%%
%%  Copyright (C) 2020, 2021 by Xiangdong Zeng <xdzeng96@gmail.com>
%%
%%  This work may be distributed and/or modified under the
%%  conditions of the LaTeX Project Public License, either
%%  version 1.3c of this license or (at your option) any later
%%  version. The latest version of this license is in:
%%
%%    http://www.latex-project.org/lppl.txt
%%
%%  and version 1.3 or later is part of all distributions of
%%  LaTeX version 2005/12/01 or later.
%%
%%  This work has the LPPL maintenance status `maintained'.
%%
%%  The Current Maintainer of this work is Xiangdong Zeng.
%%
\documentclass{l3doc}
\usepackage{array,booktabs,emoji,fontspec,geometry,graphicx,longtable,xcolor}

\geometry{left=3cm, right=1.6cm, vmargin=3.2cm}
\setmainfont{NotoSerif}[
  Extension      = .ttf,
  UprightFont    = *-Light,
  BoldFont       = *-Medium,
  ItalicFont     = *-LightItalic,
  BoldItalicFont = *-MediumItalic,
]
\setsansfont{NotoSans}[
  Extension      = .ttf,
  UprightFont    = *-SemiCondensed,
  BoldFont       = *-SemiCondensedBold,
  ItalicFont     = *-SemiCondensedItalic,
  BoldItalicFont = *-SemiCondensedBoldItalic,
]
\setmonofont{NotoSansMono}[
  Ligatures      = CommonOff,
  Extension      = .ttf,
  UprightFont    = *-CondensedLight,
  BoldFont       = *-CondensedMedium,
]
% \setemojifont{Twemoji Mozilla}[BoldFont=*]
\setemojifont{TwemojiMozilla.ttf}[Path=fonts/twemoji-colr/, BoldFont=*]

\newfontface\fontja{Source Han Serif Light}
\newfontface\fontsymbol{Noto Sans Symbols Light}
\newfontface\ttcond{NotoSansMono-ExtraCondensedLight.ttf}[Ligatures=CommonOff]

\makeatletter
\ExplSyntaxOn

\cs_set:Npn \@pnumwidth { 1.8em }

\cs_set_protected:Npn \__codedoc_meta_original:n #1
  {
    {\fontsymbol\symbol{"2329}}
    \kern.2pt
    \group_begin:
      \normalfont \rmfamily \itshape
      \edef \meta@hyphen@restore
        { \hyphenchar \the \font \the \hyphenchar \font }
      \hyphenchar \font \m@ne
      \language \l@nohyphenation
      #1 \/
      \meta@hyphen@restore
    \group_end:
    \kern-.2pt
    {\fontsymbol\symbol{"232A}}
  }

\DeclareRobustCommand{\LaTeX}{
  L\kern-.34em
  \raisebox{.36ex}{\scalebox{0.9}{\textsc{a}}}
  \kern-.12em
  \TeX}

\def\@fnsymbol#1{
  \ensuremath{
    \ifcase #1
      \or \text{\emoji{globe-with-meridians}}
      \or \text{\emoji{email}}
    \fi}}

\bool_new:N \g__emoji_doc_after_group_bool
\bool_new:N \g__emoji_doc_first_group_bool
\int_new:N  \g__emoji_doc_group_count_int
\int_new:N  \g__emoji_doc_subgroup_count_int
\int_new:N  \g__emoji_doc_total_count_int
\str_new:N  \g__emoji_doc_group_str
\str_new:N  \g__emoji_doc_subgroup_str

\cs_set:Npn \__emoji_def:nnnnn
  {
    \int_gincr:N \g__emoji_doc_group_count_int
    \int_gincr:N \g__emoji_doc_subgroup_count_int
    \int_gincr:N \g__emoji_doc_total_count_int
    \char_set_catcode_other:N \^
    \__emoji_def_aux:nnnnn
  }
\cs_set:Npn \__emoji_def_aux:nnnnn #1#2#3#4#5
  {
      \emoji {#2}
    & \ttcond \scriptsize #2
    & \ttcond \scriptsize
      \clist_use:nn {#3} { , ~ }
    & \scriptsize #4
    & \ttcond \scriptsize
      \str_set:Nn \l_tmpa_str {#1}
      \str_replace_all:Nnn \l_tmpa_str { ^ ^ ^ ^ ^ ^ 0 } { , }
      \str_replace_all:Nnn \l_tmpa_str { ^ ^ ^ ^ }       { , }
      \exp_args:Nx \clist_use:nn
        { \str_uppercase:f { \str_tail:N \l_tmpa_str } }
        { ~ }
    & \ttcond \scriptsize E#5
    \char_set_catcode_math_superscript:N \^
    \\
  }

