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A quick & dirty run-and-show-output-in-vsplit-window script for vim. Definitely not as refined as the xmp decorator, and it cannot expand test assertions automagically, but I'll give it a try in my .vimrc.

Some minor details to make it more palatable:

• works in insert, normal, visual mode, and DWIM
• doesn't overwrite the original file, doesn't use fixed tempfiles
• preserves the cursor position, and you're placed back in the source file
• most importantly: killing the new window is as easy as creating it in the first place (F7 to open, S-F7 to close), and it won't break the minibufexpl (which you should be using)

(hmm some aggregators can't show the following animation)

vimscript