neovim/my_snippets/markdown.lua

local ls = require("luasnip")
local s = ls.snippet
local t = ls.text_node
local i = ls.insert_node
local f = ls.function_node
local fmt = require("luasnip.extras.fmt").fmt

-- Function to get the datetime
--   with daylight saving time
--   according to the locale
local get_date = function()
  return os.date("%Y-%m-%dT%H:%M:%S%z")
end

-- Function to get an id based on the datetime 
local get_id = function()
  return os.date("%Y%m%d%H%M%S")
end

return {
  s(
    {
      trig = "datetime",
      name = "Datetime",
      dscr = "Insert datetime with locale daylight saving"
    },
    {
      f(get_date, {})
    }
  ),
  s(
    {
      trig = "id",
      Name = "ID",
      dscr = "Insert an id based on the datetime"
    },
    {
      f(get_id, {})
    }
  ),
  s(
    {
      trig = "yaml",
      name = "YAML frontmatter",
      dscr = "Insert a YAML frontmatter for markdown"
    },
    {
      t { "---", "title: " },
      i(1, "title"),
      t{ "", "date: " },
      f(get_date, {}),
      t{ "", "id: " },
      f(get_id, {}),
      t{ "","tags: [" },
      i(2, "tags"),
      t{ "]", "---", "" },
      i(0),
    }
  ),
  s(
    {
      trig="reflink",
      name = "Reference link",
      dscr="Insert a link with reference syntax",
      docstring = "[Link text][Reference]\n\n[Reference]: Link Target \"Title\"\n\nTab to jump to the next field to fill in. \"Reference\" is automatically repeated."
    },
    fmt(
      [[
        [{1}][{2}]

        [{2}]: {3} "{4}"
      ]],
      {
        i(1, "Link text"),
        i(2, "Reference"),
        i(3, "Link target"),
        i(4, "Title")
      },
      { repeat_duplicates = true }
    )
  )
}