komacv-lco.dtx

% \iffalse meta-comment
%
% Copyright (C) 2017-2018 by Richard Grewe <r-g+tex@posteo.net>
% -------------------------------------------------------
% 
% This file may be distributed and/or modified under the
% conditions of the LaTeX Project Public License, either version 1.2
% 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 1.2 or later is part of all distributions of LaTeX 
% version 1999/12/01 or later.
%
% \fi
%
% \iffalse
%<*driver>
\ProvidesFile{komacv-lco.dtx}
%</driver>
%<package>\NeedsTeXFormat{LaTeX2e}[1999/12/01]
%<package>\ProvidesPackage{komacv-lco}
%<*package>
    [2018/11/02 v0.9b Letter class options usable for komacv]
%</package>
%
%<*driver>
\documentclass{ltxdoc}
\usepackage[columns=2]{idxlayout}
\usepackage{xspace}
\usepackage{enumitem}
\usepackage{keyvaltable}
\usepackage{showexpl}
\lstset{gobble=2,frame=trbl,backgroundcolor=\color{black!5!white},width=0.55\textwidth}
\lstset{basicstyle=\footnotesize\fontfamily{pcr}\selectfont}
\lstset{explpreset={columns=fixed,numbers=none,language={}}}
\lstset{preset={\small\sffamily},overhang=3cm,pos=r,varwidth=false}
\usepackage{pbox}
\usepackage{csquotes}\MakeOuterQuote{"}
\usepackage{filecontents}
\begin{filecontents*}{demo.lco}
\ProvidesFile{demo.lco}
\KOMAoptions{fromemail=true,fromphone=false,frommobilephone=true}

\setkomavar{fromfirstname}{John}
\setkomavar{fromfamilyname}{Doe}
\setkomavar{fromaddressstreet}{Main Street 1}
\setkomavar{fromaddresscity}{12345 Springfield}

\setkomavar{fromphone}[\Telefon~]{555\ 123456}
\setkomavar{frommobilephone}[\Mobilefone~]{555\ 98765}
\setkomavar{fromemail}[\Letter~]{john.doe@example.com}
\setkomavar{place}{Springfield}

\setkomavar{fromgithub}{\httpslink{github.com/JohnDoe}}
\setkomavar{fromlinkedin}{\httpslink{linkedin.com/in/JohnDoe}}
\setkomavar{fromurl}{www.example.com/~Doe}
\end{filecontents*}
\newcommand\NiceDescribeStuff[2]{% #1=margin text, #2=body text
  \medskip\par\noindent\leavevmode%
  \marginpar{\hfill\hbox to 0pt{\hss\pbox[t]{4\marginparwidth}{\ttfamily #1}}%
    \hspace*{-0.85\marginparsep}}% NOTE: the 0.85 fixes an otherwise too close placement
  \ifstrempty{#2}{\ignorespaces}{#2\smallskip\\}}
\newcommand\NiceDescribeEnv[3][]{% #1=index list, #2=envname, #3=parameters
  \NiceDescribeStuff{%
    \textcolor{gray}{\cs{begin}}\string{#2\string}\\
    \textcolor{gray}{\cs{end}}\string{#2\string}}{#3}%
  \ifstrempty{#1}
    {\SpecialEnvIndex{#1}}%
    {\forcsvlist{\SpecialEnvIndex}{#1}}%
  \ignorespaces}
\newcommand\NiceDescribeMacro[2]{% #1=macro, #2=parameters
  \NiceDescribeStuff{\hbox to 0pt{\hss\string#1}}{#2}%
  \SpecialUsageIndex{#1}\ignorespaces}
\newcommand\NiceDescribeConstant[1]{% #1=constant
  \NiceDescribeStuff{#1\quad\kern 0pt\relax}{}}
\newcommand\ThisPackage{\textsf{komacv-lco}\xspace}
\usepackage{hypdoc}
\usepackage[capitalise,noabbrev,nameinlink]{cleveref}
\usepackage{komacv-lco}
\EnableCrossrefs
\CodelineIndex
\RecordChanges
\begin{document}
  \DocInput{komacv-lco.dtx}
  \PrintChanges
  \PrintIndex
\end{document}
%</driver>
% \fi
%
% \CheckSum{0}
%
% \CharacterTable
%  {Upper-case    \A\B\C\D\E\F\G\H\I\J\K\L\M\N\O\P\Q\R\S\T\U\V\W\X\Y\Z
%   Lower-case    \a\b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z
%   Digits        \0\1\2\3\4\5\6\7\8\9
%   Exclamation   \!     Double quote  \"     Hash (number) \#
%   Dollar        \$     Percent       \%     Ampersand     \&
%   Acute accent  \'     Left paren    \(     Right paren   \)
%   Asterisk      \*     Plus          \+     Comma         \,
%   Minus         \-     Point         \.     Solidus       \/
%   Colon         \:     Semicolon     \;     Less than     \<
%   Equals        \=     Greater than  \>     Question mark \?