\newcolumntype {C} [1] { > { \centering   \arraybackslash } m {#1} }
\newcolumntype {P} [1] { > { \raggedright \arraybackslash } m {#1} }

\cs_set:Npn \__emoji_group:n #1
  {
    \bool_if:NTF \g__emoji_doc_first_group_bool
      { \bool_set_false:N \g__emoji_doc_first_group_bool }
      { \__emoji_doc_end_group: }
    \str_gset:Nn \g__emoji_doc_group_str {#1}
    \str_gremove_all:Nn \g__emoji_doc_group_str { ~\&~ }
    \exp_args:Nx \subsubsection
      { #1 ~ ( \exp_not:N \ref* { count: emoji@ \g__emoji_doc_group_str } ) }
    \newcounter { emoji@ \g__emoji_doc_group_str }
    \int_gzero:N \g__emoji_doc_group_count_int
    \bool_set_true:N \g__emoji_doc_after_group_bool
  }

\cs_set:Npn \__emoji_subgroup:n #1
  {
    \bool_if:NF \g__emoji_doc_after_group_bool
      { \__emoji_doc_end_longtable: }
    \bool_set_false:N \g__emoji_doc_after_group_bool
    \str_gset:Nn \g__emoji_doc_subgroup_str {#1}
    \str_gremove_all:Nn \g__emoji_doc_subgroup_str { ~\&~ }
    \newcounter { emoji@ \g__emoji_doc_subgroup_str }
    \int_gzero:N \g__emoji_doc_subgroup_count_int
    \__emoji_doc_begin_longtable:x
      { #1 ~ ( \exp_not:N \ref* { count: emoji@ \g__emoji_doc_subgroup_str } ) }
  }

\cs_set:Npn \__emoji_doc_begin_longtable:n #1
  {
    \begin{longtable} { C{1.1cm} P{3.6cm} P{2.4cm} P{3.6cm} C{1.8cm} C{1.2cm} }
        \caption{#1} \\
        \__emoji_doc_longtable_head:
      \endfirsthead
        \__emoji_doc_longtable_head:
      \endhead
        \bottomrule
      \endfoot
  }
\cs_generate_variant:Nn \__emoji_doc_begin_longtable:n { x }

\cs_set:Npn \__emoji_doc_longtable_head:
  {
    \toprule
      \strong{\small Emoji}
    & \strong{\small Fullname}
    & \strong{\small Aliases}
    & \strong{\small Description}
    & \strong{\small Codepoints}
    & \strong{\small Version} \\
    \midrule
  }

\cs_set:Npn \__emoji_doc_end_longtable:
  {
    \end{longtable}
    \int_set:cn
      { c@emoji@ \g__emoji_doc_subgroup_str }
      { \g__emoji_doc_subgroup_count_int - 1 }
    \refstepcounter { emoji@ \g__emoji_doc_subgroup_str }
    \label { count: emoji@ \g__emoji_doc_subgroup_str }
  }

\cs_set:Npn \__emoji_doc_end_group:
  {
    \__emoji_doc_end_longtable:
    \int_set:cn
      { c@emoji@ \g__emoji_doc_group_str }
      { \g__emoji_doc_group_count_int - 1 }
    \refstepcounter { emoji@ \g__emoji_doc_group_str }
    \label { count: emoji@ \g__emoji_doc_group_str }
  }

\cs_new_protected:Npn \EMOJITABLE
  {
    \bool_set_true:N \g__emoji_doc_first_group_bool
    \input { emoji-table.def }
    \__emoji_doc_end_group:
    \newcounter { emoji }
    \int_set:cn { c@emoji } { \g__emoji_doc_total_count_int - 1 }
    \refstepcounter { emoji }
    \label { count: emoji }
    \ExplSyntaxOff
  }

\ExplSyntaxOff
\makeatother

\hypersetup{citecolor=green!75!black}
\linespread{1.2}

\def\LuaLaTeX{Lua\LaTeX}
\def\LuaHBTeX{LuaHB\TeX}

\def\contentsname{\emoji{snowman} Contents}
\def\refname{\emoji{mortar-board} References}

