refactor/comamnds dont require .setup (#101)

* refactor(commands)!: change the way of disabling commands

BREAKING CHANGE: not it does not require calling .setup()

* docs: update docs

plugin/gopher.lua

@@ -0,0 +1,87 @@
+---@toc_entry Commands
+---@tag gopher.nvim-commands
+---@text
+--- If don't want to automatically register plugins' commands,
+--- you can set `vim.g.gopher_register_commands` to `false`, before loading the plugin.
+
+if vim.g.gopher_register_commands == false then
+  return
+end
+
+---@param name string
+---@param fn fun(args: table)
+---@param nargs? number|"*"|"?"
+---@private
+local function cmd(name, fn, nargs)
+  nargs = nargs or 0
+  vim.api.nvim_create_user_command(name, fn, { nargs = nargs })
+end
+
+cmd("GopherLog", function()
+  vim.cmd("tabnew " .. require("gopher._utils.log").get_outfile())
+end)
+
+cmd("GoIfErr", function()
+  require("gopher").iferr()
+end)
+
+cmd("GoCmt", function()
+  require("gopher").comment()
+end)
+
+cmd("GoImpl", function(args)
+  require("gopher").impl(unpack(args.fargs))
+end, "*")
+
+-- :GoInstall
+cmd("GoInstallDeps", function()
+  require("gopher").install_deps()
+end)
+
+cmd("GoInstallDepsSync", function()
+  require("gopher").install_deps { sync = true }
+end)
+
+-- :GoTag
+cmd("GoTagAdd", function(opts)
+  require("gopher").tags.add(unpack(opts.fargs))
+end, "*")
+
+cmd("GoTagRm", function(opts)
+  require("gopher").tags.rm(unpack(opts.fargs))
+end, "*")
+
+cmd("GoTagClear", function()
+  require("gopher").tags.clear()
+end)
+
+-- :GoTest
+cmd("GoTestAdd", function()
+  require("gopher").test.add()
+end)
+
+cmd("GoTestsAll", function()
+  require("gopher").test.all()
+end)
+
+cmd("GoTestsExp", function()
+  require("gopher").test.exported()
+end)
+
+-- :Go
+cmd("GoMod", function(opts)
+  require("gopher").mod(opts.fargs)
+end, "*")
+
+cmd("GoGet", function(opts)
+  vim.print(opts)
+  require("gopher").get(opts.fargs)
+end, "*")
+
+cmd("GoWork", function(opts)
+  require("gopher").get(opts.fargs)
+end, "*")
+
+cmd("GoGenerate", function(opts)
+  require("gopher").generate(opts.fargs or "")
+end, "?")