\NeedsTeXFormat{LaTeX2e}[1994/12/01] %% \newcommand* etc. 
\ProvidesPackage{texlinks}[2015/07/20 v0.83 TeX-related links (UL)] 
%% copyright (C) 2011 2012 2013 2015 Uwe Lueck, 
%% http://www.contact-ednotes.sty.de.vu 
%% -- author-maintained in the sense of LPPL below.
%%
%% This file can be redistributed and/or modified under 
%% the terms of the LaTeX Project Public License; either 
%% version 1.3c of the License, or any later version.
%% The latest version of this license is in
%%     http://www.latex-project.org/lppl.txt
%% We did our best to help you, but there is NO WARRANTY. 
%%
%% Please report bugs, problems, and suggestions via 
%% 
%%   http://www.contact-ednotes.sty.de.vu 
%%
%% === \cs{newlet}               ===                %% 2013/01/21
%% |\newlet<cmd><cnd>| is a guarded `\let':
\providecommand*{\newlet}[2]{\@ifdefinable#1{\let#1#2}}
%%
%% == Links in General            ==                %% 2012/12/15
%% === Outline                                  ===
%% % Almost                             %% 2011/07/23
%% % all the            %% including https 2011/08/27
%% The link macros of 'texlinks' are based on macros 
%% |\httpref| and |\httpsref|. For use of 'texlinks' with 'blog.sty', 
%% the latter provides definitions of `\httpref' and `\httpsref'
%% suitable for \HTML, where a choice of opening a new 
%% tab or window---or not---is relevant.
%%
%% For use with 'hyperref' (or ...?), 'texlinks' may 
%% provide definitions of `\httpref' and `\httpsref' 
%% based on `\href'. The decision to do so or not may happen at 
%% `\begin{document}'. 'blog.sty' generates \HTML\ without 
%% using the `{document}' environment, so we might assume 
%% that when `\begin{document}' is found, we are running
%% 'hyperref', or just \emph{something} that provides a 
%% useful `\href'. We might then execute a definition of 
%% `\httpref' in terms of `\href'. Well, not sure ...
%% 
%% Moreover, a \acro{PDF} file with links may be \emph{printed}, 
%% and klicking the links on the paper may fail. 
%% \URL s in main text, on the other hand, sometimes are 
%% troublesome. I consider it a good idea to present 
%% links with their \URL\ as the displayed text in \emph{footnotes}
%% (or endnotes). It may even be useful with \HTML\ to present 
%% the \URL s displayed in some 
%% %% 2011/01/27:                               %% rm. 2011/10/20
%% ``appendix."---This idea has been resumed in v0.2 only, |\urlfoot| 
%% (\secref{urlfoot}).                          %% 2012/12/15
%% %
%% % I tend to introduce something for this ... and there might be a 
%% % package option forcing `\httpref' to use this style. 
%% % Well, better \emph{not today} ... [2011/01/24, TODO]
%%
%% === Package Options                          ===
%% \label{sec:opt}                                  %% 2013/01/21
%% Somebody may want to suppress a definition of `\httpref'
%% at `\begin{document}' ... [2011/01/24, TODO]
%% %% 2011/02/10:
%% 
%% v0.3: Package option |[blog]| suppresses \emph{any} 
%% `\AtBeginDocument' actions---fine for use with 'blog.sty'. 
\DeclareOption{blog}{\let\AtBeginDocument\@gobble}
%% This option may be improved, and another option may be 
%% useful for different purposes than running 'blog.sty'.
\ProcessOptions
%%
%% === Obvious Shorthands                       ===
%% |\htm|, |\html|, and |\pdf| for typical filename extensions 
%% save a few tokens in macro definitions (v0.83):
\newcommand*{\htm}{.htm}
\newcommand*{\html}{\htm l}     %% 2012/12/08 below previously
\newcommand*{\pdf}{.pdf}
%% |\DoubleArg{<cmd-maybe-args>}{<arg>}| (v0.83) works like
%%           \[`<cmd-maybe-args>{<arg>}{<arg>}'\] 
%% It replaces `\@double@first@arg' from v0.8;
%% it may also be useful as a user command.
%% It differs from \LaTeX's `\@dblarg' that adds 
%% a missing optional argument:
\newcommand*{\DoubleArg}[2]{#1{#2}{#2}}
%%
%% === Formatting \URL s and File/Package Names ===
%% %% <- was "Fonts for" 2013/02/20
%% \label{sec:fonts}                                %% 2012/12/19
%% %% ** Fonts for \URL s, File Names, and Package Names **
%% %% new 2011/10/19, TODO: `meansltx'? vgl. `makedoc.cfg'
%% This section ``provides" markup for displaying \URL s (|\urlfmt|), 
%% file names (|\filenamefmt|---thinking of single files 
%% that may be found in the internet or on your computer---, 
%% and ``packages" (|\pkgnamefmt|). 
%% For the latter two, in certain files I use shorthands 
%% |\file| and |\pkg|, resp., ... 
%% `\providecommand' will be used so that the user may choose   %% 2012/12/28
%% the style before loading 'texlinks'. 
%% (Once I may provide a variant of `\providecommand'           %% 2012/12/28
%%  that postpones the ``provision" to the ``beginning" of the 
%%  ``document", even with 'blog.sty' TODO)
%% 
%% It is usual to use 
%% the same font as with                                        %% 2012/12/28
%% `\texttt' for formatting \TeX\ code 
%% (``verbatim", `\verb' etc.). It may also be common to use 
%% `\texttt' for file names, perhaps even for \URL s. 
%% Therefore we provide |\urlfmt{<url>}| as follows: 
\providecommand*{\urlfmt}{\texttt}
%% The user may (later) choose a more advanced treatment by 
%% loading \ctanpkgstyref{url} and 
%% \[`\renewcommand{\urlfmt}{\url}'\]
%% 
%% The file name format |\filenamefmt{<file-name>}|
%% may differ from the format for \URL s---if somebody 
%% wants/adjusts it, \emph{here} it is the \emph{same:}
\providecommand*{\filenamefmt}{\texttt}
%% ... 
%% I favor `\code' over `\texttt' as ``logical markup," 
%% inspired by the \xmltagcode{code} element in \HTML, 
%% but it is too difficult to provide this right now here ...
%%
%% (TODO 2012/12/29: This section seems to be relevant for 
%%                   \secref{url-text} only and might move there.)
%% 
%% %% Instead of |\pkgnamefmt{<pack-name>}|, 
%% %% 'blog.sty' had `\pkg{<pack-name>}',      %% was `prg' 2011/10/20
%% %% without a proper implementation. 
%% |\pkgnamefmt{<package-name>}| displays the name of a ``package". 
%% Using `\textsf' for `\pkgnamefmt' 
%% seems to conform to common practice today---implemented here. 
%% The following code may later be suppressed at some package options, 
%% as with the choice for `\httpref':   %% TODO 2011/01/24
% \@ifdefinable\pkgnamefmt {\let\pkgnamefmt\@firstofone}
% \AtBeginDocument         {\let\pkgnamefmt\textsf}
%% <- This was here until v0.7, makes a difference for \acro{PDF}
%% vs.\ 'blog'/\HTML.                       %% / 2012/12/28
%% [Cf.~\secref{opt}!? TODO]---%% 2013/01/21
%% Now we choose the same as with `\urlfmt':
\providecommand*{\pkgnamefmt}{\textsf}
%% Indeed, the same day we are providing `\textsf' in 'blog.sty'.
%% However, the rationale of the earlier solution was 
%% that web pages use sans-serif as the \emph{normal} font ...
%%
%% %% moving \httpsref 2011/08/27:
%% === Providing &\httpref\ and   &\httpsref    ===
%%                             %% rm. \kern-\baselineskip 2011/10/10
%% \[|\httpref{<host-path[#frag]>}{<text>}|\]
%% should display <text> 
%% as a link to `http://<host-path[#frag]>'; 
%% \[|\httpsref{<host-path[#frag]>}{<text>}|\]
%% is the obvious analogue for `https:' \URL s. 
%% In case `\begin{document}' is found with a definition of 
%% `\href' present, we provide definitions of `\httpref'
%% and `\httpsref' in terms of `\href' there:
\AtBeginDocument{%
    \@ifundefined{href}{%
%         \PackageError ... TODO!? 2011/01/24
      }{\newcommand*{\httpref} [1]{\href {http://#1}}%
        \newcommand*{\httpsref}[1]{\href{https://#1}}}}
%%
%% === Variants of &\httpref\ and &\httpsref    ===
%% |\NormalHTTPref| may be used as an alias for `\httpref' 
%% in situations where the latter has been redefined    %% v0.2
%% (as in \secref{urlfoot}):
\AtBeginDocument{\newlet\NormalHTTPref\httpref}  %% TODO: sec:opt
%% |\ithttpref{<url>}{<text>}| displays <text> in italics:
% \newcommand*{\ithttpref}[2]{\NormalHTTPref{#1}{\textit{#2}}}
%% However, I seem never to have used it. And I would now 
%% prefer |\metahttpref| TODO ...
%%
%% ==== Protocol Prefix                   ====      %% 2012/12/15
%% |\httpprefix| is an idea that was missing in 'blog.sty' up to v0.3. 
%% It may be used to determine generally whether a display of an 
%% \URL\ should include `http://'. I choose as default what was default 
%% in 'blog.sty' 
%% (i.e., ``don't include"):                        %% add. 2011/01/27
\newlet\httpprefix\@empty                   %% \newlet 2015/05/25
%% `\let\httpprefix\relax' would be bad for 'blog.sty' 
%% (would display `\relax'), 
%% while it would be somewhat more efficient.%%%---%%%
%%
%% Now you may customize `\httpprefix' by 
%% \[`\renewcommand{\httpprefix}{http://}'\]
%% %% v0.2:
%% ---or by `\let\httpprefix'|\theHTTPprefix|:
\newcommand*{\theHTTPprefix}{http://}
%% With |\urlhttpsref{<url>}|, we \emph{force} displaying \qtd{`https://'}:
\newcommand*{\urlhttpsref}[1]{\httpsref{#1}{\urlfmt{https://#1}}}
%%
%% ==== The \URL\ (or a Part) as the Link Text Phrase ==== %% (...) 2012/12/28
%% \label{sec:url-text}
%% With |\urlhttpref{<url>}|, that \URL\ <url> is displayed:
\newcommand*{\urlhttpref}[1]{%
    \NormalHTTPref{#1}{\urlfmt{\httpprefix#1}}} 
%% %% moved up here 2011/10/20
%% In 'blog.sty' (as of 2010/05/26), there was a command 
%% `\urlref' instead of `\urlhttpref'. It did not provide `\urlfmt'.
%% 
%% |\domainref{<domain>}{<path>}| is similar, but is intended 
%% to show the domain part <domain> of the \URL\ 
%% `<domain>/<path>' only. 
%% This may be useful when the entire \URL\ does not look 
%% nice, while the domain name is a kind of logo, 
%% and when comparing what different web portals have 
%% to say about the same matter, such as the web versions 
%% of newspapers or magazines. So you may compare how
%% %% v0.83 new example, \tugctanorg gone:
%% % \domainref{www.ctan.org}{pkg/morehype} and 
%% % \domainref {\tugctanorg}{pkg/morehype} inform about %% \tugc... 2012/12/29
%% % the 'morehype' bundle (v0.8).
