-- Link the 'hiswikiLink' highlight group to the existing 'Underlined' group.
vim.api.nvim_set_hl(0, "hiswikiLink", { link = "Underlined" })

-- Remove all existing hiswikiLink syntax matches.
vim.cmd("syntax clear hiswikiLink")

-- Find the directory of the current file.
local base_dir = vim.fn.expand("%:h")

-- Loop through all files in the directory, and add a syntax match for each one.
for _, file in ipairs(vim.fn.readdir(base_dir)) do
  vim.cmd("syntax match hiswikiLink /\\c\\V\\<" .. vim.fn.escape(file, "/\\") .. "/")
end