%   Commercial at \@     Left bracket  \[     Backslash     \\
%   Right bracket \]     Circumflex    \^     Underscore    \_
%   Grave accent  \`     Left brace    \{     Vertical bar  \|
%   Right brace   \}     Tilde         \~}
%
% \changes{v0.9}{2017/08/30}{Initial version}
% \changes{v0.9b}{2018/11/02}{Package author's name change}
%
% \GetFileInfo{komacv-lco.dtx}
%
% \DoNotIndex{\newcommand,\newenvironment,\def,\gdef,\edef}
%
% \title{The \ThisPackage Package\thanks{This document
%   corresponds to \ThisPackage~\fileversion, dated \filedate.
%   The package is available online at
%   \url{http://www.ctan.org/pkg/komacv-rg} and
%   \url{https://github.com/Ri-Ga/komacv-rg}.}}
% \author{Richard Grewe \\ \texttt{r-g+tex@posteo.net}}
%
% \maketitle
%
% \section{Introduction}
% \label{sec:Introduction}
%
% The \ThisPackage package provides means for unifying the input data to a CV
% made with \textsf{komacv} and to a cover letter made with \textsf{scrlttr2}.
% Concretely:
% \begin{itemize}[noitemsep]
% \item When the \ThisPackage package is used within a document of the
%   \textsf{scrlttr2} class (e.g., a cover letter), it defines KOMA variables
%   \textsf{komacv}'s data fields such as |github| and |linkedin|. Values for
%   these variables can therefore be specified in letter-class-option (LCO)
%   files (see the KOMA manual for more on these files).
% \item When the \ThisPackage package is used within CV of the \textsf{komacv}
%   class, it provides a macro for loading LCO files and setting the
%   \textsf{komacv} variables based on these macros.
% \item When the \ThisPackage package is used with neither \textsf{komacv} nor
%   \textsf{scrlttr2} (e.g., a cover sheet), it provides the KOMA variables and
%   macros for accessing them in the document.
% \end{itemize}
%
% \section{Usage}
%
% The following code shows some basic usage of the \ThisPackage package.
% The package provides the |\LoadLetterOption| macro for loading various
% variables. The content of the variables can be displayed, e.g., via the
% |\usekomavar| macro. The \ThisPackage package provides these macros, whose
% interfaces originate from the \textsf{scrlttr2} class, for use with other
% classes than \textsf{scrlttr2} -- particularly including \textsf{komacv}.
%
% \begin{LTXexample}
% \usepackage{komacv-lco}
% \LoadLetterOption{demo}
%
% \begin{document}
% \usekomavar{fromname}\\
% \usekomavar*{fromphone} \usekomavar{fromphone}\\
% \usekomavar*{fromgithub} \usekomavar{fromgithub}
% \end{document}
% \end{LTXexample}
%
% The content of the LCO file, \texttt{demo.lco}, is displayed in
% \cref{fig:lco-example}. This file shows many of the variables defined.
% The remainder of this section provides the complete list of macros and
% variables made available by \ThisPackage.
%
% \begin{figure}
% \lstinputlisting{demo.lco}
% \caption{\texttt{demo.lco}}
% \label{fig:lco-example}
% \end{figure}
%
%
% \subsection{Variables}
%
% The \ThisPackage package provides a set of variables that can be set in LCO
% files and can be used in \textsf{scrlttr2} letters, \textsf{komacv} CVs, and
% other \LaTeX{} documents.
% \Cref{tab:variables} shows the set of variables in alphabetic order.
% \begin{itemize}
% \item Most of the variables correspond to a macro that the \textsf{komacv}
%   class defines and that is displayed in the second column of the
%   \lcnamecref{tab:variables}. The \ThisPackage package ensures that when the
%   value of a variable is set (via |\setkomavar|), the corresponding
%   \textsf{komacv} macro is updated as well.
