How to omit vertical realignment when using cmidrule in different colors AND widths

Question

The problem

Let's say I want to have more than rules in two different colors in the same row ... how can I make it work?

Here is a minimal example:

\documentclass{article}
\usepackage{colortbl}
\usepackage{booktabs}
\begin{document}
\begin{table}[ht]
    \begin{tabular}{llll}
        \toprule
        A & B & alpha & beta\\
        \arrayrulecolor{black} \cmidrule[1pt](l){1-1} \arrayrulecolor{red} \cmidrule[1pt](r){2-2} \arrayrulecolor{black} \cmidrule[1pt](l){3-3} \arrayrulecolor{black} \cmidrule[1pt](r){4-4}
        1 & 5 & 10 &    100\\
        2 & 6 & 11 &    101\\
        2 & 7 & 12 &    102\\
        3 & 8 & 13 &    103\\
        \bottomrule
    \end{tabular}
\end{table}


\end{document}

What happens is that with each call of \arrayrulecolor{}, the corresponding cmidrule is moved down.

The solution is a macro that corrects the positioning, but there is a problem with it.

The problem with the earlier solution

The solution mentioned here: How to omit vertical realignment when using cmidrule in different colors? does not handle varying widths correctly

\documentclass{article}
\usepackage{colortbl}
\usepackage{booktabs}
\newcommand{\corcmidrule}[1][2pt]{% \corcmidrule[<len>]
    \[\dimexpr-\normalbaselineskip-\belowrulesep-\aboverulesep-#1\relax]%
}
\begin{document}
\begin{table}[ht]
    \begin{tabular}{llll}
        \toprule
        A &amp; B &amp; alpha &amp; beta\\
        \arrayrulecolor{black}\cmidrule[1pt](l){1-1} 
        \corcmidrule[2pt]\arrayrulecolor{black}\cmidrule[2pt](r){2-2} 
        \corcmidrule[5pt]\arrayrulecolor{black}\cmidrule[5pt](l){3-3} 
        \corcmidrule[1pt]\arrayrulecolor{black}\cmidrule[1pt](r){4-4}
        1 &amp; 5 &amp; 10 &amp;    100\\
        2 &amp; 6 &amp; 11 &amp;    101\\
        2 &amp; 7 &amp; 12 &amp;    102\\
        3 &amp; 8 &amp; 13 &amp;    103\\
        \bottomrule
    \end{tabular}
\end{table}


\end{document}

What's wrong with this? Consider what it looks like without the macro:

\documentclass{article}
\usepackage{colortbl}
\usepackage{booktabs}
\newcommand{\corcmidrule}[1][2pt]{% \corcmidrule[<len>]
    \[\dimexpr-\normalbaselineskip-\belowrulesep-\aboverulesep-#1\relax]%
}
\begin{document}
\begin{table}[ht]
    \begin{tabular}{llll}
        \toprule
        A &amp; B &amp; alpha &amp; beta\\
        \arrayrulecolor{black}\cmidrule[1pt](l){1-1} 
        \cmidrule[2pt](r){2-2} 
        \cmidrule[5pt](l){3-3} 
        \cmidrule[1pt](r){4-4}
        1 &amp; 5 &amp; 10 &amp;    100\\
        2 &amp; 6 &amp; 11 &amp;    101\\
        2 &amp; 7 &amp; 12 &amp;    102\\
        3 &amp; 8 &amp; 13 &amp;    103\\
        \bottomrule
    \end{tabular}
\end{table}


\end{document}

It seems that these would be the right adjustments.

\begin{table}[ht]
    \begin{tabular}{llll}
        \toprule
        A & B & alpha & beta\\
                         \arrayrulecolor{black}\cmidrule[1pt](l){1-1} 
        \corcmidrule[1pt]\arrayrulecolor{black}\cmidrule[2pt](r){2-2} 
        \corcmidrule[3pt]\arrayrulecolor{black}\cmidrule[5pt](l){3-3} 
        \corcmidrule[5pt]\arrayrulecolor{black}\cmidrule[1pt](r){4-4}
        1 & 5 & 10 &    100\\
        2 & 6 & 11 &    101\\
        2 & 7 & 12 &    102\\
        3 & 8 & 13 &    103\\
        \bottomrule
    \end{tabular}
\end{table}

