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