%   Note that the macros are only defined in documents that use the
%   \textsf{komacv} class. Documents based on another class can access the
%   respective variables via |\usekomavar|.
% \item Many of the variables are also defined by the \textsf{scrlttr2} class.
%   The third column of the \lcnamecref{tab:variables} shows which of the
%   variables these are. The \ThisPackage package makes all of the variables
%   available for use in documents that use the \textsf{scrlttr2} class.
% \item Some of the variables have a symbol assigned to them, as shown in the
%   fourth column of the \lcnamecref{tab:variables}. The symbols are those that
%   the \textsf{komacv} class uses.
% \item Some of the variables have KOMA options of the same name. These
%   variables can be used for disabling the display of the respective variable's
%   content.
% \item Two variables (from \textsf{scrlttr2}) have default values that are
%   based on other, more fine-grained variables (from \textsf{komacv}). These
%   variables are marked in the rightmost column of the
%   \lcnamecref{tab:variables}.
%   Concretely:
%   \begin{itemize}[nosep]
%   \item[$\star$]
%     The `fromaddress' variable by default is set to a two-line
%     combination of the contents of the `fromaddressstreet' and
%     `fromaddresscity' variables.
%   \item[$\star\star$]
%     The `fromname' variable by default is set to the concatenation of the
%     contents of the `fromfirstname' and the `fromfamilyname' variables.
%   \end{itemize}
% \end{itemize}
%
% \begin{table}
%   \NewKeyValTable{variables}{
%     name:   align=l, head=\small\textbf{variable name};
%     macro:  align=l, head=\small\textbf{\textsf{komacv} macro};
%     letter: align=c, head=\small\textbf{\textsf{scrlttr2}};
%     symbol: align=c, head=\small\textbf{symbol};
%     option: align=c, head=\small\textbf{option};
%     default:align=c, head=\small\textbf{default};
%   }
%   \begin{KeyValTable}{variables}
%   \Row{name=fromacadtitle,     macro=\cs{acadtitle},     letter=no,  option=no,  symbol=\usekomavar*{fromacadtitle}}
%   \Row{name=fromaddress,       macro=\cs{address},       letter=yes, option=no,  symbol=\usekomavar*{fromaddress}, default=$\star$}
%   \Row{name=fromaddresscity,   macro=\cs{addresscity},   letter=no,  option=no,  symbol=\usekomavar*{fromaddresscity}}
%   \Row{name=fromaddressstreet, macro=\cs{addressstreet}, letter=no,  option=no,  symbol=\usekomavar*{fromaddressstreet}}
%   \Row{name=fromemail,         macro=\cs{email},         letter=yes, option=yes, symbol=\usekomavar*{fromemail}}
%   \Row{name=fromextrainfo,     macro=\cs{extrainfo},     letter=no,  option=yes, symbol=\usekomavar*{fromextrainfo}}
%   \Row{name=fromfax,           macro=\cs{faxnr},         letter=yes, option=yes, symbol=\usekomavar*{fromfax}}
%   \Row{name=fromfacebook,      macro=\cs{facebook},      letter=no,  option=yes, symbol=\usekomavar*{fromfacebook}}
%   \Row{name=fromfamilyname,    macro=\cs{familyname},    letter=no,  option=no,  symbol=\usekomavar*{fromfamilyname}}
%   \Row{name=fromfirstname,     macro=\cs{firstname},     letter=no,  option=no,  symbol=\usekomavar*{fromfirstname}}
%   \Row{name=fromgithub,        macro=\cs{github},        letter=no,  option=yes, symbol=\usekomavar*{fromgithub}}
%   \Row{name=fromlinkedin,      macro=\cs{linkedin},      letter=no,  option=yes, symbol=\usekomavar*{fromlinkedin}}
%   \Row{name=frommobilephone,   macro=\cs{mobile},        letter=yes, option=yes, symbol=\usekomavar*{frommobilephone}}
%   \Row{name=fromname,                                    letter=yes, option=no,  symbol=\usekomavar*{fromname}, default=$\star\star$}
%   \Row{name=fromphone,         macro=\cs{phonenr},       letter=yes, option=yes, symbol=\usekomavar*{fromphone}}
%   \Row{name=fromtwitter,       macro=\cs{twitter},       letter=no,  option=yes, symbol=\usekomavar*{fromtwitter}}
%   \Row{name=fromurl,           macro=\cs{homepage},      letter=yes, option=yes, symbol=\usekomavar*{fromurl}}
%   \Row{name=location,                                    letter=yes, option=no,  symbol=\usekomavar*{location}}
%   \Row{name=place,                                       letter=yes, option=no,  symbol=\usekomavar*{place}}
%   \end{KeyValTable}
%   \caption{Variables for use in letter options}
%   \label{tab:variables}
% \end{table}
%
%
% \subsection{Macros}
%
% The following macros imitate the behavior of \textsf{scrlttr2}. For a
% documentation of the macros, we refer to the KOMA manual.
