fix: don't populate git status when git unused

[w0ng]

Attempts to fix #453

On large git repos, git status related commands are very slow. Do not populate git status when not set in configuration.

in nvim config:

vim.g.nvim_tree_gitignore = 0
vim.g.nvim_tree_git_hl = 0
vim.g.nvim_tree_show_icons = {
  git = 0,
}

When cd'd into my huge git repo:

$ time git -C . status --porcelain=v1 --ignored=matching
git -C . status --porcelain=v1 --ignored=matching  6.12s user 39.51s system 737% cpu 5.513 total

Before fix

After fix

[kyazdani42]

wouldn't it be better to run use git every time we need it so users can change configuration options on the fly and reload?

[w0ng]

wouldn't it be better to run use git every time we need it so users can change configuration options on the fly and reload?

👍 SGTM. Fixed ab76632

[kyazdani42]

LGTM thanks !