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" Add a header to a mail message
function! mail#AddHeaderField(name, body) abort
let l:num = 0
while l:num < line('$') && getline(l:num + 1) !=# ''
let l:num += 1
endwhile
call append(l:num, a:name.': '.a:body)
endfunction
" Add a set of headers to a mail message
function! mail#AddHeaderFields(fields) abort
for l:name in sort(keys(a:fields))
call mail#AddHeaderField(l:name, a:fields[l:name])
endfor
endfunction
" Flag a message as important
function! mail#FlagImportant() abort
call mail#AddHeaderFields({
\ 'Importance': 'High',
\ 'X-Priority': 1
\ })
endfunction
" Flag a message as unimportant
function! mail#FlagUnimportant() abort
call mail#AddHeaderFields({
\ 'Importance': 'Low',
\ 'X-Priority': 5
\ })
endfunction
" Move through quoted paragraphs like normal-mode `{` and `}`
function! mail#NewBlank(count, up, visual) abort
" Reselect visual selection
if a:visual
normal! gv
endif
" Flag for whether we've started a block
let l:block = 0
" Flag for the number of blocks passed
let l:blocks = 0
" Iterate through buffer lines
let l:num = line('.')
while a:up ? l:num > 1 : l:num < line('$')
" If the line is blank
if getline(l:num) =~# '^[ >]*$'
" If we'd moved through a non-blank block already, reset that flag and
" bump up the block count
if l:block
let l:block = 0
let l:blocks += 1
endif
" If we've hit the number of blocks, end the loop
if l:blocks == a:count
break
endif
" If the line is not blank, flag that we're going through a block
else
let l:block = 1
endif
" Move the line number or up or down depending on direction
let l:num += a:up ? -1 : 1
endwhile
" Move to line if nonzero and not equal to the current line
if l:num != line('.')
execute 'normal '.l:num.'G'
endif
endfunction
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