\title{The \pkg{emoji} package \thanks{\url{https://github.com/stone-zeng/latex-emoji}} \\
  Emoji support in (Lua)\LaTeX}
\author{Xiangdong Zeng \thanks{\url{xdzeng96@gmail.com}}}
\date{\emoji{date} 2021/07/17\quad v0.2.2}

\begin{document}

\maketitle

\tableofcontents

\section{\emoji{hamburger} Introduction}

\strong{Emoji} (\emoji{jp}: {\fontja 絵文字}) are pictographs (pictorial symbols) that are
typically presented in a colorful cartoon form and used inline in text. They represent things
such as faces, weather, vehicles and buildings, food and drink, animals and plants, or icons
that represent emotions, feelings, or activities.\textsuperscript{\cite{utr51}}

In 2019, \href{https://github.com/luigiScarso}{Luigi Scarso} has integrated the
\href{https://github.com/harfbuzz/harfbuzz}{HarfBuzz} library into \LuaTeX.%
\footnote{\href{https://github.com/khaledhosny}{Khaled Hosny} has also created a similar project
  \href{https://github.com/khaledhosny/harftex}{HarfTeX}.}
While the original purpose is to optimize the rendering of indic and arabic scripts, emoji are
also supported by this new extended version of \TeX{} at the same time.

The \pkg{emoji} package allows user to typeset emoji in a \LaTeX{} document. It requires
\LuaHBTeX{}, which is the backend of \texttt{lualatex} since \TeX{} Live 2020. In \TeX{} Live
2019, only \texttt{lualatex-dev} can be used to compile.

Emoji has been included in the Unicode Standard since 2009. The \pkg{emoji} package support
the latest version Emoji 13.1 (published on 2020-09-18).%
\footnote{Starting with version 11.0, the repertoire of emoji characters is synchronized with
  the Unicode Standard, and has the same version numbering system.}

\section{\emoji{fire} Basic usage}

\subsection{\emoji{car} Load the package}

The package should be loaded in the usual way:

\begin{verbatim}
  \usepackage{emoji}
\end{verbatim}

\subsection{\emoji{beer} Set emoji fonts}

On Windows, macOS or Linux systems, the \pkg{emoji} package will automatically select available
emoji fonts. If the package can't find any emoji fonts, or if you want to change the default font,
you can use the following command to set emoji font manually.

\begin{function}{\setemojifont}
  \begin{syntax}
    \cs{setemojifont}\marg{font}\oarg{font features}
  \end{syntax}
  This command is similar to \cs{setmainfont} provided by \pkg{fontspec}, but only works for
  emoji. The optional \meta{font features} should be a key-value list, which is described in the
  document of \pkg{fontspec} package in detail.

  You can use this command in the preamble or in the document body. Only emoji afterwards will
  be affected.
\end{function}

Examples:

\begin{verbatim}
  % Font name
  \setemojifont{Apple Color Emoji}

  % File name with explicit path
  \setemojifont{EmojiOneMozilla.ttf}[Path=./fonts/]
\end{verbatim}

\subsection{\emoji{art} Use emoji}

\begin{function}{\emoji}
  \begin{syntax}
    \cs{emoji}\marg{name}
  \end{syntax}
  This is the main command to use emoji. All valid \meta{name} can be found in
  \autoref{subsec:emoji-list} (fullnames and aliases are both OK).
\end{function}

Examples:

\begin{verbatim}
  \emoji{joy}
  \emoji{+1}
  \emoji{family-man-woman-girl-boy}
  \emoji{woman-and-man-holding-hands-light-skin-tone-medium-dark-skin-tone}
\end{verbatim}

\emoji{joy} \emoji{+1} \emoji{family-man-woman-girl-boy}
\emoji{woman-and-man-holding-hands-light-skin-tone-medium-dark-skin-tone}

\section{\emoji{electric-plug} Technical details}

\subsection{\emoji{orange-book} Emoji list}
\label{subsec:emoji-list}

The emoji and their description are from Unicode's
\href{https://www.unicode.org/Public/emoji/latest/emoji-test.txt}{\file{emoji-test.txt}},
while the aliases are from GitHub's
\href{https://github.com/github/gemoji/blob/master/db/emoji.json}{\file{emoji.json}}.

There are totally \ref*{count:emoji} emoji listed here. This should equal to the number of
fully-qualified emoji and components in Unicode standard.