%% \domainref{www.ctan.org}{tex-archive/macros} and
%% \domainref{tug.ctan.org}{tex-archive/macros}
%% display the top-level `macros' directory of the \TeX\ archive.
%% % The command is also used in \secref{wiki-stack}
%% % for `tex.stackexchange.com'. %% why? rm. 2015/05/24 -- see below
%% %% texblog 2012/06/08; v0.8 here
\newcommand*{\domainref}[2]{\httpref{#1/#2}{\urlfmt{#1}}}
%% Note that on some domains 
%% only domain, an article \acro{ID} and maybe the `.html' 
%% suffix and/or a ``category" between domain and \acro{ID}
%% is required for a working \URL, as opposed to an \URL
%% that is displayed in the browser's address line
%% and contains a kind of transcription of the article's title---e.g.,
%% \urlhttpref{tex.stackexchange.com/questions/84878}.
%%
%% v0.83 adds \ |\prefixref{<prefix>}{<suffix>}{<text>}| \
%% just as an alias for `\domainref' because the same function 
%% may be useful in some cases when `<domain>/<path>',
%% for some code strings <prefix> and <suffix>,
%% is the same as `<prefix><suffix>' and `<prefix>'
%% for some <category>,
%% is the same as `<domain>/<category>':
\newlet\prefixref\domainref
%% Then you may compair how 
%% \[\prefixref{www.ctan.org/tex-archive}{macros}\]
%% and \[\prefixref{tug.ctan.org/tex-archive}{macros}\]
%% display the `generic' subdirectory of the `macros' directory.
%%
%% ==== Linking \URL s in Footnotes       ====      %% 2011/08/27
%% \label{sec:urlfoot}
%% |\foothttpurlref{<url>}| just is like
%% `\footnote{\urlhttpref{<url>}}':
\newcommand*{\foothttpurlref}[1]{\footnote{\urlhttpref{#1}}}
%% |\urlfoot{<short>}{<id>}|
%% redefines `\httpref' so that you can use all the shorthand 
%% macros based on `\httpref' to get the according \URL\ 
%% display (as provided by `\urlhttpref')
%% in a footnote without the need to include the 
%% entire \URL\ in your source code. `\urlfoot' is available 
%% with <short> and <id>
%% when a shorthand |\<short>{<id>}{<text>}| has been defined
%% where `\<short>' is the macro name and <id> is the target 
%% identifier (usually part of the \URL\ generated from <id>)
%% according to the syntax declaration of `\<short>'. 
\newcommand*{\urlfoot}[2]{{%
    \let\httpref\foothttpurlref 
    \let\httpprefix\theHTTPprefix   %% TODO customizable!?
    \csname #1\endcsname{#2}{}}}
%% \begin{example}\leavevmode
%% \[`\CtanPkgRef{morehype}{MoreHype}'
%%   \mbox{\quad and\quad } `\ctanpkgref{morehype}'\] 
%% are provided in \secref{sing-pkgs} for linking to
%% `http://ctan.org/pkg/morehype'.
%% \begin{itemize}
%%   \item 
%%     % Try `CtanPkgRef' \emph{here}: 
%%     % \CtanPkgRef{morehype}{MoreHype},\\ 
%%     % for the \emph{footnote} try
%%     % `\urlfoot{CtanPkgRef}{morehype}';%%%
%%     % \urlfoot{CtanPkgRef}{morehype}
%%     \simpleyields{\CtanPkgRef{morehype}{MoreHype}}   %% etc. 2012/12/30
%%   \item 
%%     \simplecodefbox{\urlfoot{CtanPkgRef}{morehype}}
%%     yields          \urlfoot{CtanPkgRef}{morehype}
%%   \item 
%%     % try `ctanpkgref' \emph{here}: \ctanpkgref{morehype},\\ 
%%     \simpleyields{\ctanpkgref{morehype}}
%%   \item 
%%     % for the \emph{footnote} try 
%%     % `\urlfoot{ctanpkgref}{morehype}'.%%%
%%     % \urlfoot{ctanpkgref}{morehype}
%%     \simplecodefbox{\urlfoot{ctanpkgref}{morehype}}
%%     yields          \urlfoot{ctanpkgref}{morehype}
%% \end{itemize}
%% The lonely \qtd{\pkgnamefmt{morehype}} you see there above 
%% demonstrates that it doesn't work with `ctanpkgref' because 
%% `\ctanpkgref' doesn't have separate arguments for 
%% <id> and <text>, it actually doubles <id>. 
%% A local `\let\ctanpkgref\CtanPkgRef' could help, 
%% but right now I prefer waiting for a better idea. 
%% [TODO] %% 2011/01/27
%% \end{example}
%%
%% v0.3: Now that using `\urlfoot' and `ctanpkgref' together 
%% is so clumsy, while I use it quite often,    %% 2011/02/10
%% we get |\urlpkgfoot{<package-id>}|, abbreviating 
%% `\urlfoot{CtanPkgRef}{<package-id>}':
\newcommand* {\urlpkgfoot} {\urlfoot{CtanPkgRef}}
%% ==== \URL\ Bases ====                            %% 2012/03/09
%% \label{sec:bases} 
%% We typically refer to many web pages under a certain domain, 
%% or in certain subdirectories there. Before v0.6, 
%% I made many definitions like 
%% \[`\newcommand*{\myref}[1]{\httpref{<my-base>/#1}}'\]
%% for this purpose.
%% Storing the definition of such a `\myref' uses 8 tokens 
%% %% including parameter ... %% todo done 2012/12/17
%% in addition to those from <my-base>.
%% With 
%% \[`\newcommand*{\myref}{\httpbaseref{<my-base>}}'\] %% } 2012/12/17
%% we need 5                                       %% was 3 2012/12/17
%% tokens instead, using \ |\httpbaseref{<base>}{<rest>}{<text>}| \
%%                                                 %% <- added text 2013/01/21
%% defined as follows:
\newcommand*{\httpbaseref}[2]{\httpref{#1/#2}}
%% Then `\myref{<rest>}{<text>}' will work like          %% 2013/01/21
%% \[`\httpref{<my-base>/<rest>}{<text>}'\]
%% We change many definitions in ensuing sections accordingly---and 
%% with v0.82 we add a shorthand for definitions like the avove one 
%% for `\myref'. \[|\MakeBasedHref{<cmd>}{<base>}|\] may be applied 
%% as \[`\MakeBasedHref{\myref}{<my-base>}'\] above. In the general 
%% situation, `<cmd>{<path>}{<text>}' will work like 
%% \[`\httpref{<base>/<path>}{<text>}'\]            %% own line 2015/03/27
%% v0.83 extends this to `https' 
%% (has been tested in `texblog.fdf' for more than a year):
\newcommand*{\httpsbaseref}[2]{\httpsref{#1/#2}}        %% 2014/03/21
%% provides |\httpsbaseref{<base>}{<rest>}{<text>}|.
\newcommand*{\MakeBasedHref}[3][http]{%                 %% 2014/03/21
    \ifx#2\@undefined \else \ifx#2\relax     %% was \ifx#1 2014/12/23
        \PackageWarning{texlinks}{Redefining \string#2.}%
    \fi                     \fi
    \expandafter\def\expandafter#2\expandafter{%
%% ... or `\DefExpandStart' from \ctanpkgstyref{dowith} TODO ...
        \csname#1baseref\endcsname{#3}}% 
}
%% This also provides an optional argument for choosing `https'
%% instead of `http':
%% \[|\MakeBasedHref[https]{<cmd>}{<base>}|\]
%% Now `\newcommand*{\mysecureref}{\httpsbaseref{<my-secure-base>}}'
%% may be replaced by 
%% \[`\MakeBasedHref{\mysecureref}{<my-base>}'\] --
%% However, `\MakeBasedHref' does not act like `\newcommand'
%% when <cmd> has been defined earlier, it rather resembles 
%% `\DeclareRobustCommand', in that it just \emph{warns} in such a case.
%% I don't actually make <cmd> robust because I guess it is anyway:
%% The reason for allowing redefinitions has been application
%% to cases where the user should be able to customize commands 
%% (\secref{custom-ref})---well, 
%% I could have `\NewBasedHref' and `\RenewBasedHref' some time 
%% TODO\footnote{And for sections \ref{sec:wiki-back} and 
%%               \ref{sec:wikibooks}, an optional argument 
%%               would have been nice.};
%% TODO: `\@onlypreamble'?
%% 
%% The situation is similar with (many) anchors of a (large) web page. 
%% With v0.6, we introduce 
%% \[|\httpancref{<page-url>}{<anchor>}|\]---\emph{perhaps}, 
%% with `\mirrorctanref' (\secref{texcat}) etc.? TODO
% \newcommand*{\httpancref}[2]{\httpref{#1\##2}}
%%
%%
%% == Google                      ==                %% 2012/12/17
%% |\googleref{<keywords>}{<text>}| \ generates a \Wikiref{Google}
%% search page with keywords from <keywords> in which they 
%% are separated by \qtdcode{+}, as in
%% \[`\googleref{tex+friends}{\TeX~\& friends}'\] 
%% which results in (I'm curious ...)
%% \googleref{tex+friends}{\TeX~\& friends:}
\newcommand*{\googlecom}{google.com/}
% \newcommand*{\googleref}[1]{\httpref{\googlecom\#q=#1}}
%% ... correct link has been very different since 2012: %% 2014/05/25
\newcommand*{\googleref}[1]{\httpref{\googlecom/search?q=#1}}
%% |\googlemapsref{<keywords>}{<text>}| \ generates a 
%% \wikiref{Google Maps}{Google map} from the <keywords>. 
%% <keywords> may compose an address for a \TeX\ users' meeting, 
%% so Google may show them their way. 
%% \[<keywords>=\mbox{\qtdcode{munich+offenbachstrasse+21}}\]
%% results in  \googlemapsref{munich+offenbachstrasse+21}
%%                           {where this has been written.} 
\newcommand*{\googlemapsref}[1]{\httpref{maps.\googlecom maps?q=#1}}
%% 
%% == Wikipedia                   ==
%% === Overview    ===
%% \label{sec:wiki-stack}
%% The present section on links to Wikipedia articles 
%% starts with the rather obvious
%% \[|\wikilangref{<language-code>}{<lemma>}{<text>}|\]
%% but then gets somewhat technical. \secref{langcode}
%% may please the user again by 
%% \[|\Wikiref{<lemma>}|\] 
%% where the language version of the Wikipedia is chosen 
%% according to a macro `\langcode' expanding to \qtdcode{en} 
%% by default. On 
%% \domainref{tex.stackexchange.com}{/questions/84878}, 
%% I have posted the following ``minimal working example:"
%% \begin{verbatim}
%%      \documentclass{minimal} 
%%      \usepackage{hyperref,texlinks} 
%%      \begin{document} 
%%          Look up \wikiref{Charlie Bucket}{Wikipedia}
%%              for \Wikiref{Charlie Bucket}. 
%%      \end{document}
%% \end{verbatim}
%% You may find it as `wiki_mwe.tex' with outcome `wiki_mwe.pdf'.
