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Inconsistent spacing before environments (align, minted, etc) with and without empty lines before

TeX - LaTeX Asked by Walter Schulze on February 7, 2021

Having an empty line before minted and align environments seems to make a big difference in layout. I would prefer to have latex always enforce a consistent layout with only a baselineksip whether I have an empty line or not. Is this possible?

I have achieved consistency for verbatim and itemize, but I am struggling with minted and align environments, see pictures with examples:

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I include here my latex, where I have already attempt to do this and failed:

documentclass[
12pt,%
oneside,%
a4paper%
]{memoir}
setlength{parskip}{baselineskip}%
setlength{parindent}{0pt}%
setlength{partopsep}{-baselineskip}
setlength{topsep}{0pt}

%% Language setup
 usepackage{babel}% Language setup

%% Math setup
 usepackage[fleqn]{amsmath}% Advanced math (before fonts), with fleqn option to align equations to left
 usepackage{amsfonts,amssymb,amsthm}              % extra math fonts
 renewcommand{theequation}{roman{equation}}     % roman numbering for equations in align environment

%% Font setup
 usepackage{lmodern}
 usepackage[T1]{fontenc}
 usepackage{textcomp}% Additional text character
 usepackage{bm}% Bold math symbols (after fonts)
 usepackage{verbatim}

%% Graphics and Color
usepackage{graphicx}% Graphicx
usepackage{color}% Color setup

%% Code Highlighting
usepackage{minted}
usemintedstyle{tango}

%% Drawing
usepackage{tikz}
usetikzlibrary{positioning}

%% Extra Symbols
%mathbin can be used to create other binary operators that are also well layed out, see https://www.overleaf.com/learn/latex/Spacing_in_math_mode

%% Margins
usepackage{geometry}
 geometry{
 a4paper,
 left=25mm,
 right=25mm,
 top=25mm,
 bottom=25mm
 }

%% Spacing

usepackage{enumitem}
setlist{itemsep=.5baselineskip, parsep=0pt, topsep=-.5baselineskip, partopsep=0pt} % remove the extra spaces before and after itemize and set the remaining space between items to be half of the space between paragraphs.

%% etoolbox allows the use of apptocmd and patchcmd below
usepackage{etoolbox}

% Remove parenthesis around Definition, Example, etc's optional title.
% For example, the parenthesis found here:
% Definition 3.2.1 (Regular Expression Tree).
patchcmd{thmhead}{(#3)}{#3}{}{}

% Remove extra lines before and after verbatim
makeatletter
preto{@verbatim}{topsep=0pt partopsep=0pt }
makeatother

%% Hyperlinks
usepackage{hyperref}

title{Consistent Spacing Around Environments}

begin{document}

%% Spacing before and after align environment for equations

% These parameters must be set after
% https://en.wikibooks.org/wiki/LaTeX/Advanced_Mathematics#Adjusting_vertical_white_space_around_displayed_math
setlength{abovedisplayskip}{-baselineskip}
setlength{belowdisplayskip}{0pt}
setlength{abovedisplayshortskip}{-baselineskip}
setlength{belowdisplayshortskip}{0pt}
setlength{mathindent}{0pt}

%% Chapters

chapter{verbatim is consistent}

First verbatim with empty line is consistent with second one:

begin{verbatim}
<html>
  <head>
    <title>My Title</title>
  </head>
  <body>
    <p>First Paragraph</p>
    <p>Second Paragraph</p>
  </body>
</html>
end{verbatim}

Followed by an empty line.

Second verbatim without empty line is consistent with top one:
begin{verbatim}
<html>
  <head>
    <title>My Title</title>
  </head>
  <body>
    <p>First Paragraph</p>
    <p>Second Paragraph</p>
  </body>
</html>
end{verbatim}
Followed by no empty line.

chapter{Minted has inconsistencies}

First minted environment with an empty line (this is what I want for both cases):

begin{minted}{coq}
Inductive regex :=
  | empty_set : regex
  | empty_string : regex
  | symbol : char -> regex
  | concat : regex -> regex -> regex
  | or : regex -> regex -> regex
  .
end{minted}

Followed by an empty line.

Second minted environment without an empty line has excessive space:
begin{minted}{coq}
Inductive regex :=
  | empty_set : regex
  | empty_string : regex
  | symbol : char -> regex
  | concat : regex -> regex -> regex
  | or : regex -> regex -> regex
  .
end{minted}
Followed by no empty line, but again excessive space.

chapter{Align has inconsistencies}

First align environment with empty line (This is what I want for both cases):

begin{alignat*}{3}
e,f & =  
&      &&emptyset && text{ the empty set}; 
&mid && epsilon && text{ the empty string}; 
&mid && a        && text{ a $in$ $Sigma$}; 
&mid && e, f     && text{ the concatenation of } e text{ and } f; 
&mid && e mid f && text{ the union of } e text{ and } f;
end{alignat*}

Another empty line here.

Second align environment without empty line (clearly this is bad, I want it to look like the one above without the user needing the add an empty line):
begin{alignat*}{3}
e,f & =  
&      &&emptyset && text{ the empty set}; 
&mid && epsilon && text{ the empty string}; 
&mid && a        && text{ a $in$ $Sigma$}; 
&mid && e, f     && text{ the concatenation of } e text{ and } f; 
&mid && e mid f && text{ the union of } e text{ and } f;
end{alignat*}
No empty line here either.

chapter{itemize is consistent}

First itemize with empty line

begin{itemize}
    item call
    item return
    item internal
end{itemize}

Followed by empty line.

Second itemize without empty line
begin{itemize}
    item call
    item return
    item internal
end{itemize}
Followed by no empty line.


end{document}
alignline spacingminted

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