In the following list, emoji is shown with Twemoji font. The fullname is actually a sanitized
version of description, which is from the CLDR short name. The version field \texttt{Ex.x}
corresponds to the Emoji version when the emoji character or emoji sequence was first defined.

\EMOJITABLE

\subsection{\emoji{hammer-and-wrench} Fonts}

At present, \LuaHBTeX{} doesn's support OpenType \texttt{SVG} table, so not all color emoji fonts
can be used normally. Some typical fonts are listed in \autoref{tab:emoji-fonts}.

\begingroup

\def\y{\emoji{white-check-mark}}
\def\x{\emoji{negative-squared-cross-mark}}
\small

\begin{longtable}{cccccc}
    \caption{Typical color emoji fonts}
    \label{tab:emoji-fonts}
  \endfirsthead
    \toprule
      \strong{Font name}
    & \strong{OpenType table(s)}
    & \strong{Bitmap?}
    & \strong{Vector?}
    & \strong{Support?}
    & \strong{Reference} \\
    \midrule
      Apple Color Emoji   & \texttt{sbix}               & \y &    & \y &                     \\
      Segoe UI Emoji      & \texttt{COLR}/\texttt{CPAL} &    & \y & \y &                     \\
      EmojiOne Mozilla    & \texttt{COLR}/\texttt{CPAL} &    & \y & \y & \cite{twemoji-colr} \\
      Twemoji Mozilla     & \texttt{COLR}/\texttt{CPAL} &    & \y & \y & \cite{twemoji-colr} \\
      Noto Color Emoji    & \texttt{CBDT}/\texttt{CBLC} & \y &    & \y & \cite{noto-emoji}   \\
      JoyPixels           & \texttt{CBDT}/\texttt{CBLC} & \y &    & \y & \cite{joypixels}    \\
      EmojiOne            & \texttt{SVG}                &    & \y & \x & \cite{emojione}     \\
      Twitter Color Emoji & \texttt{SVG}                &    & \y & \x & \cite{twemoji}      \\
    \bottomrule
\end{longtable}

\endgroup

This document uses the following fonts:

\begin{itemize}
  \item Noto Serif
  \item Noto Sans
  \item Noto Sans Mono
  \item Noto Sans Symbols
  \item Source Han Serif ({\fontja 源ノ明朝})
  \item Twemoji Mozilla
\end{itemize}

\subsection{\emoji{construction} Known issues}

The \pkg{emoji} package is highly experimental and may have a lot of bugs inevitably. For example:

\begin{itemize}
  \item Spacing around emoji may be abnormal
  \item The emoji may not be copied from PDF
\end{itemize}

If you have any problems when using this package, please create an issue on GitHub or send
an email to the author.

\subsection{\emoji{pencil} Todo list}

The following features may be added in the future:

\begin{itemize}
  \item Allow direct input of emoji
  \item Add options including default skin tones, genders, etc.
  \item Support more fonts
  \item Automatically fallback
\end{itemize}

\begin{thebibliography}{9}
  \def\newblock{\\}
  \small

  \bibitem{utr51}
  Unicode\textregistered{} Technical Standard \#51: Unicode Emoji
  \newblock \url{https://www.unicode.org/reports/tr51/}

  \bibitem{emojipedia}
  \emoji{orange-book} Emojipedia --- \emoji{smiley} Home of Emoji Meanings
  \emoji{information-desk-person}\emoji{ok-hand}\emoji{bamboo}\emoji{heart-eyes}
  \newblock \url{https://emojipedia.org/}

  \bibitem{noto-emoji}
  Noto Color Emoji --- Google Noto Fonts
  \newblock \url{https://www.google.com/get/noto/help/emoji/}

  \bibitem{twemoji}
  Twemoji
  \newblock \url{https://twemoji.twitter.com/}

  \bibitem{twemoji-colr}
  Twemoji font in COLR/CPAL layered format\footnote{Before v0.3, it was based on EmojiOne.}
  \newblock \url{https://github.com/mozilla/twemoji-colr}

  \bibitem{emojione}
  OpenType-SVG font of EmojiOne 2.3
  \newblock \url{https://github.com/adobe-fonts/emojione-color}

  \bibitem{joypixels}
  JoyPixels\texttrademark{} --- Emoji as a Service (formerly EmojiOne)
  \newblock \url{https://www.joypixels.com/}
\end{thebibliography}

\end{document}