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" Add an underline under a heading
function! markdown#Heading(char) abort
" Get current position
let pos = getpos('.')
" Get heading text from current line
let heading = getline(pos[1])
" Build underline string by repeating character by the string length of the
" heading text
let underline = repeat(a:char, strlen(heading))
" Append the heading text to the buffer on a new line after the heading
call append(pos[1], underline)
" Move to the first column of the underline we just inserted
let pos[1] += 1
let pos[2] = 1
call setpos('.', pos)
endfunction
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