How can I determine whether a custom environment is followed by a new paragraph?

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I'm writing a custom command that uses minipages to display its contents:

newcommandexample[1]noindentbeginminipagelinewidth#1endminipage

The spacing around this command should be similar to that of the align environment: abovedisplayskip above, and belowdisplayskip after, so I add parvspace… before and after:

newcommandexample[1]%
 parvspaceabovedisplayskip
 noindentbeginminipagelinewidth#1endminipage
 paraddvspacebelowdisplayskip

This isn't perfect, though: it adds an extra parskip before and after the contents, even if there are no blank lines around the command:

AAA % too much space (extra parskip) after this
examplelipsum[1]
BBB % too much space (extra parskip) before that

I can remove the first one by changing the definition to this:

newcommandexample[1]%
 ifvmodeelseparvspace-parskipfivspaceabovedisplayskip
 noindentbeginminipagelinewidth#1endminipage
 paraddvspacebelowdisplayskip

But what's the equivalent fix for the bottom of the command? If I use a negative space the parskip will always be suppressed. Ideally, I'd like text immediately following the command to not be indented, just like with [].

Here's a minimal example:

documentclassminimal

usepackagelipsum
setlengthparskip50pt

newcommandexample[1]%
 ifvmodeelseparvspace-parskipfivspaceabovedisplayskip
 noindentbeginminipagelinewidth#1endminipage
 paraddvspacebelowdisplayskip

begindocument

% There should be small spaces after AAA and before BBB
AAA
examplelipsum[1]
BBB

% There should be a large space after AAA and a small one before BBB
% And BBB shouldn't be indented
AAA

examplelipsum[1]
BBB

% There should be a small space after AAA and a large one before BBB
AAA
examplelipsum[1]

BBB
enddocument 

spacing

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asked 4 hours ago

Clément

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up vote
5
down vote

favorite

I'm writing a custom command that uses minipages to display its contents:

newcommandexample[1]noindentbeginminipagelinewidth#1endminipage

The spacing around this command should be similar to that of the align environment: abovedisplayskip above, and belowdisplayskip after, so I add parvspace… before and after:

newcommandexample[1]%
 parvspaceabovedisplayskip
 noindentbeginminipagelinewidth#1endminipage
 paraddvspacebelowdisplayskip

This isn't perfect, though: it adds an extra parskip before and after the contents, even if there are no blank lines around the command:

AAA % too much space (extra parskip) after this
examplelipsum[1]
BBB % too much space (extra parskip) before that

I can remove the first one by changing the definition to this:

newcommandexample[1]%
 ifvmodeelseparvspace-parskipfivspaceabovedisplayskip
 noindentbeginminipagelinewidth#1endminipage
 paraddvspacebelowdisplayskip

But what's the equivalent fix for the bottom of the command? If I use a negative space the parskip will always be suppressed. Ideally, I'd like text immediately following the command to not be indented, just like with [].

Here's a minimal example:

documentclassminimal

usepackagelipsum
setlengthparskip50pt

newcommandexample[1]%
 ifvmodeelseparvspace-parskipfivspaceabovedisplayskip
 noindentbeginminipagelinewidth#1endminipage
 paraddvspacebelowdisplayskip

begindocument

% There should be small spaces after AAA and before BBB
AAA
examplelipsum[1]
BBB

% There should be a large space after AAA and a small one before BBB
% And BBB shouldn't be indented
AAA

examplelipsum[1]
BBB

% There should be a small space after AAA and a large one before BBB
AAA
examplelipsum[1]

BBB
enddocument 

spacing

share|improve this question

asked 4 hours ago

Clément

1,6861529

add a comment | 

up vote
5
down vote

favorite

up vote
5
down vote

favorite

I'm writing a custom command that uses minipages to display its contents:

newcommandexample[1]noindentbeginminipagelinewidth#1endminipage

The spacing around this command should be similar to that of the align environment: abovedisplayskip above, and belowdisplayskip after, so I add parvspace… before and after:

newcommandexample[1]%
 parvspaceabovedisplayskip
 noindentbeginminipagelinewidth#1endminipage
 paraddvspacebelowdisplayskip

This isn't perfect, though: it adds an extra parskip before and after the contents, even if there are no blank lines around the command:

AAA % too much space (extra parskip) after this
examplelipsum[1]
BBB % too much space (extra parskip) before that

I can remove the first one by changing the definition to this:

newcommandexample[1]%
 ifvmodeelseparvspace-parskipfivspaceabovedisplayskip
 noindentbeginminipagelinewidth#1endminipage
 paraddvspacebelowdisplayskip

But what's the equivalent fix for the bottom of the command? If I use a negative space the parskip will always be suppressed. Ideally, I'd like text immediately following the command to not be indented, just like with [].