%% See \secref{langcode} for more examples.     %% 2012/12/30
%%
%% Apart from `\langcode', more advanced things are 
%% \emph{disambiguation} (\secref{wiki-back}),
%% ``piped links"        (\secref{wiki-pipe}), and
%% special characters in \URL s (\secref{wiki-urls}).
%%
%% %% 2015/05/19:
%% Starting in spring 2015, the 'morehype' bundle offers 
%% an additional package 'wikimed.sty' that includes 
%% Wikipedias ``sister projects" like Wiktionary and 
%% provides a variant of \wikienref{URL encoding}{\URL\ encoding},
%% converting punctuation and things like umlauts for valid \URL s.
%% 
%% === Backbones   ===
%% \label{sec:wiki-back}
%% As of v0.6, we have a \dqtd{backbone} macro 
%% \[|\wikilangref{<language-code>}{<lemma>}{<text>}|\]
%% for links to Wikipedia. 
%% (It was |\wikiref| before, starting with v0.4---sorry!)
%% <language-code> consists of 
%% two characters like \lq`de'\rq\ for German Wikipedia articles 
%% or \lq`en'\rq\ for English ones. <lemma> is the identifier of 
%% the article, and <text> is displayed as the link:
% \newcommand*{\wikilangref}[2]{\httpref{#1.wikipedia.org/wiki/#2}}
%% <- 2012/03/09 etc. with \secref{bases} ->
\newcommand*{\wikilangref}[1]{\httpbaseref{#1.wikipedia.org/wiki}}
%% There is |\Wikilangref{<language-code>}{<lemma>}| 
%% for the case that <lemma> and <text> are the same. 
%% With v0.7 however, this command becomes more powerful, 
%% see \secref{wiki-pipe}.
% \newcommand*{\Wikilangref}[2]{\wikilangref{#1}{#2}{#2}}
%% `\wikilangref{<lang>}[<lemma>]{<text>}' would be nicer;
%% %% <- shortened 2012/01/06 ->
%% however, the present code is to work with 'blog.sty' 
%% which does not support optional arguments.%%%---
%%
%% Quite often, programs share their names with movies,
%% biological species, etc., then lemma disambiguation is required. 
%% Usually, we don't want to display the disambiguation.
%% \[|\Wikilangdisambref{<language-code>}{<term>}{<tag>}|\] 
%% will link to
%% \[`http://<language-code>.wikipedia.org/wiki/<term>_(<tag>)'\]
\newcommand*{\Wikilangdisambref}[3]{\wikilangref{#1}{#2 (#3)}{#2}}
%% There                    %% was `Their' 2011/07/23
%% was something like a more general variant |\wikidisambref|, 
%% now I doubt its usefulness and \textcolor{blue}{omit} it 
%% in order to see where it occurs (2011/05/13).
%%
%% For \strong{anchors}, \qtd{&#} can be used with 'blog.sty'---and 
%% even with 'hyperref'.
%% \simpleexample{\wikilangref{en}{TeX#History}{history}}
%%
%% === Piped Links ===
%% \label{sec:wiki-pipe}
%% v0.7 emulates Wikipedia's 
%% \wikiref{Help:Links\#Piped_link}{piped links}         %% was "Piped links" 2012/12/01
%% as with Wikipedia source code \[`[[Pipeline|Pipe]]'\]
%% to get a link to article \qtd{\Wikiref{Pipeline}}     %% \Wikiref 2012/12/01
%% with displayed text
%% \qtd{\wikiref{Pipeline}{Pipe}}. The same syntax 
%% (double brackets) is actually supported by 
%% 'blog.sty' with 'markblog.sty',                       %% was `blogexec' 2012/12/06
%% while otherwise only 
%% \[\GenCmdBox+\Wikilangref{<language-code>}{<lemma>|<text>}+\]
%% works---with settings more below something like 
%% \GenCmdBox+\Wikiref{<lemma>|<text>}+---which 
%% admittedly is not much better than the equivalent 
%% \[`\wikiref{<lemma>}{<text>}'\]
%% 
%% Even Wikipedia's feature that empty <text> removes 
%% the disambiguation term as with `[[Pipe (computing)|]]'
%% resulting in \qtd{\wikiref{Pipe (computing)}{Pipe}}
%% is supported.
\newcommand*{\Wikilangref}[2]{% 
    \@wikilpref{#1}#2\BiteSep|\@nnil\BiteSep\@nil{#2}}
%% I have introduced `\BiteSep' and this kind of parsing 
%% in the \ctanpkgdref{bitelist} package. 
\def\@wikilpref#1#2|#3\BiteSep#4\@nil#5{%
    \ifx\@nnil#3\@empty 
        \wikilangref{#1}{#5}{#5}%
    \else 
        \wikilangref{#1}{#2}{%
            \ifx\@three#3\@three
                \wiki@noparen#2\@nil%
            \else
                #3%
            \fi}%
    \fi}
\def\wiki@noparen#1 (#2\@nil{#1}
%% (Removing 'bitelist' considerations 2015/05/22 ...
%% % I have thought about improving 'bitelist.sty', resulting 
%% % in the following code. In the present application, 
%% % I do not consider it superior. It uses
%% % the same number of tokens but new one has additional 
%% % expansion step. The situation is different to the general case 
%% % because doing everything before `\fi' is okay here.
%% % \newcommand*{\Wikilangref}[2]{% 
%% %     \@wikilPref{#1}#2\BiteSep\@secondoftwo 
%% %                     |\BiteSep\@firstoftwo\@nil{#2}} 
%% % \def\@wikilPref#1#2|#3\BiteSep#4#5\@nil#6{%
%% %     #4{\wikilangref{#1}{#6}{#6}}%
%% %       {\wikilangref{#1}{#2}{%
%% %             \ifx\@three#3\@three 
%% %                 \wiki@noparen#2\@nil%
%% %             \else
%% %                 #3%
%% %             \fi}}}
%% 
%% === English and German ===
%% The next macros just save you from typing braces around 
%% the language codes for English and German:
%% |\wikienref{<lemma>}{<text>}| refers to the English Wikipedia, 
%% |\wikideref{<lemma>}{<text>}| refers to the German one. 
\newcommand*{\wikideref}{\wikilangref{de}}
\newcommand*{\wikienref}{\wikilangref{en}}
%% |\Wikideref{<lemma>}| refers to article <lemma> in the German 
%% Wikipedia and displays <lemma> as <text>:
\newcommand*{\Wikideref}{\Wikilangref{de}}
%% |\Wikienref{<lemma>}| is `\Wikideref''s analogue for English:
\newcommand*{\Wikienref}{\Wikilangref{en}}
%% |\Wikidedisambref{<lemma>}{<tag>}| chooses a disambiguation 
%% according to <tag> for the German Wikipedia, 
%% |\Wikiendisambref{<lemma>}{<tag>}| for the English one:
\newcommand*{\Wikidedisambref}{\Wikilangdisambref{de}}
\newcommand*{\Wikiendisambref}{\Wikilangdisambref{en}}
%% 
%% === ``Implicit" Choice of Language ===           %% 2012/01/06
%% \label{sec:langcode}
%% With v0.6, |\wikiref{<lemma>}{<text>}| works like 
%% \[`\wikilangref{<lc>}{<lemma>}{<text>}'\]    %% ref 2012/10/24
%% when |\langcode| expands to <lc> 
%% (the two-letter language code according to \Wikiref{ISO 639-1}). 
%% The default for <lc> is \qtdcode{en} for English. 
%% It can be overridden even before loading 'texlinks' 
%% (e.g., by an earlier `\newcommand\langcode{de}'):
\providecommand*{\langcode}{en}
%% %% mod. 2012/10/24:
%% For the German versions, use \ `\renewcommand{\langcode}{de}'. \
%% The \ctanpkgref{langcode} package provides a command \
%% |\uselangcode{<lc>}| \ that works like 
%% \ `\renewcommand*{\langcode}{<lc>}' \
%% and adjusts a number of other settings. 
\newcommand*{\wikiref}{\wikilangref\langcode}
%% %% adding args 2012/12/17:
%% |\Wikiref{<lemma>}| and |\Wikidisambref{<term>}{<add>}| %% second \ 2012/12/29
%% are the obvious analogues (cf. \secref{wiki-back}):
\newcommand*{\Wikiref}{\Wikilangref\langcode}
\newcommand*{\Wikidisambref}{\Wikilangdisambref\langcode}
%% \begin{simpleexamples}
%%   \simpleexample{\Wikiref{LaTeX}}
%%   \simpleexample{\wikiref{LaTeX}{&\LaTeX}}
%%   \simpleexample{\Wikidisambref{Latex}{disambiguation}}
%% \end{simpleexamples}
%% 
%% === Blanks and Umlauts in \URL s and Anchors === 
%% \label{sec:wiki-urls}
%% %% <- renamed 2011/05/17 reworked:
%% |\underscorechar| seemed to be useful in macro 
%% definitions. The name was inspired by \LaTeX's 
%% `\@backslashchar' and `\@percentchar'. 
%% However, I am now trying what happens without it. 
%% It occurred in `blog.tex' for the documentation of 
%% the 'blog' package, but `\string_' seems to be a good 
%% replacement.
% \newcommand \underscorechar {}
% {\@makeother\_ \gdef\underscorechar{_}}
%% Anyway, in my notes I have a more elegant macro for 
%% providing ``other" versions of special characters. 
%% 
%% Guessing what `\underscorechar' was good for (2011-05-17):
%% Wikipedia lemmas and anchors often or even \emph{typically} 
%% contain \emph{blank spaces}. 
%% The Wikipedia software usually converts them into 
%% underscore characters. Blank spaces in \emph{lemmas} 
%% seem \emph{not} to need treatment here in 'texlinks'. 
%% However, Wikipedia also creates \emph{anchors} from 
%% \emph{section headings}, which typically contain blank spaces. 
%% This has been more difficult ...
%%
%% Likewise with umlauts: text encoding suffices for \emph{lemmas}
%% (my `\urluml' is not needed for this purpose). 
%% But umlauts in \emph{anchors} 
%% generated from \emph{section headings} are different. 
%% While umlauts in \emph{lemmas} are represented by sequences 
%% starting with a \emph{percent} character, the anchors 
%% use a \emph{dot} instead of the percent character. 
%% Therefore now |\ancuml{<char>}| is provided:
\newcommand*{\ancuml}[1]{\csname ancuml:#1\endcsname}
\@namedef{ancuml:a}{.C3.A4}
\@namedef{ancuml:o}{.C3.B6}
\@namedef{ancuml:u}{.C3.BC}
\@namedef{ancuml:s}{.C3.9F}
%% %% comments removed 2012/01/11:
%% % What you read in the rest of the section is 
%% % \textcolor{blue}{wrong}, the commands are 
%% % \textcolor{blue}{dropped} for testing as of 2011/05/13.
%% % |\itwikideref| is an italic variant of `\wikideref':
% \newcommand*{\itwikideref}[2]{\wikideref{#1}{\textit{#2}}}
%% % By analogy to `\Wikideref', 
%% % The following macros save you from typing the underscore 
%% % (didn't spaces suffice sometimes?)   %% TODO 2011/01/24
%% % and the round parantheses. 
