Add option to show git ignored files with indicator

[cseickel]

One more idea (let me know if it is better to open a new issue):
For the gitignored files, how about adding an option to show them with a symbol like [I], or hide them directly?
E.g.,

require("neo-tree").setup({
	filesystem = {
		filters = {
			respect_gitignore = true,
			gitignore_treatmente = 'symbol'	-- can be 'hidden' or 'symbol'
		}
	}
})

For the symbols, nvim-tree uses symbols for different status of files

I think this is a good addition to neo-tree

Originally posted by @yanzhang0219 in #147 (comment)

[cseickel]

I think this is a good idea @yanzhang0219, I personally like to show any "hidden" files in a different highlight group as well. I'll add both options.

[cseickel]

Anyone interested in this feature, please see the discussion at: #171

[cseickel]

This has been partially implemented in a new v2.x branch. The way it works now, if you show hidden files, git ignored files will be marked with it's own highlight group (grey) and use the [!!] marker. I'll also update or add a new component that can replace these codes with symbols in a future update.

v2.x has breaking changes to the filters config. These options have been completely changed:

    require("neo-tree").setup({
      filesystem = {
        filtered_items = {
          visible = false, -- when true, they will just be displayed differently than normal items
          hide_dotfiles = true,
          hide_gitignored = true,
          hide_by_name = {
            ".DS_Store",
            "thumbs.db"
            --"node_modules"
          },
          never_show = { -- remains hidden even if visible is toggled to true
            --".DS_Store",
            --"thumbs.db"
          },
        },
      }
    })

WARNING: v2.x is brand new and far from release. It will have many breaking changes, although I will alert you to these changes and try to auto migrate your existing config options.

[cseickel]

I've added my own set of symbols that I like better:

This will be merged to 2.x soon, I''m not sure when 2,x will be released. Let me know if you have any feedback.

[nyngwang]

I want this cool feature AS SOON AS POSSIBLE. (by a main branch user)

Update: I just migrated to the v2.x-branch and using this feature!