88 lines
4.1 KiB
Text
88 lines
4.1 KiB
Text
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% Copyright © 2022 Maximilian Keßler
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%
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% Permission is hereby granted, free of charge, to any person obtaining a copy
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% of this software and associated documentation files (the “Software”), to deal
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% in the Software without restriction, including without limitation the rights
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% to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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% copies of the Software, and to permit persons to whom the Software is
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% furnished to do so, subject to the following conditions:
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% The above copyright notice and this permission notice shall be included in all
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% copies or substantial portions of the Software.
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%
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% THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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% AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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% OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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% SOFTWARE.
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%
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% This package has been generated by PyTeX, available at
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% https://github.com/kesslermaximilian/PyTeX
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% and built from source file 'findpackage.pysty'.
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% It is STRONGLY DISCOURAGED to edit this source file directly, since local
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% changes will not be versioned by Git and overwritten by the next build. Always
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% edit the source file and build the package again.
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%
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% Build details:
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% PyTeX version: v1.2.0-26-g6048812 (commit 6048812)
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% Source code version: v2.5.1-11-gf574ac6 (commit f574ac6)
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%
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% This LaTeX package is free software and distributed under the MIT License. You
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% may use it freely for your purposes. The latest version of the package can be
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% obtained via GitHub under
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% https://github.com/kesslermaximilian/LatexPackages
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% For further information see the url above.
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% Reportings of bugs, suggestions and improvements are welcome, see the README
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% at the Git repository for further information.
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\NeedsTeXFormat{LaTeX2e}
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\ProvidesPackage{mkessler-findpackage}[2022/01/13 - Find a package that provides some command]
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% This is just a quick packaging of the post by
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% 'Martin Nyolt' (https://tex.stackexchange.com/users/78783/martin-nyolt)
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% found at
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% https://tex.stackexchange.com/users/78783/martin-nyolt
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% Note that SO answers are by default CC BY-SA 3.0 licensed, see
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% https://creativecommons.org/licenses/by-sa/3.0/
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\def\find@load#1[#2]#3[#4]{%
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% load the package
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\find@fileswith@pti@ns{#1}[#2]{#3}[#4]%
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% check if commands exists now
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\ifcsname\find@command\endcsname
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\typeout{Package #3 introduces command \find@command.}%
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% command has been found, revert to original version without checks
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\let\@fileswith@pti@ns\find@fileswith@pti@ns
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\else
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% somehow, \@fileswith@pti@ns is restored after loading a package
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% thus, patch it again
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\let\@fileswith@pti@ns\find@load
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\fi
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}%
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\newcommand*{\findpackagebycommand}[1]{%
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% using this multiple times - esp. when the package has not been found yet -
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% will break things. Thus, check first that \find@command has never been defined before
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\ifx\find@command\undefined
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\def\find@command{#1}%
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% first, check if this command is already defined
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\ifcsname\find@command\endcsname
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% in this case, just issue a warning and do nothing
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\@latex@warning@no@line{Command \find@command \space is already defined}%
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\else
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% overwrite the internal \@fileswith@pti@ns command, which does the actual loading
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% \@fileswith@pti@ns is used internally by \usepackage and \RequirePackage
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\let\find@fileswith@pti@ns\@fileswith@pti@ns
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\let\@fileswith@pti@ns\find@load
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\fi
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\else
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% used multiple times - prevent and give a warning
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\@latex@warning@no@line{You can use \protect\findpackagebycommand \space only once}%
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\errmessage{Invalid use of command findpackagebycommand.}%
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\fi
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}
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