88 lines
4.1 KiB
Text
88 lines
4.1 KiB
Text
|
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
||
|
|
% Copyright © 2022 Maximilian Keßler
|
||
|
|
%
|
||
|
|
% Permission is hereby granted, free of charge, to any person obtaining a copy
|
||
|
|
% of this software and associated documentation files (the “Software”), to deal
|
||
|
|
% in the Software without restriction, including without limitation the rights
|
||
|
|
% to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||
|
|
% copies of the Software, and to permit persons to whom the Software is
|
||
|
|
% furnished to do so, subject to the following conditions:
|
||
|
|
% The above copyright notice and this permission notice shall be included in all
|
||
|
|
% copies or substantial portions of the Software.
|
||
|
|
%
|
||
|
|
% THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||
|
|
% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||
|
|
% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||
|
|
% AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||
|
|
% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||
|
|
% OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||
|
|
% SOFTWARE.
|
||
|
|
%
|
||
|
|
% This package has been generated by PyTeX, available at
|
||
|
|
% https://github.com/kesslermaximilian/PyTeX
|
||
|
|
% and built from source file 'findpackage.pysty'.
|
||
|
|
% It is STRONGLY DISCOURAGED to edit this source file directly, since local
|
||
|
|
% changes will not be versioned by Git and overwritten by the next build. Always
|
||
|
|
% edit the source file and build the package again.
|
||
|
|
%
|
||
|
|
% Build details:
|
||
|
|
% PyTeX version: v1.2.0-12-g75a2b13 (commit 75a2b13)
|
||
|
|
% Source code version: v2.5.1 (commit 50e2c7c)
|
||
|
|
%
|
||
|
|
% This LaTeX package is free software and distributed under the MIT License. You
|
||
|
|
% may use it freely for your purposes. The latest version of the package can be
|
||
|
|
% obtained via GitHub under
|
||
|
|
% https://github.com/kesslermaximilian/LatexPackages
|
||
|
|
% For further information see the url above.
|
||
|
|
% Reportings of bugs, suggestions and improvements are welcome, see the README
|
||
|
|
% at the Git repository for further information.
|
||
|
|
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
||
|
|
|
||
|
|
\NeedsTeXFormat{LaTeX2e}
|
||
|
|
\ProvidesPackage{mkessler-findpackage}[2022/01/11 - Find a package that provides some command]
|
||
|
|
|
||
|
|
|
||
|
|
% This is just a quick packaging of the post by
|
||
|
|
% 'Martin Nyolt' (https://tex.stackexchange.com/users/78783/martin-nyolt)
|
||
|
|
% found at
|
||
|
|
% https://tex.stackexchange.com/users/78783/martin-nyolt
|
||
|
|
% Note that SO answers are by default CC BY-SA 3.0 licensed, see
|
||
|
|
% https://creativecommons.org/licenses/by-sa/3.0/
|
||
|
|
|
||
|
|
\def\find@load#1[#2]#3[#4]{%
|
||
|
|
% load the package
|
||
|
|
\find@fileswith@pti@ns{#1}[#2]{#3}[#4]%
|
||
|
|
% check if commands exists now
|
||
|
|
\ifcsname\find@command\endcsname
|
||
|
|
\typeout{Package #3 introduces command \find@command.}%
|
||
|
|
% command has been found, revert to original version without checks
|
||
|
|
\let\@fileswith@pti@ns\find@fileswith@pti@ns
|
||
|
|
\else
|
||
|
|
% somehow, \@fileswith@pti@ns is restored after loading a package
|
||
|
|
% thus, patch it again
|
||
|
|
\let\@fileswith@pti@ns\find@load
|
||
|
|
\fi
|
||
|
|
}%
|
||
|
|
|
||
|
|
\newcommand*{\findpackagebycommand}[1]{%
|
||
|
|
% using this multiple times - esp. when the package has not been found yet -
|
||
|
|
% will break things. Thus, check first that \find@command has never been defined before
|
||
|
|
\ifx\find@command\undefined
|
||
|
|
\def\find@command{#1}%
|
||
|
|
% first, check if this command is already defined
|
||
|
|
\ifcsname\find@command\endcsname
|
||
|
|
% in this case, just issue a warning and do nothing
|
||
|
|
\@latex@warning@no@line{Command \find@command \space is already defined}%
|
||
|
|
\else
|
||
|
|
% overwrite the internal \@fileswith@pti@ns command, which does the actual loading
|
||
|
|
% \@fileswith@pti@ns is used internally by \usepackage and \RequirePackage
|
||
|
|
\let\find@fileswith@pti@ns\@fileswith@pti@ns
|
||
|
|
\let\@fileswith@pti@ns\find@load
|
||
|
|
\fi
|
||
|
|
\else
|
||
|
|
% used multiple times - prevent and give a warning
|
||
|
|
\@latex@warning@no@line{You can use \protect\findpackagebycommand \space only once}%
|
||
|
|
\errmessage{Invalid use of command findpackagebycommand.}%
|
||
|
|
\fi
|
||
|
|
}
|