% arara: pdflatex: {shell: yes, files: [latexindent]} \section{defaultSettings.yaml}\label{sec:defuseloc} \texttt{latexindent.pl} loads its settings from \texttt{defaultSettings.yaml}. The idea is to separate the behaviour of the script from the internal working -- this is very similar to the way that we separate content from form when writing our documents in \LaTeX. If you look in \texttt{defaultSettings.yaml} you'll find the switches that govern the behaviour of \texttt{latexindent.pl}. If you're not sure where \texttt{defaultSettings.yaml} resides on your computer, don't worry as \texttt{indent.log} will tell you where to find it. \texttt{defaultSettings.yaml} is commented, but here is a description of what each switch is designed to do. The default value is given in each case; whenever you see \emph{integer} in \emph{this} section, assume that it must be greater than or equal to \texttt{0} unless otherwise stated. \yamltitle{fileExtensionPreference}*{fields} \texttt{latexindent.pl} can be called to act on a file without specifying the file extension. For example we can call \begin{commandshell} latexindent.pl myfile \end{commandshell} \begin{wrapfigure}[8]{r}[0pt]{6cm} \cmhlistingsfromfile[style=fileExtensionPreference]{../defaultSettings.yaml}[width=.8\linewidth,before=\centering,yaml-TCB]{\texttt{fileExtensionPreference}}{lst:fileExtensionPreference} \end{wrapfigure} in which case the script will look for \texttt{myfile} with the extensions specified in \texttt{fileExtensionPreference} in their numeric order. If no match is found, the script will exit. As with all of the fields, you should change and/or add to this as necessary. Calling \texttt{latexindent.pl myfile} with the (default) settings specified in \cref{lst:fileExtensionPreference} means that the script will first look for \texttt{myfile.tex}, then \texttt{myfile.sty}, \texttt{myfile.cls}, and finally \texttt{myfile.bib} in order\footnote{Throughout this manual, listings shown with line numbers represent code taken directly from \texttt{defaultSettings.yaml}.}. \yamltitle{backupExtension}*{extension name} If you call \texttt{latexindent.pl} with the \texttt{-w} switch (to overwrite \texttt{myfile.tex}) then it will create a backup file before doing any indentation; the default extension is \texttt{.bak}, so, for example, \texttt{myfile.bak0} would be created when calling \texttt{latexindent.pl myfile.tex} for the first time. By default, every time you subsequently call \texttt{latexindent.pl} with the \texttt{-w} to act upon \texttt{myfile.tex}, it will create successive back up files: \texttt{myfile.bak1}, \texttt{myfile.bak2}, etc. \yamltitle{onlyOneBackUp}*{integer} \label{page:onlyonebackup} If you don't want a backup for every time that you call \texttt{latexindent.pl} (so you don't want \texttt{myfile.bak1}, \texttt{myfile.bak2}, etc) and you simply want \texttt{myfile.bak} (or whatever you chose \texttt{backupExtension} to be) then change \texttt{onlyOneBackUp} to \texttt{1}; the default value of \texttt{onlyOneBackUp} is \texttt{0}. \yamltitle{maxNumberOfBackUps}*{integer} Some users may only want a finite number of backup files, say at most $3$, in which case, they can change this switch. The smallest value of \texttt{maxNumberOfBackUps} is $0$ which will \emph{not} prevent backup files being made; in this case, the behaviour will be dictated entirely by \texttt{onlyOneBackUp}. The default value of \texttt{maxNumberOfBackUps} is \texttt{0}. \yamltitle{cycleThroughBackUps}*{integer} Some users may wish to cycle through backup files, by deleting the oldest backup file and keeping only the most recent; for example, with \texttt{maxNumberOfBackUps: 4}, and \texttt{cycleThroughBackUps} set to \texttt{1} then the \texttt{copy} procedure given below would be obeyed. \begin{commandshell} copy myfile.bak1 to myfile.bak0 copy myfile.bak2 to myfile.bak1 copy myfile.bak3 to myfile.bak2 copy myfile.bak4 to myfile.bak3 \end{commandshell} The default value of \texttt{cycleThroughBackUps} is \texttt{0}. \yamltitle{logFilePreferences}*{fields} \begin{wrapfigure}[10]{r}[0pt]{9cm} \cmhlistingsfromfile[style=logFilePreferences,]{../defaultSettings.yaml}[width=.85\linewidth,before=\centering,yaml-TCB]{\texttt{logFilePreferences}}{lst:logFilePreferences} \end{wrapfigure} \texttt{latexindent.pl} writes information to \texttt{indent.log}, some of which can be customized by changing \texttt{logFilePreferences}; see \cref{lst:logFilePreferences}. If you load your own user settings (see \vref{sec:indentconfig}) then \texttt{latexindent.pl} will detail them in \texttt{indent.log}; you can choose not to have the details logged by switching \texttt{showEveryYamlRead} to \texttt{0}. Once all of your settings have been loaded, you can see the amalgamated settings in the log file by switching \texttt{showAmalgamatedSettings} to \texttt{1}, if you wish. The log file will end with the characters given in \texttt{endLogFileWith}, and will report the \texttt{GitHub} address of \texttt{latexindent.pl} to the log file if \texttt{showGitHubInfoFooter} is set to \texttt{1}. \yamltitle{verbatimEnvironments}*{fields} A field that contains a list of environments that you would like left completely alone -- no indentation will be performed on environments that you have specified in this field, see \cref{lst:verbatimEnvironments}. \begin{minipage}{.45\textwidth} \cmhlistingsfromfile[style=verbatimEnvironments]{../defaultSettings.yaml}[width=.8\linewidth,before=\centering,yaml-TCB]{\texttt{verbatimEnvironments}}{lst:verbatimEnvironments} \end{minipage}% \hfill \begin{minipage}{.45\textwidth} \cmhlistingsfromfile[style=verbatimCommands]{../defaultSettings.yaml}[width=.8\linewidth,before=\centering,yaml-TCB]{\texttt{verbatimCommands}}{lst:verbatimCommands} \end{minipage}% Note that if you put an environment in \texttt{verbatimEnvironments} and in other fields such as \texttt{lookForAlignDelims} or \texttt{noAdditionalIndent} then \texttt{latexindent.pl} will \emph{always} prioritize \texttt{verbatimEnvironments}. \yamltitle{verbatimCommands}*{fields} A field that contains a list of commands that are verbatim commands, for example \lstinline|\lstinline|; any commands populated in this field are protected from line breaking routines (only relevant if the \texttt{-m} is active, see \vref{sec:modifylinebreaks}). \yamltitle{noIndentBlock}*{fields} \begin{wrapfigure}[8]{r}[0pt]{6cm} \cmhlistingsfromfile[style=noIndentBlock]{../defaultSettings.yaml}[width=.8\linewidth,before=\centering,yaml-TCB]{\texttt{noIndentBlock}}{lst:noIndentBlock} \end{wrapfigure} If you have a block of code that you don't want \texttt{latexindent.pl} to touch (even if it is \emph{not} a verbatim-like environment) then you can wrap it in an environment from \texttt{noIndentBlock}; you can use any name you like for this, provided you populate it as demonstrate in \cref{lst:noIndentBlock}. Of course, you don't want to have to specify these as null environments in your code, so you use them with a comment symbol, \lstinline!%!, followed by as many spaces (possibly none) as you like; see \cref{lst:noIndentBlockdemo} for example. \begin{cmhlistings}[style=demo,escapeinside={(*@}{@*)}]{\texttt{noIndentBlock} demonstration}{lst:noIndentBlockdemo} %(*@@*) \begin{noindent} this code won't be touched by latexindent.pl! %(*@@*)\end{noindent} \end{cmhlistings} \yamltitle{removeTrailingWhitespace}*{fields}\label{yaml:removeTrailingWhitespace} \begin{wrapfigure}[10]{r}[0pt]{7cm} \cmhlistingsfromfile[style=removeTrailingWhitespace]{../defaultSettings.yaml}[width=.8\linewidth,before=\centering,yaml-TCB]{removeTrailingWhitespace}{lst:removeTrailingWhitespace} \vspace{.1cm} \begin{yaml}[numbers=none]{removeTrailingWhitespace (alt)}[width=.8\linewidth,before=\centering]{lst:removeTrailingWhitespace-alt} removeTrailingWhitespace: 1 \end{yaml} \end{wrapfigure} Trailing white space can be removed both \emph{before} and \emph{after} processing the document, as detailed in \cref{lst:removeTrailingWhitespace}; each of the fields can take the values \texttt{0} or \texttt{1}. See \vref{lst:removeTWS-before,lst:env-mlb5-modAll,lst:env-mlb5-modAll-remove-WS} for before and after results. Thanks to \cite{vosskuhle} for providing this feature. You can specify \texttt{removeTrailingWhitespace} simply as \texttt{0} or \texttt{1}, if you wish; in this case, \announce{2017-06-28}{removeTrailingWhitespace} \texttt{latexindent.pl} will set both \texttt{beforeProcessing} and \texttt{afterProcessing} to the value you specify; see \cref{lst:removeTrailingWhitespace-alt}. \yamltitle{fileContentsEnvironments}*{field} \begin{wrapfigure}[6]{r}[0pt]{6cm} \cmhlistingsfromfile[style=fileContentsEnvironments]{../defaultSettings.yaml}[width=.8\linewidth,before=\centering,yaml-TCB]{\texttt{fileContentsEnvironments}}{lst:fileContentsEnvironments} \end{wrapfigure} Before \texttt{latexindent.pl} determines the difference between preamble (if any) and the main document, it first searches for any of the environments specified in \texttt{fileContentsEnvironments}, see \cref{lst:fileContentsEnvironments}. The behaviour of \texttt{latexindent.pl} on these environments is determined by their location (preamble or not), and the value \texttt{indentPreamble}, discussed next. \yamltitle{indentPreamble}{0|1} The preamble of a document can sometimes contain some trickier code for \texttt{latexindent.pl} to operate upon. By default, \texttt{latexindent.pl} won't try to operate on the preamble (as \texttt{indentPreamble} is set to \texttt{0}, by default), but if you'd like \texttt{latexindent.pl} to try then change \texttt{indentPreamble} to \texttt{1}. \yamltitle{lookForPreamble}*{fields} \begin{wrapfigure}[8]{r}[0pt]{5cm} \cmhlistingsfromfile[style=lookForPreamble]{../defaultSettings.yaml}[width=.8\linewidth,before=\centering,yaml-TCB]{lookForPreamble}{lst:lookForPreamble} \end{wrapfigure} Not all files contain preamble; for example, \texttt{sty}, \texttt{cls} and \texttt{bib} files typically do \emph{not}. Referencing \cref{lst:lookForPreamble}, if you set, for example, \texttt{.tex} to \texttt{0}, then regardless of the setting of the value of \texttt{indentPreamble}, preamble will not be assumed when operating upon \texttt{.tex} files. \yamltitle{preambleCommandsBeforeEnvironments}{0|1} Assuming that \texttt{latexindent.pl} is asked to operate upon the preamble of a document, when this switch is set to \texttt{0} then environment code blocks will be sought first, and then command code blocks. When this switch is set to \texttt{1}, commands will be sought first. The example that first motivated this switch contained the code given in \cref{lst:motivatepreambleCommandsBeforeEnvironments}. \begin{cmhlistings}{Motivating \texttt{preambleCommandsBeforeEnvironments}}{lst:motivatepreambleCommandsBeforeEnvironments} ... preheadhook={\begin{mdframed}[style=myframedstyle]}, postfoothook=\end{mdframed}, ... \end{cmhlistings} \yamltitle{defaultIndent}*{horizontal space} This is the default indentation (\lstinline!\t! means a tab, and is the default value) used in the absence of other details for the command or environment we are working with; see \texttt{indentRules} in \vref{sec:noadd-indent-rules} for more details. If you're interested in experimenting with \texttt{latexindent.pl} then you can \emph{remove} all indentation by setting \texttt{defaultIndent: ""}. \yamltitle{lookForAlignDelims}*{fields} \begin{wrapfigure}[12]{r}[0pt]{5cm} \begin{yaml}[numbers=none]{\texttt{lookForAlignDelims} (basic)}[width=.8\linewidth,before=\centering]{lst:aligndelims:basic} lookForAlignDelims: tabular: 1 tabularx: 1 longtable: 1 array: 1 matrix: 1 ... \end{yaml} \end{wrapfigure} This contains a list of environments and/or commands that are operated upon in a special way by \texttt{latexindent.pl} (see \cref{lst:aligndelims:basic}). In fact, the fields in \texttt{lookForAlignDelims} can actually take two different forms: the \emph{basic} version is shown in \cref{lst:aligndelims:basic} and the \emph{advanced} version in \cref{lst:aligndelims:advanced}; we will discuss each in turn. The environments specified in this field will be operated on