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How to detect whether PassOptionsToPackage was already called?

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1

1

If I call:

PassOptionsToPackage{backend=biber,style=numeric,backref=false}{biblatex}



% And later someone else call again

PassOptionsToPackage{style=abnt,backend=biber}{biblatex}

What will happen?

Can I detect whether someone else had already called PassOptionsToPackage and do not override their definitions?

optional-arguments package-options class-options options

share|improve this question

asked 7 hours ago

useruser

1,2602930

add a comment | 

1

1

If I call:

PassOptionsToPackage{backend=biber,style=numeric,backref=false}{biblatex}



% And later someone else call again

PassOptionsToPackage{style=abnt,backend=biber}{biblatex}

What will happen?

Can I detect whether someone else had already called PassOptionsToPackage and do not override their definitions?

optional-arguments package-options class-options options

share|improve this question

asked 7 hours ago

useruser

1,2602930

add a comment | 

If I call:

PassOptionsToPackage{backend=biber,style=numeric,backref=false}{biblatex}



% And later someone else call again

PassOptionsToPackage{style=abnt,backend=biber}{biblatex}

What will happen?

Can I detect whether someone else had already called PassOptionsToPackage and do not override their definitions?

optional-arguments package-options class-options options

share|improve this question

asked 7 hours ago

useruser

1,2602930

PassOptionsToPackage{backend=biber,style=numeric,backref=false}{biblatex}



% And later someone else call again

PassOptionsToPackage{style=abnt,backend=biber}{biblatex}

share|improve this question

asked 7 hours ago

useruser

1,2602930

share|improve this question

asked 7 hours ago

useruser

1,2602930

asked 7 hours ago

useruser

1,2602930

asked 7 hours ago

useruser

1,2602930

1 Answer
1

active

oldest

votes

2

The definition of PassOptionsToPackage is

% latex.ltx, line 7784:

defPassOptionsToPackage{@pass@ptions@pkgextension}

and we can look at @pass@ptions:

% latex.ltx, line 7778:

def@pass@ptions#1#2#3{%

  expandafterxdefcsname opt@#3.#1endcsname{%

    @ifundefined{opt@#3.#1}@empty

      {csname opt@#3.#1endcsname,}%

    zap@space#2 @empty}}

Suppose we call PassOptionsToPackage{baz}{foo}. If opt@foo.sty (can only be formed with csname) is undefined, it is defined to expand to baz. If it is already defined, say to gnu,gnat, then it will be redefined to expand to gnu,gnat,baz.

The latter case can happen either if PassOptionsToPackage{...}{foo} has already been called or the package has already been loaded. In the second case PassOptionsToPackage{baz}{foo} does nothing.

As you see, new sets of options are chained to the already existing ones. It's then a job of the package, when loaded, to make its way amongst them.

This should also answer your question about detection: you can use

ifcsname opt@foo.styendcsname

  <options have already been passed or the package has already been loaded>

else

  <no options have been passed yet>

fi

share|improve this answer

answered 6 hours ago

egregegreg

732k8919303253

add a comment | 

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2

The definition of PassOptionsToPackage is

% latex.ltx, line 7784:

defPassOptionsToPackage{@pass@ptions@pkgextension}

and we can look at @pass@ptions:

% latex.ltx, line 7778:

def@pass@ptions#1#2#3{%

  expandafterxdefcsname opt@#3.#1endcsname{%

    @ifundefined{opt@#3.#1}@empty

      {csname opt@#3.#1endcsname,}%

    zap@space#2 @empty}}

Suppose we call PassOptionsToPackage{baz}{foo}. If opt@foo.sty (can only be formed with csname) is undefined, it is defined to expand to baz. If it is already defined, say to gnu,gnat, then it will be redefined to expand to gnu,gnat,baz.

The latter case can happen either if PassOptionsToPackage{...}{foo} has already been called or the package has already been loaded. In the second case PassOptionsToPackage{baz}{foo} does nothing.

As you see, new sets of options are chained to the already existing ones. It's then a job of the package, when loaded, to make its way amongst them.

This should also answer your question about detection: you can use

ifcsname opt@foo.styendcsname

  <options have already been passed or the package has already been loaded>

else

  <no options have been passed yet>

fi

share|improve this answer

answered 6 hours ago

egregegreg

732k8919303253

add a comment | 

2

The definition of PassOptionsToPackage is

% latex.ltx, line 7784:

defPassOptionsToPackage{@pass@ptions@pkgextension}

and we can look at @pass@ptions:

% latex.ltx, line 7778:

def@pass@ptions#1#2#3{%

  expandafterxdefcsname opt@#3.#1endcsname{%

    @ifundefined{opt@#3.#1}@empty

      {csname opt@#3.#1endcsname,}%

    zap@space#2 @empty}}

Suppose we call PassOptionsToPackage{baz}{foo}. If opt@foo.sty (can only be formed with csname) is undefined, it is defined to expand to baz. If it is already defined, say to gnu,gnat, then it will be redefined to expand to gnu,gnat,baz.

The latter case can happen either if PassOptionsToPackage{...}{foo} has already been called or the package has already been loaded. In the second case PassOptionsToPackage{baz}{foo} does nothing.

As you see, new sets of options are chained to the already existing ones. It's then a job of the package, when loaded, to make its way amongst them.

This should also answer your question about detection: you can use

ifcsname opt@foo.styendcsname

  <options have already been passed or the package has already been loaded>

else

  <no options have been passed yet>

fi

share|improve this answer

answered 6 hours ago

egregegreg

732k8919303253

add a comment | 

The definition of PassOptionsToPackage is

% latex.ltx, line 7784:

defPassOptionsToPackage{@pass@ptions@pkgextension}

and we can look at @pass@ptions:

% latex.ltx, line 7778:

def@pass@ptions#1#2#3{%

  expandafterxdefcsname opt@#3.#1endcsname{%

    @ifundefined{opt@#3.#1}@empty

      {csname opt@#3.#1endcsname,}%

    zap@space#2 @empty}}

Suppose we call PassOptionsToPackage{baz}{foo}. If opt@foo.sty (can only be formed with csname) is undefined, it is defined to expand to baz. If it is already defined, say to gnu,gnat, then it will be redefined to expand to gnu,gnat,baz.

The latter case can happen either if PassOptionsToPackage{...}{foo} has already been called or the package has already been loaded. In the second case PassOptionsToPackage{baz}{foo} does nothing.

As you see, new sets of options are chained to the already existing ones. It's then a job of the package, when loaded, to make its way amongst them.

This should also answer your question about detection: you can use

ifcsname opt@foo.styendcsname

  <options have already been passed or the package has already been loaded>

else

  <no options have been passed yet>

fi

share|improve this answer

answered 6 hours ago

egregegreg

732k8919303253

% latex.ltx, line 7784:

defPassOptionsToPackage{@pass@ptions@pkgextension}

% latex.ltx, line 7778:

def@pass@ptions#1#2#3{%

  expandafterxdefcsname opt@#3.#1endcsname{%

    @ifundefined{opt@#3.#1}@empty

      {csname opt@#3.#1endcsname,}%

    zap@space#2 @empty}}

ifcsname opt@foo.styendcsname

  <options have already been passed or the package has already been loaded>

else

  <no options have been passed yet>

fi

share|improve this answer

answered 6 hours ago

egregegreg

732k8919303253

answered 6 hours ago

egregegreg

732k8919303253

answered 6 hours ago

egregegreg

732k8919303253