在 Neovim 中运行异步 Lua 函数

Question

我试图让 Vim 在白天自动更改其主题，每 30 秒运行一次检查。我正在遵循本指南。不过，我想借助这个网站将他的 Vimscript 功能移植到 Lua 上。问题是，当我运行代码时，它在前台运行，这意味着在杀死它之前我无法执行任何操作。

这是 Vimscript 代码：

" Automatic light mode / dark mode switcher
function! ChangeColorScheme(channel, msg)
  let time = trim(a:msg)
  if time ==# "day"
    call LightMode()
  else
    call DarkMode()
  endif
endfunction

function! Sunshine(timer)
  if executable("sunshine")
    " Add your desired location here instead of '@45 15' (I probably could have
    " made it into a variable)
    let job = job_start(["sunshine", "-s", "@45 15"], {"out_cb": "ChangeColorScheme"})
  else
    call DarkMode()
  endif
endfunction

function! AutoDarkModeSetup()
  let timer = timer_start(30000, 'Sunshine', {'repeat': -1})
  call Sunshine(timer) " Initial call to setup the theme
endfunction

call AutoDarkModeSetup()

这是我的 Lua 代码：

-- Automatic light mode / dark mode switcher
local loop = vim.loop
local cmd = vim.cmd
local stat = require("posix.sys.stat")
local socket = require ("socket")
local gettime = socket.gettime

function LightMode()
    cmd [[colorscheme github]]
end

function DarkMode()
    cmd [[colorscheme dracula]]
end

function trim(s)
   return (s:gsub("^%s*(.-)%s*$", "%1"))
end

function ChangeColorScheme(msg)
  local time = trim(msg)
  if time == "day" then
    return LightMode()
  else
    return DarkMode()
  end
end

function Sunshine()
  if stat["/usr/local/bin/sunshine"] then
    job = loop.spawn('sunshine', {
            args = {'-s', '@36 30'},
            stdio = {nil,stdout,stderr}
        },
        vim.schedule_wrap(function()
          stdout:read_stop()
          stderr:read_stop()
          stdout:close()
          stderr:close()
          job:close()
          setQF()
        end
        )
        )
        loop.read_start(stdout, ChangeColorScheme)
        loop.read_start(stderr, ChangeColorScheme)
  else
    return DarkMode()
  end
end

function AutoDarkModeSetup()
  local function timer(seconds)
    local exp_time = gettime() + seconds
    return function()
       if gettime() < exp_time then return false end
       exp_time = exp_time + seconds
       return true
    end
  end

  local t1 = timer(30) -- a timer that expires every 30 seconds

  while true do
     if t1() then Sunshine() end
  end
end

AutoDarkModeSetup()

我通过简单地添加 require() 在 init.lua 中调用它。

如果我的问题太明显，我深表歉意，我以前从未用 Lua 编码过。

Answer 1

你可以timer像这样使用 vim.loop ：

local function time_background()
    local timer = vim.loop.new_timer()
    timer:start(0, 600, vim.schedule_wrap(function()
        local hour = tonumber(os.date('%H'))
        local bg = (hour > 6 and hour < 18) and 'light' or 'dark'
        if vim.o.bg ~= bg then vim.o.bg = bg end
    end))
end