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" Parse a mail header into a list of dictionaries with 'name' and 'body' keys;
" preserve case of the name and whitespace in body, including leading space
"
function! mail#header#Read() abort
let fields = []
for lnum in range(1, line('$'))
let line = getline(lnum)
let matchlist = matchlist(
\ line,
\ '^\([a-zA-Z0-9-]\+\):\s*\(\_.*\)',
\)
if !empty(matchlist)
let field = {
\ 'name': matchlist[1],
\ 'body': matchlist[2],
\}
call add(fields, field)
elseif line =~ '^\s' && exists('field')
let field['body'] .= "\n" . line
elseif line ==# ''
break
else
throw 'Parse error'
endif
endfor
let header = {
\'fields': fields,
\}
return header
endfunction
" Flatten a header data structure into a string
function! mail#header#String(header) abort
let fields = copy(a:header['fields'])
return join(
\ map(
\ copy(a:header['fields']),
\ 'v:val[''name''] . '': '' . v:val[''body''] . "\n"'),
\ '',
\)
endfunction
" Replace existing mail header with the provided one
function! mail#header#Write(header) abort
let start = 1
for lnum in range(1, line('$'))
if getline(lnum) ==# ''
break
endif
let end = lnum
endfor
let curpos = getpos('.')
if exists('end')
let range = join([start, end], ',')
execute join(['silent', range, 'delete'])
endif
silent 0 put =mail#header#String(a:header)
call setpos('.', curpos)
endfunction
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