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Conditionally execute a command if a specific package is loaded

How to conditionally load a package only if shell-escape (write18) is passedLoading a package conditionallyHow do I conditionally execute something based on a documentclass option?How do I execute some commands conditionally?How to implement a command that checks for loaded packages?How to warn if a package hasn't been loadedConditionally use package and define commandMaking a beamer section appear conditionally in TOC (on specific slide)?

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2

I am loading the gitver package based on the expl3 solution accepted for my question here.

However, I need to use some commands depending on whether the package has actually been loaded. For instance, using a combination of hyperxmp, hyperref and gitver, one can provide an option pdfversionid = gitVer to the hypersetup command (see code below).

The question is, how do I conditionally detect the presence of a package loaded (gitver in my example) and set up this conditional compilation?

Minimal conceptual example:

documentclass{article}

usepackage{expl3}

csname sys_if_shell_unrestricted:Tendcsname{usepackage{gitver}}

usepackage{hyperxmp}

usepackage{hyperref}





% this commented paragraph is conceptual & needs fixing through a solution from this forum

% hypersetup{%

% pdfversionid = {detect if gitver has been loaded & set to gitVer if so; otherwise set to empty {}}

% }%



begin{document}

Hello world!



% The following again describes my intended requirements in words

% detect if gitver has been loaded & print versionBox{} if so; otherwise print "gitver not loaded"



end{document}

packages conditionals condition

share|improve this question

asked 10 hours ago

KrishnaKrishna

1,26666 silver badges2020 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @UlrikeFischer. Breaks and complains loudly with error messages
  
  – Krishna
  9 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  did you use makeatletter?
  
  – Ulrike Fischer
  9 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @UlrikeFischer yes. works inside the preamble, but breaks within the document
  
  – Krishna
  9 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  the ltxcmds package has ltx@ifpackageloaded, that works in the document too.
  
  – Ulrike Fischer
  9 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @UlrikeFischer cool. the ltxcmds package worked great for me. Thank you!
  
  – Krishna
  9 hours ago
  

  
  
  
  

add a comment
 | 

2

I am loading the gitver package based on the expl3 solution accepted for my question here.

However, I need to use some commands depending on whether the package has actually been loaded. For instance, using a combination of hyperxmp, hyperref and gitver, one can provide an option pdfversionid = gitVer to the hypersetup command (see code below).

The question is, how do I conditionally detect the presence of a package loaded (gitver in my example) and set up this conditional compilation?

Minimal conceptual example:

documentclass{article}

usepackage{expl3}

csname sys_if_shell_unrestricted:Tendcsname{usepackage{gitver}}

usepackage{hyperxmp}

usepackage{hyperref}





% this commented paragraph is conceptual & needs fixing through a solution from this forum

% hypersetup{%

% pdfversionid = {detect if gitver has been loaded & set to gitVer if so; otherwise set to empty {}}

% }%



begin{document}

Hello world!



% The following again describes my intended requirements in words

% detect if gitver has been loaded & print versionBox{} if so; otherwise print "gitver not loaded"



end{document}

packages conditionals condition

share|improve this question

asked 10 hours ago

KrishnaKrishna

1,26666 silver badges2020 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @UlrikeFischer. Breaks and complains loudly with error messages
  
  – Krishna
  9 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  did you use makeatletter?
  
  – Ulrike Fischer
  9 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @UlrikeFischer yes. works inside the preamble, but breaks within the document
  
  – Krishna
  9 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  the ltxcmds package has ltx@ifpackageloaded, that works in the document too.
  
  – Ulrike Fischer
  9 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @UlrikeFischer cool. the ltxcmds package worked great for me. Thank you!
  
  – Krishna
  9 hours ago
  

  
  
  
  

add a comment
 | 

I am loading the gitver package based on the expl3 solution accepted for my question here.

However, I need to use some commands depending on whether the package has actually been loaded. For instance, using a combination of hyperxmp, hyperref and gitver, one can provide an option pdfversionid = gitVer to the hypersetup command (see code below).

The question is, how do I conditionally detect the presence of a package loaded (gitver in my example) and set up this conditional compilation?

Minimal conceptual example:

documentclass{article}

usepackage{expl3}

csname sys_if_shell_unrestricted:Tendcsname{usepackage{gitver}}

usepackage{hyperxmp}

usepackage{hyperref}





% this commented paragraph is conceptual & needs fixing through a solution from this forum

% hypersetup{%

% pdfversionid = {detect if gitver has been loaded & set to gitVer if so; otherwise set to empty {}}

% }%



begin{document}

Hello world!



% The following again describes my intended requirements in words

% detect if gitver has been loaded & print versionBox{} if so; otherwise print "gitver not loaded"



end{document}

packages conditionals condition

share|improve this question

asked 10 hours ago

KrishnaKrishna

1,26666 silver badges2020 bronze badges

documentclass{article}

usepackage{expl3}

csname sys_if_shell_unrestricted:Tendcsname{usepackage{gitver}}

usepackage{hyperxmp}

usepackage{hyperref}





% this commented paragraph is conceptual & needs fixing through a solution from this forum

% hypersetup{%

% pdfversionid = {detect if gitver has been loaded & set to gitVer if so; otherwise set to empty {}}

% }%



begin{document}

Hello world!



