% !TeX root = ./examples/tikzlings.tex
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%
% This is the main part of the TikZlings package
% A package to bring cute little animals and other beings into tikz
% Maintained by samcarter
%
% Project repository and bug tracker:
% https://github.com/samcarter/tikzlings
%
% Released under the LaTeX Project Public License v1.3c or later
% See http://www.latex-project.org/lppl.txt
%
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\ProvidesPackage{tikzlings}[2021/04/16 version v0.6 Collection of packages to draw animals and other beings in TikZ]

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%
% List of all TikZlings
%
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\RequirePackage{tikzlings-list}

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%
% load sub-packages
%
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\RequirePackage{tikz}

% from https://chat.stackexchange.com/transcript/message/56515698#56515698
\ExplSyntaxOn
\cs_new_protected:Npn \tikzlings_load_packages:N #1 {
  \clist_map_inline:Nn #1 {
    \exp_args:Nx \RequirePackage { 
      tikzlings- \__tikzlings_after_slash:w ##1 / / \s_stop 
    }
  }
}
\cs_new:Npn \__tikzlings_after_slash:w #1 / #2 / #3 \s_stop { \tl_trim_spaces:n {#2} }
\cs_new_eq:NN \tikzling@loadpackages \tikzlings_load_packages:N
\ExplSyntaxOff
\tikzling@loadpackages\tikzling@list

\RequirePackage{tikzlings-addons}

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%
% Drawing a random tikzling
%
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\RequirePackage{expl3}
\ExplSyntaxOn
\ifdefined\sys_rand_seed:
  \pgfmathsetseed {\sys_rand_seed:}
\else
  \ifdefined\pdfrandomseed % pdflatex
  \else
      \ifdefined\randomseed 
        \let\pdfrandomseed\randomseed % post TL19 xelatex and lualatex
      \else
          \let\pdfrandomseed\time % pre TL19 xelatex
      \fi
  \fi
  \pgfmathsetseed{\number\pdfrandomseed} 
\fi

% from https://chat.stackexchange.com/transcript/message/56516469#56516469
% To be able to x-expand \iterateTikzlings, it has to be expandable, so no 'protected'.  Also \clist_map_inline:Nn is not expandable, so we have to use \clist_map_function:NN instead.
\cs_new:Npn \tikzlings_iterate:N #1 { 
  \clist_map_function:NN #1 \__tikzlings_braced_items:n 
}
% \__tikzlings_braced_items:n will receive each clist item, then:
\cs_new:Npn \__tikzlings_braced_items:n #1 {
  { % leave an open brace
  % we don't want the x-expansion to expand the tikzling command, so we prevent expansion with \exp_not:c.  The 'c' variant is used so it builds a csname from its argument, before preventing the expansion: and the argument is what's before the '/'
  \exp_not:c { 
    \__tikzlings_before_slash:w #1 / \s_stop 
  }
  } % leave a close brace
}
\cs_new:Npn \__tikzlings_before_slash:w #1 / #2 \s_stop {
  \tl_trim_spaces:n {#1} % make sure there are no spaces around the string
}
\cs_new_eq:NN \tikzling@iteraterandom \tikzlings_iterate:N
\cs_new_eq:NN \ExpArgsNnx \exp_args:Nnx

\ExplSyntaxOff

\ExpArgsNnx\pgfmathdeclarerandomlist{tikzlings}{\tikzling@iteraterandom\tikzling@list}

\newcommand{\tikzling}[1][]{%
  \pgfmathrandomitem{\tikzling@random}{tikzlings}%
  \tikzling@random[#1]
}