%% % Italic variant |\itwikienref| of `\wikienref'
%% % ('blog.sty' had `\emwikienref' instead):
% \newcommand*{\itwikienref}[2]{\wikienref{#1}{\textit{#2}}} 
%% % |\urluml{<ascii-char>}| as of 2010/05/25 
%% % (not sure if it ever worked or was actually needed): 
% \newcommand*{\urluml}[1]{\csname urluml:#1\endcsname}
% \@namedef{urluml:a}{\#C3\#A4}
% \@namedef{urluml:o}{\#C3\#B6}
% \@namedef{urluml:u}{\#C3\#BC}
% \@namedef{urluml:s}{\#C3\#9F}           %% 2010/08/09
%% 
%% == \TeX-related                ==                %% 2010/08/24
%% === \CTAN                      ===
%% \label{sec:ctan}
%% %% new from scratch 2015/05/16f.:
%% ==== Personal motivation                        ====
%% When I created `texlinks.sty' originally, referring to 
%% \CTAN\ material seemed simple to me. Well, what is \CTAN?
%% Please don't ask me, see the \wikiref{CTAN}{Wikipedia article}
%% and/or its major ``home page" \urlhttpref{www.ctan.org}---or 
%% \CTAN\ introducing itself on \urlhttpref{ctan.org/ctan}---or
%% the \ukfaqref{ctan}{\acro{UK FAQ}!}---Well,
%% in order to generate \wikiref{URL}{\URL}s from human-readable
%% or memorizable input and to document my macros that try to 
%% serve this purpose, I must guess what a domain or \CTAN\ has in 
%% mind when they provide \URL s, while they don't seem to tell us
%% what they have in mind and what rules they follow. So I am just 
%% reporting what I observed and what I guess, and I am trying to
%% introduce two technical terms ... \ The ``discovery" section
%% (\secref{ctan-discovery}) may be confusing, then I hope that 
%% the ``summarizing section" (\secref{ctan-tables}) 
%% will help by its tables.---The present \CTAN\ section (\secref{ctan}) 
%% became especially difficult in December 2012 
%% (cf. \ctanannpref{12-12-006718}{\CTAN\ announcement})
%% and January 2013 when some \URL s stopped to work 
%% or changed their behavior---several times very much 
%% within a few days---and I struggled to follow.
%% 
%% ==== \CTAN ology: kinds of \CTAN\ \URL s (archives, bases) ====
%% % \subsubsection{\CTAN ology:\titlefootnote{A moment ago,
%% %                   \wikienref{L. Ron Hubbard}{L.~Ron Hubbard}
%% %                   kindly suggested the section's title to me.}
%% %                   \ \ kinds of \CTAN\ \URL s (archives, bases)}
%% \label{sec:ctan-discovery}
%% \strong{One thing} are \strong{files} that have been \strong{contributed}
%% to the \strong{\CTAN\ archive} so that \strong{users} can download 
%% them in order to run \TeX\ on their computers, especially for new
%% features that have been made available only in recent months.
%% Such files are submitted to the/a \CTAN\ archive, available through 
%% certain \URL s over the internet.
%%
%% It seems that after some years it became difficult to understand 
%% what features have been provided by so many contributors and 
%% how to find them. For a while, the `help' subtree of a \CTAN\ archive
%% tried to help here (especially the \emph{\TeX\ catalogue}) ... 
%% but eventually only experts could understand the abundance. 
%% So a starting page just for providing tools for 
%% \strong{exploring} the \TeX\ archive became useful and was 
%% provided---over certain \URL s. Here I have called pages
%% available by such \URL s as ``\CTAN\ \strong{description}"
%% pages or so---\strong{second thing}.
%%
%% In order to save internet capacity (per time, 
%% and to save users' patience), \strong{\Wikiref{web mirror}}s 
%% of both archive and description pages have been established 
%% and maintained---copies of the central directory structure.
%% 
%% I have seen two kinds of \strong{\URL s} interesting here:
%% \begin{itemize}
%%   \item \strong{domains} ending on `ctan.org'
%%   \item \URL s ending on `/tex-archive'
%% \end{itemize}
%% 
%% \TeX\ \strong{archive} \URL s show (only) a list of top-level 
%% directories `biblio'..., `dviware', `fonts', `graphics', 
%% `help', `indexing', `info', `install', `language'...,
%% `macros', `obsolete', `support', `systems', `tds',
%% `usergrps', and `web'. This is what characterizes \TeX\ 
%% \emph{archives} or their \emph{roots}, as opposed to 
%% \emph{description} pages, by their \strong{content}
%% (as opposed to characterization by the form of \strong{\URL s}).
%% Including deeper subdirectories, the directory structures
%% of all \TeX\ archives are the same (``mirrors"). They 
%% change by new contributions, but within 24 hours, 
%% other \TeX\ archives copy the changes of the first 
%% one.---There are several \strong{designs} of archive root pages, 
%% varying between archive \emph{mirrors.}
%%
%% \CTAN\ \strong{description} pages have \emph{roots} as well, 
%% and 'texlinks' previously has chosen macro names containing 
%% `ctanorgbase' for accessing them, so there is an idea to call those roots 
%% \strong{\CTAN\ bases}. In spring 2015, all bases I know
%% have the same \strong{design}, and they actually \emph{combine}
%% archive and description: an upper section shows the 
%% archive top-level directories, the remaining page offers 
%% the description/exploring tools. To compare bases with archives
%% in terms of top-level subdirectories, I know of \CTAN\ base 
%% subdirectories `pkg', `author', `topic', and `tex-archive'.
%% 
%%
%% ==== Summary tables with macro names            ====
%% \label{sec:ctan-tables}
%% In the following tables, a macro in the right-hand column 
%% is just \emph{one} to access paths under the corresponding
%% \URL\ in the left-hand column, so the list of macros 
%% probably is not complete here, it just is to give an \emph{idea} 
%% for the following sections. The `\nullctan'\codedots\
%% macros keep some `\ctan'\codedots\ control sequences free 
%% so the latter are available as shorthands for accessing the users' 
%% favorite domains.
%%
%% \vskip\medskipamount %%% \noindent
%% The first table is a list of \URL s resolving to 
%% \CTAN\ description bases according to the previous subsection 
%% (\secref{ctan-discovery}) I know of.
%% (It shrinked and changed much after some very recent discoveries of mine.)
%% Sections starting at \secref{sing-pkgs} tell about many more 
%% macros for accessing description pages.          %% 2015/05/20
%%   \MakeOther\|\MakeNormal\&
%% % \noNiceVerb
%% \begin{center}
%% \begin{tabular}{|r|r|}
%%  \hline
%%   \multicolumn{2}{|c|}{\strong{\CTAN\ bases for package descriptions}} \\
%%  \hline \hline
%%   \multicolumn{1}{|c|}{\strong{\URL}} & \multicolumn{1}{c|}{\strong{macro}} \\
%%  \hline \hline
%%   \urlhttpref{www.ctan.org}   & `\wwwctanorgbaseref{<path>}{<text>}' \\
%%  \hline
%%   \urlhttpref{ctan.org}       & `\nullctanorgbaseref{<path>}{<text>}' \\
%%  \hline
%%   \urlhttpref{dante.ctan.org} & \multicolumn{1}{c|}{---}\\
%%  \hline
%% \end{tabular}
%% \end{center}
%%   \MakeActiveLet\|\nvCmdBox\MakeActiveLet\&\CmdSyntaxVerb
%% % \useNiceVerb
%% \strong{Remarks:}\enspace (a)~|www.ctan.org| and |ctan.org| 
%% have the same functionality.
%%
%% (b)~|\nullctanorgbaseref| appears here rather than |\ctanorgbaseref|
%% because the latter is used as an alias for either
%% |\wwwctanorgbaseref| or `\nullctanorgbaseref', by default for 
%% `\ctanorgbaseref', cf. \secref{sing-pkgs}.
%%
%% (c)~|dante.ctan.org| just redirects to |www.ctan.org|.
%% \vskip\medskipamount %%% \pagebreak %%% \noindent
%% The second table is a list of \URL s resolving to 
%% \CTAN\ \TeX\ archives according to the previous subsection 
%% (\secref{ctan-discovery}) I know of.
%% Macros are described from \secref{texarc} onwards.
%%   \MakeOther\|\MakeNormal\&
%% % \noNiceVerb
%% \begin{center}
%% \begin{tabular}{|r|r|}
%%  \hline
%%   \multicolumn{2}{|c|}{\strong{\CTAN\ archives}} \\
%%  \hline \hline
%%   \multicolumn{1}{|c|}{\strong{\URL}}     & \multicolumn{1}{c|}{\strong{macro}} \\
%%  \hline \hline
%%   \urlhttpref{www.ctan.org/tex-archive}   & `\wwwctanref{<path>}{<text>}' \\
%%  \hline
%%   \urlhttpref{ctan.org/tex-archive}       & `\nullctanref{<path>}{<text>}' \\
%%  \hline \hline
%%   \urlhttpref{tug.ctan.org/tex-archive}   & \multicolumn{1}{c|}{---} \\
%%  \hline
%%   \urlhttpref{tug.ctan.org}               & `\tugctanref{<path>}{<text>}' \\
%%  \hline
%%   \urlhttpref{dante.ctan.org/tex-archive} & `\dantectanref{<path>}{<text>}'\\ 
%%  \hline
%%   \urlhttpref{ctan.sciserv.eu}            & `\sciservref{<path>}{<text>}' \\
%%  \hline \hline
%%   \urlhttpref{mirror.ctan.org}            & `\mirrorctanref{<path>}{<text>}'\\
%%  \hline
%%   `<domain>/<path>tex-archive'            & \multicolumn{1}{c|}{TODO} \\
%%  \hline
%%   `<domain>/<path>ctan/'                  & \multicolumn{1}{c|}{TODO} \\
%%  \hline
%%   `<domain>'                              & \multicolumn{1}{c|}{TODO} \\
%%  \hline
%% \end{tabular}
%% \end{center}
%%   \MakeActiveLet\|\nvCmdBox\MakeActiveLet\&\CmdSyntaxVerb
%% % \useNiceVerb
%% \strong{Remarks:}\enspace \ \ (a)~|\nullctanref| 
%% rather than |\ctanref| appears here because the latter 
%% is used as an alias for one of the other `ctanref' commands, 
%% by default for `\mirrorctanref', cf. \secref{texarc}.
%%
%% (b)~|tug.ctan.org/tex-archive|,\quad |tug.ctan.org|, 
%% \[|dante.ctan.org/tex-archive|\mbox{,\quad and\quad} |ctan.sciserv.eu|\]
%% have the same functionality;
%% which includes (i)~that they show the same page of its own 
%% design and     (z)~that this page includes a few lines of links 
%% to the basic functions of `www.ctan.org'. The design is much 
%% less heavy than the design of `www.ctan.org' with respect 
%% to ($\alpha$)~graphics and to ($\beta$)~the number of columns.
%% At its bottom, the page describes itself as ``experimental" 
%% and as dating from February~2015 (observed in May 2015).