in a special way by \texttt{latexindent.pl}. In particular, it will try and align each column by its alignment tabs. It does have some limitations (discussed further in \cref{sec:knownlimitations}), but in many cases it will produce results such as those in \cref{lst:tabularbefore:basic,lst:tabularafter:basic}. If you find that \texttt{latexindent.pl} does not perform satisfactorily on such environments then you can set the relevant key to \texttt{0}, for example \texttt{tabular: 0}; alternatively, if you just want to ignore \emph{specific} instances of the environment, you could wrap them in something from \texttt{noIndentBlock} (see \vref{lst:noIndentBlock}). \begin{minipage}{.45\textwidth} \cmhlistingsfromfile[showspaces=false,showtabs=false]*{demonstrations/tabular1.tex}{\texttt{tabular1.tex}}{lst:tabularbefore:basic} \end{minipage}% \hfill \begin{minipage}{.45\textwidth} \cmhlistingsfromfile[showspaces=false,showtabs=false]*{demonstrations/tabular1-default.tex}{\texttt{tabular1.tex} default output}{lst:tabularafter:basic} \end{minipage}% If you wish to remove the alignment of the \lstinline!\\! within a delimiter-aligned block, then the advanced form of \texttt{lookForAlignDelims} shown in \cref{lst:aligndelims:advanced} is for you. \cmhlistingsfromfile[style=yaml-LST]{demonstrations/tabular.yaml}[yaml-TCB]{\texttt{tabular.yaml}}{lst:aligndelims:advanced} Note that you can use a mixture of the basic and advanced form: in \cref{lst:aligndelims:advanced} \texttt{tabular} and \texttt{tabularx} are advanced and \texttt{longtable} is basic. When using the advanced form, each field should receive at least 1 sub-field, and \emph{can} (but does not have to) receive any of the following fields: \begin{itemize} \item \texttt{delims}: switch equivalent to simply specifying, for example, \texttt{tabular: 1} in the basic version shown in \cref{lst:aligndelims:basic} (default: 1); \item \texttt{alignDoubleBackSlash}: switch to determine if \lstinline!\\! should be aligned (default: 1); \item \texttt{spacesBeforeDoubleBackSlash}: optionally, specifies the number of spaces to be inserted before (non-aligned) \lstinline!\\!. In order to use this field, \texttt{alignDoubleBackSlash} needs to be set to 0 (default: 0). \item \announce{2017-06-19}{multiColumnGrouping} \texttt{multiColumnGrouping}: details if \texttt{latexindent.pl} should group columns underneath a \lstinline!\multicolumn! command (default: 0); \item \announce{2017-06-19}{alignRowsWithoutMaxDelims} \texttt{alignRowsWithoutMaxDelims}: details if rows that do not contain the maximum number of delimeters should be formatted so as to have the ampersands aligned (default: 1). \end{itemize} Assuming that you have the settings in \cref{lst:aligndelims:advanced} saved in \texttt{tabular.yaml}, and the code from \cref{lst:tabularbefore:basic} in \texttt{tabular1.tex} and you run \begin{commandshell} latexindent.pl -l tabular.yaml tabular1.tex \end{commandshell} then you should receive the before-and-after results shown in \cref{lst:tabularbefore:advanced,lst:tabularafter:advanced}; note that the ampersands have been aligned, but the \lstinline!\\! have not (compare the alignment of \lstinline!\\! in \cref{lst:tabularafter:basic,lst:tabularafter:advanced}). \begin{minipage}{.45\textwidth} \cmhlistingsfromfile[showspaces=false,showtabs=false]*{demonstrations/tabular1.tex}{\texttt{tabular1.tex}}{lst:tabularbefore:advanced} \end{minipage}% \hfill \begin{minipage}{.45\textwidth} \cmhlistingsfromfile[showspaces=false,showtabs=false]*{demonstrations/tabular1-advanced.tex}{\texttt{tabular1.tex} using \cref{lst:aligndelims:advanced}}{lst:tabularafter:advanced} \end{minipage}% Saving \cref{lst:aligndelims:advanced} into \texttt{tabular1.yaml} as in \cref{lst:tabular1YAML}, and running the command \begin{commandshell} latexindent.pl -l tabular1.yaml tabular1.tex \end{commandshell} gives \cref{lst:tabularafter:spacing}; note the spacing before the \lstinline!