Remove obsolete func (#377)

- remove function: SynGroup, HasColorscheme and
  GetGitBranch
- rewrite Inside_git_repo in lua instead

lua/custom-autocmd.lua

@@ -206,14 +206,16 @@ api.nvim_create_autocmd({ "VimEnter", "DirChanged" }, {
   group = api.nvim_create_augroup("git_repo_check", { clear = true }),
   pattern = "*",
   desc = "check if we are inside Git repo",
-  command = "call utils#Inside_git_repo()",
+  callback = function()
+    utils.inside_git_repo()
+  end,
 })
 
 -- ref: https://vi.stackexchange.com/a/169/15292
 api.nvim_create_autocmd("BufReadPre", {
   group = api.nvim_create_augroup("large_file", { clear = true }),
   pattern = "*",
-  desc = "check if we are inside Git repo",
+  desc = "optimize for large file",
   callback = function(ev)
     local file_size_limit = 524288 -- 0.5MB
     local f = ev.file

lua/mappings.lua

@@ -143,9 +143,6 @@ keymap.set("x", "c", '"_c')
 -- Remove trailing whitespace characters
 keymap.set("n", "<leader><space>", "<cmd>StripTrailingWhitespace<cr>", { desc = "remove trailing space" })
 
--- check the syntax group of current cursor position
-keymap.set("n", "<leader>st", "<cmd>call utils#SynGroup()<cr>", { desc = "check syntax group" })
-
 -- Copy entire buffer.
 keymap.set("n", "<leader>y", "<cmd>%yank<cr>", { desc = "yank entire buffer" })
 

lua/utils.lua

@@ -79,4 +79,18 @@ function M.is_compatible_version(expected_version)
   return true
 end
 
+--- check if we are inside a git repo
+--- @return boolean
+function M.inside_git_repo()
+  local result = vim.system({ "git", "rev-parse", "--is-inside-work-tree" }, { text = true }):wait()
+  if result.code ~= 0 then
+    return false
+  end
+
+  -- Manually trigger a special user autocmd InGitRepo (used lazyloading.
+  vim.cmd([[doautocmd User InGitRepo]])
+
+  return true
+end
+
 return M