Thanks, that's exactly what I needed.
I got inspired by your post at
https://adityam.github.io/context-blog/post/frame-with-solid-left-line/ for my
original code.
I just added linecap:=butt; at the beginning of the metapost code to get
squared ends.
Gilles
> Framed does not provide enough hooks to control the spaces. For something
> like this, you can also use metapost to draw the background:
>
> \showframe
> \showboxes
> \defineframedtext[leftbartext][
> width=broad,
> frame=off,
> rulethickness=.5ex,
> background=mp:offsetframe,
> offset=overlay,
> ]
>
> \defineoverlay[mp:offsetframe][\useMPgraphic{mp:offsetframe}]
>
\startuseMPgraphic{mp:offsetframe}
linecap:=butt;
draw leftboundary OverlayBox
xshifted -(LeftMarginDistance + 0.5OverlayLineWidth)
withpen pencircle scaled OverlayLineWidth;
setbounds currentpicture to OverlayBox; \stopuseMPgraphic
>
> \starttext
> \startleftbartext
> \input knuth
> \stopleftbartext
> \stoptext
>
>
> Aditya
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