# C LuaSnip Snippets

local luasnip = require('luasnip')
local snip = luasnip.snippet
local text = luasnip.text_node
local insert = luasnip.insert_node
local func = luasnip.function_node
local key = require("luasnip.nodes.key_indexer").new_key

local function getIncludeGuardName()
  local filename = vim.fn.expand('%'):gsub('[^%w_]', '_'):upper()
  return filename .. '_INCLUDED'
end

local snippets = {
  snip('#include', {
    text('#include '),
    insert(1, '<', { key = 'open' }),
    insert(2, 'header'),
    func(function(args)
      if args[1][1] == '<' then
        return '>'
      else
        return '"'
      end
    end, key('open')),
  }),

  snip('once', {
    text('#ifndef '),
    func(function(args)
      return args[1][1]
    end, key('name')),
    text({ '', '#define ' }),
    insert(1, getIncludeGuardName(), { key = 'name' }),
    text({ '', '', '', }),
    insert(0, ''),
    text({ '', '', '#endif  // ' }),
    func(function(args)
      return args[1][1]
    end, key('name')),
  }),
}

return snippets