nvf/modules/plugins/languages/html.nix

{
  config,
  pkgs,
  lib,
  ...
}: let
  inherit (builtins) attrNames;
  inherit (lib.meta) getExe;
  inherit (lib.options) literalExpression mkEnableOption mkOption;
  inherit (lib.modules) mkIf mkMerge;
  inherit (lib.types) bool enum listOf;
  inherit (lib) genAttrs;
  inherit (lib.lists) optional;
  inherit (lib.nvim.types) mkGrammarOption diagnostics deprecatedSingleOrListOf;
  inherit (lib.nvim.dag) entryAnywhere;
  inherit (lib.nvim.attrsets) mapListToAttrs;

  cfg = config.vim.languages.html;

  defaultServers = ["superhtml"];
  servers = ["superhtml" "emmet-ls"];

  defaultFormat = ["superhtml"];
  formats = {
    superhtml = {
      command = "${pkgs.superhtml}/bin/superhtml";
      args = ["fmt" "-"];
    };
  };

  defaultDiagnosticsProvider = ["htmlhint"];
  diagnosticsProviders = {
    htmlhint = {
      config.cmd = getExe pkgs.htmlhint;
    };
  };
in {
  options.vim.languages.html = {
    enable = mkEnableOption "HTML language support";
    treesitter = {
      enable =
        mkEnableOption "HTML treesitter support"
        // {
          default = config.vim.languages.enableTreesitter;
          defaultText = literalExpression "config.vim.languages.enableTreesitter";
        };
      package = mkGrammarOption pkgs "html";
      autotagHtml = mkOption {
        type = bool;
        default = true;
        description = "Enable autoclose/autorename of html tags (nvim-ts-autotag)";
      };
    };

    lsp = {
      enable =
        mkEnableOption "HTML LSP support"
        // {
          default = config.vim.lsp.enable;
          defaultText = literalExpression "config.vim.lsp.enable";
        };
      servers = mkOption {
        type = listOf (enum servers);
        default = defaultServers;
        description = "HTML LSP server to use";
      };
    };

    format = {
      enable =
        mkEnableOption "HTML formatting"
        // {
          default = config.vim.languages.enableFormat;
          defaultText = literalExpression "config.vim.languages.enableFormat";
        };

      type = mkOption {
        type = deprecatedSingleOrListOf "vim.language.html.format.type" (enum (attrNames formats));
        default = defaultFormat;
        description = "HTML formatter to use";
      };
    };

    extraDiagnostics = {
      enable =
        mkEnableOption "extra HTML diagnostics"
        // {
          default = config.vim.languages.enableExtraDiagnostics;
          defaultText = literalExpression "config.vim.languages.enableExtraDiagnostics";
        };

      types = diagnostics {
        langDesc = "HTML";
        inherit diagnosticsProviders;
        inherit defaultDiagnosticsProvider;
      };
    };
  };

  config = mkIf cfg.enable (mkMerge [
    (mkIf cfg.treesitter.enable {
      vim = {
        startPlugins = optional cfg.treesitter.autotagHtml "nvim-ts-autotag";

        treesitter = {
          enable = true;
          grammars = [cfg.treesitter.package];
        };

        pluginRC.html-autotag = mkIf cfg.treesitter.autotagHtml (entryAnywhere ''
          require('nvim-ts-autotag').setup()
        '');
      };
    })

    (mkIf cfg.lsp.enable {
      vim.lsp = {
        presets = genAttrs cfg.lsp.servers (_: {enable = true;});
        servers = genAttrs cfg.lsp.servers (_: {
          filetypes = ["html" "shtml" "xhtml" "htm"];
        });
      };
    })

    (mkIf (cfg.format.enable && !cfg.lsp.enable) {
      vim.formatter.conform-nvim = {
        enable = true;
        setupOpts = {
          formatters_by_ft.html = cfg.format.type;
          formatters =
            mapListToAttrs (name: {
              inherit name;
              value = formats.${name};
            })
            cfg.format.type;
        };
      };
    })

    (mkIf cfg.extraDiagnostics.enable {
      vim.diagnostics.nvim-lint = {
        enable = true;
        linters_by_ft.html = cfg.extraDiagnostics.types;
        linters = mkMerge (map (name: {
            ${name} = diagnosticsProviders.${name}.config;
          })
          cfg.extraDiagnostics.types);
      };
    })
  ]);
}