-- Abbreviations used in this article and the LuaSnip docs
local ls = require("luasnip")
local s = ls.snippet
-- local sn = ls.snippet_node
-- local t = ls.text_node
local i = ls.insert_node
-- local f = ls.function_node
-- local d = ls.dynamic_node
-- local fmt = require("luasnip.extras.fmt").fmt
local fmta = require("luasnip.extras.fmt").fmta
local rep = require("luasnip.extras").rep
local line_begin = require("luasnip.extras.expand_conditions").line_begin
--
-- AutoSnippet function "as":
local function as(trigger, nodes, opts)
  opts = opts or {}
  -- Add snippetType = "autosnippet" to the first parameter
  if type(trigger) == "table" then
    trigger.snippetType = "autosnippet"
  else
    trigger = { trig = trigger, snippetType = "autosnippet" }
  end
  return s(trigger, nodes, opts)
end

return {
  as(
    "eq",
    fmta(
      [[
        \[
          <>
        \] 
      ]],
      { i(1) }
    ),
    { condition = line_begin }
  ),

  as(
    "\\[",
    fmta(
      [[
        \[
          <>
        \] 
      ]],
      { i(1) }
    ),
    { condition = line_begin }
  ),

  as(
    "beg",
    fmta(
      [[
        \begin{<>}
          <>
        \end{<>}
      ]],
      { i(1), i(2), rep(1) }
    ),
    { condition = line_begin }
  ),

  as(
    "als",
    fmta(
      [[
    \begin{align*}
      <>
    \end{align*}
  ]],
      { i(1) }
    ),
    { condition = line_begin }
  ),

  as(
    "ali",
    fmta(
      [[
    \begin{align}
      <>
    \end{align}
  ]],
      { i(1) }
    ),
    { condition = line_begin }
  ),
}