dotfiles/.config/nvim/after/ftplugin/tex.lua

-- Author       : swytch
-- Created      : Monday Oct. 04, 2021 16:09:13 CET
-- License      : GPLv3
-- Description  : tex filetype config


local opt           = vim.opt

opt.formatoptions   = "trq1jp"
opt.tabstop         = 4

--  Caps
vim.keymap.set("i", "AA", "À")
vim.keymap.set("i", "CC", "Ç")
vim.keymap.set("i", "EE", "É")

-- Unbreakable spaces
vim.keymap.set("i", "<Space>etc", "\\,etc.")
vim.keymap.set("i", "<Space>:", "\\,:")

-- Snippets
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 copy  = utils.copy

-- 'recursive' dynamic snippet. Expands to some text followed by itself.
local function rec_ls()
	return sn(
		nil,
		c(1, {
			-- Order is important, sn(...) first would cause infinite loop of expansion.
			t(""),
			sn(nil, { t({ "", "", "\t\\item " }), i(1), d(2, rec_ls, {}) }),
		})
	)
end

ls.add_snippets("tex", {
    -- rec_ls is self-referencing. That makes this snippet 'infinite' eg. have as many
    -- \item as necessary by utilizing a choiceNode.
    s("ls", {
        t({ "\\begin{itemize}", "\t\\item " }),
        i(1),
        t({ "" }),
        d(2, rec_ls, {}),
        t({ "", "\\end{itemize}" }),
    }),
    s("lsl", {
        t({ "\\begin{itemize}[label=" }),
        i(1),
        t( { "]", "\t\\item " }),
        i(2),
        t({ "" }),
        d(3, rec_ls, {}),
        t({ "", "\\end{itemize}" }),
    }),
    s("frm", {
        t({ "\\begin{" }),
        i(1),
        t({ "}[" }),
        i(2),
        t({ "]{" }),
        f(copy, 1),
        t({ ":" }),
        i(3, "foo"),
        t({ "}", "\t" }),
        i(0),
        t({ "", "\\end{" }),
        f(copy, 1),
        t({ "}" }),
    }),
    s("env", {
        t({ "\\begin{" }),
        i(1, "foo"),
        t({ "}", "\t" }),
        i(2),
        t({ "", "\\end{" }),
        f(copy,1),
        t({ "}"}),
    }),
    s("tikz", {
        t({ "\\begin{center}" }),
        t({ "", "\t\\begin{tikzpicture}[main/.style = {draw,circle}]", "\t\t" }),
        i(1),
        t({ "", "\t\\end{tikzpicture}", "\\end{center}" }),
    }),
    s("ra", { t( "\\rightarrow" )}),
    s("Ra", { t("\\Rightarrow" )}),
    s("la", { t("\\leftarrow" )}),
    s("La", { t("\\Leftarrow" )}),
    s("lra", { t("\\leftrightarrow" )}),
    s("Lra", { t("\\Leftrightarrow" )}),
    s("bb", {
        t({ "\\textbf{" }),
            i(1),
            t({ "}"}),
    }),
    s("tt", {
        t({ "\\texttt{" }),
        i(1),
        t({ "}"}),
    }),
    s("ii", {
        t({ "\\textit{" }),
        i(1),
        t({ "}"}),
    }),
    s("uu", {
        t({ "\\underline{" }),
        i(1),
        t({ "}"}),
    }),
    s("fsc", {
        t({ "\\textsc{" }),
        i(1),
        t({ "}"}),
    }),
}, {
    key = "tex"
})