Here's a minimal example:

documentclassminimal

usepackagelipsum
setlengthparskip50pt

newcommandexample[1]%
 ifvmodeelseparvspace-parskipfivspaceabovedisplayskip
 noindentbeginminipagelinewidth#1endminipage
 paraddvspacebelowdisplayskip

begindocument

% There should be small spaces after AAA and before BBB
AAA
examplelipsum[1]
BBB

% There should be a large space after AAA and a small one before BBB
% And BBB shouldn't be indented
AAA

examplelipsum[1]
BBB

% There should be a small space after AAA and a large one before BBB
AAA
examplelipsum[1]

BBB
enddocument 

spacing

share|improve this question

asked 4 hours ago

Clément

1,6861529

I'm writing a custom command that uses minipages to display its contents:

newcommandexample[1]noindentbeginminipagelinewidth#1endminipage

The spacing around this command should be similar to that of the align environment: abovedisplayskip above, and belowdisplayskip after, so I add parvspace… before and after:

newcommandexample[1]%
 parvspaceabovedisplayskip
 noindentbeginminipagelinewidth#1endminipage
 paraddvspacebelowdisplayskip

This isn't perfect, though: it adds an extra parskip before and after the contents, even if there are no blank lines around the command:

AAA % too much space (extra parskip) after this
examplelipsum[1]
BBB % too much space (extra parskip) before that

I can remove the first one by changing the definition to this:

newcommandexample[1]%
 ifvmodeelseparvspace-parskipfivspaceabovedisplayskip
 noindentbeginminipagelinewidth#1endminipage
 paraddvspacebelowdisplayskip

But what's the equivalent fix for the bottom of the command? If I use a negative space the parskip will always be suppressed. Ideally, I'd like text immediately following the command to not be indented, just like with [].

Here's a minimal example:

documentclassminimal

usepackagelipsum
setlengthparskip50pt

newcommandexample[1]%
 ifvmodeelseparvspace-parskipfivspaceabovedisplayskip
 noindentbeginminipagelinewidth#1endminipage
 paraddvspacebelowdisplayskip

begindocument

% There should be small spaces after AAA and before BBB
AAA
examplelipsum[1]
BBB

% There should be a large space after AAA and a small one before BBB
% And BBB shouldn't be indented
AAA

examplelipsum[1]
BBB

% There should be a small space after AAA and a large one before BBB
AAA
examplelipsum[1]

BBB
enddocument 

spacing

spacing

share|improve this question

asked 4 hours ago

Clément

1,6861529

share|improve this question

asked 4 hours ago

Clément

1,6861529

share|improve this question

share|improve this question

asked 4 hours ago

Clément

1,6861529

asked 4 hours ago

Clément

1,6861529

asked 4 hours ago

Clément

1,6861529

1,6861529

add a comment | 

add a comment | 

2 Answers
2

active

oldest

votes

up vote
2
down vote

The standard way to do this would be to define your environment as a trivlist, almost all latex display environments (verbatim, center, quote,..) are defined as trivlists (special one-item version of list) exactly for this reason.

The trivlist code detects whether there is a paragraph break before the list and if so has paragraph spacing before and after, but if there is no paragraph break before the list then the internal par after the list is hidden and paragraph indentation of the following text is suppressed.

begincenterendcenter for example is defined by

defcentertrivlist centeringitemrelax
defendcenterendtrivlist

share|improve this answer

answered 3 hours ago

David Carlisle

474k3811031837

add a comment | 

up vote
0
down vote

Here is a possible solution.
I'm defining the macro tentativepar which inserts par and sets both parskip and parindent to 0pt.
It moreover temporarily redefines par and everypar (which is inserted at the start of every paragraph) to reset the original values.

The net effect is that tentativepar will insert a paragraph break without any skip or indentation unless it is followed by another par.

