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Using titlesec and/or komascript how do I format all headings so the number is left aligned in the margin, the title to the right, with a horizontal rule underneath it all (from margin to text width edge).

What's left of my hair is about to come out :(

|                             |
| 3.1  Section Title          |
| -------------------------   |
|      Text width paragraph   |
|      Blah blah blah blah    |
|                             |

  >-<  >------------------<
   |                |
   `-- Margin       ` Text
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have you seen Theorem Name/Numbering in Margin or How can I align section titles and list environments in the left margin? you should be able to adapt it to include titlerule which will give you the horizontal line... – cmhughes Feb 14 '13 at 22:41
@cmhughes yes (and many more similar answers), but I haven't found anything that does left alignment and horizontal rule. I'm still working on it, just hoping a guru will through me a bone. – h0tw1r3 Feb 14 '13 at 22:46
up vote 7 down vote accepted

Here's one possibility using titlesec:





\section{A Test Section with a Short Title}
\section{A Test Section with a Long Title Spanning More than One Line}


enter image description here

Of course, you can adjust the value for \mylen to get the desired positioning for the numbers; for example, using


you get

enter image description here

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To understand your answer better, would you kindly elaborate how your solution works (except the rule part)? – blackened Sep 15 '15 at 17:33

Caveat: margin box size for number is not dynamic.

\titlespacing{\section}{-3em}{3.5ex plus 1ex minus .2ex}{2.3ex plus .2ex}
\chapter{Lorem Ipsem}
\section{Lorem Ipsum}
\section{Lorem Ipsum}
share|improve this answer
Also consider using \titlespacing*{...} if you wish to prevent the paragraph following the section from being indented. – davidg Dec 13 '13 at 5:22

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