Draw syntactic movement arrows in examples

movementarrows.tex

% movementarrows.tex - A LaTeX snippet with TikZ generated syntactic
% movement arrows

% Written in 2021 by Enrico Flor mail@enricoflor.net
% To the extent possible under law, the author(s) have dedicated all copyright
% and related and neighboring rights to this software to the public domain
% worldwide. This software is distributed without any warranty.

% You should have received a copy of the CC0 Public Domain Dedication along with
% this software. If not, see <https://creativecommons.org/publicdomain/zero/1.0/>.

\documentclass{article}

\usepackage{tikz}

\usetikzlibrary{positioning,calc}

\newcommand{\anc}[2]{\tikz[remember picture,baseline,inner sep=0]
  \node[anchor=base](#2) {{#1}\hspace{-1.5ex}\phantom{lf}};}

\NewDocumentCommand\moveabove{O{->}mmmO{}O{0cm}}%
{\tikz[remember picture,overlay] \node[above = #4 of #2.center]
 (angle1) {};
 \tikz[remember picture,overlay] \path let \p1 = (#3), \p2 = (angle1) in
 node (angle2) at (\x1,\y2) {};
 \tikz[remember picture,overlay,#1] \path[draw] (#2) -- (angle1.center)
 -- (angle2.center) -- (#3);
  \tikz[remember picture,overlay] \path (angle1) to node [above,xshift=#6]{\scriptsize
    {#5}}  (angle2);
}

\NewDocumentCommand\movebelow{O{->}mmmO{}O{0cm}}%
{\tikz[remember picture,overlay] \node[below = #4 of #2.center] (angle1) {};
 \tikz[remember picture,overlay] \path let \p1 = (#3), \p2 = (angle1) in
 node (angle2) at (\x1,\y2) {};
 \tikz[remember picture,overlay,#1] \path[draw] (#2) -- (angle1.center)
 -- (angle2.center) -- (#3);
 \tikz[remember picture,overlay] \path (angle1) to node [below,xshift=#6]{\scriptsize
   {#5}}  (angle2);
}

\begin{document}

Let's \anc{see}{p1} how this little thing \anc{works}{p2}

\moveabove{p2}{p1}{1.5ex}[label]
\moveabove{p2}{p1}{2em}[label][-4ex] % you can move the label to the right
  % or left

% The default shape is a simple arrow, but the first optional argument
% lets you customize just as much as TikZ lets you:
\movebelow[dashed,ultra thick,<->,color=gray]{p1}{p2}{2em}[a label to
  the right][2em]
  
% It requires a recent version of LaTeX to work as is.

\end{document}