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" Let's try this heading-based fold method out (Tim Pope)
function! markdown#Fold() abort
let line = getline(v:lnum)
" Regular headers
let depth = match(line, '\(^#\+\)\@<=\( .*$\)\@=')
if depth > 0
return '>' . depth
endif
" Setext style headings
if line =~# '^.\+$'
let nextline = getline(v:lnum + 1)
if nextline =~# '^=\+$'
return '>1'
elseif nextline =~# '^-\+$'
return '>2'
endif
endif
return '='
endfunction
" Add an underline under a heading
function! markdown#Heading(char) abort
" Get current position
let pos = getpos('.')
" Get heading text from current line
let heading = getline(pos[1])
" Build underline string by repeating character by the string length of the
" heading text
"
let underline = repeat(a:char, strlen(heading))
" If the line after this one looks like it's already an underline, replace
" it; otherwise, create a new underline
"
if getline(pos[1] + 1) =~# '^[-=]\{2,}$'
call setline(pos[1] + 1, underline)
else
call append(pos[1], underline)
endif
" 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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