Process LaTeX code only if package is loaded
4
I would like to create a document used to test diverse packages, and I was wondering if it was possible to use a command so that part of the code is read only if the corresponding package is loaded. I've come up with this but it throws an error which I don't know how to fix.
documentclass{article}
usepackage[utf8]{inputenc}
makeatletter
newcommand{IfPackageLoaded}[3]{@ifpackageloaded{#1}{#2}{#3}}
makeatother
begin{document}
IfPackageLoaded{natbib}{natbib loaded}{natbib not loaded}
end{document}
I get this error:
! LaTeX Error: Can be used only in preamble.
See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...
l.10 IfPackageLoaded{natbib}{natbib loaded}
{natbib not loaded}
Your command was ignored.
Type I <command> <return> to replace it with another command,
or <return> to continue without it.
I also know that the command ltx@ifpackageloaded exists when loading the package ltxcmds but when I try to use it in
documentclass{article}
usepackage[utf8]{inputenc}
usepackage{ltxcmds}
begin{document}
ltx@ifpackageloaded{natbib}{natbib loaded}{natbib not loaded}
end{document}
I get this error message:
! Undefined control sequence.
l.11 ltx
@ifpackageloaded{natbib}{natbib loaded}{natbib not loaded}
The control sequence at the end of the top line
of your error message was never def'ed. If you have
misspelled it (e.g., `hobx'), type `I' and the correct
spelling (e.g., `Ihbox'). Otherwise just continue,
and I'll forget about whatever was undefined.
Can someone please point out what I did wrong?
EDIT: changed documentclass from minimal to article.
packages
asked 18 hours ago
lashounlashoun
615
New contributor
lashoun is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
4
I would like to create a document used to test diverse packages, and I was wondering if it was possible to use a command so that part of the code is read only if the corresponding package is loaded. I've come up with this but it throws an error which I don't know how to fix.
documentclass{article}
usepackage[utf8]{inputenc}
makeatletter
newcommand{IfPackageLoaded}[3]{@ifpackageloaded{#1}{#2}{#3}}
makeatother
begin{document}
IfPackageLoaded{natbib}{natbib loaded}{natbib not loaded}
end{document}
I get this error:
! LaTeX Error: Can be used only in preamble.
See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...
l.10 IfPackageLoaded{natbib}{natbib loaded}
{natbib not loaded}
Your command was ignored.
Type I <command> <return> to replace it with another command,
or <return> to continue without it.
I also know that the command ltx@ifpackageloaded exists when loading the package ltxcmds but when I try to use it in
documentclass{article}
usepackage[utf8]{inputenc}
usepackage{ltxcmds}
begin{document}
ltx@ifpackageloaded{natbib}{natbib loaded}{natbib not loaded}
end{document}
I get this error message:
! Undefined control sequence.
l.11 ltx
@ifpackageloaded{natbib}{natbib loaded}{natbib not loaded}
The control sequence at the end of the top line
of your error message was never def'ed. If you have
misspelled it (e.g., `hobx'), type `I' and the correct
spelling (e.g., `Ihbox'). Otherwise just continue,
and I'll forget about whatever was undefined.
Can someone please point out what I did wrong?
EDIT: changed documentclass from minimal to article.
packages
asked 18 hours ago
lashounlashoun
615
New contributor
lashoun is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
2
You are missing themakeatletterin your second example. And don't use the minimal class, normally it is too minimal.
– Ulrike Fischer
18 hours ago
Read more: tex.stackexchange.com/q/8351/156344
– JouleV
18 hours ago
It is said in theltxcmdsdocumentation thatltx@ifpackageloadedcan be used afterbegin{document}though.
– lashoun
18 hours ago
But even then it can only be used if you wrap it inmakeatletter...makeatotherbecause it has an@in its name.
– moewe
18 hours ago
Oooh, that's why! I'll try then.
– lashoun
18 hours ago
add a comment |
4
4
4
I would like to create a document used to test diverse packages, and I was wondering if it was possible to use a command so that part of the code is read only if the corresponding package is loaded. I've come up with this but it throws an error which I don't know how to fix.
documentclass{article}
usepackage[utf8]{inputenc}
makeatletter
newcommand{IfPackageLoaded}[3]{@ifpackageloaded{#1}{#2}{#3}}
makeatother
begin{document}
IfPackageLoaded{natbib}{natbib loaded}{natbib not loaded}
end{document}
I get this error:
! LaTeX Error: Can be used only in preamble.
See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...
l.10 IfPackageLoaded{natbib}{natbib loaded}
{natbib not loaded}
Your command was ignored.