A bigger example

\begin{table}[ht]
    \begin{tabular}{lllll}
        \toprule
        A & B & alpha & beta & gamma\\
        \arrayrulecolor{black}\cmidrule[1pt](l){1-1} 
        \corcmidrule[1pt]\arrayrulecolor{black}\cmidrule[2pt](){2-2} 
        \corcmidrule[2pt]\arrayrulecolor{black}\cmidrule[2pt](){3-3} 
        \corcmidrule[2pt]\arrayrulecolor{black}\cmidrule[5pt](){4-4} 
        \corcmidrule[5pt]\arrayrulecolor{black}\cmidrule[1pt](){5-5}
        1 & 5 & 10 &    100 & 1\\
        2 & 6 & 11 &    101 & 1\\
        2 & 7 & 12 &    102 & 1\\
        3 & 8 & 13 &    103 & 1\\
        \bottomrule
    \end{tabular}
\end{table}

Could this be put into a macro? One needs to pull the width of the previous rule.

Answer 1

Here is a programmation of a command \MyRule which might do the job in the environments {NiceTabular} of nicematrix.

The syntax of \MyRule is as follow : \MyRule[#1](#2){#3-#4}

The arguments #1 and #2 are optional.

• #1 is a list of key-value pairs. As of now, there is two keys: color and width;
• #2 contains r, l or both (for specifying trimming);
• #3 is the number of the first column;
• #4 is the number of the last column.

---

\documentclass{article}
\usepackage{nicematrix}
\usepackage{tikz}
\ExplSyntaxOn
\keys_define:nn { MyRule }
  {
    color .tl_set:N = \l__MyRule_color_tl , 
    color .value_required:n = true ,
    width .dim_set:N = \l__MyRule_width_dim ,
    width .value_required:n = true ,
    width .initial:n = \arrayrulewidth ,
    style .value_required:n = true ,
    style .tl_set:N = \l__MyRule_style_tl
  }
\NewDocumentCommand { \MyRule } { O { } D ( ) { } m }
  {
    \exp_args:Nx __MyRule_i:nnnn 
    { \int_use:c { c@iRow } } { #1 } { #2 } { #3 } 
  }
\cs_new_protected:Nn __MyRule_i:nnnn
  {
    \tl_gput_right:Nn \g_nicematrix_code_after_tl 
      { __MyRule_ii:nnnn { #1 } { #2 } { #3 } { #4 } }
    \peek_remove_spaces:n { }
  }
\cs_new_protected:Nn __MyRule_ii:nnnn
  {
    \group_begin:
    \keys_set:nn { MyRule } { #2 }
    __MyRule_iii:w #4 \q_stop
    \begin { tikzpicture }
    \pgfsetlinewidth { \l__MyRule_width_dim }
    \tl_if_empty:NF \l__MyRule_color_tl

      { \pgfsetstrokecolor { \l__MyRule_color_tl } }
    \tl_if_in:nnTF { #3 } { l }
      { \dim_set:Nn \l_tmpa_dim { 1 mm } }
      { \dim_zero:N \l_tmpa_dim }
    \tl_if_in:nnTF { #3 } { r }
      { \dim_set:Nn \l_tmpa_dim { 1 mm } }
      { \dim_zero:N \l_tmpa_dim }
    \tl_if_empty:NF \l__MyRule_line_style_tl
      { \tikzset { every~path/.style = \l__MyRule_style_tl  } }
    \draw ([xshift=\l_tmpa_dim,yshift=-\l__MyRule_width_dim/2] #1 
             -| \int_use:N \l_tmpa_int ) --
          ([xshift=-\l_tmpa_dim,yshift=-\l__MyRule_width_dim/2] #1 
             -| \int_use:N \l_tmpb_int )  ;
    \end { tikzpicture }
    \group_end:
  }
\cs_new_protected:Npn __MyRule_iii:w #1 - #2 \q_stop
  {
    \int_set:Nn \l_tmpa_int { #1 }
    \int_set:Nn \l_tmpb_int { #2 + 1 }
  }
\ExplSyntaxOff
\begin{document}
\renewcommand{\arraystretch}{1.4}
\begin{NiceTabular}{ccccc}
AAA & BBBBBB & CCC & DDDDDDD & EEEE \
\MyRulecolor=red{2-2} \MyRulecolor=blue,width=1pt{3-3} \MyRulewidth=2pt{4-5}
QQQQQ & CCCC & DDDDDDD & JJJJJJJJ & KKK\
\MyRule[color=red,style=dotted,width=1pt]{2-3}
QQQQQ & CCCC & DDDDDDD & JJJJJJJJ & QQQQQ
\end{NiceTabular}
\end{document}

You need several compilations (because nicematrix uses PGF/Tikz nodes).