Shrinking Windows Horizontally

[Eric James Michael Ritz]

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Hello my fellow Emacs users.  Is there a command similar to
shrink-window-if-larger-than-buffer which will shrink horizontally
instead of vertically?  I often find myself bringing up a window that
I want to shrink horizontally as much as possible—usually a side-bar
with some information about some code I am working on.  Does anything
like this already exist in Emacs?  Or if not, any tips to point me in
a good direction for writing the command myself?

Thanks in advance for any help!

- --
Eric James Michael Ritz
Cyber Sprocket Labs

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