fix: get diagnostics icons from config (#1826)

Author: igorlfs

lua/nvim-tree.lua

@@ -131,6 +131,17 @@ local function manage_netrw(disable_netrw, hijack_netrw)
   end
 end
 
+---@param severity vim.diagnostic.Severity
+---@return string?
+local function get_diagnostics_icons(severity)
+  local config = vim.diagnostic.config() or {}
+  local signs = config.signs or {}
+  if type(signs) == "function" then
+    signs = signs(0, 0)
+  end
+  return (type(signs) == "table" and signs.text and signs.text[severity]) or nil
+end
+
 ---@param name string|nil
 function M.change_dir(name)
   if name then
@@ -303,7 +314,7 @@ local DEFAULT_OPTS = { -- BEGIN_DEFAULT_OPTS
     special_files = { "Cargo.toml", "Makefile", "README.md", "readme.md" },
     hidden_display = "none",
     symlink_destination = true,
-    decorators = { "Git", "Open", "Hidden", "Modified", "Bookmark", "Diagnostics", "Copied", "Cut", },
+    decorators = { "Git", "Open", "Hidden", "Modified", "Bookmark", "Diagnostics", "Copied", "Cut" },
     highlight_git = "none",
     highlight_diagnostics = "none",
     highlight_opened_files = "none",
@@ -415,10 +426,10 @@ local DEFAULT_OPTS = { -- BEGIN_DEFAULT_OPTS
       max = vim.diagnostic.severity.ERROR,
     },
     icons = {
-      hint = "",
-      info = "",
-      warning = "",
-      error = "",
+      hint = get_diagnostics_icons(vim.diagnostic.severity.HINT) or "",
+      info = get_diagnostics_icons(vim.diagnostic.severity.INFO) or "",
+      warning = get_diagnostics_icons(vim.diagnostic.severity.WARN) or "",
+      error = get_diagnostics_icons(vim.diagnostic.severity.ERROR) or "",
     },
   },
   modified = {
@@ -513,8 +524,7 @@ local DEFAULT_OPTS = { -- BEGIN_DEFAULT_OPTS
       default_yes = false,
     },
   },
-  experimental = {
-  },
+  experimental = {},
   log = {
     enable = false,
     truncate = false,