Removing indent/newline before and after leftbar

Question

Im writing a summary of my lectures and encountered a problem.
I would like to insert a vertical left bar near the important theorems I have to know.
What I found so far is the following:
documentclass[a4paper,landscape]{report}
usepackage[a4paper,margin=0.5cm,landscape]{geometry}

usepackage{blindtext}
usepackage{framed}

renewenvironment{leftbar}{%
    nobreak
    defFrameCommand{{vrule width 1pt} hspace{3pt} }%
    MakeFramed {advancehsize-width FrameRestore}}%
{endMakeFramed}

begin{document}
    blindtext
    blindtext
    begin{leftbar}
    blindtext
    end{leftbar}
    blindtext
end{document}

I already set the thickness of the line to 1 px because it was too big for my liking.
Here an example: Just plain text
Becomes indented and makes a newline before and after the leftbar:

What should I do to remove the indents and the new lines?
Many thanks in advice for your answers!

campa · Accepted Answer

To remove the indentation at the start of the leftbar environment you need to add a noindent to the begin-code. (And an ignorespaces to protect against the space following }). For the indentation after the environment you can use the @endparenv kernel macro. The vertical spacing around the environment is controlled by the length OuterFrameSep, which you can redefine to zero (but leave it some ability to stretch).
documentclass{report}

usepackage{blindtext}
usepackage{framed}

renewenvironment{leftbar}{%
   OuterFrameSep=0ex plus .8ex
   defFrameCommand{{vrule width 1pt} hspace{3pt} }%
   MakeFramed {advancehsize-width FrameRestore}
   noindentignorespaces
  }{%
   endMakeFramed
   csname@endparenvendcsname
}

begin{document}

blindtext
begin{leftbar}
blindtext
end{leftbar}
Some text here to show no indentation.
begin{leftbar}
Other lorem ipsum stuff.
end{leftbar}

Here you emph{do} have an indentation because of the additional empty line.

end{document}

Careful with the spaces: right now
defFrameCommand{{vrule width 1pt} hspace{3pt} }

gives you an horizontal space of 3pt plus  two spaces: see
a{vrule width 1pt} hspace{3pt} bpar
a{vrule width 1pt}hspace{3pt} bpar
a{vrule width 1pt}hspace{3pt}b

I would get rid of the two spaces and increase the 3pt to something you like.

Removing indent/newline before and after leftbar

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