treewide: begin restructuring the module tree

modules/plugins/languages/sql.nix

@@ -0,0 +1,166 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}: let
+  inherit (builtins) attrNames;
+  inherit (lib.options) mkEnableOption mkOption;
+  inherit (lib.modules) mkIf mkMerge;
+  inherit (lib.lists) isList;
+  inherit (lib.types) enum either listOf package str;
+  inherit (lib.nvim.lua) expToLua;
+  inherit (lib.nvim.languages) diagnosticsToLua;
+  inherit (lib.nvim.types) diagnostics;
+
+  cfg = config.vim.languages.sql;
+  sqlfluffDefault = pkgs.sqlfluff;
+
+  defaultServer = "sqls";
+  servers = {
+    sqls = {
+      package = pkgs.sqls;
+      lspConfig = ''
+        lspconfig.sqls.setup {
+          on_attach = function(client)
+            client.server_capabilities.execute_command = true
+            on_attach_keymaps(client, bufnr)
+            require'sqls'.setup{}
+          end,
+          cmd = ${
+          if isList cfg.lsp.package
+          then expToLua cfg.lsp.package
+          else ''{ "${cfg.lsp.package}/bin/sqls", "-config", string.format("%s/config.yml", vim.fn.getcwd()) }''
+        }
+        }
+      '';
+    };
+  };
+
+  defaultFormat = "sqlfluff";
+  formats = {
+    sqlfluff = {
+      package = sqlfluffDefault;
+      nullConfig = ''
+        table.insert(
+          ls_sources,
+          null_ls.builtins.formatting.sqlfluff.with({
+            command = "${cfg.format.package}/bin/sqlfluff",
+            extra_args = {"--dialect", "${cfg.dialect}"}
+          })
+        )
+      '';
+    };
+  };
+
+  defaultDiagnosticsProvider = ["sqlfluff"];
+  diagnosticsProviders = {
+    sqlfluff = {
+      package = sqlfluffDefault;
+      nullConfig = pkg: ''
+        table.insert(
+          ls_sources,
+          null_ls.builtins.diagnostics.sqlfluff.with({
+            command = "${pkg}/bin/sqlfluff",
+            extra_args = {"--dialect", "${cfg.dialect}"}
+          })
+        )
+      '';
+    };
+  };
+in {
+  options.vim.languages.sql = {
+    enable = mkEnableOption "SQL language support";
+
+    dialect = mkOption {
+      description = "SQL dialect for sqlfluff (if used)";
+      type = str;
+      default = "ansi";
+    };
+
+    treesitter = {
+      enable = mkEnableOption "SQL treesitter" // {default = config.vim.languages.enableTreesitter;};
+
+      package = mkOption {
+        description = "SQL treesitter grammar to use";
+        type = package;
+        default = pkgs.vimPlugins.nvim-treesitter.builtGrammars.sql;
+      };
+    };
+
+    lsp = {
+      enable = mkEnableOption "SQL LSP support" // {default = config.vim.languages.enableLSP;};
+
+      server = mkOption {
+        description = "SQL LSP server to use";
+        type = enum (attrNames servers);
+        default = defaultServer;
+      };
+
+      package = mkOption {
+        description = "SQL LSP server package, or the command to run as a list of strings";
+        example = ''[lib.getExe pkgs.jdt-language-server "-data" "~/.cache/jdtls/workspace"]'';
+        type = either package (listOf str);
+        default = servers.${cfg.lsp.server}.package;
+      };
+    };
+
+    format = {
+      enable = mkEnableOption "SQL formatting" // {default = config.vim.languages.enableFormat;};
+
+      type = mkOption {
+        description = "SQL formatter to use";
+        type = enum (attrNames formats);
+        default = defaultFormat;
+      };
+
+      package = mkOption {
+        description = "SQL formatter package";
+        type = package;
+        default = formats.${cfg.format.type}.package;
+      };
+    };
+
+    extraDiagnostics = {
+      enable = mkEnableOption "extra SQL diagnostics" // {default = config.vim.languages.enableExtraDiagnostics;};
+
+      types = diagnostics {
+        langDesc = "SQL";
+        inherit diagnosticsProviders;
+        inherit defaultDiagnosticsProvider;
+      };
+    };
+  };
+
+  config = mkIf cfg.enable (mkMerge [
+    (mkIf cfg.treesitter.enable {
+      vim.treesitter.enable = true;
+      vim.treesitter.grammars = [cfg.treesitter.package];
+    })
+
+    (mkIf cfg.lsp.enable {
+      vim = {
+        startPlugins = ["sqls-nvim"];
+
+        lsp.lspconfig = {
+          enable = true;
+          sources.sql-lsp = servers.${cfg.lsp.server}.lspConfig;
+        };
+      };
+    })
+
+    (mkIf cfg.format.enable {
+      vim.lsp.null-ls.enable = true;
+      vim.lsp.null-ls.sources."sql-format" = formats.${cfg.format.type}.nullConfig;
+    })
+
+    (mkIf cfg.extraDiagnostics.enable {
+      vim.lsp.null-ls.enable = true;
+      vim.lsp.null-ls.sources = diagnosticsToLua {
+        lang = "sql";
+        config = cfg.extraDiagnostics.types;
+        inherit diagnosticsProviders;
+      };
+    })
+  ]);
+}