spacevim/bundle/vim-go/autoload/go/promise.vim
JIe 2bb7059579
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init
2024-08-21 14:17:26 +08:00

59 lines
1.6 KiB
VimL

" don't spam the user when Vim is started in Vi compatibility mode
let s:cpo_save = &cpo
set cpo&vim
scriptencoding utf-8
" New returns a promise. A promise's primary purpose is to make async jobs
" synchronous by awaiting fn.
"
" A promise is a dictionary with two keys:
" 'wrapper':
" A function that wraps fn. It can be used in place of fn.
" 'await':
" A function that waits for wrapper to be called and returns the value
" returned by fn. Returns default if timeout expires.
function! go#promise#New(fn, timeout, default) abort
let l:state = {}
" explicitly bind to state so that within l:promise's methods, self will
" always refer to state. See :help Partial for more information.
return {
\ 'wrapper': function('s:wrapper', [a:fn, a:default], l:state),
\ 'await': function('s:await', [a:timeout, a:default], l:state),
\ }
endfunction
function! s:wrapper(fn, default, ...) dict
try
let self.retval = call(a:fn, a:000)
catch
let self.retval = substitute(v:exception, '^Vim', '', '')
let self.exception = 1
endtry
return self.retval
endfunction
function! s:await(timeout, default) dict
let l:timer = timer_start(a:timeout, function('s:setretval', [a:default], self))
while !has_key(self, 'retval')
sleep 50m
endwhile
call timer_stop(l:timer)
if get(self, 'exception', 0)
throw self.retval
endif
return self.retval
endfunction
function! s:setretval(val, timer) dict
let self.retval = a:val
endfunction
" restore Vi compatibility settings
let &cpo = s:cpo_save
unlet s:cpo_save
" vim: sw=2 ts=2 et