typst-notes.nvim/snippets/typst.lua at main · pseudofractal/typst-notes.nvim · GitHub

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

local ts_utils = require("nvim-treesitter.ts_utils")
local fmt = require("luasnip.extras.fmt").fmt

-- Check if cursor is inside a math block/formula
local function inside_math_block()
  local node = ts_utils.get_node_at_cursor()
  while node do
    local type = node:type()
    if type == "math" or type == "formula" then
      return true
    end
    node = node:parent()
  end
  return false
end

-- Inverse of inside_math_block
local function not_inside_math_block()
  return not inside_math_block()
end

return {
  -- Inline Math Trigger (mk), only outside math
  s({
    trig = "mk",
    snippetType = "autosnippet",
    wordTrig = true,
    condition = not_inside_math_block,
  }, {
    t("$"),
    i(1),
    t("$"),
  }),

  -- Block Math Trigger (dm), only outside math
  s(
    {
      trig = "dm",
      wordTrig = true,
      snippetType = "autosnippet",
      condition = not_inside_math_block,
    },
    fmt(
      [[
$
{}
$
{}
]],
      {
        i(1),
        i(0),
      }
    )
  ),

  -- Superscript (^), only inside math
  s({
    trig = "^",
    wordTrig = true,
    snippetType = "autosnippet",
    condition = inside_math_block,
  }, {
    t("^("),
    i(1),
    t(")"),
    i(0),
  }),

  -- Subscript (_), only inside math
  s({
    trig = "_",
    wordTrig = true,
    snippetType = "autosnippet",
    condition = inside_math_block,
  }, {
    t("_("),
    i(1),
    t(")"),
    i(0),
  }),

  -- Fraction  a/ → (a)/(•)
  s({
    trig = "([^%s]+)/",
    regTrig = true,
    wordTrig = false,
    snippetType = "autosnippet",
    condition = inside_math_block,
  }, {
    t("("),
    f(function(_, snip)
      return snip.captures[1]
    end),
    t(")/("),
    i(1),
    t(")"),
    i(0),
  }),

  -- Differential (dd), only inside math { Requires Physica package }
  s({
    trig = "dd",
    wordTrig = true,
    snippetType = "autosnippet",
    condition = inside_math_block,
  }, {
    t("dd("),
    i(1),
    t(")"),
    i(0),
  }),

  -- <anything-non-space> .. <anything-non-space>
  s({
    trig = "(%S+)%s*%.%.%s*(%S+)",
    regTrig = true,
    wordTrig = false,
    snippetType = "autosnippet",
  }, {
    f(function(_, snip)
      return snip.captures[1]
    end),
    t("("),
    f(function(_, snip)
      return snip.captures[2]
    end),
    i(1),
    t(")"),
    i(0),
  }),

  -- Aligned Equal (==), only inside math
  s({
    trig = "==",
    snippetType = "autosnippet",
    wordTrig = true,
    condition = inside_math_block,
  }, {
    t("&="),
    i(0),
  }),

  -- Lagrangian (lll), only inside math
  s({
    trig = "lll",
    snippetType = "autosnippet",
    wordTrig = true,
    condition = inside_math_block,
  }, {
    t("cal(L)"),
    i(0),
  }),

  -- Vector Arrow (vv), only inside math
  s({
    trig = "vv",
    snippetType = "autosnippet",
    wordTrig = true,
    condition = inside_math_block,
  }, {
    t("va("),
    i(1),
    t(")"),
    i(0),
  }),
}