Cfxtrjtrk

I have a problem with capturing returned value of my command.

Here is my preamble with command definition:

documentclass[convert={density=300,size=800x600,outext=.png}]{standalone}

usepackage[utf8]{inputenc}

usepackage{tikz}



% Font used for writing commands.

defcmdFont{fontsize{10}{12}selectfont}



% Commands.

defcmdOne  {cmdFont aaa}

defcmdTwo  {cmdFont bbbbb}

defcmdThree{cmdFont cccc}



% Function which returns maximum width needed to write any of provided arguments.

makeatletter



    newlength{textLength@getMaximumWidthHelper}

    newlength{textLength@getMaximumWidth}



    newcommand{getMaximumWidthHelper}[2]

    {%

        settowidth{textLength@getMaximumWidthHelper}{pgfinterruptpicture #2endpgfinterruptpicture}%



        pgfmathparse{max(#1,textLength@getMaximumWidthHelper)}%

        @ifnextcharbgroup{getMaximumWidthHelper{pgfmathresult pt}}{pgfmathresult pt}%

    }%



    newcommand{getMaximumWidth}[1]

    {%

        settowidth{textLength@getMaximumWidth}{pgfinterruptpicture #1endpgfinterruptpicture}%

        @ifnextcharbgroup{getMaximumWidthHelper{thetextLength@getMaximumWidth}}{thetextLength@getMaximumWidth}%

    }%



makeatother

Working example used to test the above command:

begin{document}



    getMaximumWidth{cmdOne}

    getMaximumWidth{cmdOne}{cmdTwo}

    getMaximumWidth{cmdOne}{cmdTwo}{cmdThree}



end{document}

However, when I try to capture the output of getMaximumWidth, it doesn't work as expected.

begin{document}



    newlength{maximumWidth}

    setlength{maximumWidth}{getMaximumWidth{cmdOne}{cmdTwo}{cmdThree}}

    themaximumWidth



end{document}

On the second line, the return value of getMaximumWidth is not captured but instantly printed.

Afterwards I get an error:

! Missing number, treated as
zero.

After that, the third line just prints default value 0.0pt.

What is the proper way to capture the output of getMaximumWidth?

P.S. This is my first time writing Latex document, feel free to point out anything i could've done better.

I would write this something like

documentclass{article}



newcommandcmdFont{fontsize{10}{12}selectfont}% this is the default anyway



% Commands.

newcommandcmdOne  {cmdFont aaa}

newcommandcmdTwo  {cmdFont bbbbb}

newcommandcmdThree{cmdFont cccc}





newlength{maximumWidth}



newcommand{getMaximumWidth}[1]{%

settowidthmaximumWidth{begin{tabular}{@{}l@{}}#1end{tabular}}}



begin{document}



getMaximumWidth{cmdOne\ cmdTwo\ cmdThree}



themaximumWidth



end{document}

I'd generalize settowidth and, by the way, get also height and depth for free.

documentclass{article}

usepackage{xparse}



ExplSyntaxOn

NewDocumentCommand{settomaximumwidth}{mm}

 {% #1 = length, #2 = comma separated list of objects

  iskustvo_settomaxdim:Nnn settowidth { #1 } { #2 }

 }

NewDocumentCommand{settomaximumheight}{mm}

 {% #1 = length, #2 = comma separated list of objects

  iskustvo_settomaxdim:Nnn settoheight { #1 } { #2 }

 }

NewDocumentCommand{settomaximumdepth}{mm}

 {% #1 = length, #2 = comma separated list of objects

  iskustvo_settomaxdim:Nnn settodepth { #1 } { #2 }

 }



dim_new:N l__iskustvo_tempa_dim

dim_new:N l__iskustvo_tempb_dim

tl_new:N l__iskustvo_temp_tl



cs_new_protected:Nn iskustvo_settomaxdim:Nnn

 {

  dim_zero:N l__iskustvo_tempa_dim

  clist_map_variable:nNn { #3 } l__iskustvo_temp_tl

   { __iskustvo_measure:N #1 }

  dim_set_eq:NN #2 l__iskustvo_tempa_dim

 }

cs_new_protected:Nn __iskustvo_measure:N

 {

  #1{l__iskustvo_tempb_dim}{l__iskustvo_temp_tl}

  dim_set:Nn l__iskustvo_tempa_dim

   {

    dim_max:nn { l__iskustvo_tempa_dim } { l__iskustvo_tempb_dim }

   }

 } 

ExplSyntaxOff



% Font used for writing commands.

defcmdFont{fontsize{10}{12}selectfont}



% Commands.

defcmdOne  {cmdFont aaa}

defcmdTwo  {cmdFont bbbbb}

defcmdThree{cmdFont cccc}



begin{document}



newlength{test}



settomaximumwidth{test}{cmdOne,cmdTwo,cmdThree}

thetest



settomaximumheight{test}{cmdOne,cmdTwo,cmdThree}

thetest



settomaximumdepth{test}{cmdOne,cmdTwo,cmdThree}

thetest



end{document}