Here is an example:

documentclassarticle

setlengthparskip50pt

%% vv We need to store a couple of values
newskipsavedparskip
newskipsavedparindent
newtokssavedeverypar

makeatletter
newcommand*tentativepar%
 par
 savedparskipparskip %% <- store original parskip
 savedparindentparindent %% <- store original parindent
 expandaftersavedeveryparexpandaftertheeverypar
 %% ^^ store original everypar
 parskip0pt %% <- set parskip to 0pt
 parindent0pt %% <- set parindent to 0pt
 %% vv restore everything that was saved after the first par
 defpar%
 @restorepar %% <- restore original par
 expandaftereveryparexpandafterthesavedeverypar%
 parskipsavedparskip %% <- reset parskip
 parindentsavedparindent %% <- reset parindent
 par %% still insert a paragraph break
 %
 %% vv or at the stat of the next paragraph
 expandaftereveryparexpandafter%
 thesavedeverypar
 @restorepar %% <- restore original par
 expandaftereveryparexpandafterthesavedeverypar%
 parskipsavedparskip %% <- reset parskip
 parindentsavedparindent %% <- reset parindent
 

makeatother

newcommandexample[1]%
 ifvmodeelsetentativeparfi
 vspaceabovedisplayskip
 noindentbeginminipage.5linewidth#1endminipage%
 vspacebelowdisplayskip
 tentativepar


begindocument

AAA
exampleThere should be small spaces after AAA and before BBB
BBB

AAA

exampleThere should be a large space after AAA and a small one before BBB. And BBB shouldn't be indented.
BBB

AAA
exampleThere should be a small space after AAA and a large one before BBB

BBB

CCC

enddocument

share

answered 7 mins ago

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2 Answers
2

active

oldest

votes

2 Answers
2

active

oldest

votes

active

oldest

votes

active

oldest

votes

up vote
2
down vote

The standard way to do this would be to define your environment as a trivlist, almost all latex display environments (verbatim, center, quote,..) are defined as trivlists (special one-item version of list) exactly for this reason.

The trivlist code detects whether there is a paragraph break before the list and if so has paragraph spacing before and after, but if there is no paragraph break before the list then the internal par after the list is hidden and paragraph indentation of the following text is suppressed.

begincenterendcenter for example is defined by

defcentertrivlist centeringitemrelax
defendcenterendtrivlist

share|improve this answer

answered 3 hours ago

David Carlisle

474k3811031837

add a comment | 

up vote
2
down vote

The standard way to do this would be to define your environment as a trivlist, almost all latex display environments (verbatim, center, quote,..) are defined as trivlists (special one-item version of list) exactly for this reason.

The trivlist code detects whether there is a paragraph break before the list and if so has paragraph spacing before and after, but if there is no paragraph break before the list then the internal par after the list is hidden and paragraph indentation of the following text is suppressed.

begincenterendcenter for example is defined by

defcentertrivlist centeringitemrelax
defendcenterendtrivlist

share|improve this answer

answered 3 hours ago

David Carlisle

474k3811031837

add a comment | 

up vote
2
down vote

up vote
2
down vote

The standard way to do this would be to define your environment as a trivlist, almost all latex display environments (verbatim, center, quote,..) are defined as trivlists (special one-item version of list) exactly for this reason.

The trivlist code detects whether there is a paragraph break before the list and if so has paragraph spacing before and after, but if there is no paragraph break before the list then the internal par after the list is hidden and paragraph indentation of the following text is suppressed.

begincenterendcenter for example is defined by

defcentertrivlist centeringitemrelax
defendcenterendtrivlist

share|improve this answer

answered 3 hours ago

David Carlisle

474k3811031837

The standard way to do this would be to define your environment as a trivlist, almost all latex display environments (verbatim, center, quote,..) are defined as trivlists (special one-item version of list) exactly for this reason.

The trivlist code detects whether there is a paragraph break before the list and if so has paragraph spacing before and after, but if there is no paragraph break before the list then the internal par after the list is hidden and paragraph indentation of the following text is suppressed.

begincenterendcenter for example is defined by

defcentertrivlist centeringitemrelax
defendcenterendtrivlist

share|improve this answer

answered 3 hours ago

David Carlisle

474k3811031837

share|improve this answer

share|improve this answer

answered 3 hours ago

David Carlisle

474k3811031837

answered 3 hours ago

David Carlisle

474k3811031837

answered 3 hours ago

David Carlisle

474k3811031837

474k3811031837

add a comment | 

add a comment | 

up vote
0
down vote

Here is a possible solution.
I'm defining the macro tentativepar which inserts par and sets both parskip and parindent to 0pt.
It moreover temporarily redefines par and everypar (which is inserted at the start of every paragraph) to reset the original values.