\\!. \begin{minipage}{.45\textwidth} \cmhlistingsfromfile[showspaces=false,showtabs=false]*{demonstrations/tabular1-advanced-3spaces.tex}{\texttt{tabular1.tex} using \cref{lst:tabular1YAML}}{lst:tabularafter:spacing} \end{minipage}% \hfill \begin{minipage}{.54\textwidth} \cmhlistingsfromfile[style=yaml-LST]{demonstrations/tabular1.yaml}[yaml-TCB]{\texttt{tabular1.yaml}}{lst:tabular1YAML} \end{minipage}% Now consider the file \texttt{tabular2.tex} in \cref{lst:tabular2}, which contains a \lstinline!\multicolumn! command, and the YAML files in \cref{lst:tabular2YAML,lst:tabular3YAML}. \cmhlistingsfromfile[showspaces=false,showtabs=false]*{demonstrations/tabular2.tex}{\texttt{tabular2.tex}}{lst:tabular2} \begin{minipage}{.45\textwidth} \cmhlistingsfromfile[style=yaml-LST]{demonstrations/tabular2.yaml}[yaml-TCB]{\texttt{tabular2.yaml}}{lst:tabular2YAML} \end{minipage}% \hfill \begin{minipage}{.45\textwidth} \cmhlistingsfromfile[style=yaml-LST]{demonstrations/tabular3.yaml}[yaml-TCB]{\texttt{tabular3.yaml}}{lst:tabular3YAML} \end{minipage}% On running the commands \begin{commandshell} latexindent.pl tabular2.tex latexindent.pl -s tabular2.tex -l tabular2.yaml latexindent.pl -s tabular2.tex -l tabular3.yaml \end{commandshell} we obtain the respective outputs given in \cref{lst:tabular2-default,lst:tabular2-mc,lst:tabular2-no-max}. \begin{widepage} \cmhlistingsfromfile[showspaces=false,showtabs=false]*{demonstrations/tabular2-default.tex}{\texttt{tabular2-default.tex}}{lst:tabular2-default} \cmhlistingsfromfile[showspaces=false,showtabs=false]*{demonstrations/tabular2-mc.tex}{\texttt{tabular2-mc.tex}}{lst:tabular2-mc} \cmhlistingsfromfile[showspaces=false,showtabs=false]*{demonstrations/tabular2-no-max.tex}{\texttt{tabular2-no-max.tex}}{lst:tabular2-no-max} \end{widepage} Notice in particular: \begin{itemize} \item in both \cref{lst:tabular2-default,lst:tabular2-mc} all rows have been aligned at the ampersand, even those that do not contain the maximum number of ampersands (3 ampersands, in this case); \item in \cref{lst:tabular2-default} the columns have been aligned at the ampersand; \item in \cref{lst:tabular2-mc} the \lstinline!\multicolumn! command has grouped the $2$ columns beneath \emph{and} above it, because \texttt{multiColumnGrouping} is set to $1$ in \cref{lst:tabular2YAML}; \item in \cref{lst:tabular2-no-max} rows~3 and~6 have \emph{not} been aligned at the ampersand, because \texttt{alignRowsWithoutMaxDelims} has been to set to $0$ in \cref{lst:tabular3YAML}; however, the \lstinline!\\! \emph{have} still been aligned. \end{itemize} As of Version 3.0, the alignment routine works on mandatory and optional arguments within commands, and also within `special' code blocks (see \texttt{specialBeginEnd} on \cpageref{yaml:specialBeginEnd}); for example, assuming that you have a command called \lstinline!\matrix! and that it is populated within \texttt{lookForAlignDelims} (which it is, by default), and that you run the command \begin{commandshell} latexindent.pl matrix1.tex \end{commandshell} then the before-and-after results shown in \cref{lst:matrixbefore,lst:matrixafter} are achievable by default. \begin{minipage}{.45\textwidth} \cmhlistingsfromfile[columns=fixed]{demonstrations/matrix1.tex}{\texttt{matrix1.tex}}{lst:matrixbefore} \end{minipage}% \hfill \begin{minipage}{.45\textwidth} \cmhlistingsfromfile[columns=fixed]{demonstrations/matrix1-default.tex}{\texttt{matrix1.tex} default output}{lst:matrixafter} \end{minipage}% If you have blocks of code that you wish to align at the \& character that are \emph{not} wrapped in, for example, \lstinline!\begin{tabular}! \ldots \lstinline!\end{tabular}!, then you can use the mark up illustrated in \cref{lst:alignmentmarkup}; the default output is shown in \cref{lst:alignmentmarkup-default}. Note that the \lstinline!%*! must be next to each other, but that there can be any number of spaces (possibly none) between the \lstinline!*! and \lstinline!