How align paragraph with labels before resume enumitem list

Question

I have an enumerate list created with enumitem that I interrupt and then resume. Between the last item before the interruption and the first after the resumption, I insert a text paragraph. How can I horizontally align that paragraph so that:

The first line of that paragraph is horizontally aligned with the left ends of the item labels (as indicated on the output shown at the end here); and instead
The entire paragraph's left edge is aligned with the left ends of the item labels.

Here's what I tried:

documentclass[12pt]{article}
usepackage{calc}
usepackage{enumitem}

newlist{myenum}{enumerate}{1}
setlist[myenum,1]{label= upshape(arabic*), ref={arabic*}}

begin{document}

noindent Here is a list.

begin{myenum}
  item
    One
  item
    Two
end{myenum}

hspace{thelabelindent}%
Some other text will go here that may or may not fill out more than a single line of text on the page.

begin{myenum}[resume*]
  item 
    Three
  item
    Four
end{myenum}

end{document}

I believe I want some arithmetic combination of lengths, such as in...

hspace{thelabelwidth-thelabelsep}

...and I would expect to use some command from package calc to do this, but: (a) I don't know how to combine such lengths; and (b) I don't see just what lengths I need to combine.

barbara beeton · Accepted Answer

this seems to do the job:

documentclass[12pt]{article}
usepackage{calc}
usepackage{enumitem}

newlist{myenum}{enumerate}{1}
setlist[myenum,1]{label= upshape(arabic*), ref={arabic*}}

newdimenmidlistindent
settowidth{midlistindent}{(1)kern-labelindentkern-labelsep}
newcommand{midlist}[1]{%
  begingroup
  leftskipmidlistindent
  noindent #1unskippar
  endgroup}

begin{document}

noindent Here is a list.

begin{myenum}
  item
    One
  item
    Two
end{myenum}

midlist{%
Some other text will go here that may or may not fill out more than a single line of text on the page.
}

begin{myenum}[resume*]
  item 
    Three
  item
    Four
end{myenum}

end{document}

pikopiko · Answer

You have the right idea! However, instead of using the calc environment, enumitem can handle it on its own. For reference, here's the dimensions figure in the enumitem package documentation:

It appears you wish to have the left margin set to zero, and the label width equal to the item indent.
This is achieved with the following adjustments to the enumerate environment:
begin{enumerate}[
    align=left, 
    leftmargin=0pt, 
    itemindent=labelwidth, 
    labelsep=0pt
]
end{enumerate}

This looks like so in your document. Is this what you were after?

MWE:
documentclass[12pt]{article}
usepackage{enumitem}

newlist{myenum}{enumerate}{1}
setlist[myenum,1]{label= upshape(arabic*), ref={arabic*},
    align=left, 
    leftmargin=0pt, 
    itemindent=labelwidth, 
    labelsep=0pt}

begin{document}

noindent Here is a list.
    
    begin{myenum}
      item One
      item Two
    end{myenum}
    
    noindent Some other text will go here that may or may not fill out more than a single line of text on the page.
    
    begin{myenum}[resume*]
      item Three
      item Four
    end{myenum}

end{document}

How align paragraph with labels before resume enumitem list

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