Type I <command> <return> to replace it with another command,
or <return> to continue without it.
I also know that the command ltx@ifpackageloaded exists when loading the package ltxcmds but when I try to use it in
documentclass{article}
usepackage[utf8]{inputenc}
usepackage{ltxcmds}
begin{document}
ltx@ifpackageloaded{natbib}{natbib loaded}{natbib not loaded}
end{document}
I get this error message:
! Undefined control sequence.
l.11 ltx
@ifpackageloaded{natbib}{natbib loaded}{natbib not loaded}
The control sequence at the end of the top line
of your error message was never def'ed. If you have
misspelled it (e.g., `hobx'), type `I' and the correct
spelling (e.g., `Ihbox'). Otherwise just continue,
and I'll forget about whatever was undefined.
Can someone please point out what I did wrong?
EDIT: changed documentclass from minimal to article.
packages
asked 18 hours ago
lashounlashoun
615
New contributor
lashoun is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I would like to create a document used to test diverse packages, and I was wondering if it was possible to use a command so that part of the code is read only if the corresponding package is loaded. I've come up with this but it throws an error which I don't know how to fix.
documentclass{article}
usepackage[utf8]{inputenc}
makeatletter
newcommand{IfPackageLoaded}[3]{@ifpackageloaded{#1}{#2}{#3}}
makeatother
begin{document}
IfPackageLoaded{natbib}{natbib loaded}{natbib not loaded}
end{document}
I get this error:
! LaTeX Error: Can be used only in preamble.
See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...
l.10 IfPackageLoaded{natbib}{natbib loaded}
{natbib not loaded}
Your command was ignored.
Type I <command> <return> to replace it with another command,
or <return> to continue without it.
I also know that the command ltx@ifpackageloaded exists when loading the package ltxcmds but when I try to use it in
documentclass{article}
usepackage[utf8]{inputenc}
usepackage{ltxcmds}
begin{document}
ltx@ifpackageloaded{natbib}{natbib loaded}{natbib not loaded}
end{document}
I get this error message:
! Undefined control sequence.
l.11 ltx
@ifpackageloaded{natbib}{natbib loaded}{natbib not loaded}
The control sequence at the end of the top line
of your error message was never def'ed. If you have
misspelled it (e.g., `hobx'), type `I' and the correct
spelling (e.g., `Ihbox'). Otherwise just continue,
and I'll forget about whatever was undefined.
Can someone please point out what I did wrong?
EDIT: changed documentclass from minimal to article.
packages
packages
asked 18 hours ago
lashounlashoun
615
New contributor
lashoun is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 18 hours ago
lashounlashoun
615
New contributor
lashoun is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 18 hours ago
lashoun
asked 18 hours ago
lashounlashoun
615
New contributor
lashoun is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 18 hours ago
lashounlashoun
615
asked 18 hours ago
lashounlashoun
615
615
New contributor
lashoun is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
lashoun is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
lashoun is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
2
You are missing themakeatletterin your second example. And don't use the minimal class, normally it is too minimal.
– Ulrike Fischer
18 hours ago
Read more: tex.stackexchange.com/q/8351/156344
– JouleV
18 hours ago
It is said in theltxcmdsdocumentation thatltx@ifpackageloadedcan be used afterbegin{document}though.
– lashoun
18 hours ago
But even then it can only be used if you wrap it inmakeatletter...makeatotherbecause it has an@in its name.
– moewe
18 hours ago
Oooh, that's why! I'll try then.
– lashoun
18 hours ago
add a comment |
2
You are missing themakeatletterin your second example. And don't use the minimal class, normally it is too minimal.
– Ulrike Fischer
18 hours ago
Read more: tex.stackexchange.com/q/8351/156344
– JouleV
18 hours ago
It is said in theltxcmdsdocumentation thatltx@ifpackageloadedcan be used afterbegin{document}though.
– lashoun
18 hours ago
But even then it can only be used if you wrap it inmakeatletter...makeatotherbecause it has an@in its name.
– moewe
18 hours ago
Oooh, that's why! I'll try then.
