nixos-configs/homeManagerModules/neovim/langs/markdown/default.nix

self: {
  config,
  lib,
  osConfig,
  pkgs,
  self,
  ...
}: let
  inherit (self.inputs) vimplugin-easytables-src;
  inherit (self.lib.${pkgs.system}) buildPlugin;

  inherit (lib) concatStringsSep mkIf;

  cfg = config.programs.neovim;
  flakeEnv = config.programs.bash.sessionVariables.FLAKE;
  isServer = osConfig.roles.server.sshd.enable or false;

  githubCSS = pkgs.fetchurl {
    url = "https://raw.githubusercontent.com/OzakIOne/markdown-github-dark/5bd0bcf3ad20cf9f58591f97a597fd68fc699f8e/style.css";
    hash = "sha256-deQvQOOyK6iP7kjVrgEdFTyOP80RWXMrETs6gi7DTmo=";
  };
in {
  config = mkIf cfg.enable {
    programs = {
      neovim = {
        extraLuaConfig =
          # lua
          ''
            vim.api.nvim_create_autocmd('FileType', {
                pattern = { 'markdown', 'tex' },

                callback = function()
                    vim.cmd[[setlocal ts=4 sw=4 sts=0 expandtab]];

                    if (devShells['markdown'] == nil) then
                        devShells['markdown'] = 1;

                        require('nix-develop').nix_develop({'${flakeEnv}#markdown'});
                        vim.cmd[[LspStart]];
                    end
                end,
            });

            local lsp = require('lspconfig');

            lsp.texlab.setup({
                capabilities = require('cmp_nvim_lsp').default_capabilities(),
                autostart = false,

                settings = {
                    texlab = {
                        formatterLineLength = 100,
                        latexFormatter = 'latexindent',
                        latexindent = {
                            modifyLineBreaks = false,
                            ["local"] = '.indentconfig.yaml';
                        },
                    },
                },
            });
          '';

        plugins = [
          {
            plugin = buildPlugin "easytables-nvim" vimplugin-easytables-src;
            type = "lua";
            config =
              # lua
              ''
                require('easytables').setup();
              '';
          }

          {
            plugin = pkgs.vimPlugins.knap;
            type = "lua";
            config = let
              mdToPDF = "pandoc --css ${githubCSS} %docroot% -o /tmp/%outputfile%";
              mdToPDFViewer = "sioyek /tmp/%outputfile%";

              mdToHTML = "pandoc --standalone --embed-resource --highlight-style=breezedark --css ${githubCSS} %docroot% -o /tmp/%outputfile%";
              mdToHTMLViewer =
                if isServer
                then
                  concatStringsSep " " [
                    "${pkgs.nodePackages.live-server}/bin/live-server"
                    "--host=0.0.0.0"
                    "--port=6565"
                    "--quiet"
                    "--no-browser"
                    "--watch=%outputfile%"
                    "--entry-file=%outputfile%"
                    "--wait=800"
                    "/tmp"
                  ]
                else "firefox -new-window /tmp/%outputfile%";
            in
              # lua
              ''
                vim.g.knap_settings = {
                    -- HTML
                    htmloutputext = 'html',
                    htmltohtml = 'none',
                    htmltohtmlviewerlaunch = "",
                    htmltohtmlviewerrefresh = 'none',

                    -- Markdown
                    mdoutputext = 'html',
                    markdownoutputext = 'html',

                    -- Markdown to PDF
                    mdtopdf = '${mdToPDF}',
                    markdowntopdf = '${mdToPDF}',
                    mdtopdfviewerlaunch = '${mdToPDFViewer}',
                    markdowntopdfviewerlaunch = '${mdToPDFViewer}',
                    mdtopdfviewerrefresh = 'none',
                    markdowntopdfviewerrefresh = 'none',

                    -- Markdown to HTML
                    mdtohtml = '${mdToHTML}',
                    markdowntohtml = '${mdToHTML}',
                    mdtohtmlviewerlaunch = '${mdToHTMLViewer}',
                    markdowntohtmlviewerlaunch = '${mdToHTMLViewer}',
                    mdtohtmlviewerrefresh = 'none',
                    markdowntohtmlviewerrefresh = 'none',

                    -- LaTeX
                    -- TODO: stop from polluting workspace
                };

                vim.api.nvim_create_autocmd('BufUnload', {
                    pattern = '*',
                    callback = function()
                        os.execute("killall -qr live-server");
                    end,
                });

                -- F4 processes the document once, and refreshes the view
                vim.keymap.set({ 'n', 'v', 'i' }, '<F4>', function()
                    require('knap').process_once();
                end);

                -- F5 closes the viewer application, and
                -- allows settings to be reset
                vim.keymap.set({ 'n', 'v', 'i' }, '<F5>', function()
                    require('knap').close_viewer();
                end);

                -- F6 toggles the auto-processing on and off
                vim.keymap.set({ 'n', 'v', 'i' }, '<F6>', function()
                    require('knap').toggle_autopreviewing();
                end);

                -- F7 invokes a SyncTeX forward search, or similar,
                -- where appropriate
                vim.keymap.set({ 'n', 'v', 'i' }, '<F7>', function()
                    require('knap').forward_jump();
                end);
              '';
          }
        ];
      };
    };
  };

  # For accurate stack trace
  _file = ./default.nix;
}