-- nvim-treesitter
--- Interface to the AST-level parser generator 'tree-sitter', enabling operations on source code that intelligently understand the syntax.
--- Out of the box, grammer-aware code highlighting, indentation, etc. .
--- Base for a lot of other plugins that rely on these kinds of features.

--- TODO: Look into extensions for:
--- * Text Objects: https://github.com/nvim-treesitter/nvim-treesitter-textobjects
--- As always, consult <http://www.lazyvim.org/plugins/treesitter>

return {
	'nvim-treesitter/nvim-treesitter',
	commit = 'cfc6f2c117aaaa82f19bcce44deec2c194d900ab',

	dependencies = {
		{
			'nvim-treesitter/nvim-treesitter-textobjects',
			commit = 'ad8f0a472148c3e0ae9851e26a722ee4e29b1595',
		},
	},

	build = ':TSUpdate all',  -- Update lang parsers unconditionally on build

	lazy = vim.fn.argc(-1) == 0, -- Load early only when opening file w/cmdline
	event = {
		'VeryLazy',
	},
	cmd = {
		"TSUpdateSync",
		"TSUpdate",
		"TSInstall",
	},
	init = function(plugin)
		--- Many plugins apparently no longer require("nvim-treesitter").
		--- This messes with the lazy-loading logic.
		--- However, such plugins only otherwise use custom queries (seems to be called "RTP").
		--- We therefore register treesitter w/RTP, so such queries will load treesitter.
		require("lazy.core.loader").add_to_rtp(plugin)
		require("nvim-treesitter.query_predicates")
	end,

	opts = {
		-- Grammer-Aware Syntax Highlighting
		highlight = {
			enable = true
		},

		-- Grammer-Aware Indentation
		--- TODO: EXPERIMENTAL - CAREFUL!
		--indent = { enable = true },

		textobjects = {
			select = {
				enable = true,
				lookahead = false,
				keymaps = {
					-- You can use the capture groups defined in textobjects.scm
					["af"] = {
						query = "@function.outer",
						desc = "Select [A]round [F]unction",
					},
					["if"] = {
						query = "@function.inner",
						desc = "Select [I]nside [F]unction",
					},
					["al"] = {
						query = "@class.outer",
						desc = "Select [A]round C[L]ass",
					},
					["il"] = {
						query = "@class.outer",
						desc = "Select [I]nside C[L]ass",
					},
					["ac"] = {
						query = "@cell.outer",
						desc = "Select [A]round [C]ell",
					},
					["ic"] = {
						query = "@cell.inner",
						desc = "Select [I]nside [C]ell",
					},
				},
			},
			move = {
				enable = true,
				set_jumps = true,
			}
		},

		-- Always Install Parsers for Languages
		ensure_installed = {
			"ada",
			"arduino",
			"asm",
			"awk",
			"bash",
			"bibtex",
			"c",
			"c_sharp",
			"clojure",
			"cmake",
			"comment",
			"commonlisp",
			"cpp",
			"css",
			"csv",
			"cuda",
			"d",
			"dart",
			"diff",
			"disassembly",
			"dockerfile",
			"dot",
			"doxygen",
			"dtd",
			"editorconfig",
			"eex",
			"elixir",
			"elm",
			"erlang",
			"fennel",
			"fish",
			"forth",
			"fortran",
			"fsh",
			"fsharp",
			"gap",
			"gdscript",
			"gdshader",
			"git_config",
			"git_rebase",
			"gitattributes",
			"gitcommit",
			"gitignore",
			"gleam",
			"glsl",
			"gnuplot",
			"go",
			"gpg",
			"graphql",
			"haskell",
			"hcl",
			"hlsl",
			"hlsplaylist",
			"html",
			"htmldjango",
			"hyprlang",
			"ini",
			"java",
			"javascript",
			"jq",
			"jsdoc",
			"json",
			"json5",
			"jsonc",
			"jsonnet",
			"julia",
			"just",
			"kconfig",
			"kdl",
			"latex",
			"llvm",
			"lua",
			"luadoc",
			"luap",
			"luau",
			"m68k",
			"make",
			"markdown",
			"markdown_inline",
			"matlab",
			"meson",
			"mlir",
			"nasm",
			"nginx",
			"nix",
			"objc",
			"objdump",
			"ocaml",
			"pascal",
			"pem",
			"perl",
			"php",
			"phpdoc",
			"po",
			"pod",
			"powershell",
			"printf",
			"prisma",
			"prolog",
			"promql",
			"proto",
			"puppet",
			"pymanifest",
			"python",
			"qmldir",
			"qmljs",
			"r",
			"readline",
			"regex",
			"requirements",
			"robots",
			"rst",
			"ruby",
			"rust",
			"scala",
			"scss",
			"sflog",
			"smithy",
			"sql",
			"ssh_config",
			"starlark",
			"strace",
			"svelte",
			"swift",
			"t32",
			"tablegen",
			"tcl",
			"teal",
			"terraform",
			"tmux",
			"todotxt",
			"toml",
			"tsv",
			"tsx",
			"turtle",
			"typescript",
			"typespec",
			"typst",
			"udev",
			"unison",
			"usd",
			"vala",
			"verilog",
			"vim",
			"vimdoc",
			"vue",
			"wgsl",
			"wgsl_bevy",
			"xml",
			"xresources",
			"yaml",
			"zathurarc",
			"zig",
		},
	},
	config = function(_, opts)
		require('nvim-treesitter.configs').setup(opts)

		-- Use Treesitter as the Folding Method
		--vim.opt.foldmethod = "expr"
		--vim.opt.foldexpr = "nvim_treesitter#foldexpr()"
	end,
}