% \begin{itemize}
% \item
%   |\newkomavar|\oarg{description}\marg{name}\\
%   |\newkomavar*|\oarg{description}\marg{name}
% \item
%   |\setkomavar|\marg{name}\oarg{description}\marg{content}\\
%   |\setkomavar*|\marg{name}\marg{description}
% \item
%   |\usekomavar|\oarg{command}\marg{name}\\
%   |\usekomavar*|\oarg{command}\marg{name}
% \item
%   |\ifkomavarempty|\marg{name}\marg{true-code}\marg{false-code}\\
%   |\ifkomavarempty*|\marg{name}\marg{true-code}\marg{false-code}
% \item
%   |\ifkomavar|\marg{name}\marg{true-code}\marg{false-code}
% \item
%   |\LoadLetterOption|\marg{name}
%   |\LoadLetterOptions|\marg{names}
% \end{itemize}
% The following macros of the \textsf{komacv} class are provided by
% \ThisPackage.
% \begin{itemize}
% \item |\emaillink|\oarg{link-text}\marg{link}
% \item |\httplink|\oarg{link-text}\marg{link}
% \end{itemize}
% The following additional macros are defined by \ThisPackage.
% \begin{itemize}
% \item |\ifkomavarenabled|\marg{name}\marg{true-code}\marg{false-code}\\
%   This macro executes \meta{true-code} if the variable with name \meta{name}
%   is enabled (through the KOMA option of the same name) and executes
%   \meta{false-code} otherwise.
% \item |\httpslink|\oarg{link-text}\marg{link}\\
%   This macro is analogous to |\httplink|, just for HTTPS links.
% \end{itemize}
%
%
% \section{Limitations}
%
% The current version of \ThisPackage has the following known limitations.
% Some of them might be eliminated in future versions.
%
% \begin{itemize}
% \item Enabled variables that are not already defined by \textsf{scrlttr2} are
%   \emph{not} displayed in the head of the letter.
%   If you want the additional variables to be displayed, you currently have to
%   set the |firsthead| variable manually (see the \textsf{scrlttr2}
%   documentation).
% \item In a document based on the \textsf{komacv} class, KOMA options for
%   enabling/disabling a variable must be set \emph{before} the content of the
%   variable is set. Only then the respective \textsf{komacv} macro is set
%   appropriately (i.e., set empty if the variable is disabled and set to the
%   respective content when enabled). In short, as shown also in
%   \cref{fig:lco-example}: First use |\KOMAoptions| and afterwards use
%   |\setkomavar|.
% \end{itemize}
%
% \clearpage
%
% \StopEventually{}
%\iffalse
%<*package>
%\fi
%
%
% \section{Implementation}
%
% We use the \textsf{etoolbox} package for simplifying the code and use
% the \textsf{scrkbase} package for KOMA options and related macros.
% The \textsf{marvosym} and \textsf{fontawesome} packages provide the symbols
% for some of the variables defined by this package.
%    \begin{macrocode}
\RequirePackage{etoolbox}
\RequirePackage{scrkbase}
\RequirePackage{marvosym,fontawesome}
%    \end{macrocode}
%
%
% \subsection{KOMA Variables Interface}
%
% The ``public'' interface consists of the macros |\newkomavar|, |\setkomavar|,
% and |\usekomavar|, which we define to have the same arguments as the
% counterparts defined by \textsf{scrlttr2}.
%
% \begin{macro}{\newkomavar}
% The |\newkomavar|\oarg{description}\marg{name} macro defines a new KOMA
% variable with name \meta{name} and description \meta{description}.
% If \meta{description} is omitted, no description is set.
% The |\newkomavar*|\oarg{description}\marg{name} macro is defined equivalent to
% the un-starred macro.