– lashoun
18 hours ago
2
2
You are missing the
makeatletter in your second example. And don't use the minimal class, normally it is too minimal.– Ulrike Fischer
18 hours ago
You are missing the
makeatletter in your second example. And don't use the minimal class, normally it is too minimal.– Ulrike Fischer
18 hours ago
Read more: tex.stackexchange.com/q/8351/156344
– JouleV
18 hours ago
Read more: tex.stackexchange.com/q/8351/156344
– JouleV
18 hours ago
It is said in the
ltxcmds documentation that ltx@ifpackageloaded can be used after begin{document} though.– lashoun
18 hours ago
It is said in the
ltxcmds documentation that ltx@ifpackageloaded can be used after begin{document} though.– lashoun
18 hours ago
But even then it can only be used if you wrap it in
makeatletter...makeatother because it has an @ in its name.– moewe
18 hours ago
But even then it can only be used if you wrap it in
makeatletter...makeatother because it has an @ in its name.– moewe
18 hours ago
Oooh, that's why! I'll try then.
– lashoun
18 hours ago
Oooh, that's why! I'll try then.
– lashoun
18 hours ago
add a comment |
1 Answer
1
active
oldest
votes
4
As users Ulrike Fischer and moewe pointed out, this works:
documentclass{article}
usepackage[utf8]{inputenc}
usepackage{ltxcmds}
makeatletter
newcommand{IfPackageLoaded}[3]{ltx@ifpackageloaded{#1}{#2}{#3}}
makeatother
begin{document}
IfPackageLoaded{natbib}{natbib loaded}{natbib not loaded}
end{document}
edited 18 hours ago
Schweinebacke
22.5k4577
answered 18 hours ago
lashounlashoun
615
New contributor
lashoun is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
2
BTW: The[3]is not needed. You can simply usenewcommand*{IfPackageLoaded}{ltx@ifpackageloaded}.
– Schweinebacke
18 hours ago
@Schweinebacke RIght; alsoletIfPackageLoadedltx@ifpackageloaded
– egreg
17 hours ago
@egreg Yes, becauseltx@ifpackageloadedis a simple macro. If it would be, e.g., robust, it could be better to useLetLtxMacrofrom packageletltxmacro. I didn't want to explain all this, so I've only noted about usingnewcommand*without arguments.
– Schweinebacke
17 hours ago
Thanks for the precisions
– lashoun
16 hours ago
add a comment |
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4
As users Ulrike Fischer and moewe pointed out, this works:
documentclass{article}
usepackage[utf8]{inputenc}
usepackage{ltxcmds}
makeatletter
newcommand{IfPackageLoaded}[3]{ltx@ifpackageloaded{#1}{#2}{#3}}
makeatother
begin{document}
IfPackageLoaded{natbib}{natbib loaded}{natbib not loaded}
end{document}
edited 18 hours ago
Schweinebacke
22.5k4577
answered 18 hours ago
lashounlashoun
615
New contributor
lashoun is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
2
BTW: The[3]is not needed. You can simply usenewcommand*{IfPackageLoaded}{ltx@ifpackageloaded}.
– Schweinebacke
18 hours ago
@Schweinebacke RIght; alsoletIfPackageLoadedltx@ifpackageloaded
– egreg
17 hours ago
@egreg Yes, becauseltx@ifpackageloadedis a simple macro. If it would be, e.g., robust, it could be better to useLetLtxMacrofrom packageletltxmacro. I didn't want to explain all this, so I've only noted about usingnewcommand*without arguments.
– Schweinebacke
17 hours ago
Thanks for the precisions
– lashoun
16 hours ago
add a comment |
4
As users Ulrike Fischer and moewe pointed out, this works:
documentclass{article}
usepackage[utf8]{inputenc}
usepackage{ltxcmds}
makeatletter
newcommand{IfPackageLoaded}[3]{ltx@ifpackageloaded{#1}{#2}{#3}}
makeatother
begin{document}
IfPackageLoaded{natbib}{natbib loaded}{natbib not loaded}
end{document}
edited 18 hours ago
Schweinebacke
22.5k4577
answered 18 hours ago
lashounlashoun
615
New contributor
lashoun is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
2
BTW: The[3]is not needed. You can simply usenewcommand*{IfPackageLoaded}{ltx@ifpackageloaded}.
– Schweinebacke
18 hours ago
@Schweinebacke RIght; alsoletIfPackageLoadedltx@ifpackageloaded
– egreg
17 hours ago
@egreg Yes, becauseltx@ifpackageloadedis a simple macro. If it would be, e.g., robust, it could be better to useLetLtxMacrofrom packageletltxmacro. I didn't want to explain all this, so I've only noted about usingnewcommand*without arguments.
