-- Author        : swytch
-- Created       : Friday Nov. 19, 2021 23:27:24 CET
-- License       : GPLv3
-- Description   : luasnip config file

local ls = require("luasnip")
-- some shorthands...
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 c = ls.choice_node
local d = ls.dynamic_node
local l = require("luasnip.extras").lambda
local r = require("luasnip.extras").rep
local p = require("luasnip.extras").partial
local m = require("luasnip.extras").match
local n = require("luasnip.extras").nonempty
local dl = require("luasnip.extras").dynamic_lambda
local fmt = require("luasnip.extras.fmt").fmt
local fmta = require("luasnip.extras.fmt").fmta
local types = require("luasnip.util.types")
local conds = require("luasnip.extras.expand_conditions")

-- Every unspecified option will be set to the default.
ls.config.set_config({
	history = true,
	-- Update more often, :h events for more info.
	updateevents = "TextChanged,TextChangedI",
	ext_opts = {
		[types.choiceNode] = {
			active = {
				virt_text = { { "●", "LuaSnipChoice" } },
			},
			inactive = {
				virt_text = { { "●", "LuaSnipInactive" } },
			},
		},
		[types.functionNode] = {
			active = {
				virt_text = { { "●", "LuaSnipFunction" } },
			},
			inactive = {
				virt_text = { { "●", "LuaSnipInactive" } },
			},
		},
		[types.insertNode] = {
			active = {
				virt_text = { { "●", "LuaSnipInsert" } },
			},
			inactive = {
				virt_text = { { "●", "LuaSnipInactive" } },
			},
		},
	},
	-- treesitter-hl has 100, use something higher (default is 200).
	ext_base_prio = 200,
	-- minimal increase in priority.
	ext_prio_increase = 1,
	enable_autosnippets = true,
})

-- Make sure to not pass an invalid command, as io.popen() may write over nvim-text.
local function bash(_, _, command)
	local file = io.popen(command, "r")
	local res = {}
	for line in file:lines() do
		table.insert(res, line)
	end
	return res
end

-- Returns a snippet_node wrapped around an insert_node whose initial
-- text value is set to the current date in the desired format.
local function date_input(fmt)
	local format = fmt or "%Y-%m-%d"
	return sn(nil, i(1, os.date(format)))
end

-- in a lua file: search lua-, then c-, then all-snippets.
ls.filetype_extend("lua", { "c" })
-- in a cpp file: search c-snippets, then all-snippets only (no cpp-snippets!!).
ls.filetype_set("cpp", { "c" })