%    \begin{macrocode}
\providecommand{\newkomavar}{%
  \@ifstar{\kcvlco@newkomavar}{\kcvlco@newkomavar}}
\newcommand{\kcvlco@newkomavar}[2][\relax]{%
  \ifkomavar{#2}%
    {\kcvlco@error{KOMA variable `#2' already defined}}%
    {\csdef{kcvlco@@var@#2}{\empty}%
     \begingroup\def\@tempa{#1}\def\@tempb{\relax}%
     \ifx\@tempa\@tempb\endgroup\else
     \endgroup\csdef{kcvlco@@desc@#2}{#1}\fi}}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\setkomavar}
% The |\setkomavar|\marg{name}\oarg{description}\marg{content} macro sets the
% content of the variable with name \meta{name} to content \meta{content} and
% sets the description of the variable to \meta{description}.
% The |\setkomavar*|\marg{name}\marg{description} sets only the description of
% the variable with name \meta{name} and sets it to \meta{description}.
%    \begin{macrocode}
\providecommand{\setkomavar}{%
  \@ifstar{\kcvlco@setkomadesc}{\kcvlco@setkomavar}}
\newcommand{\kcvlco@setkomavar}[1]{\kcvlco@onlyifdef{#1}{\@ifnextchar[%
  {\kcvlco@setkomavar@i{#1}}{\kcvlco@setkomavar@i{#1}[\relax]}}}
\long\def\kcvlco@setkomavar@i#1[#2]#3{%
  \csdef{kcvlco@@value@#1}{#3}%
  \csuse{scr@#1@postsetvar}%
  \begingroup\def\@tempa{#2}\def\@tempb{\relax}%
  \ifx\@tempa\@tempb\endgroup\else
  \endgroup\csdef{kcvlco@@desc@#1}{#2}\fi}
\newcommand{\kcvlco@setkomadesc}[2]{%
  \csdef{kcvlco@@desc@#1}{#2}}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\usekomavar}
% The |\usekomavar|\oarg{command}\marg{name} macro expands to the \meta{command}
% applied to the content of the KOMA variable \meta{name}. If omitted,
% \meta{command} is the identity.
% The |\usekomavar*|\oarg{command}\marg{name} macro is analogous to
% |\usekomavar| except that the description of the variable is used rather than
% the content.
%    \begin{macrocode}
\providecommand{\usekomavar}{%
  \@ifstar{\kcvlco@usekomadesc}{\kcvlco@usekomavar}}
\newcommand{\kcvlco@usekomavar}[2][\@firstofone]{%
  \kcvlco@onlyifdef{#2}{#1{\csuse{kcvlco@@value@#2}}}}
\newcommand{\kcvlco@usekomadesc}[2][\@firstofone]{%
  \kcvlco@onlyifdef{#2}{#1{\csuse{kcvlco@@desc@#2}}}}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\ifkomavarempty}
% The |\ifkomavarempty|\marg{name}\marg{true-code}\marg{false-code} expands to
% \meta{true-code} if the content of the KOMA variable \meta{name} is empty, and
% expands to \meta{false-code} otherwise.
% The |\ifkomavarempty*|\marg{name}\marg{true-code}\marg{false-code} is
% analogous to |\ifkomavarempty|, except that the description of the variable is
% checked for emptiness rather than the content.
%    \begin{macrocode}
\providecommand{\ifkomavarempty}{%
  \@ifstar{\kcvlco@ifemptydesc}{\kcvlco@ifemptyvar}}
\newcommand{\kcvlco@ifemptyvar}[1]{\ifcsvoid{kcvlco@@value@#1}}
\newcommand{\kcvlco@ifemptydesc}[1]{\ifcsvoid{kcvlco@@desc@#1}}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\ifkomavar}
% The |\ifkomavar|\marg{name}\marg{true-code}\marg{false-code} macro checks
% whether the KOMA variable \meta{name} is defined and expands to
% \meta{true-code} (positive case) or \meta{false-code} (negative case)
% respectively.
%    \begin{macrocode}
\providecommand{\ifkomavar}[1]{\ifcsdef{kcvlco@@var@#1}}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\ifkomavarenabled}
% The |\ifkomavarenabled|\marg{name}\marg{true-code}\marg{false-code} macro
% checks whether the corresponding KOMA option for \meta{name} exists and is set
% to |false|. In this case, the macro expands to \meta{false-code} and otherwise
% expands to \meta{true-code}.