%% 
%% (c)~\strong{Examples} for |<domain>/<path>/tex-archive|, %%%\quad 
%% |<domain>/<path>ctan| and |<domain>|
%% (as listed below `mirror.ctan.org')
%% are \strong{\wikienref{web mirror}{mirrors}} of
%% \[|ctan.org/tex-archive|\mbox{\quad or \quad} 
%%   |www.ctan.org/tex-archive|\]
%% and appear as (somewhat random) resolutions of |mirror.ctan.org|. 
%% <path> may be empty. 
%% |tug.ctan.org| and |ctan.sciserv.eu| listed earlier
%% actually are examples of the last entry,
%% and |dante.ctan.org/tex-archive| exemplifies the other
%% lower entry. The file \ctanfileref{CTAN.sites}
%% in the root directory of any \TeX\ archive should
%% contain all the example \URL s to which `mirror.ctan.org'
%% resolves. However, my intention (which failed) for 
%% the final table entries was that they exemplify mirrors
%% with rather \emph{simple} directory designs, 
%% as opposed to the \URL s listed in the upper part
%% of the table.
%% 
%% 
%% ==== Some \CTAN\ Domains                        ====
%% \label{sec:domains}                                  %% 2015/05/22
%% |\ctanorg| saves a few tokens, using |\nullctanorg| for |ctan.org| 
%% (latter new with v0.83, keeping ultimate expansion of `\ctanorg' from prior 
%%  versions). 
\newcommand*{\nullctanorg}{ctan.org}
\newcommand*{\ctanorg}{.\nullctanorg}
%% `\nullctanorg' and |\wwwctanorg| are useful both for 
%% description pages and \TeX\ archives:
\newcommand*{\wwwctanorg}{www\ctanorg}
%% % Instances are |tug.ctan.org|   (|\tugctanorg|),
%% %               |www.ctan.org|   (|\wwwctanorg|):
%% %               |dante.ctan.org| (|\dantectanorg|):
%% % \newcommand*{\tugctanorg}   {tug\ctanorg}
%% % \newcommand*{\wwwctanorg}   {www\ctanorg}
%% % \newcommand*{\dantectanorg} {dante\ctanorg}
%% % \newcommand*{\mirrorctanorg}{mirror\ctanorg}
%% Referring to \strong{``description"} pages 
%% according to \secref{ctan-discovery}
%% (`\httpbaseref' from \secref{bases}):\MDdocnewline
%% |\wwwctanorgbaseref{<path>}{<text>}| \ links to |www.ctan.org|:
\newcommand*{\wwwctanorgbaseref}{\httpbaseref\wwwctanorg}
%% |\nullctanorgbaseref{<path>}{<text>}| is like 
%% the previous command without `www.':
\newcommand*{\nullctanorgbaseref}{\httpbaseref\nullctanorg}
%% |\metactan@ref{<sub>}{<ref-cmd>}| for some ``null" vs. 
%% `www'-commands that are defined in \secref{sing-pkgs}:
\newcommand*{\metactan@ref}[3]{#2{#1/#3}}
%% 
%% ==== Fixed Macros for Paths in Various \TeX\ Archives ==== %% 2015/05/22
%% \label{sec:texarc}                               %% 2013/01/19
%% \paragraph{Shorthands for paths.}
%% |\texarchive| saves a few tokens:                %% 2015/05/21
\newcommand*{\texarchive}{/tex-archive}
%% Typically, \LaTeX\ macro packages in `macros/latex/contrib/'
%% are discussed, so here is |\ltxcontrib| saving both characters
%% and tokens 
%% (no starting slash so it can be used with `\httpbaseref';
%%  likewise no final one---hopefully only used in present demos 
%%  before v0.83):
\newcommand*{\ltxcontrib}{macros/latex/contrib}
%% We now proceed along the second table of \secref{ctan-tables}:
%% \paragraph{Advanced design of directories.}
%% \TeX\ archive directories on |www.ctan.org| 
%% and |ctan.org| show an advanced design,
%% as compared with mirror \TeX\ archives. 
%% They can be accessed by 
%% \begin{itemize}
%%     \item |\wwwctanref{<path>}{<text>}|  and
%%     \item |\nullctanref{<path>}{<text>}| respectively
%% \end{itemize}
%% (<path> without starting slash):
\MakeBasedHref{\wwwctanref} {\wwwctanorg/\texarchive}
\MakeBasedHref{\nullctanref}{\nullctanorg/\texarchive}
%% \begin{simpleexamples}
%%   \simpleexample{\wwwctanref{}{Archive   root}}
%%   \simpleexample{\wwwctanref{macros/generic}{generic macros}}
%%   \simpleexample{\nullctanref{macros/generic}{generic macros}}
%% % \longsimpleexample{\nullctanref{macros/generic}{generic macros}}
%%   \simpleexample{\nullctanref{\nvCSV\ltxcontrib/morehype}{hypertext}}
%% \end{simpleexamples}
%% In the final example, you see that the ``directory" design
%% even includes something like the corrsponding
%% \strong{\ctanpkggenref{morehype}{package description}}---especially
%% the ``\acro{README}" is displayed in a ``frame."
%%
%% \paragraph{Advanced root page design.}
%% Next, there are archive roots showing a special \emph{starting page},
%% while subdirectories show a rather simple design.
%% \begin{itemize}
%%   \item |\tugctanref{<path>}{<text>}|, 
%%   \item |\dantectanref{<path>}{<text>}|, and
%%   \item |\sciservref{<path>}{<text>}|
%% \end{itemize}
%% make <text> a link to a \TeX~Archive directory or file <path> 
%% on the corresponding domain:
\MakeBasedHref{\tugctanref}{tug\ctanorg}
%% (`tug.ctan.org' once behaved like `alan.smcvt.edu',
%%  Jim Hefferon's former \CTAN\ interface.)
\MakeBasedHref{\dantectanref}{dante\ctanorg/\texarchive}
\MakeBasedHref{\sciservref}{dante\ctanorg}
%% Using the \emph{empty} <path> may be most interesting 
%% for that starting page; otherwise they may simply serve as
%% (known) \emph{nearby mirrors}---speed preferred over design.
%% \begin{simpleexamples}
%%   \simpleexample{\tugctanref{}{Archive root}}
%%   \simpleexample{\tugctanref{info}{Info}}
%% \end{simpleexamples}
%% \paragraph{Random mirrors.}
%% For speed, saving energy (i.e., the \emph{world}), 
%% and certain servers from overload,
%% using |mirror.ctan.org| is recommended,
%% which automatically chooses a \CTAN\ \wikienref{web mirror}{\emph{mirror}}.
%% \[|\mirrorctanref{<path>}{<text>}|.\] %% 2011/10/10 :->.2011/10/21: 
%% is provided for this purpose:
\MakeBasedHref{\mirrorctanref}{mirror\ctanorg}
%% Resulting design may be poor ...
%% \begin{simpleexamples}
%% \simpleexample{%
%%      \mirrorctanref{}{Archive root}}
%% \simpleexample{%
%%      \mirrorctanref{help}{Help}}
%% \end{simpleexamples}
%%
%% ==== \cs{ctanref} for Favourite Mirror, Customizing ==== %% fav. 2015/05/21
%% \label{sec:custom-ref}
%% |\ctanref| should work like one out of 
%% \begin{itemize}
%%    \item `\wwwctanref', `\nullctanref',
%%    \item `\tugctanref', `\dantectanref', `\sciservctanref', and
%%    \item `\mirrorctanref',
%% \end{itemize}
%% %%%(as introduced in \secref{texarc}) 
%%    (as listed in the second table of \secref{ctan-tables})
%% depending on which out of 
%% \begin{itemize}
%%    \item |\usewwwctan|,   |\usenullctan|,
%%    \item |\usetugctan|,   |\usedantectan|, |\usesciservctan|, and
%%    \item |\usemirrorctan|,
%% \end{itemize}
%% appeared most recently. 
%% By \strong{default}, `\ctanref' works like `\mirrorctanref'.
%% So in any case its syntax is \[|\ctanref{<path>}{<text>}|.\]
%% The idea is that it is a shorthand to access the user's 
%% favourite \CTAN\ mirror, or just to save the `www' 
%% in `\wwwctanref', for instance. It may also be modified directly 
%% using 
%% \[|\MakeBasedHref{\ctanref}{<ctan-mirror>}|\]
%% where <ctan-mirror> is a \URL\ of a root of 
%% a \CTAN\ mirror (imitate code from \secref{texarc}---TODO:
%%  more \URL s in \secref{domains}?), 
%% or by 
%% \[|\renewcommand{\ctanref}{\<prefix>ctanref}|\]
\newcommand*{\let@ctanref}{\let\ctanref}          %% v0.83 2015/05/22
\newcommand*{\usemirrorctan}{\let@ctanref\mirrorctanref
    %% v0.83 rm. reminiscence of \let\ctanfileref 
}
%% |\usemirrorctan| \emph{sets} the \strong{default}
%% meaning for |\ctanref| as announced
%% (so it uses \urlhttpref{mirror.ctan.org}):
\usemirrorctan
\RequirePackage{domore}
\setdo[2]{\newcommand*#1{\let@ctanref#2}}
%% TODO `\DoDoWithMore'?
\DoWithMore\do{\usewwwctan     \wwwctanref  }
              {\usenullctan    \nullctanref }
              {\usetugctan     \tugctanref  }
              {\usedantectani  \dantectanref}
              {\usesciservctan \sciservref  }\StopDoing
%% v0.83 drops |\myctanref|, while it might be useful for the user's 
%% preferred mirror. However, \secref{texarc} should show how to 
%% set up `\myctanref' then, and
%% \[|\renewcommand*{\ctanref}{\myctanref}|\]
%% could replace the |\usemyctan| I haven't put here.
%% % \begin{singthm}{Remark} (TODO) \ Another implementation 
%% % of adjusting `\ctanref' I consider is 
%% % using some `\ctanurl'\-`prefix' that you can redefine for 
%% % accessing your favourite mirror.
%% % \end{singthm}
%%
%% ==== Opening/Downloading Files from an Archive  ==== %% 2015/05/25
%% %% moved down 2015/05/18
%% You may actually want to \emph{open} a file <file-name> in <path> 
%% of a \TeX\ archive
%% % <file-name> displayed as the link text,          %% 2011/10/21
%% % by                                               %% 2013/01/21
%% by clicking on <file-name> (which is formatted by 
%% |\filenamefmt| from \secref{fonts})---or 
%% to \emph{offer} this opportunity to readers of your document.