The net effect is that tentativepar will insert a paragraph break without any skip or indentation unless it is followed by another par.

Here is an example:

documentclassarticle

setlengthparskip50pt

%% vv We need to store a couple of values
newskipsavedparskip
newskipsavedparindent
newtokssavedeverypar

makeatletter
newcommand*tentativepar%
 par
 savedparskipparskip %% <- store original parskip
 savedparindentparindent %% <- store original parindent
 expandaftersavedeveryparexpandaftertheeverypar
 %% ^^ store original everypar
 parskip0pt %% <- set parskip to 0pt
 parindent0pt %% <- set parindent to 0pt
 %% vv restore everything that was saved after the first par
 defpar%
 @restorepar %% <- restore original par
 expandaftereveryparexpandafterthesavedeverypar%
 parskipsavedparskip %% <- reset parskip
 parindentsavedparindent %% <- reset parindent
 par %% still insert a paragraph break
 %
 %% vv or at the stat of the next paragraph
 expandaftereveryparexpandafter%
 thesavedeverypar
 @restorepar %% <- restore original par
 expandaftereveryparexpandafterthesavedeverypar%
 parskipsavedparskip %% <- reset parskip
 parindentsavedparindent %% <- reset parindent
 

makeatother

newcommandexample[1]%
 ifvmodeelsetentativeparfi
 vspaceabovedisplayskip
 noindentbeginminipage.5linewidth#1endminipage%
 vspacebelowdisplayskip
 tentativepar


begindocument

AAA
exampleThere should be small spaces after AAA and before BBB
BBB

AAA

exampleThere should be a large space after AAA and a small one before BBB. And BBB shouldn't be indented.
BBB

AAA
exampleThere should be a small space after AAA and a large one before BBB

BBB

CCC

enddocument

share

answered 7 mins ago

Circumscribe

2,268322

add a comment | 

up vote
0
down vote

Here is a possible solution.
I'm defining the macro tentativepar which inserts par and sets both parskip and parindent to 0pt.
It moreover temporarily redefines par and everypar (which is inserted at the start of every paragraph) to reset the original values.

The net effect is that tentativepar will insert a paragraph break without any skip or indentation unless it is followed by another par.

Here is an example:

documentclassarticle

setlengthparskip50pt

%% vv We need to store a couple of values
newskipsavedparskip
newskipsavedparindent
newtokssavedeverypar

makeatletter
newcommand*tentativepar%
 par
 savedparskipparskip %% <- store original parskip
 savedparindentparindent %% <- store original parindent
 expandaftersavedeveryparexpandaftertheeverypar
 %% ^^ store original everypar
 parskip0pt %% <- set parskip to 0pt
 parindent0pt %% <- set parindent to 0pt
 %% vv restore everything that was saved after the first par
 defpar%
 @restorepar %% <- restore original par
 expandaftereveryparexpandafterthesavedeverypar%
 parskipsavedparskip %% <- reset parskip
 parindentsavedparindent %% <- reset parindent
 par %% still insert a paragraph break
 %
 %% vv or at the stat of the next paragraph
 expandaftereveryparexpandafter%
 thesavedeverypar
 @restorepar %% <- restore original par
 expandaftereveryparexpandafterthesavedeverypar%
 parskipsavedparskip %% <- reset parskip
 parindentsavedparindent %% <- reset parindent
 

makeatother

newcommandexample[1]%
 ifvmodeelsetentativeparfi
 vspaceabovedisplayskip
 noindentbeginminipage.5linewidth#1endminipage%
 vspacebelowdisplayskip
 tentativepar


begindocument

AAA
exampleThere should be small spaces after AAA and before BBB
BBB

AAA

exampleThere should be a large space after AAA and a small one before BBB. And BBB shouldn't be indented.
BBB

AAA
exampleThere should be a small space after AAA and a large one before BBB

BBB

CCC

enddocument

share

answered 7 mins ago

Circumscribe

2,268322

add a comment | 

up vote
0
down vote

up vote
0
down vote

Here is a possible solution.
I'm defining the macro tentativepar which inserts par and sets both parskip and parindent to 0pt.
It moreover temporarily redefines par and everypar (which is inserted at the start of every paragraph) to reset the original values.