%    \begin{macrocode}
\providecommand{\ifkomavarenabled}[1]{\csuse{kcvlco@@enab@#1}}
%    \end{macrocode}
% \end{macro}
%
% \subsection{Letter Options Interface}
%
% \begin{macro}{\LoadLetterOption}
% The |\LoadLetterOption|\marg{name} loads options from the file with filename
% \meta{name} (an ``lco''-file, but without the file extension).
% \begin{macro}{\LoadLetterOptions}
% The |\LoadLetterOptions|\marg{names} loads options from the files in the
% comma-separated list \meta{names} of file names (again without ``lco''
% extension).
%    \begin{macrocode}
\providecommand\LoadLetterOption[1]{\input{#1.lco}}
\providecommand\LoadLetterOptions[1]{\forcsvlist{\LoadLetterOption}{#1}}
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
%
% \subsection{URL Formatting}
%
% \begin{macro}{\emaillink}
% The |\emaillink|\oarg{text}\marg{link} macro, analogously to \textsf{komacv}'s
% |\emaillink| macro, provides a means for typesetting a ``mailto'' link.
%    \begin{macrocode}
\providecommand*{\emaillink}[2][]{%
  \ifstrempty{#1}{%
    \href{mailto:#2}{\usefontofkomafont{emaillinkfont}#2}}{%
    \href{mailto:#2}{\usefontofkomafont{emaillinkfont}#1}}}
\IfExistskomafont{emaillinkfont}{}{\newkomafont{emaillinkfont}{}}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\httplink}
% The |\httplink|\oarg{text}\marg{link} macro, analogously to \textsf{komacv}'s
% |\httplink| macro, provides a means for typesetting an HTTP link.
%    \begin{macrocode}
\providecommand*{\httplink}[2][]{%
  \ifstrempty{#1}{%
    \href{http://#2}{\usefontofkomafont{httplinkfont}#2}}{%
    \href{http://#2}{\usefontofkomafont{httplinkfont}#1}}}
\IfExistskomafont{httplinkfont}{}{\newkomafont{httplinkfont}{}}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\httpslink}
% The |\httpslink|\oarg{text}\marg{link} macro, analogously to \textsf{komacv}'s
% |\httplink| macro, provides a means for typesetting an HTTPS link.
%    \begin{macrocode}
\providecommand*{\httpslink}[2][]{%
  \ifstrempty{#1}{%
    \href{https://#2}{\usefontofkomafont{httplinkfont}#2}}{%
    \href{https://#2}{\usefontofkomafont{httplinkfont}#1}}}
%    \end{macrocode}
% \end{macro}
%
%
% \subsection{Registering KOMA Variables with \textsf{komacv} Macros}
%
% \begin{macro}{\kcvlco@newvar}
% The
% |\kcvlco@newvar|\oarg{description}\marg{KOMAvar}\marg{CVmacro}\marg{conditional}
% macro provides the KOMA variable \meta{KOMAvar}. If \meta{conditional} is
% provided, a Boolean |\KOMAoptions| variable named \meta{KOMAvar} is
% registered.
% This Boolean is stored in |if|\meta{conditional} (as registered with
% |\newif|).
% The macro connects \meta{KOMAvar} with the \textsf{komacv} macro
% \meta{CVmacro}. The connection establishes that when \meta{KOMAvar} is
% changed, the \meta{CVmacro} is updated (though \emph{not} vice versa).
%    \begin{macrocode}
\newcommand\kcvlco@newvar[4][\relax]{%
  \ifkomavar{#2}%
    {\begingroup\def\@tempa{#1}\def\@tempb{\relax}%
     \ifx\@tempa\@tempb\endgroup\else
     \endgroup\setkomavar*{#2}{#1}\fi}
    {\newkomavar[{#1}]{#2}}%
  \ifstrempty{#4}%
    {\csdef{kcvlco@@enab@#2}{\ifbool{true}}}%
    {\csdef{kcvlco@@enab@#2}{\ifbool{#4}}\KOMA@ifkey{#2}{#4}}%
%    \end{macrocode}
% We use the \meta{postsetvar} hook of KOMA, which we also implement in our
% |\setkomavar| surrogate.