%% In this case, the formatting of \CTAN\ pages 
%% (directories) doesn't matter at all, 
%% so a randomly chosen archive mirror should do:
%% |\mirrorctanfileref{<path>}{<file-name>}|
\newcommand*{\CTANfileref}[3]{#1{#2/#3}{\filenamefmt{#3}}}
\newcommand*{\mirrorctanfileref}{\CTANfileref\mirrorctanref}
%% |\ctanfileref{<path>}{<file-name>}| is provided as an alias 
%% or shorthand for `\mirrorctanfileref':
\newlet\ctanfileref\mirrorctanfileref
%% \begingroup\hfuzz=14pt %% TODO
%%  \begin{simpleexamples}
%%   \simpleexample{\ctanfileref{\nvCSV\ltxcontrib/filedate/doc}{filedate.pdf}} 
%%   \simpleexample{\ctanfileref{\nvCSV\ltxcontrib/filedate}{README}} 
%%   \simpleexample{\ctanfileref{\nvCSV\ltxcontrib}{filedate.zip}} 
%%  \end{simpleexamples}
%% \endgroup
%% %% 2013/01/21: rm. \tugctanfileref %%%% 2015/05/21
%% |\mirrorctanfileref| should not be changed,
%% while the user might 
%% \[|\renewcommand*{\ctanfileref}{\CTANfileref<archive-ref>}|\]
%% with <archive-ref> from the previous section or the 
%% second table in \secref{ctan-tables} 
%% (immitate the earlier definition of `\mirrorctanfiler'), 
%% or s(h)e might 
%% \[|\newcommand*{\myctanfileref}{\CTANfileref<archive-ref>}|\]
%% and (temporarily) 
%% \[|\renewcommand*{\ctanfileref}{\myctanfileref}|\] 
%% (|\filectanref| that I earlier offered for customizing 
%%  is dropped with v0.83.)
%%
%% It may be psychologically useful to have an \emph{opposite} 
%% to `\ctanfileref'                     %% 2015/05/23: filectan -> ctanfile
%% that can easily be recognized as such, 
%% while `\ctanref' may be unclear. I offer 
%% |\dirctanref{<path>}{<text>}| ... 
%% %. It may be an alias  %% was \dirfile... 2015/05/21
%% %for `\ctanref', even respecting the `\use'\codedots\ commands 
%% %from above. Another proposal above is dangerous with the present idea:
%% as a kind of alias for `\ctanref'---you might change that 
%% by `\renewcommand':
\newcommand*{\dirctanref}{\ctanref}
%% \strong{Note:}\enspace Links for opening \CTAN\ files
%% with a different link text than the filename
%% can be generated by `ctanref' commands discribed earlier.
%%
%% ==== The \TeX\ Catalogue OnLine                 ====
%% \label{sec:texcat}                               %% 2012/12/18
%% % We are not providing access to everything in the 
%% % \catalogueref{}{\TeX~catalogue}. 
%% Before v0.8, only 
%% J\"urgen Fenn's Topical Index of the Catalogue 
%% was supported. v0.8 adds package descriptions displayed 
%% by the Catalogue. The following shorthand
%% |\catalogueref{<path[#frag]>}{<text>}| is an auxiliary for 
%% both of them (and other <path>s the user might want). 
%% With empty <path>, 
%% it generates an \URL\ of a \catalogueref{}{root} 
%% in a \CTAN\ mirror  %% shorthand 2012/12/17
%% of \meta{The \TeX~Catalogue OnLine}:
\newcommand*{\catalogueref}[1]{\mirrorctanref{help/Catalogue/#1}}
%% The user may modify this by 
%% \begin{center}
%%   `\renewcommand*{\catalogueref}[1]{\myctanref{help/Catalogue/#1}}'
%% \end{center}
%% or by
%% \begin{center}
%%   `\MakeBasedHref{\catalogueref}{texcatalogue\ctanorg}'
%% \end{center}
%% ---cf. \urlhttpref{texcatalogue\ctanorg}.
%%
%% Some mirrors seem to display the Catalogue's root directory 
%% only this way, while others display the ``Welcome" page. 
%% |\cataloguestartref{<text>}| accesses the 
%% \cataloguestartref{\strong{Welcome} (\strong{start})} page surely:
\newcommand*{\cataloguestartref}{\catalogueref{index\html}}
%% |\bytopicref{<anchor>}{<text>}| 
%% \                                                %% 2011/10/21
%% makes <text> a link to <anchor> of 
%% \strong{J\"urgen Fenn's Topical Index}           %% 2012/12/18
%% of the \TeX\ Catalogue. You find the <anchor> 
%% by clicking at the respective \acro{TOC} entry on top of the page 
%% and then read the \URL\ from the browser's navigation display.
\newcommand*{\bytopicref}[1]{\catalogueref{bytopic\html\##1}}
%% \simpleexample{\bytopicref{html}{&\TeX~to HTML}}
%% \par %% recplaces \[\] 2015/05/20
%% |\catpkgref{<pkg-name>}| makes <pkg-name>
%% a link to the description of the \strong{package} <pkg-name> 
%% in \meta{The \TeX~Catalogue Online}.
%% \[|\CatPkgRef{<name>}{<Name>}|\]
%% is a variant for the cases where authors have a special idea
%% <Name> using some capital letters when they describe their packages
%% (\acro{ASCII} %%% ASCII                   %% 2012/12/14
%% versions of ``logos" such as `BibTeX')    %% was Logos 2012/10/24
%% while the identifier <name> doesn't allow capital letters.
%% %% 2011/01/24:
%% Also, <Name> may be a package from a \emph{bundle} <name> 
%% where <name> has a description page while <Name> 
%% doesn't have its \emph{own} description page~...
%% \simpleexample{\CatPkgRef{morehype}{texlinks}}
\newcommand*{\catpkgref}{\DoubleArg\CatPkgRef}
%\newcommand*{\CatPkgRef}[1]{%
%   \cat@ctan@pkg@ref\catalogueref{entries/#1\html}}
%% <- v0.83 2015/05/20 ->
 \newcommand*{\CatPkgRef}{\cat@ctan@pkg@ref\catpkggenref}
%% v0.83 introduces |\catpkggenref{<pkg-name>}{<text>}|
%% where formatting <text> is up to the user
%% (or not special formatting required):
\newcommand*{\catpkggenref}[1]{\catalogueref{entries/#1\html}}
%% |\cat@ctan@pkg@ref<cmd>{<path>}{<text>}| %% 2012/12/19, rm. frag 2015/05/26
%% \ ensures that <Name> is typeset as the argument of 
%% `\pkgnamefmt' (\secref{fonts}). 
%% It is used in \secref{sing-pkgs} again: 
\newcommand*{\cat@ctan@pkg@ref}[3]{#1{#2}{\pkgnamefmt{#3}}}
%% \simpleexample{\catpkgref{morehype}}
%% % \begin{example}
%%   % \makeatletter \def\ex@mple{\catpkgref{morehype}}%
%%   % \fbox{\strut\expandafter\code\expandafter{\expandafter&\ex@mple}}%
%%   % %% <- bad spaces
%%   % \hskip\labelsep for\hskip\labelsep
%%   % \fbox{\strut\ex@mple}
%%   %      |\catpkgref{morehype}| \ for \ 
%%   % \fbox{\catpkgref{morehype}}
%% % \end{example}
%%
%% ==== Single Packages without The \TeX~Catalogue ====
%% \label{sec:sing-pkgs}                            %% 2012/12/19
%% v0.83 introduces a way to refer to a package description without
%% telling a package's name. |\wwwctanpkggenref{<id>}{<text>}|
%% does not coerce <text> into a special format: 
\newcommand*{\metactan@pkgref}{\metactan@ref{pkg}}
\newcommand*{\wwwctanpkggenref}{\metactan@pkgref\wwwctanorgbaseref}
%% \longsimpleexample
%%      {\wwwctanpkggenref{morehype}{an awesome bundle}}
%% |\nullctanpkggenref{<id>}{<text>}| similarly without `www.':
\newcommand*{\nullctanpkggenref}{\metactan@pkgref\nullctanorgbaseref}
%% |\wwwctanpkgref{<pkg-name>}| makes <pkg-name>    %% 2015/05/26
%% a link to a package info page for the package <pkg-name>
%% on `www.ctan.org'. <pkg-name> is displayed and formatted
%% by `\pkgnamefmt{<pkg-name>}'. |\WwwCtanPkgRef{<name>}{<Name>}|
%% is a variant of `\wwwctanpkgref' relating to the latter 
%% as `\CatPkgRef' relates to `\catpkgref' (\secref{texcat}):
\newcommand*{\wwwctanpkgref}{\DoubleArg\wwwCtanPkgRef}
\newcommand*{\WwwCtanPkgRef}{\cat@ctan@pkg@ref\wwwctanpkggenref}
% %% Using `\cat@ctan@pkg@ref' from \secref{texcat}:
% \newcommand*{\Ct@nPkgRef}[2]{\cat@ctan@pkg@ref#1{pkg/#2}}
%% |\wwwctanpkgstyref{<name>}|                      %% 2012/11/27
%% adds \qtdcode{.sty} to the package name:
\newcommand*{\wwwctanpkgstyref}[1]{\wwwCtanPkgRef{#1}{#1.sty}}
%% Likewise |\nullctanpkgstyref{<name>}| etc.:
\newcommand*{\nullctanpkgstyref}[1]{\nullCtanPkgRef{#1}{#1.sty}}
\newcommand*{\nullctanpkgref}{\DoubleArg\nullCtanPkgRef}
\newcommand*{\NullCtanPkgRef}{\cat@ctan@pkg@ref\nullctanpkggenref}
%% Command names \ |\ctanpkgstyref|, \ |\ctanpkgref|, \ |\CtanPkgRef|, \
%% and \ |\ctanpkggenref| \ interrelate analogously. 
%% I expect these ones are mainly used. 
%% Their exact behavior can be chosen from the `\nullctan'\codedots, 
%% `\wwwctan'\codedots\ things, they even can use the \TeX\ catalogue:
\newcommand*{\ctanpkgstyref}[1]{\CtanPkgRef{#1}{#1.sty}}
\newcommand*{\ctanpkgref}{\DoubleArg\CtanPkgRef}
\newcommand*{\CtanPkgRef}{\cat@ctan@pkg@ref\ctanpkggenref}
\newcommand*{\ctanpkggenref}{\metactan@pkgref\ctanorgbaseref}
%% v0.83 abolishes `tugctanorgbaseref' as 
%% \urlhttpref{tug.ctan.org} no longer has a 
%% `pkg' top-level subdirectory:
% \newcommand*{\useTUGpkgpages}{\let\CtanPkgRef\TugCtanPkgRef}
%% After |\useWWWpkgpages|,
%% the package descriptions from `www.ctan.org' are used:
\newcommand*{\let@ctanobref}{\let\ctanorgbaseref}
\newcommand*{\useWWWpkgpages}{\let@ctanobref\wwwctanorgbaseref}
%% After |\useOpkgpages|, `\CtanPkgRef' and `\ctanpkgref' 
%% use the package descriptions from `ctan.org'. This command
%% and the previous |\useOpkgpages| also decide whether 
%% author (\secref{pkg-au}), topic, and search pages 
%% (\secref{pkg-search}) have `www.' in their \URL\ or not:
\newcommand*{\useOpkgpages}{\let@ctanobref\nullctanorgbaseref}
%% And the latter is the \strong{default:}
\useOpkgpages
%% After |\useCATpkgpages|, `\CtanPkgRef' and `\ctanpkgref'
%% use the \TeX~Catalogue to display package informations. 
%% The content should be much the same as with
%% [`www.']`ctan.org', the same database is used, 
%% it is the design that differs:
\newcommand*{\useCATpkgpages}{\let\CtanPkgRef\CatPkgRef}
%% Finally, we provide experimental 
%% \[|\AllPkgRefs{<name>}{<Name>}| \mbox{\quad and\quad} 
%%   |\allpkgrefs{<name>}|\]
%% offering choice between the two interfaces for each package. 
