We now require the output to accept UTF-8 and we can determine how wide
the terminal (if any) is, so here we begin to make use of that for the
"terraform plan" command.
The horizontal rule is now made of box drawing characters instead of
hyphens and fills the whole terminal width.
The paragraphs of text in the output are now also wrapped to fill the
terminal width, instead of the hard-wrapping we did before.
This is just a start down the road of making better use of the terminal
capabilities. Lots of other commands could benefit from updates like these
too.
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