Cfrgtkky

Basically, I need to indent paragraphs after a subsection as shown here:

Basically, I need to indent the all the content after a subsection. I already have the proper formatting for the heading of the subsection as follows:

documentclass[12pt]{report}

usepackage{titlesec}    

titleformat{subsection}[block]{bfseriesitshapenormalsizehspace{2em}}{thesubsection}{1em}{}

begin{document}

end{document}

I found a solution here: Indenting a whole paragraph

However, the problem is that in order to apply the solution I will need to manually add code before and after each subsection.

Another solution here: Indent every subsubsection element

proposes using a new environment:

documentclass{article}

usepackage{changepage}



usepackage{lipsum} 

newenvironment{subs}

  {adjustwidth{3em}{0pt}}

  {endadjustwidth}

begin{document}

subsection{A subsection}





lipsum[2]



begin{subs}

subsubsection{One}



lipsum[3]



subsubsection{Two}



lipsum[4]



end{subs}

end{document}

However, this has the same problem: I would need to manually add begin...end of the environment for each subsection I have. Is there a better solution?

In the same spirit as your first quoted answer and using etoolbox's patchcmd you can assume that leftskip is not used dor anything else, the magic is :

patchcmd{subsection}{-3.25ex@plus -1ex @minus -.2ex}{3.25ex@plus -1ex @minus -.2exsetlength{leftskip}{0cm}}{}{}

patchcmd{subsection}{1.5ex @plus .2ex}{1.5ex @plus .2exsetlength{leftskip}{2cm}}{}{}

patchcmd{section}{-3.5ex @plus -1ex @minus -.2ex}{-3.5ex @plus -1ex @minus -.2exsetlength{leftskip}{0cm}}{}{}

which switches off the shift at the beginning of the section and subsection, and switches it on when entering into subsection. Here is a MWE, in the which I changed the page size to fit the example on two pages:

documentclass[12pt,a4paper]{report}

usepackage[utf8]{inputenc}

usepackage[T1]{fontenc}

usepackage{lmodern}

usepackage{etoolbox}

usepackage{lipsum}

usepackage[margin=25mm]{geometry}



makeatletter

patchcmd{section}{-3.5ex @plus -1ex @minus -.2ex}{-3.5ex @plus -1ex @minus -.2exsetlength{leftskip}{0cm}}{}{}

patchcmd{subsection}{-3.25ex@plus -1ex @minus -.2ex}{3.25ex@plus -1ex @minus -.2exsetlength{leftskip}{0cm}}{}{}

patchcmd{subsection}{1.5ex @plus .2ex}{1.5ex @plus .2exsetlength{leftskip}{2cm}}{}{}

makeatother

begin{document}

setcounter{chapter}{3}

section{Section Foo}

lipsum[1]

subsection{A subsection}label{s:first}

lipsum[2]

subsection{Another subsection}

lipsum[3-5]



section{Section Bar}

textbf{As seen in section ref{s:first}}

lipsum[5]

subsection{Test again}

lipsum[5]

end{document}

with the result:

Note 1: this works also with hyperref, provided you make the patch before loading it.

Note 2: This approach is likely not compatible with titlesec. It assumes that the sectioning commands (below chapter) are based on the standard @startsection command. This is not an issue as you can also patch in a similar way the format of the title for getting italic

Note 3: To determine the value of the second argument of patchcmd (which depends on the class and ptsize) you have to look at the content of the sectionng commands. For this purpose I use a custom command :

newcommand{mymeaning}[1]{{smallnoindent{bfseries string #1} = meaning #1parmedskip}}

based on the standard command meaning with some cosmetic, and do e.g. mymeaning{subsection} in the document.