\begin{tabular}!; note also that you may use any environment name that you have specified in \texttt{lookForAlignDelims}. \begin{minipage}{.45\textwidth} \cmhlistingsfromfile[columns=fixed]{demonstrations/align-block.tex}{\texttt{align-block.tex}}{lst:alignmentmarkup} \end{minipage}% \hfill \begin{minipage}{.45\textwidth} \cmhlistingsfromfile[columns=fixed]{demonstrations/align-block-default.tex}{\texttt{align-block.tex} default output}{lst:alignmentmarkup-default} \end{minipage}% With reference to \vref{tab:code-blocks} and the, yet undiscussed, fields of \texttt{noAdditionalIndent} and \texttt{indentRules} (see \vref{sec:noadd-indent-rules}), these comment-marked blocks are considered \texttt{environments}. \yamltitle{indentAfterItems}*{fields} \begin{wrapfigure}[5]{r}[0pt]{7cm} \cmhlistingsfromfile[style=indentAfterItems]{../defaultSettings.yaml}[width=.8\linewidth,before=\centering,yaml-TCB]{\texttt{indentAfterItems}}{lst:indentafteritems} \end{wrapfigure} The environment names specified in \texttt{indentAfterItems} tell \texttt{latexindent.pl} to look for \lstinline!\item! commands; if these switches are set to \texttt{1} then indentation will be performed so as indent the code after each \texttt{item}. A demonstration is given in \cref{lst:itemsbefore,lst:itemsafter} \begin{minipage}{.45\textwidth} \cmhlistingsfromfile{demonstrations/items1.tex}{\texttt{items1.tex}}{lst:itemsbefore} \end{minipage}% \hfill \begin{minipage}{.45\textwidth} \cmhlistingsfromfile{demonstrations/items1-default.tex}{\texttt{items1.tex} default output}{lst:itemsafter} \end{minipage} \yamltitle{itemNames}*{fields} \begin{wrapfigure}[5]{r}[0pt]{5cm} \cmhlistingsfromfile[style=itemNames]{../defaultSettings.yaml}[width=.8\linewidth,before=\centering,yaml-TCB]{\texttt{itemNames}}{lst:itemNames} \end{wrapfigure} If you have your own \texttt{item} commands (perhaps you prefer to use \texttt{myitem}, for example) then you can put populate them in \texttt{itemNames}. For example, users of the \texttt{exam} document class might like to add \texttt{parts} to \texttt{indentAfterItems} and \texttt{part} to \texttt{itemNames} to their user settings (see \vref{sec:indentconfig} for details of how to configure user settings, and \vref{lst:mysettings} \\ in particular \label{page:examsettings}.) \yamltitle{specialBeginEnd}*{fields}\label{yaml:specialBeginEnd} The fields specified% \announce*{2017-08-21}*{specialBeginEnd} in \texttt{specialBeginEnd} are, in their default state, focused on math mode begin and end statements, but there is no requirement for this to be the case; \cref{lst:specialBeginEnd} shows the default settings of \texttt{specialBeginEnd}. \cmhlistingsfromfile*[style=specialBeginEnd]{../defaultSettings.yaml}[width=.8\linewidth,before=\centering,yaml-TCB]{\texttt{specialBeginEnd}}{lst:specialBeginEnd} The field \texttt{displayMath} represents \lstinline!\[...\]!, \texttt{inlineMath} represents \lstinline!$...$! and \texttt{displayMathTex} represents \lstinline!$$...$$!. You can, of course, rename these in your own YAML files (see \vref{sec:localsettings}); indeed, you might like to set up your own special begin and end statements. A demonstration of the before-and-after results are shown in \cref{lst:specialbefore,lst:specialafter}. \begin{minipage}{.45\textwidth} \cmhlistingsfromfile{demonstrations/special1.tex}{\texttt{special1.tex} before}{lst:specialbefore} \end{minipage}% \hfill \begin{minipage}{.45\textwidth} \cmhlistingsfromfile{demonstrations/special1-default.tex}{\texttt{special1.tex} default output}{lst:specialafter} \end{minipage} For each field, \texttt{lookForThis} is set to \texttt{1} by default, which means that \texttt{latexindent.pl} will look for this pattern; you can tell \texttt{latexindent.pl} not to look for the pattern, by setting \texttt{lookForThis} to \texttt{0}. There are% \announce*{2017-08-21}{specialBeforeCommand} examples in which it is advantageous to search for \texttt{specialBeginEnd} fields \emph{before} searching for commands, and the \texttt{specialBeforeCommand} switch controls this behaviour. For example, consider the file shown in \cref{lst:specialLRbefore}. \cmhlistingsfromfile*{demonstrations/specialLR.tex}{\texttt{specialLR.tex}}{lst:specialLRbefore} Now consider