%    \begin{macrocode}
  \@ifclassloaded{komacv}{%
    \ifstrempty{#4}%
      {\csappto{scr@#2@postsetvar}{\ifkomavarempty{#2}%
          {\let#3=\empty}%
          {\kcvlco@storekomavar{#2}{#3}}}}%
      {\csappto{scr@#2@postsetvar}{\ifkomavarempty{#2}%
          {\let#3=\empty}%
          {\ifbool{#4}{\kcvlco@storekomavar{#2}{#3}}{\let#3=\empty}}}}%
    \csuse{scr@#2@postsetvar}}{}}
%    \end{macrocode}
% \end{macro}
%
%
% \subsection{Internal Helper Macros}
%
% \begin{macro}{\kcvlco@error}
% The |\kcvlco@error|\marg{message} macro displays the given error
% \meta{message}.
%    \begin{macrocode}
\providecommand{\kcvlco@error}[1]{%
  \PackageError{komacv-lco}{#1}{}}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\kcvlco@errundef}
% The |\kcvlco@errundef|\marg{name} macro displays an error message for
% KOMA variable \meta{name} not being defined.
% \meta{message}.
%    \begin{macrocode}
\providecommand{\kcvlco@errundef}[1]{%
  \kcvlco@error{KOMA variable `#1' undefined}}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\kcvlco@onlyifdef}
% The |\kcvlco@onlyifdef|\marg{name}\marg{code} macro displays an error message
% if KOMA variable \meta{name} is undefined and expands to \meta{code}
% otherwise.
% \meta{message}.
%    \begin{macrocode}
\providecommand{\kcvlco@onlyifdef}[2]{%
  \ifkomavar{#1}{#2}{\kcvlco@errundef{#1}}}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\kcvlco@storekomavar}
% The |\kcvlco@storekomavar|\marg{name}\marg{macro} macro stores the content of
% the KOMA variable \meta{name} into the macro \meta{macro}.
%    \begin{macrocode}
\newcommand{\kcvlco@storekomavar}[2]{\letcs#2{kcvlco@@value@#1}}
%    \end{macrocode}
% \end{macro}
%
%
% \subsection{Declaration of Concrete Variables}
%
% \paragraph{Shared variables}
% The following variables are shared by \textsf{scrlttr2} and \textsf{komacv}.
% The conditionals used in the last argument to |\kcvlco@newvar| are taken over
% from \textsf{scrlttr2}.
%    \begin{macrocode}
\kcvlco@newvar[\Telefon]{fromphone}{\phonenr}{@phone}
\kcvlco@newvar[\Mobilefone]{frommobilephone}{\mobile}{@mobilephone}
\kcvlco@newvar[\FAX]{fromfax}{\faxnr}{@fax}
\kcvlco@newvar[\Letter]{fromemail}{\email}{@email}
\kcvlco@newvar{fromurl}{\homepage}{@www}
%    \end{macrocode}
%
% \paragraph{\textsf{scrlttr2} variables}
% The following variables are \textsf{scrlttr2}-only.
%    \begin{macrocode}
\ifkomavar{fromname}{}{\newkomavar{fromname}}
\setkomavar{fromname}{%
  \usekomavar{fromfirstname}~\usekomavar{fromfamilyname}}
\ifkomavar{fromaddress}{}{\newkomavar{fromaddress}}
\setkomavar{fromaddress}{%
  \usekomavar{fromaddressstreet}\\ \usekomavar{fromaddresscity}}
\ifkomavar{place}{}{\newkomavar{place}}
\ifkomavar{location}{}{\newkomavar{location}}
%    \end{macrocode}
%
% \paragraph{\textsf{komacv} variables}
% The following variables are \textsf{komacv}-only.
%    \begin{macrocode}
\kcvlco@newvar{fromfirstname}{\firstname}{}
\kcvlco@newvar{fromfamilyname}{\familyname}{}
\kcvlco@newvar{fromacadtitle}{\acadtitle}{}
\kcvlco@newvar{fromaddressstreet}{\addressstreet}{}
\kcvlco@newvar{fromaddresscity}{\addresscity}{}
\kcvlco@newvar[\faTwitter]{fromtwitter}{\twitter}{kcvlco@@twitter}
\kcvlco@newvar[\faGithub]{fromgithub}{\github}{kcvlco@@github}
\kcvlco@newvar[\faFacebook]{fromfacebook}{\facebook}{kcvlco@@facebook}
\kcvlco@newvar[\faLinkedin]{fromlinkedin}{\linkedin}{kcvlco@@linkedin}
\kcvlco@newvar{fromextrainfo}{\extrainfo}{kcvlco@@extrainfo}
%    \end{macrocode}
%
%\iffalse
%</package>
%\fi
% \Finale
\endinput