentation scheme has not worked as
expected. We can \emph{fine tune} the indentation scheme by employing the settings
given in \cref{lst:fine-tuning2} and running the command
\begin{commandshell}
latexindent.pl finetuning2.tex -l=fine-tuning2.yaml
\end{commandshell}
and the associated (desired) output is given in \cref{lst:finetuning2-mod1}.
\begin{cmhtcbraster}[raster column skip=.01\linewidth,
raster left skip=-3.75cm,
raster right skip=0cm,]
\cmhlistingsfromfile*{demonstrations/finetuning2-mod1.tex}{\texttt{finetuning2.tex} using \cref{lst:fine-tuning2}}{lst:finetuning2-mod1}
\cmhlistingsfromfile*[style=yaml-LST]*{demonstrations/fine-tuning2.yaml}[yaml-TCB]{\texttt{finetuning2.yaml}}{lst:fine-tuning2}
\end{cmhtcbraster}
In particular, note that the settings in \cref{lst:fine-tuning2} specify that \texttt{NamedGroupingBracesBrackets}
and \texttt{UnNamedGroupingBracesBrackets} can follow \texttt{"} and that we allow \lstinline!---! between arguments.
\end{example}
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