%% \qtdcode{c} will stand for The \TeX~Catalogue and
%% \qtdcode{w} for `www.ctan.org'. After |\useALLpkgpages|, 
%% this is what `\CtanPkgRef' and `\ctanpkgref' offer:
\newcommand*{\AllPkgRefs}[2]{%
    \pkgnamefmt{#2}\,[\CatPkgRef{#1}{c}\textbar
    %                 \TugCtanPkgRef{#1}{t}\textbar %% rm. v0.83
                      \WwwCtanPkgRef{#1}{w}]}
\newcommand*{\allpkgrefs}{\DoubleArg\AllPkgRefs}
\newcommand*{\useALLpkgpages}{\let\CtanPkgRef\AllPkgRefs}
%% \simpleexample{\allpkgrefs{morehype}}
%% (With 'blog.sty', this requires some `\def\textbar{|}' TODO.)
%%
%% ==== Package Author Pages                       ====
%% \label{sec:pkg-au}
%% |\wwwctanpkgauref{<id>}{<description>}| creates a link
%% to the list of packages somebody described by <description> 
%% maintains:
\newcommand*{\metactan@auref}{\metactan@ref{author}}
\newcommand*{\wwwctanpkgauref}{\metactan@auref\wwwctanorgbaseref}
%% \simpleexample{\wwwctanpkgauref{lueck}{mine}}
%% |\nullctanpkgauref{<id>}{<description>}| removes `www.':
\newcommand*{\nullctanpkgauref}{\metactan@auref\nullctanorgbaseref}
%% |\ctanpkgauref{<id>}{<description>}| chooses from the former 
%% possibilities according to the `\use'\codedots\ commands 
%% in the previous \secref{sing-pkgs}:
\newcommand*{\ctanpkgauref}{\metactan@auref\ctanorgbaseref}
%%
%% ==== Other Ways to Search for Packages          ====
%% \label{sec:pkg-search}                             %% 2012/12/29
%% |\wwwctanpkgtopicref{<topic-id>}{<text>}| accesses a list of 
%% packages belonging to the ``topic" with identifier <topic-id>. 
\newcommand*{\metactan@topicref}{\metactan@ref{topic}}
\newcommand*{\wwwctanpkgtopicref}{%
    \metactan@topicref\wwwctanorgbaseref}
%% \longsimpleexample{\wwwctanpkgtopicref{cvt-html}{make HTML}}
%% |\nullctanpkgtopicref{<topic-id>}{<text>}| without `www.':
\newcommand*{\nullctanpkgtopicref}{%
    \metactan@topicref\nullctanorgbaseref}
%% |\nullctanpkgsearch{<text>}| \ and \ |\wwwctanpkgsearch{<text>}| \
%% create links to a page for searching packages 
%% with several options for search criteria:
\newcommand*{\metactan@searchref}[1]{#1{search}}
\newcommand*{\nullctanpkgsearchref}{%
    \metactan@searchref\nullctanorgbaseref}
%% \simpleexample{\ctanpkgsearchref{CTAN~search}}
\newcommand*{\wwwctanpkgsearchref}{%
    \metactan@searchref\wwwctanorgbaseref}
%% |\ctanpkgtopicref| and |\ctanpkgsearchref| choose 
%% according to the `\use'\codedots\ commands in \secref{sing-pkgs}:
\newcommand*{\ctanpkgtopicref}{\metactan@topicref\ctanorgbaseref}
\newcommand*{\ctanpkgsearchref}{\metactan@searchref\ctanorgbaseref}
%% The \TeX\ Catalogue OnLine has offered searching as well, 
%% yet today this search page is just the same as the one you 
%% get by \wwwctanpkgsearchref.
%%
%%
%% === Mailing Lists              ===
%% \label{sec:mail}
%% This section mainly provides tools for referring %% 2015/05/28
%% to pages of or postings to the \CTAN\ announcments 
%% (\secref{ctan-ann}) and texhax (\secref{texhax}) mailing lists.
%% v0.7 relies on package \ctanpkgref{langcode} for 
%% |\enmonthname{<month-number>}| and |\demonthname{<month-number>}|, 
%% for tricks with language codes extending those in 
%% \secref{langcode}:
\RequirePackage{langcode}
%% The next definitions are backbones for generating links to 
%% web pages about \TeX\ mailing lists. 
%% |\TL@piper@parse<year>-<month-number>-<id>| will be used
%% for referring to single postings:
\def\TL@piper@parse#1-#2-#3/{#1-\enmonthname{#2}/#3}
%% \[|\texlistyearmonthref<list-ref>{<2-digits>-<month-no>}|\]
%% will generate \ |<list-ref>{<path>}| \ for linking to the list of postings 
%% of the <month-no>th month in the year 20<2-digits>:
\newcommand*{\texlistyearmonthref}[2]{\texlist@yearmonthref#1#2\@nil}
\def\texlist@yearmonthref#1#2-#3\@nil{#1{20#2-\enmonthname{#3}}}
%% \qtd{<path>} will be \qtdcode{20<2-digits>-<month>}, 
%% and <month> will be the \emph{English} name of the 
%% <month-no>th month of the year.
%% 
%% \[|\texlanglistmonthref<month-cmd><list-ref>{<2-digits>-<month-no>}|\]
%% will generate \ |<list-ref>{<path>}{<month>}| \ 
%% where <month> is determined from <month-no> by <month-cmd>: 
\newcommand*{\texlanglistmonthref}[3]{\texlanglistm@nthref#1#2#3\@nil}
\def\texlanglistm@nthref#1#2#3-#4\@nil{%
    #2{20#3-\enmonthname{#4}}{#1{#4}}}
%% |\detexlistmonthref<list-ref>{<2-digits>-<month-no>}| \
%% now could be used for `<list-ref>{<path>}{<month>}' 
%% \emph{German} <month> ...
\newcommand*{\detexlistmonthref}{\texlanglistmonthref\demonthname}
%% ... as could be \ |\entexlistmonthref<list-ref>{<2-digits>-<month-no>}| \
%% for \emph{English} <month> ...
\newcommand*{\entexlistmonthref}{\texlanglistmonthref\enmonthname}
%% With proper use of \ctanpkgref{langcode} however, 
%% \[|\texlistmonthref<list-ref>{<2-digits>-<month-no>}|\]
%% \emph{automatically} chooses between English and German <month> 
%% (according to intention ...):
\newcommand*{\texlistmonthref}{\texlanglistmonthref\monthname}
%%
%% === \CTAN\ Announcements       ===               %% 2011/06/27
%% \label{sec:ctan-ann}                             %% 2015/05/28
%% |\ctanannref{<id>}{<text>}| makes <text> a link 
%% to the DANTE web page displaying a \CTAN\ 
%% announcement. You find <id> by searching 
%% \[\texttt{https://lists.dante.de/pipermail/ctan-ann/}\]
%% and then reading the \URL.
%% <id> is composed as 
%% \[`<year>-<month>/<6-digits>.html'\]%%%, \[\] 2012/10/24
%% %% 2012/10/24:
%% where <year> consists of 4 digits and <month> is an \emph{English} 
%% month name:
\newcommand*{\ctanannref}[1]{%
    \httpsref{lists.dante.de/pipermail/ctan-ann/#1}}
%% |\ctanannpref{<id-code>}{<text>}| is a variant 
%% of `\ctanannref' where in place of <id> 
%% you only type the third and fourth digit of the 
%% year (<2-digits>), then a \qtdcode{-}, then the (arabic) 
%% number <month-no> of the month (cf. \secref{mail} so far), 
%% then another \qtdcode{-}, 
%% and then the actual internal identifier <running-no>
%% (a number of six digits preceding \qtdcode{.html} of the \URL). 
%% I.e., \qtd{<id-code>} is \qtdcode{<2-digits>-<month-no>-<running-no>}.
\newcommand*{\ctanannpref}[1]{%
    \ctanannref{20\TL@piper@parse#1/\html}}         %% `20' 2012/12/08
%% \[|\ctanannyearmonthref{<2-digits>-<month-no>}|\] generates 
%% `\ctanannref{<path>}' from \qtdcode{<2-digits>-<month-no>}---<path> 
%% as in \secref{mail} ...
\newcommand*{\ctanannyearmonthref}{\texlistyearmonthref\ctanannref}
%% \[|\ctanannmonthref{<2-digits>-<month-no>}|\] generates 
%% `\ctanannref{<path>}{<month>}' where <month> obeys `\langcode' ...
%% % from \qtdcode{<2-digits>-<month-no>}
\newcommand*{\ctanannmonthref}{\texlistmonthref\ctanannref}
%%
%% === \code{\dots stack\dots} Forums ===           %% 2012/12/17/18
%% |\stackexref{<id-no>}{<text>}| \ shows exchange about 
%% Question No.~<id-no> on \urlhttpref{tex.stackexchange.com}.
%% <id-no> is the number following \qtdcode{/questions/}
%% in the \URL\ 
%% (the part of the \URL\ reflecting the caption are not needed).
%% See an example from 
%% $<id-no>=\stackexref{84878}{84878}$ in \secref{wiki-stack}. 
\newcommand*{\stackexref}{\stackquestionref{tex.stackexchange}}
\newcommand*{\stackquestionref}[2]{\httpref{#1.com/questions/#2}}
%% Likewise, \ |\stackoverref{<id-no>}{<text>}| \ links to 
%% \urlhttpref{stackoverflow.com}
%% ($<id-no>=\stackoverref{2118972}{2118972}$ is about file dates):
\newcommand*{\stackoverref}{\stackquestionref{stackoverflow}}
%% 
%% === \TUG                       ===               %% \TUG 2012/12/15
%% \label{sec:tug}                                  %% 2012/12/29
%% |\tugref{<path>}{<text>}| makes <text> a link
%% to <path> on domain `tug.org':
\MakeBasedHref{\tugref}{tug.org}
%% ==== texhax ====
%% \label{sec:texhax}                               %% 2015/05/28
%% |\texhaxref{<id>}{<text>}| makes <text> a link 
%% to the \TUG\ web page displaying 
%% a texhax posting. You find <id> by searching 
%% `tug.org/pipermail/texhax/' and then reading the \URL.
%% <id> is composed as `<year>-<month>/<6-digits>.html'.
\newcommand*{\texhaxref}[1]{\tugref{pipermail/texhax/#1}}
%% |\THref{<id>}| saves you from choosing <text> 
%% and uses `texhax' instead. 
\newcommand*{\THref}[1]{\texhaxref{#1}{texhax}}
%% (It was `\prg{texhax}' in 'blog.sty', to have something 
%%  logo-like, without a good idea how to implement it.)
%% 
%% |\texhaxpref{<id-code>}{<text>}| is a variant 
%% of `\texhaxref' where in place of <id> 
%% you only type the third and fourth digit of the 
%% year, then a `-', then the (arabic) number of 
%% the month, then another `-', and then the actual 
%% internal identifier 
%% (a number of six digits preceding `.html' of the \URL). 
%% I made this macro because I prefer typing to copying 
%% from the \URL. 