the YAML files shown in \cref{lst:specialsLeftRight-yaml,lst:specialBeforeCommand-yaml} \begin{minipage}{.49\linewidth} \cmhlistingsfromfile*{demonstrations/specialsLeftRight.yaml}[width=.8\linewidth,before=\centering,yaml-TCB]{\texttt{specialsLeftRight.yaml}}{lst:specialsLeftRight-yaml} \end{minipage} \hfill \begin{minipage}{.49\linewidth} \cmhlistingsfromfile*{demonstrations/specialBeforeCommand.yaml}[width=.8\linewidth,before=\centering,yaml-TCB]{\texttt{specialBeforeCommand.yaml}}{lst:specialBeforeCommand-yaml} \end{minipage} Upon running the following commands \begin{widepage} \begin{commandshell} latexindent.pl specialLR.tex -l=specialsLeftRight.yaml latexindent.pl specialLR.tex -l=specialsLeftRight.yaml,specialBeforeCommand.yaml \end{commandshell} \end{widepage} we receive the respective outputs in \cref{lst:specialLR-comm-first-tex,lst:specialLR-special-first-tex}. \begin{minipage}{.49\linewidth} \cmhlistingsfromfile*{demonstrations/specialLR-comm-first.tex}{\texttt{specialLR.tex} using \cref{lst:specialsLeftRight-yaml}}{lst:specialLR-comm-first-tex} \end{minipage} \hfill \begin{minipage}{.49\linewidth} \cmhlistingsfromfile*{demonstrations/specialLR-special-first.tex}{\texttt{specialLR.tex} using \cref{lst:specialsLeftRight-yaml,lst:specialBeforeCommand-yaml}}{lst:specialLR-special-first-tex} \end{minipage} Notice that in: \begin{itemize} \item \cref{lst:specialLR-comm-first-tex} the \lstinline!\left! has been treated as a \emph{command}, with one optional argument; \item \cref{lst:specialLR-special-first-tex} the \texttt{specialBeginEnd} pattern in \cref{lst:specialsLeftRight-yaml} has been obeyed because \cref{lst:specialBeforeCommand-yaml} specifies that the \texttt{specialBeginEnd} should be sought \emph{before} commands. \end{itemize} \yamltitle{indentAfterHeadings}*{fields} \begin{wrapfigure}[17]{r}[0pt]{8cm} \cmhlistingsfromfile[style=indentAfterHeadings]{../defaultSettings.yaml}[width=.8\linewidth,before=\centering,yaml-TCB]{\texttt{indentAfterHeadings}}{lst:indentAfterHeadings} \end{wrapfigure} This field enables the user to specify indentation rules that take effect after heading commands such as \lstinline!\part!, \lstinline!\chapter!, \lstinline!\section!, \lstinline!\subsection*!, or indeed any user-specified command written in this field.\footnote{There is a slight difference in interface for this field when comparing Version 2.2 to Version 3.0; see \vref{app:differences} for details.} The default settings do \emph{not} place indentation after a heading, but you can easily switch them on by changing \\ \texttt{indentAfterThisHeading: 0} to \\ \texttt{indentAfterThisHeading: 1}. The \texttt{level} field tells \texttt{latexindent.pl} the hierarchy of the heading structure in your document. You might, for example, like to have both \texttt{section} and \texttt{subsection} set with \texttt{level: 3} because you do not want the indentation to go too deep. You can add any of your own custom heading commands to this field, specifying the \texttt{level} as appropriate. You can also specify your own indentation in \texttt{indentRules} (see \vref{sec:noadd-indent-rules}); you will find the default \texttt{indentRules} contains \lstinline!chapter: " "! which tells \texttt{latexindent.pl} simply to use a space character after \texttt{\chapter} headings (once \texttt{indent} is set to \texttt{1} for \texttt{chapter}). For example, assuming that you have the code in \cref{lst:headings1yaml} saved into \texttt{headings1.yaml}, and that you have the text from \cref{lst:headings1} saved into \texttt{headings1.tex}. \begin{minipage}{.45\textwidth} \cmhlistingsfromfile[style=yaml-LST]{demonstrations/headings1.yaml}[yaml-TCB]{\texttt{headings1.yaml}}{lst:headings1yaml} \end{minipage}% \hfill \begin{minipage}{.45\textwidth} \cmhlistingsfromfile{demonstrations/headings1.tex}{\texttt{headings1.tex}}{lst:headings1} \end{minipage} If you run the command \begin{commandshell} latexindent.pl headings1.tex -l=headings1.yaml \end{commandshell} then you should receive the output given in \cref{lst:headings1-mod1}. \begin{minipage}{.45\textwidth} \cmhlistingsfromfile{demonstrations/headings1-mod1.tex}{\texttt{headings1.tex} using \cref{lst:headings1yaml}}{lst:headings1-mod1} \end{minipage}% \hfill \begin{minipage}{.45\textwidth} \cmhlistingsfromfile{demonstrations/headings1-mod2.tex}{\texttt{headings1.tex} second modification}{lst:headings1-mod2} \end{minipage} Now say that you modify the \texttt{YAML} from \cref{lst:headings1yaml} so that the \texttt{paragraph} \texttt{level} is \texttt{1}; after running \begin{commandshell} latexindent.pl headings1.tex -l=headings1.yaml \end{commandshell} you should receive the code given in \cref{lst:headings1-mod2}; notice that the \texttt{paragraph} and \texttt{subsection} are at the same indentation level. \yamltitle{maximumIndentation}*{horizontal space} You can control the maximum indentation given to your file by% \announce*{2017-08-21}{maximumIndentation} specifying the \texttt{maximumIndentation} field as horizontal space (but \emph{not} including tabs). This feature uses the \texttt{Text::Tabs} module \cite{texttabs}, and is \emph{off} by default. For example, consider the example shown in \cref{lst:mult-nested} together with the default output shown in \cref{lst:mult-nested-default}. \begin{minipage}{.45\textwidth} \cmhlistingsfromfile*{demonstrations/mult-nested.tex}{\texttt{mult-nested.tex}}{lst:mult-nested} \end{minipage}% \hfill \begin{minipage}{.45\textwidth} \cmhlistingsfromfile*{demonstrations/mult-nested-default.tex}{\texttt{mult-nested.tex} default output}{lst:mult-nested-default} \end{minipage} Now say that, for example, you have the \texttt{max-indentation1.yaml} from \cref{lst:max-indentation1yaml} and that you run the following command: \begin{commandshell} latexindent.pl mult-nested.tex -l=max-indentation1 \end{commandshell} You should receive the output shown in \cref{lst:mult-nested-max-ind1}. \begin{minipage}{.45\textwidth} \cmhlistingsfromfile*[style=yaml-LST]{demonstrations/max-indentation1.yaml}[yaml-TCB]{\texttt{max-indentation1.yaml}}{lst:max-indentation1yaml} \end{minipage}% \hfill \begin{minipage}{.45\textwidth} \cmhlistingsfromfile*{demonstrations/mult-nested-max-ind1.tex}{\texttt{mult-nested.tex} using \cref{lst:max-indentation1yaml}}{lst:mult-nested-max-ind1} \end{minipage} Comparing the output in \cref{lst:mult-nested-default,lst:mult-nested-max-ind1} we notice that the (default) tabs of indentation have been replaced by a single space. In general, when using the \texttt{maximumIndentation} feature, any leading tabs will be replaced by equivalent spaces except, of course, those found in \texttt{verbatimEnvironments} (see \vref{lst:verbatimEnvironments}) or \texttt{noIndentBlock} (see \vref{lst:noIndentBlock}). \subsection{The code blocks known \texttt{latexindent.pl}}\label{subsubsec:code-blocks} As of Version 3.0, \texttt{latexindent.pl} processes documents using code blocks; each of these are shown in \cref{tab:code-blocks}. \begin{table}[!htp] \begin{widepage} \centering \caption{Code blocks known to \texttt{latexindent.pl}}\label{tab:code-blocks} \begin{tabular}{m{.3\linewidth}@{\hspace{.25cm}}m{.4\linewidth}@{\hspace{.25cm}}m{.2\linewidth}} \toprule Code block & characters allowed in name & example \\ \midrule environments & \lstinline!a-zA-Z@\*0-9_\\! & \begin{lstlisting}[,nolol=true,] \begin{myenv} body of myenv \end{myenv} \end{lstlisting} \\\cmidrule{2-3} optionalArguments & \emph{inherits} name from parent (e.g environment name) & \begin{lstlisting}[,nolol=true,] [ opt arg text ] \end{lstlisting} \\\cmidrule{2-3} mandatoryArguments & \emph{inherits} name from parent (e.g environment name) & \begin{lstlisting}[,nolol=true,] { mand arg text } \end{lstlisting} \\\cmidrule{2-3} commands & \lstinline!+a-zA-Z@\*0-9_\:! & \lstinline!\mycommand!$\langle$\itshape{arguments}$\rangle$ \\\cmidrule{2-3} keyEqualsValuesBracesBrackets & \lstinline!a-zA-Z@\*0-9_\/.\h\{\}:\#-! & \lstinline!my key/.style=!$\langle$\itshape{arguments}$\rangle$ \\\cmidrule{2-3} namedGroupingBracesBrackets & \lstinline!a-zA-Z@\*>