feat(git): add :Git fetch command

bundle/git.vim/lua/git/command/fetch.lua

@@ -0,0 +1,45 @@
+--=============================================================================
+-- fetch.lua --- :Git fetch
+-- Copyright (c) 2016-2022 Wang Shidong & Contributors
+-- Author: Wang Shidong < wsdjeg@outlook.com >
+-- URL: https://spacevim.org
+-- License: GPLv3
+--=============================================================================
+
+local m = {}
+
+local job = require('spacevim.api.job')
+local nt = require('spacevim.api.notify')
+local log = require('git.log')
+local stddata = {}
+
+local function on_exit(id, code, single)
+  log.debug('git-fetch exit code:' .. code .. ' single:' .. single)
+  if code == 0 and single == 0 then
+    nt.notify('fetch done!')
+  else
+    nt.notify(table.concat(stddata, '\n'), 'warningmsg')
+  end
+end
+
+local function on_std(id, data)
+  for _, v in ipairs(data) do
+    table.insert(stddata, v)
+  end
+end
+
+function m.run(argv)
+  local cmd = { 'git', 'fetch' }
+  for _, v in ipairs(argv) do
+    table.insert(cmd, v)
+  end
+  log.debug('git-fetch cmd:' .. vim.inspect(cmd))
+  stddata = {}
+  job.start(cmd, {
+    on_exit = on_exit,
+    on_stdout = on_std,
+    on_stderr = on_std
+  })
+end
+
+return m