The net effect is that tentativepar will insert a paragraph break without any skip or indentation unless it is followed by another par.

Here is an example:

documentclassarticle

setlengthparskip50pt

%% vv We need to store a couple of values
newskipsavedparskip
newskipsavedparindent
newtokssavedeverypar

makeatletter
newcommand*tentativepar%
 par
 savedparskipparskip %% <- store original parskip
 savedparindentparindent %% <- store original parindent
 expandaftersavedeveryparexpandaftertheeverypar
 %% ^^ store original everypar
 parskip0pt %% <- set parskip to 0pt
 parindent0pt %% <- set parindent to 0pt
 %% vv restore everything that was saved after the first par
 defpar%
 @restorepar %% <- restore original par
 expandaftereveryparexpandafterthesavedeverypar%
 parskipsavedparskip %% <- reset parskip
 parindentsavedparindent %% <- reset parindent
 par %% still insert a paragraph break
 %
 %% vv or at the stat of the next paragraph
 expandaftereveryparexpandafter%
 thesavedeverypar
 @restorepar %% <- restore original par
 expandaftereveryparexpandafterthesavedeverypar%
 parskipsavedparskip %% <- reset parskip
 parindentsavedparindent %% <- reset parindent
 

makeatother

newcommandexample[1]%
 ifvmodeelsetentativeparfi
 vspaceabovedisplayskip
 noindentbeginminipage.5linewidth#1endminipage%
 vspacebelowdisplayskip
 tentativepar


begindocument

AAA
exampleThere should be small spaces after AAA and before BBB
BBB

AAA

exampleThere should be a large space after AAA and a small one before BBB. And BBB shouldn't be indented.
BBB

AAA
exampleThere should be a small space after AAA and a large one before BBB

BBB

CCC

enddocument

share

answered 7 mins ago

Circumscribe

2,268322

Here is a possible solution.
I'm defining the macro tentativepar which inserts par and sets both parskip and parindent to 0pt.
It moreover temporarily redefines par and everypar (which is inserted at the start of every paragraph) to reset the original values.

The net effect is that tentativepar will insert a paragraph break without any skip or indentation unless it is followed by another par.

Here is an example:

documentclassarticle

setlengthparskip50pt

%% vv We need to store a couple of values
newskipsavedparskip
newskipsavedparindent
newtokssavedeverypar

makeatletter
newcommand*tentativepar%
 par
 savedparskipparskip %% <- store original parskip
 savedparindentparindent %% <- store original parindent
 expandaftersavedeveryparexpandaftertheeverypar
 %% ^^ store original everypar
 parskip0pt %% <- set parskip to 0pt
 parindent0pt %% <- set parindent to 0pt
 %% vv restore everything that was saved after the first par
 defpar%
 @restorepar %% <- restore original par
 expandaftereveryparexpandafterthesavedeverypar%
 parskipsavedparskip %% <- reset parskip
 parindentsavedparindent %% <- reset parindent
 par %% still insert a paragraph break
 %
 %% vv or at the stat of the next paragraph
 expandaftereveryparexpandafter%
 thesavedeverypar
 @restorepar %% <- restore original par
 expandaftereveryparexpandafterthesavedeverypar%
 parskipsavedparskip %% <- reset parskip
 parindentsavedparindent %% <- reset parindent
 

makeatother

newcommandexample[1]%
 ifvmodeelsetentativeparfi
 vspaceabovedisplayskip
 noindentbeginminipage.5linewidth#1endminipage%
 vspacebelowdisplayskip
 tentativepar


begindocument

AAA
exampleThere should be small spaces after AAA and before BBB
BBB

AAA

exampleThere should be a large space after AAA and a small one before BBB. And BBB shouldn't be indented.
BBB

AAA
exampleThere should be a small space after AAA and a large one before BBB

BBB

CCC

enddocument

share

answered 7 mins ago

Circumscribe

2,268322

share

share

answered 7 mins ago

Circumscribe

2,268322

answered 7 mins ago

Circumscribe

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answered 7 mins ago

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