refactor: commands runner (#42)

* feat(utils): first impl of own commands runner

* refactor(gotests): uses own runner instead of vendored

* refactor(utils): back to plenary.job

* refactor(gotests): use new runner, clean code

* fix(runner): now it returns output correctly

* refactor(iferr): use vim.system

i have tried to use _utils.runner, but i can't figure out how to make `< file.go` for the command

* refactor(impl): use new runner

* refactor(installer): use new runner

* refactor(struct_tags): use new runner

* refactor: commands such as :GoGet runs with new runner

* refactor: throw errors in more lua way, i think

* refactor(utils): notify now has title

* refactor: use more correct way of notifying

* refactor(runner): write error message on error

lua/gopher/_utils/runner/gocmd.lua

@@ -0,0 +1,53 @@
+local r = require "gopher._utils.runner"
+local c = require("gopher.config").commands
+local u = require "gopher._utils"
+local gocmd = {}
+
+---@param args string[]
+---@return string[]
+local function if_get(args)
+  for i, arg in ipairs(args) do
+    local m = string.match(arg, "^https://(.*)$") or string.match(arg, "^http://(.*)$") or arg
+    table.remove(args, i)
+    table.insert(args, i, m)
+  end
+  return args
+end
+
+---@param args unknown[]
+---@return string[]
+local function if_generate(args)
+  if #args == 1 and args[1] == "%" then
+    args[1] = vim.fn.expand "%"
+  end
+  return args
+end
+
+---@param subcmd string
+---@param args string[]
+---@return string[]|nil
+function gocmd.run(subcmd, args)
+  if #args == 0 then
+    error "please provice any arguments"
+  end
+
+  if subcmd == "get" then
+    args = if_get(args)
+  end
+
+  if subcmd == "generate" then
+    args = if_generate(args)
+  end
+
+  return r.sync(c.go, {
+    args = { subcmd, unpack(args) },
+    on_exit = function(data, status)
+      if status ~= 0 then
+        error("gocmd failed: " .. data)
+      end
+      u.notify(c.go .. " " .. subcmd .. " successful runned")
+    end,
+  })
+end
+
+return gocmd