VIM underlining a title

 

HOW TO MAKE A CAPTION?

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(instead of keep tapping '-' to reach the desired length,

 one easy(?) way to achieve the same as above:

 go to the line)

0v$gU        # caption to uppercase

yyp          # duplicate the line

v$r-         # replace the line

ESC

(if same length not care, simply

80i- {escape}