– Schweinebacke
17 hours ago
Thanks for the precisions
– lashoun
16 hours ago
add a comment |
4
4
4
As users Ulrike Fischer and moewe pointed out, this works:
documentclass{article}
usepackage[utf8]{inputenc}
usepackage{ltxcmds}
makeatletter
newcommand{IfPackageLoaded}[3]{ltx@ifpackageloaded{#1}{#2}{#3}}
makeatother
begin{document}
IfPackageLoaded{natbib}{natbib loaded}{natbib not loaded}
end{document}
edited 18 hours ago
Schweinebacke
22.5k4577
answered 18 hours ago
lashounlashoun
615
New contributor
lashoun is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
As users Ulrike Fischer and moewe pointed out, this works:
documentclass{article}
usepackage[utf8]{inputenc}
usepackage{ltxcmds}
makeatletter
newcommand{IfPackageLoaded}[3]{ltx@ifpackageloaded{#1}{#2}{#3}}
makeatother
begin{document}
IfPackageLoaded{natbib}{natbib loaded}{natbib not loaded}
end{document}
edited 18 hours ago
Schweinebacke
22.5k4577
answered 18 hours ago
lashounlashoun
615
New contributor
lashoun is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 18 hours ago
Schweinebacke
22.5k4577
edited 18 hours ago
Schweinebacke
22.5k4577
edited 18 hours ago
Schweinebacke
22.5k4577
22.5k4577
answered 18 hours ago
lashounlashoun
615
New contributor
lashoun is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered 18 hours ago
lashounlashoun
615
answered 18 hours ago
lashounlashoun
615
615
New contributor
lashoun is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
lashoun is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
lashoun is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
2
BTW: The[3]is not needed. You can simply usenewcommand*{IfPackageLoaded}{ltx@ifpackageloaded}.
– Schweinebacke
18 hours ago
@Schweinebacke RIght; alsoletIfPackageLoadedltx@ifpackageloaded
– egreg
17 hours ago
@egreg Yes, becauseltx@ifpackageloadedis a simple macro. If it would be, e.g., robust, it could be better to useLetLtxMacrofrom packageletltxmacro. I didn't want to explain all this, so I've only noted about usingnewcommand*without arguments.
– Schweinebacke
17 hours ago
Thanks for the precisions
– lashoun
16 hours ago
add a comment |
2
BTW: The[3]is not needed. You can simply usenewcommand*{IfPackageLoaded}{ltx@ifpackageloaded}.
– Schweinebacke
18 hours ago
@Schweinebacke RIght; alsoletIfPackageLoadedltx@ifpackageloaded
– egreg
17 hours ago
@egreg Yes, becauseltx@ifpackageloadedis a simple macro. If it would be, e.g., robust, it could be better to useLetLtxMacrofrom packageletltxmacro. I didn't want to explain all this, so I've only noted about usingnewcommand*without arguments.
– Schweinebacke
17 hours ago
Thanks for the precisions
– lashoun
16 hours ago
2
2
BTW: The
[3] is not needed. You can simply use newcommand*{IfPackageLoaded}{ltx@ifpackageloaded}.– Schweinebacke
18 hours ago
BTW: The
[3] is not needed. You can simply use newcommand*{IfPackageLoaded}{ltx@ifpackageloaded}.– Schweinebacke
18 hours ago
@Schweinebacke RIght; also
letIfPackageLoadedltx@ifpackageloaded– egreg
17 hours ago
@Schweinebacke RIght; also
letIfPackageLoadedltx@ifpackageloaded– egreg
17 hours ago
@egreg Yes, because
ltx@ifpackageloaded is a simple macro. If it would be, e.g., robust, it could be better to use LetLtxMacro from package letltxmacro. I didn't want to explain all this, so I've only noted about using newcommand* without arguments.– Schweinebacke
17 hours ago
@egreg Yes, because
ltx@ifpackageloaded is a simple macro. If it would be, e.g., robust, it could be better to use LetLtxMacro from package letltxmacro. I didn't want to explain all this, so I've only noted about using newcommand* without arguments.– Schweinebacke
17 hours ago
Thanks for the precisions
– lashoun
16 hours ago
Thanks for the precisions
– lashoun
16 hours ago
add a comment |
lashoun is a new contributor. Be nice, and check out our Code of Conduct.
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2
You are missing the
makeatletterin your second example. And don't use the minimal class, normally it is too minimal.– Ulrike Fischer
18 hours ago
Read more: tex.stackexchange.com/q/8351/156344
– JouleV
18 hours ago
It is said in the
ltxcmdsdocumentation thatltx@ifpackageloadedcan be used afterbegin{document}though.– lashoun
18 hours ago
But even then it can only be used if you wrap it in
makeatletter...makeatotherbecause it has an@in its name.– moewe
18 hours ago
Oooh, that's why! I'll try then.
– lashoun
18 hours ago