Adding nodes through a TikZ style, using double dash lines ``--``

Question

I'm basically asking this question, because the answer there is not working for the case with -- lines.

Say you have a line like so:

\draw (0,0) -- (3,3) node[sloped, midway,above]{Hey!};

Then is it possible to make a style such that the code below produces the same result as above?

\draw[heyEnd](0,0) -- (3,3);

I suspect that it should be very possible, because arrow tips makes this effect.

Full example:

\documentclass[margin=10pt]{standalone}
\usepackage{tikz}
\begin{document}
  \begin{tikzpicture}
    \tikzset{
      heyEnd/.style={
          every edge/.style={
              edge node={node[sloped, midway,above]{Hey!}},
              draw
            }
        }
    }

    %% Intended result:
    % \draw (0,0) -- (3,3) node[sloped, midway,above]{Hey!};

    %% This works:
    % \draw[heyEnd](0,0) edge (3,3);

    % This does not, but I want it to
    \draw[heyEnd](0,0) -- (3,3);
  \end{tikzpicture}
\end{document}

(Possibly) related:

is edge the same as "--" ? Probably you have to do some style settings here as well (when possible). — albert, Jun 17 '18 at 13:39
I don't think that edge is equivalent to --. If it is supposed to be equivalent, then I've discovered a bug, heh :) I don't know when one should be used in favour of the other. I do, however, know that -- is often used and I'd like to know how to do this. Mostly for educational purposes. — Andreas Storvik Strauman, Jun 17 '18 at 13:42
@albert Here is an explanation of edge vs --. They are not supposed to be equivalent :) — Andreas Storvik Strauman, Jun 17 '18 at 13:43
From the TikZ manual: "Like a node the edge generated by the edge operation is not part of the main path, but is added only later." Maybe this is the reason... — Phelype Oleinik, Jun 17 '18 at 13:47
@PhelypeOleinik That might very well be the reason. I'd still want to know how to do it on -- paths using styles :) — Andreas Storvik Strauman, Jun 17 '18 at 13:49

score 8 · Accepted Answer · answered Jun 17 '18 at 14:09

I don't now if that's the answer you are looking for but you can of course achieve the same for -- lines with decorations.

\documentclass[margin=10pt]{standalone}
\usepackage{tikz}
\usetikzlibrary{decorations.markings}
\begin{document}
  \begin{tikzpicture}
    \tikzset{
      heyEnd/.style={
          every edge/.style={
              edge node={node[sloped, midway,above]{Hey!}},
              draw
            }
        },
     heyMark/.style={postaction={decorate,decoration={markings,
     mark=at position 0.5 with {\node[midway,above,sloped]{Hey!}; }}}}  
    }

    %% Intended result:
    % \draw (0,0) -- (3,3) node[sloped, midway,above]{Hey!};

    %% This works:
    \draw[heyEnd](0,0) edge (3,3);

    % This works now
    \draw[heyMark](4,0) -- (7,3);
  \end{tikzpicture}
\end{document}

Adding nodes through a TikZ style, using double dash lines ``--``

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