% The following again describes my intended requirements in words

% detect if gitver has been loaded & print versionBox{} if so; otherwise print "gitver not loaded"



end{document}

share|improve this question

asked 10 hours ago

KrishnaKrishna

1,26666 silver badges2020 bronze badges

share|improve this question

asked 10 hours ago

KrishnaKrishna

1,26666 silver badges2020 bronze badges

asked 10 hours ago

KrishnaKrishna

1,26666 silver badges2020 bronze badges

asked 10 hours ago

KrishnaKrishna

1,26666 silver badges2020 bronze badges

2 Answers
2

active

oldest

votes

3

Normally you would just use @ifpackageloaded, but the command is limited to the preamble. To use it in the document body you need ltx@ifpackageloaded from the ltxcmds package. Since the macro has an @ in the name, you need to wrap it in makeatletter and makeatother.

documentclass{article}

usepackage{expl3}

usepackage{ltxcmds}

%csname sys_if_shell_unrestricted:Tendcsname{usepackage{gitver}}

usepackage{hyperxmp}

usepackage{hyperref}



makeatletter

% this commented paragraph is conceptual & needs fixing through a solution from this forum

@ifpackageloaded{gitver}{

  hypersetup{pdfversionid = gitVer}

}{

  hypersetup{pdfversionid = {}}

}

makeatother



begin{document}

Hello world!



meaninggitVer

% The following again describes my intended requirements in words

% detect if gitver has been loaded & print versionBox{} if so; otherwise print "gitver not loaded"

makeatletter

ltx@ifpackageloaded{gitver}{versionBox{}}{gitver not loaded}

makeatother



end{document}

share|improve this answer

answered 9 hours ago

StrongBadStrongBad

13.6k66 gold badges5050 silver badges107107 bronze badges

add a comment
 | 

5

Assuming that gitVer and VersionBox are defined by gitver, just add

providecommand{gitVer}{}

providecommand{VersionBox}[1]{gitver not loaded}

after the conditional loading.

This exploits the fact that providecommand does nothing if the command is already defined.

share|improve this answer

answered 9 hours ago

egregegreg

770k9191 gold badges20112011 silver badges33673367 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  thank you. It worked for me. However, I think the ltxcmds package is a bit more flexible, and hence I'd like to accept that answer. However, yours is a valid solution and I am upvoting this.
  
  – Krishna
  9 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Krishna I disagree about the flexibility and you're fill your document with extraneous bits of code.
  
  – egreg
  9 hours ago
  
  
  

  
  
  
  

add a comment
 | 

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3

Normally you would just use @ifpackageloaded, but the command is limited to the preamble. To use it in the document body you need ltx@ifpackageloaded from the ltxcmds package. Since the macro has an @ in the name, you need to wrap it in makeatletter and makeatother.

documentclass{article}

usepackage{expl3}

usepackage{ltxcmds}

%csname sys_if_shell_unrestricted:Tendcsname{usepackage{gitver}}

usepackage{hyperxmp}

usepackage{hyperref}



makeatletter

% this commented paragraph is conceptual & needs fixing through a solution from this forum

@ifpackageloaded{gitver}{

  hypersetup{pdfversionid = gitVer}

}{

  hypersetup{pdfversionid = {}}

}

makeatother



begin{document}

Hello world!



meaninggitVer

% The following again describes my intended requirements in words

% detect if gitver has been loaded & print versionBox{} if so; otherwise print "gitver not loaded"

makeatletter

ltx@ifpackageloaded{gitver}{versionBox{}}{gitver not loaded}

makeatother



end{document}

share|improve this answer

answered 9 hours ago

StrongBadStrongBad

13.6k66 gold badges5050 silver badges107107 bronze badges

add a comment
 | 

3

Normally you would just use @ifpackageloaded, but the command is limited to the preamble. To use it in the document body you need ltx@ifpackageloaded from the ltxcmds package. Since the macro has an @ in the name, you need to wrap it in makeatletter and makeatother.

documentclass{article}

usepackage{expl3}

usepackage{ltxcmds}

%csname sys_if_shell_unrestricted:Tendcsname{usepackage{gitver}}

usepackage{hyperxmp}

usepackage{hyperref}



makeatletter

% this commented paragraph is conceptual & needs fixing through a solution from this forum

@ifpackageloaded{gitver}{

  hypersetup{pdfversionid = gitVer}

}{

  hypersetup{pdfversionid = {}}

}

makeatother



begin{document}

Hello world!