\newcommand*{\texhaxpref}[1]{%                          %% 2010/09/07
    \texhaxref{20\TL@piper@parse#1/\html}}              %% 2011/05/03
%% |\THpref{<id-code>}| is a variant of `\THref' using 
%% <id-code> as with `\texhaxpref':
\newcommand*{\THpref}[1]{\texhaxpref{#1}{texhax}}       %% 2011/03/24
%% TODO: `\texhaxPref#1' searches list of offsets 
%%       to determine year/month from id ...
%%
%% \[|\texhaxyearmonthref{<2-digits>-<month-no>}|\] generates 
%% `\texhaxref{<path>}' from \qtdcode{<2-digits>-<month-no>}---<path> 
%% as in \secref{mail} ...
\newcommand*{\texhaxyearmonthref}{\texlistyearmonthref\texhaxref}
%% \[|\texhaxmonthref{<2-digits>-<month-no>}|\] generates 
%% `\texhaxref{<path>}{<month>}' where <month> obeys `\langcode' ...
\newcommand*{\texhaxmonthref}{\texlistmonthref\texhaxref}
%% 
%% ==== Other  ====
%% %% 2011/04/27 corr. doc. vol/issue
%% |\tugbartref{tb<vol>-<issue>/<filename-base>}{<text>}| 
%% makes <text> a link to the \TUG boat article 
%% `<filename-base>.pdf' in vol.~<vol> and issue~<issue>:
% \newcommand*{\tugbartref}[1]{\tugref{TUGboat/Articles/#1\pdf}}
\newcommand*{\tugbartref}[1]{\tugref{TUGboat/#1.pdf}}
%% %% <- 2011/04/30
%% That `tb' can be dropped with 
%% \[|\tugbArtref{<vol>-<issue>/<filename-base>}{<text>}|\]
%% %% <- 2015/03/27 ->
%% after this definition:
\newcommand*{\tugbArtref}[1]{\tugbartref{tb#1}}
%% |\tugiref{<anchor>}{<text>}| makes <text>    %% <text> 2012/07/23 tugi 2012/08/05
%% a link to an <anchor> 
%% on the \TUG\ web page entitled \qtd{TeX Resources on the Web}
%% (e.g., $<anchor>=\mbox{\qtdcode{web}}$ shows the section entitled
%%  \tugiref{web}{\qtd{\TeX~web projects}}):
\newcommand*{\tugiref}[1]{\tugref{interest\html\##1}}
%% It was `\TUGIref' until v0.6, we keep this for compatibility
%% (deprecated):
\newlet\TUGIref\tugiref
%%
%% === \acro{UK FAQ}              ===
%% |\ukfaqref{<label>}{<text>}| makes <text> a link to 
%% the UK~\TeX~FAQ page with ``label"~= <label>:
\newcommand*{\ukfaqref}[1]{\httpref{%
%   www.tex.ac.uk/cgi-bin/texfaq2html?label=#1}}
    www.tex.ac.uk/FAQ-#1.html}}                     %% 2015/07/20
%% 
%% === Wikibooks                  ===
%% \label{sec:wikibooks}                        %% 2013/01/21
%% |\wikilangbooksref{<language-code>}{<book>/<subject>}{<text>}| 
%% %% <- ref 2012/10/04, <book>/<subject> 
\newcommand*{\wikilangbooksref}[1]{%         %% `lang' 2012/01/06
    \httpbaseref{#1.wikibooks.org/wiki}}
%% |\latexwikibookref{<subject>}{<text>}| \  %% \ 2012/12/16
%% refers to the %% rm. extra arg. 2012/10/24
%% (English) \latexwikibookref{}{\emph{\LaTeX} wikibook:} %% lc 2012/12/16
\newcommand*{\latexwikibookref}[1]{\wikilangbooksref{en}{LaTeX/#1}}
%% The German 
%% \wikilangbooksref{de}{LaTeX-Kompendium}{\dqtd{\LaTeX-Kompendium}}
%% is somewhat difficult, I leave it for now~...
%%
%% %% 2012/12/16:
%% |\texwikibookref{<subject>}{<text>}| \ refers to the 
%% % \texwikibookref{}{\emph{\TeX} wikibook.} 
%% \wikilangbooksref{en}{TeX}{\emph{\TeX} wikibook.} 
%% E.g., <subject> may access a description of the 
%% \wikilangbooksref{en}{TeX#TeX_Primitives}{\TeX\ \emph{primitive}} 
%% `\<subject>', such as `\texwikibookref{if}{\cs{if}}'
%% for \texwikibookref{if}{\cs{if}}. However, some primitives 
%% have not been described yet, and the whole \TeX\ wikibook 
%% largely is just a list of what needs to be done.
\newcommand*{\texwikibookref}[1]{\wikilangbooksref{en}{TeX/#1}}
%%
%% == Leaving and Version HISTORY ==                %% 2012/03/09
\endinput
%% VERSION HISTORY
v0.1    2011/01/24  new file, code from blog.sty v0.3
v0.2    2011/01/27  \urlfoot, \NormalHTTPref, \foothttpurlref,
                    "outline" adjusted; 
                    more consistent use of \newcommand and 
                    \@ifdefinable (TODO: guarded \let)
v0.3    2011/02/10  [blog]; \urlpkgfoot
v0.4    2011/04/27  doc. \tugbartref\ corrected
        2011/04/30  shortened link in \tugbartref 
        2011/05/03  \TL@piper@parse, tried \ctanannref
        2011/05/13  reworking Wikipedia, arbitrary languages 
        2011/06/27  doc.: \acro; \httpsref, \ctanannref 
        2011/07/23  doc.: typo \acro{TUG}, `Almost all', page breaks; 
                    \Wikidisambref: different order of arg.s
        2011/08/18  doc.: \acro with UK; wikibooks
        2011/08/27  doc. \acro with URL and PDF; 
                    more doc and code changes for https
uploaded with MOREHYPE r0.4 (not touched by r0.41)
v0.41   2011/09/03  doc.: more specific on \urluml/Wikipedia
        2011/10/06  \mirrorctanref, \tugctanfileref, 
                    \mirrorctanfileref, \ltxcontrib
        2011/10/10  doc. formatting of previous
uploaded with MOREHYPE r0.5(1)
v0.5    2011/10/19  doc. fix LaTeX Wikibook
        2011/10/20  \urlfmt, \filenamefmt and \pkgnamefmt
                    changed and moved, modified doc. on them, 
                    doc. uses \URL
        2011/10/21  re-order CTAN, \pagebreak's, \ctanref and 
                    choice for it, doc. modified; rm. \ithttpref
uploaded with MOREHYPE r0.52
v0.6    2012/01/06  \wikilangref etc., \wikiref etc. depend on 
                    \langcode 
        2012/01/11  removed old comments for Wikipedia; (C)
        2012/03/09  "URL bases" (\httpbaseref etc.), applied; 
                    \bytopicref uses \mirrorctanref
        2012/03/12  fixed \texhaxref
        2012/04/09  \ctanorgbaseref, \ctanpkgauref
        2012/04/10  makedoc link works!
        2012/05/13  example for \wikilangref corrected
uploaded with MOREHYPE r0.6
v0.7    2012/07/23  doc.: <text>
        2012/08/05  \tugiref
        2012/10/04  doc. wikibooks: ref
        2012/10/24  ...monthref... requiring `langcode.sty', moving 
                    links to mailing list pages from `texblog.fdf' 
                    here; doc.: \pagebreak s, wikibooks: <book>..., 
                    corr. args, \wikiref refers to `langcode.sty', 
                    `ref', using \qtdcode (new in `makedoc.cfg')
        2012/11/08  doc.: Jim corr.
        2012/11/27  \ctanpkgstyref from 'texblog.fdf'
        2012/11/28  [[...|...]]
uploaded with MOREHYPE r0.7
v0.7a   2012/12/01  link fix "Piped link"
        -> r0.7a
v0.7b   2012/12/06  there again: blogexec -> markblog, above entry ...
        -> r0.7b
v0.71   2012/12/08  \ctanannpref like \texhaxpref
        -> r0.71 

v0.8    2012/12/15  \domainref from `texblog.fdf'
                    doc.: \secref, gathering first subsections in 
                    new section "Links in General"
        2012/12/16  \texwikibooksref; \domainref 1 code line,
                    mod. doc. LaTeX wikibook
        2012/12/17  \google..., \stackexref, \catalogueref;
                    doc.: todo done + corr. in sec:bases, 
                    wiki extended, suffix -> tag
        2012/12/18  \cataloguestartref, \html
        2012/12/19  \cat@ctan@pkg@ref, \@double@first@arg; 
                    doc. uses {example}, \fbox, etc.
        2012/12/20  \ctanpkgtopicref
        -> r0.8
v0.81   2012/12/28  doc.: "fonts" \provide, corr. \pkgnamefmt,
                    reworked \urlfoot
        2012/12/29  \tugctanorg; doc.: TODO on "fonts", 
                    more on Jim ... \tugctanorg
        2012/12/30  ... in sec:search-pkg; mod. doc. \ctanpkgauref, 
                    more doc. wiki "overview", \simplecodefbox etc.,
        2012/12/31  doc. "the" Welcome ...
        -> r0.81
v0.82   2013/01/18   \tugctanorg -> alan.smcvt.edu
        2013/01/19   reworking doc. on CTAN; \pagebreak
        2013/01/20   updated (C), reworking doc. on CTAN
        2013/01/21   \MakeBasedHref, \wwwctanref, \usewwwctan, 
                     \newlet; doc.: typo fix, updated sec:x.ctan.org
        2013/01/21   applying \newlet, \myctanref, \usemyctan, 
                     \ctanfileref reimplemented, \filectanref, 
                     \dirctanref; doc.: \ltxcontrib with {example}
        -> r0.82
v0.83   2013/02/04   comment out code for alan.smcvt.edu and 
                     reduce doc. on it -- started
        2013/02/20   \tugbArtref; sec. "Obvious Shorthands": 
                     \hmtl moves, \htm, \pdf, \DoubleArg; 
                     some adjustments for AZ's vanishing;
                     doc. "Fonts for" -> "Formatting"
        2014/05/25   updated Google search link
        2015/03/27   doc. lines on "dropped" and "URL bases";
        2015/05/16   short UK FAQ URL
        2015/05/17f. new doc. CTAN: overview/summary
        2015/05/18   rm. old doc. on Jim, reducing CTAN base cmd.s
        2015/05/19   CTAN domains, description pages reworked
        2015/05/20   more discovering, tidyingm and reworking 
                     w.r.t. CTAN
        2015/05/21   doc. fix \dirctanref, ren. titles; \sciservref,
                     fewer CTAN domains, \texarchive and reworked ...
                     \awfulexample ... replaced
        2015/05/22   rm. bitelist considerations/\pagebreaks, 
                     different titles
        2015/05/23   typo fix; \nullctanorgbases, reduce table text;
                     \paragraph -> again reworking early parts of 
                     CTAN section
        2015/05/24   opening CTAN files ready; \prefixref;
                     doc.: removing page breaks
        2015/05/25   another \newlet; again reworking the CTAN 
                     tables section.
        2015/05/26   doc. \cat@ctan...; \nullctanorgbaseref etc.
                     -- finished CTAN section
        2015/05/28   some more doc. on mailing lists; \THpref;
                     rm. "short UK FAQ" -- did *not* work!
        2015/06/14   rm. spurious section title
        2015/07/20   another short URL for the UK FAQ