Custom file labels / Inherit line highlight in icon decorator

[lrockreal]

I'm trying to replace nvim-tree's folder arrows with slashes like below:

However I want the slashes to inherit the line's highlight colors. I've tried doing it the hacky way and hijacking the Builder to no avail. I know that the root folder lets you add labels; this could also be solved using something like that for files, however I don't know of any features that exist that let you do that.

Here's my decorator. Ignore the disorganization, there have been many revisions as I've went through failed attempts to do this:

local UserDecorator = require("nvim-tree.api").decorator.UserDecorator

local FolderSlashDecorator = UserDecorator:extend()

function FolderSlashDecorator:new()
    self.enabled = true
    self.highlight_range = "none"
    self.icon_placement = "after"

    self.icon_open = { str = "/", hl = {} }
    self.icon_closed = { str = "/...", hl = {} }
end

function FolderSlashDecorator:icons(node)
    if node.type == "directory" then
        local str
        if node.open then
            str = self.icon_open.str
        else
            str = self.icon_closed.str
        end
        return { { str = str, hl = "NvimTreeOpenedHL" } }
    end
end

-- function FolderSlashDecorator:icon_node(node)
--     if node.type == "directory" then
--         return self.icon_open
--     end
-- end

return FolderSlashDecorator

Any suggestions?

[alex-courtis]

It looks like you're missing the array around hl i.e.

 return { { str = str, hl = { "NvimTreeOpenedHL" } } }

Tested concept with bookmarks, no code changes needed:

require("nvim-tree").setup({
  renderer = {
    highlight_bookmarks = "all",
    icons = {
      bookmarks_placement = "after",
      glyphs = {
        bookmark = "/...",
      },
    },
  },
})

vim.cmd([[
:hi link NvimTreeBookmarkIcon NvimTreeBookmarkHL
]])