meaninggitVer

% The following again describes my intended requirements in words

% detect if gitver has been loaded & print versionBox{} if so; otherwise print "gitver not loaded"

makeatletter

ltx@ifpackageloaded{gitver}{versionBox{}}{gitver not loaded}

makeatother



end{document}

share|improve this answer

answered 9 hours ago

StrongBadStrongBad

13.6k66 gold badges5050 silver badges107107 bronze badges

add a comment
 | 

Normally you would just use @ifpackageloaded, but the command is limited to the preamble. To use it in the document body you need ltx@ifpackageloaded from the ltxcmds package. Since the macro has an @ in the name, you need to wrap it in makeatletter and makeatother.

documentclass{article}

usepackage{expl3}

usepackage{ltxcmds}

%csname sys_if_shell_unrestricted:Tendcsname{usepackage{gitver}}

usepackage{hyperxmp}

usepackage{hyperref}



makeatletter

% this commented paragraph is conceptual & needs fixing through a solution from this forum

@ifpackageloaded{gitver}{

  hypersetup{pdfversionid = gitVer}

}{

  hypersetup{pdfversionid = {}}

}

makeatother



begin{document}

Hello world!



meaninggitVer

% The following again describes my intended requirements in words

% detect if gitver has been loaded & print versionBox{} if so; otherwise print "gitver not loaded"

makeatletter

ltx@ifpackageloaded{gitver}{versionBox{}}{gitver not loaded}

makeatother



end{document}

share|improve this answer

answered 9 hours ago

StrongBadStrongBad

13.6k66 gold badges5050 silver badges107107 bronze badges

documentclass{article}

usepackage{expl3}

usepackage{ltxcmds}

%csname sys_if_shell_unrestricted:Tendcsname{usepackage{gitver}}

usepackage{hyperxmp}

usepackage{hyperref}



makeatletter

% this commented paragraph is conceptual & needs fixing through a solution from this forum

@ifpackageloaded{gitver}{

  hypersetup{pdfversionid = gitVer}

}{

  hypersetup{pdfversionid = {}}

}

makeatother



begin{document}

Hello world!



meaninggitVer

% The following again describes my intended requirements in words

% detect if gitver has been loaded & print versionBox{} if so; otherwise print "gitver not loaded"

makeatletter

ltx@ifpackageloaded{gitver}{versionBox{}}{gitver not loaded}

makeatother



end{document}

share|improve this answer

answered 9 hours ago

StrongBadStrongBad

13.6k66 gold badges5050 silver badges107107 bronze badges

answered 9 hours ago

StrongBadStrongBad

13.6k66 gold badges5050 silver badges107107 bronze badges

answered 9 hours ago

StrongBadStrongBad

13.6k66 gold badges5050 silver badges107107 bronze badges

5

Assuming that gitVer and VersionBox are defined by gitver, just add

providecommand{gitVer}{}

providecommand{VersionBox}[1]{gitver not loaded}

after the conditional loading.

This exploits the fact that providecommand does nothing if the command is already defined.

share|improve this answer

answered 9 hours ago

egregegreg

770k9191 gold badges20112011 silver badges33673367 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  thank you. It worked for me. However, I think the ltxcmds package is a bit more flexible, and hence I'd like to accept that answer. However, yours is a valid solution and I am upvoting this.
  
  – Krishna
  9 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Krishna I disagree about the flexibility and you're fill your document with extraneous bits of code.
  
  – egreg
  9 hours ago
  
  
  

  
  
  
  

add a comment
 | 

5

Assuming that gitVer and VersionBox are defined by gitver, just add

providecommand{gitVer}{}

providecommand{VersionBox}[1]{gitver not loaded}

after the conditional loading.

This exploits the fact that providecommand does nothing if the command is already defined.

share|improve this answer

answered 9 hours ago

egregegreg

770k9191 gold badges20112011 silver badges33673367 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  thank you. It worked for me. However, I think the ltxcmds package is a bit more flexible, and hence I'd like to accept that answer. However, yours is a valid solution and I am upvoting this.
  
  – Krishna
  9 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Krishna I disagree about the flexibility and you're fill your document with extraneous bits of code.
  
  – egreg
  9 hours ago
  
  
  

  
  
  
  

add a comment
 | 

Assuming that gitVer and VersionBox are defined by gitver, just add

providecommand{gitVer}{}

providecommand{VersionBox}[1]{gitver not loaded}

after the conditional loading.

This exploits the fact that providecommand does nothing if the command is already defined.

share|improve this answer

answered 9 hours ago

egregegreg

770k9191 gold badges20112011 silver badges33673367 bronze badges

providecommand{gitVer}{}

providecommand{VersionBox}[1]{gitver not loaded}

share|improve this answer

answered 9 hours ago

egregegreg

770k9191 gold badges20112011 silver badges33673367 bronze badges

answered 9 hours ago

egregegreg

770k9191 gold badges20112011 silver badges33673367 bronze badges

answered 9 hours ago

egregegreg

770k9191 gold badges20112011 silver badges33673367 bronze badges